CNC Project: FS4MG - "Not a Kern"

[@glamenz]

Hallo Stefan. I will continue in English for the broader audience. Nice to see you upgrading your shop. I don't want to be that guy, but please don’t encourage people to use the Erowa zero clamp system on a lathe. We use this and a different system quite extensively at my workplace. You can do at your shop whatever you want, but systems like this one are forbitten to be used at the lathe by the workers' compensation board (Berufsgenossenschaft). There are special versions of it that can be used, but the normal version can kill you if you, if the clamping mechanism becomes undone while it rotates

[@StefanGotteswinter]

Interesting! Thanks for the heads up - I guess the screw version, that does not use the drawbolt is fine for lathe use?

[@glamenz]

@@StefanGotteswinter yes that solves the main problem. When you talk with the manufacturer they are super cautious, when you tell them you want to use their products on a lathe. But there is more, if you want to put a vice in the erowa chuck, it has to be a vice without weak points in the spindel, centrifugal forces can get you. I used some funky setups myself, but if the trainees look above my shoulder i tell them that if they want to do stuff like that, they have to be super cautious about rotation speed and cutting forces

[@Brit_Toolmaker]

@@glamenz Thank you this is interesting reading. At work we use System 3R Macro & their original hydraulic Mini series across all of our machines. From what I know the 3R Macro pallet system is much more rigid compared to the Erowa system with similar repeatability. For CNC lathe & cylindrical grinding machining, we mainly use the hydraulic Mini series without any problem, and the same can be said for the occasional times we use the 3R spindle recommended Macro chuck 3R-600.22 for bigger parts, staying within the recommended electrode size range. We've never had any issues regarding security of workholding on any machine, including some very heavy machining on our VMC machines, if you compare the two systems the 3R pallets are incredibly strong as they are based on the indexing system used on Ward capstan turret lathes for indexing the turret.

[@Michel-Uphoff]

"Just like some people, it is just a hollow shell" 🤣 Love that kind of humor. Exiting project Stefan!

[@Jonas_Keunecke]

LOL, I had to get up from my seat for a few seconds after that one, that came unexpected

[@MachiningandMicrowaves]

Very neat chuck system for proto/dev work and short-run manufacturing. I like the possibility of having a chuck on the lathe and on a CNC mill to move parts between machines with no loss of precision. I use a collet chuck to do that with microwave antenna feed parts, using a dummy D1-4 spindle nose on the mill. It's very repeatable in X/Y/Z but it's not so precise in rotation.

[@StefanGotteswinter]

i truely want a chuck for the lathe, yeah :-D That would be awesome to run back and forth, if only for parting off finished parts.

[@wolfitirol8347]

I use the same system a D1 4 camlock chuck which fits on lathe and mill whenever I opened the chuck precision was gone so I came up with this and bought my new lathe with D1 4... original Chucks are quite expensive but if you are able to make your own backplate it's cheap and precise....well I talk easy now I needed 4 bad backplates until my first was like I wanted her with 0,02 runout 25mm before the chuck is always the minimum that I accept 🫣

[@first_namelast_name4923]

I am looking forward to seeing you building that small CNC mill. Thank you for yet another great video.

[@tonywilson4713]

*FOR EVERONE WONDERING ABOUT DRAG CHAIN CABLE.* In an earlier part of my engineering career when I was doing custom built production cells. I did projects where we built gantry robots and where we used 6 axis robots. There are 2 distinct kinds of cable you will find in catalogues from companies like Lapp, Belden and Olex - trailing and robotic and yes there is a difference. FIRST a basic lesson in copper cable. Typically electrical cables are made from strands of copper wire but you also get aluminum and gold for some applications. For all those who have watched Blondihacks series on copper boilers you'd know that copper *work hardens.* The difference between good quality electrical cable and poor cable is the quality of the annealing after the wire is drawn AND YES there's a big difference between manufactures. The main difference between cables for fixed applications and flexing applications are the number of strands and how the cores are encased in the plastic sheath. Fixed wiring has thicker strands and is simply encased in the plastic. Trailing and Robotic cables are made from much finer strands and they are installed with a dry powder lubricant so that the strands and cores can slide over each other. You'll see that lubricant when you strip the cables. Some of the higher performance multicore cables also have cloth sheaths between the cores and the outer plastic sheath. If the cable is shielded they have to do the same with the shielding in that its made from much finer strands. *- ROBOT cable* is the cable specifically designed for 6 axis (and similar) robotic applications where the cable doesn't just flex back and forth but also *TWISTS.* If you think about welding robots and spot welding robots they flex and twist in all sorts of ways. The standing, sheath and construction is all done for continuous flexing in ANY DIRECTION. This is why it costs a lot of money per meter but in things like welding applications its an absolute must if you want to avoid heartbreak. *- TRAILING cable* is what is used for drag chains. In most catalogues you won't see titles or descriptions or categories saying "drag chain cable" you'll see "trailing cable" and in the description you'll see "suitable for drag chains." Despite the label trailing cable is specifically designed for things like drag chains. It can be used for twisting applications but its main use is in drag chains going backwards and forwards. A COUPLE OF KEY POINTS A critical thing to look for is the minimum radius of the drag chain and the minimum radius for the cable. You should always pick a combination where the minimum radius of the cable is LESS THAN the minimum radius of the drag chain. Otherwise the cable will be stressed by the chain as it runs back and forth. The main aim of these systems is to NOT stress the cable or you will work harden the copper and it will eventually fail. When installing cable in a drag chain a major mistake is to use cable ties to clamp the cable to the chain DON'T DO THIS the idea is to let the cable flex. Most drag chain supplies have clamps for the end of the chain if required but typically you'll only clamp at one end so that the cable is free to flex. Most drag chains also have separators to keep cables from rubbing against each other - USE THEM. If you have communications, encoders and/or sensors don't simply throw the cables in the chain next to the motor power cables. I typically had AC servos with either encoders or resolvers so we had BOTH power and sensor cables. Its best practice to keep them as far apart as possible. Most of you will have power cables for stepper motors not AC Servos but don't forget that stepper motors are notoriously noisy by the nature of what they are. So its still sound practice to keep the power cables separate from the sensor cables. If you have a chain without separators use the air lines to separate the power cables from the sensor cables. So for all of you with these cartesian type machining centres you only need trailing cable but you do need to install it properly if you want it to last. FINAL POINT ON MOTOR CABLES WITH PLUG CONNECTIONS In this vid you'll see that Stefan bought a factory made cable for the spindle motor. For these sorts of motors with multi-pin cannon connectors or mil-spec connectors I ALWAYS RECOMMEND BUYING A MOTOR CABLE FROM THE MOTOR SUPPLIER. I have done a lot of work with such connectors over the years and they are fantastic when you have the right crimping tools or high quality soldering equipment but they are a nightmare when you don't. Stefan says his spindle cost €3,500. You don't want to risk that on a dodgy cable where its 100% your responsibility. I have never had a factory supplied motor cable fail but have seen what happens when cheaper options fail. Even if you are that 1 in 10,000 who gets that factory cable that fails there's things called warranties and customer support.

[@StefanGotteswinter]

Excellent breakdown!

[@tonywilson4713]

@@StefanGotteswinter Thanks. I like the fact I heard Lapp Cable at one point. They are one of those suppliers I always have on the list for a project. Its never the cheapest but I KNOW that it will do what the specification says. If there is another thing I would advise everyone in automation projects. USE 12mm barrel type proximity sensors with an M12 Plug connection whenever you can. 1) The M12 connection is a standard pin pattern so all of the variations from various manufacturers are interchangeable. All you ever have to worry about is the sensing range of the replacement. 2) These sensors have a 12x1 thread and its easy to get a tap so you can thread them into the bodies of things and just use 1 of the supplied nuts as the locking nut. Yes you end up with a collection of M12x1 nuts but then the talking monkeys like to lose them. So having spares is wise. The fine 1mm thread means if you rotate the sensor 1 turn you also know the end of the sensor has moved 1mm. 3) At 12mm diameter the 1/2inch (12.54mm) Pilot point drill from Dewalt cuts a perfect hole in aluminum and most sensor brackets are made from Aluminum. 4) On the maintenance side if the sensor gets "wacked" its a lot easier to replace the sensor and plug the lead on than replace the sensor an wire it in. Wait until you have to replace a sensor with a plug connection and you will never go back. Also the 7/16 (11.1mm) Pilot point drill makes a near perfect hole for the M12x1 tap. The one exception I have for that are sensors for hazardous areas I typically use 18mm sensors with a lead for that stuff. The reason is when you have a site with mixed standard and hazardous applications is less likely that a maintenance guy will put the wrong sensor in the wrong place.

[@ROBRENZ]

Looking good Stefan, cant wait to seeing more! ATB, Robin

[@henrikskott]

We all have the "I need another project like I need a hole in the head" problem, but it doesn't make us reject enough projects to make the list shrink anyway. I'll probably die with a list longer than my leg of projects 'needing' (for a given value of 'need') to be completed. Very nice project, that You didn't need. :)

[@wolfitirol8347]

The last years i used a small optimum metall mill converted with 4 closed loop motors 12.5Nm for milling nice small metall parts ( stefan helped me once while converting with an answer in a forum😊) and was quite satisfied so far but seeing Stefans project i think about buying a bigger frame and doing the same as he did. A friend with his router always comes to me machining when the material is harder than normal aluminium... the Optimum mill has no problems with steel of different kinds there is controlled cooling mimimal and normal also controlled by the cnc controller as the spindle speed...the parts are very close to spec and for my use more than exact enough 😊thanks to the closed loop system which is nothing else than a servo....

[@AttilaAsztalos]

Was it a BF20 perchance...? Some time ago at work we used to have a manual one purchased together with a CNC conversion kit, albeit an open loop one - it was a nice machine that served our fairly modest needs quite well...

[@vincei4252]

Stefan, it's really weird to me seeing you use a tape measure as opposed to a micrometer Great project and inspirational as always! Congrats on the new machine too.

[@first_namelast_name4923]

What tape measure? I saw a wooden folding ... thing ... that carpenters use when they need to measure things with plus/minus 5 mm tolerance ;-)

[@vincei4252]

@@first_namelast_name4923 3:15

[@dieSpinnt]

@@first_namelast_name4923 See 3:23 adjusting the cross section of the table parallel, before welding. Edit: Vince is clearly joking. This and maybe a try square are the appropriate tools. The tolerance requirements(important dimensions) were guaranteed by the following clamping. As seen in the video[tm]. BTW: Oh you can't work precise down to a tenth of a mm with such a "wooden folding"? You Heretic! Hehehe. Have a nice day, strange nickname!:)

[@StefanGotteswinter]

Tape measure and wooden folding rules have helped me build many many machines in my professional career :)

[@Joelsfilmer]

@@StefanGotteswinter Look up the contact-meter variant. It might blow your mind a little bit.

[@ModdingMonkey]

Thank you for this treat, perfect video to relax on this afternoon after doing the theoretical part of my journeyman exam this morning, i hold you parcially responsible for giving me the itch to become a machinist (Feinwerkmechaniker Fachrichtung Maschinenbau) myself and could not be happier with my choice after doing my apprenticeship time over the last few years. I also want to thank you for sharing all your knowledge so freely, i have picked up lots of little things from you that helped me greatly in the workshop and hopefully will too in my practical exams 2 weeks from now.

[@wolfitirol8347]

I think Stefan has no idea how many hobby and professionals were inspired by him ...whenever I had a down and was at a dead point his vids cheered me up and demonstrated to me there is a way to do it with pleasure and good results. The things I learned from him are so many I couldn't mention it all.... scrapping, milling , dbit grinder and thousand other things I took advantage having a guy who made it how it should be done , so I just tried to copy him 🌞😂 with most times good results...

[@jamesmorrison4713]

The title “Not a Kern” attracted me to this video. I found it extremely interesting and informative. 😊

[@RUNCNC]

Thank you for sharing the spindle specs and measurement!

[@Arthur-ue5vz]

Thank you Stefan! I can hardly wait to see you machining some stuff with this "new to you" machine! 😊

[@StefanGotteswinter]

I cant wait either :D

[@ahmedalshalchi]

Stefan , you are amazing ... I loved your handcrafting , Made-in-Germany ! ...

[@jacquesmuller4356]

Stefan, truly appreciate your honest options, fit for purpose is something not a lot of people can understand

[@philbert006]

That its chuck and pallet system is pretty clever. The post and ball bearing locking mechanism to me inspires confidence that it will be both accurate and durable as well as repeatable. A very nice looking piece. Look forward to seeing it perform in the near future!

[@NerdlyCNC]

This style of "Bridge Mill" is BY FAR the best design in my opinion. Our Okuma M560 is so much more rigid than any C-Frame mill i've owned

[@dan4653]

I thought about building a similar mill. Glad to know I was on the right track! Can't wait to see how it turns out!

[@heinzhaupthaar5590]

Great choice! It's more a lost mould or stressed skin kind of deal than a filled steel frame, and I'm not entirely sure but I think I remember Thomas, one of the manufacturers, told me a few years ago the steel skin isn't very significant for the machines stiffness/stability. Might've just imagined that though, but it's definitely not a filled steel frame kind of deal. The larger ones, FS3MG, rely solely on epoxy granite though and are made in reusable moulds.

[@joansparky4439]

I can highly recommend those carbide cold saws with ~350mm saw blades.. I got one 2 years ago and I will never go back to cutting stock with a grinder or similar machines. And yeah, I'm also not set up to fab.. except I use those economical 120kg WLL aluminium trestles/platforms as welding-"table" ;-)

[@drevil8519]

Stefan. That hollow 3d comment was classic😁👍😁👍😁👍

[@glennstasse5698]

Wow. Getting the basic frame is just the beginning! Work holding, tool holding, electronic gear and much work await. Plus, of course, a few Euros thrown in. An economist would call this capital investment. I don’t know what you’d call it when a hobbyist does it. But this is not a hobbyist on display here! It’s also interesting how people progress to increasingly precise machines. I’ve watched people get small motorcycles and progress to monster speedsters. It all seems like a natural progression. Good luck, Stephan.

[@whittysworkshop982]

Anyone else shocked that Stefan whipped out a folding rule to measure 🤔 I didn't think the most precise man I've ever seen would own such a tool; that's for the likes of us dead tree carcass butchers 😂 I love watchin you work and talk through your process Stefan 😁

[@StefanGotteswinter]

I love folding rules :D

[@wmc7870]

​@@StefanGotteswintera mandatory bottle opener...

[@toddcumberland132]

UGH. Not only do I have to put up with your amazing machines, your exemplary craftmanship, but now I have to deal with the fact that cool stuff just rains down on you. :) I look forward to this.

[@caseytailfly]

I laughed when you said that was a torque wrench tightening the tool holder, then I realized it really is, and now I really want one!

[@StefanGotteswinter]

Hoffmann Group, Nr. 211750 They come in fixed torque values - I have them also on the lathe for changing inserts and torquing them correctly :)

[@garychaplin9861]

Great video. Thanks for the concise description of the equipment, I look forward to seeing the build and operation.

[@youpattube1]

You may have mixed feelings about another project, but it looks interesting to me and I am enjoying it already.

[@dougankrum3328]

I'm only 5 minutes into your video, but I wish to say that I've used all sorts of welding processes and the SMAW (stick) is a fairly high skilled process...with the right type of filler rods, and just a bit of 'finishing' you can build quite a nice table/frame...and it's not very expensive. And some feed-back on those stepper drive...Sweet....I used to be electronic tech on the first CNC stuff, DC motor drives the ball-screw, 2,000 RPM...and 3-phase decoder for positioning....0001" back in 1997...Some of the first Mazak controls...and some Fanuc...

[@drevil8519]

I was waiting for Stefan to dial in the cross member of that stand. 😁

[@first_namelast_name4923]

This morning I opened KZbin main page to watch some videos about possible civil war in Russia. But, geopolitical catastrophe will have to wait 43 minutes because Stefan has a new video and THAT one has has priority over anything else. Including work and chores ;-).

[@darwinboor1300]

16:10 Your first measurement should be: Are gantry rails parallel to build plate and linear? I see they are attached with screws that could produce a center bow if not tightened correctly.

[@SimonPEdwards63]

You had me with the title, Kern is visiting us in two weeks, presumably to try to sell us a Micro HD.

[@jfl-mw8rp]

Sefan with a tape measure is like DaVinci using a house painters brush. Lol. Love your work! 😂

[@StefanGotteswinter]

Tape measure and folding rule are super common tools in special machine building and basicaly every day carry at my dayjob. Its just you never see my full persona on youtube, just the boiled down stuff :)

[@mxlje]

That mounting system looks amazing! Congrats on getting that and have fun using it 🎉

[@cschwad559]

I don’t know why stick welding is si doggone hard, but I have the same problem, Stefan. Tig welding is always my favorite.

[@kylewarren69]

I have some catching up to do on my mill, my hiwin rails should be coming soon though so I can start getting closer.

[@StefanGotteswinter]

If you dont do a video on it, I will get mad at you. (I will not get mad, but a video would be nice. And if its only lifting components, fine :D)

[@wizrom3046]

Fantastic small CNC machine frame! I remember about 12 or so years back on the CNC forum when the German guys were designing that epoxy franite frame and starting to make them. From memory it is not a welded structure filled with EG but instead is an EG structural casting with some steel plates fixtured at critical places. It will make a very pro setup for your small part machining needs! 👍🙂

[@heinzhaupthaar5590]

That's the larger model, the FS3MG. The small one, FS4MG, is a lost mould / stressed skin kind of thing, cast directly into a thin welded shell. The precision surfaces are all moulded with a very precise master template using a diamant polymer DWH or some similar "machine tool grout" epoxy stuff. Seems to be the better way to do things like that, though it might feel a bit counter intuitive. Iirc Thomas told me the skin isn't very significant for the FS4MG's stiffness/stability when I had the idea to use a thin shell to deal with tension loads, but I'm not completely sure about that. Been quite a while.

[@wizrom3046]

@@heinzhaupthaar5590 .. thank you very much for the info. 👍 With such a great starting frame and Stefan's brilliant engineering I cant wait to see how it turns out!

[@mystamo]

100K subs coming in soon Stefan. What a journey it has been.. Finally have a nice CNC!

[@TheUncleRuckus]

Congrats on your new acquisition Stefan! That little chuck is really cool, excited to see how you incorporate it into your work, thank you for uploading. 👍👍

[@chronokoks]

Alot of ac servo manufacturers use molex actually. It's the electricians job to mount the cables in a way they will survive. But yes, automation brands mostly use high quality metal round connectors.

[@StefanGotteswinter]

Yeah, I am familiar with the Festo Servos which have nice round screw on connectors :)

[@crabmansteve6844]

3M Cubitron is good enough for just about anything. Seriously one of my favorite abrasive families. Between my "projects" and my Steam library it is truly a miracle I get anything done some weeks.

[@StefanGotteswinter]

The Cubitron cut off wheels are also magic on the t&c grinder to slice highspeed steel. Steam libary? Have you tried factorio? :D

[@carlhitchon1009]

It's like Christmas. Looking forward to operation.

[@garysgarage101]

I love you’re new machine. I’ve been struggling on how to get a small CNC machine into my shop for some while. Unfortunately there are no obvious solutions in North America aside from CNC routers. Great setup.

[@geraldgepes]

Stefan, long time no see. I've been going down a bit of a micro-CNC rabbit hole lately myself and am looking for inspiration. Interestingly, I've spent years wanting to buy a Hörger & Gaßler mag base myself. But being in the US, ordering one from Hoffmann or the likes would set me back a small fortune as I tend to need a larger one for my day job. So, when a 440 model popped up on Ebay for $129, I jumped at it and it just arrived today. I've spent the past 5 or so years feeling a bit silly mounting a one or two micron indicator to an amazon mag base but, no more!

[@TinkerTomUK]

Maybe it’s just me but I love over engineering stuff thin sheet metal doesn’t sit well with me a thick heavy duty grey cast iron skeleton with the epoxy granite surrounding it would provide far greater stiffness and it will use less resin too. I guess if you don’t have a high temp furnace and plenty of disc rotors kicking around you could use aluminium.

[@DrewLSsix]

What do you have to support that assertion? FEA ? Have you experimented with both options? Any data at all? This option is actually almost certainly superior, for the same reason composite structures are made this way. The shell is supported in its weak axis and lends it's high tensile strength to the structure, placing the EG on the outside means that you are asking the rigid brittle element to take the tensile load, and the cast iron skeleton isn't really doing anything.

[@charlieromeo7663]

This project will be fun to watch.

[@MarkW321]

Nice project good luck with it. What brand of taps do you like? I have been using OSG taps they work great.

[@StefanGotteswinter]

All Garant Mastertap these days. I have a mix of Gühring/Garant and Holex, the Garant perform the best, especially on small diameter taps in tough materials.

[@mitakuuluu]

Mill scale pain? Try this: Storage tray with lid. Soak parts overnight in neat strong vinegar. Wrapping big parts in vinegar soaked rags in a plastic bag also works. Yeah, I was sceptical till I tried it

[@wgn567]

Great video again Stefan. One small remark from my own electronics background knowledge, better not to put the unshielded motor powercables next to the unshielded data control cables in one box. They could interfere with eachother. And hard ground all metal parts of the machine with its own earth cable (preferred 4mm2 or bigger) also the metal box. Looking forward on the next video showing the results and obtainable precision with this new cnc machine.

[@NourMuhammad]

Hello, Is it possible to share the CAD model of your machine, it would be very nice, thanks

[@jasonh3109]

Fun build! Those ITS chucks look amazing.

[@DavidM2002]

Instead of epoxy granite, would very small lead shot not work just as well ? And it would be removable. Or, melt and pour it in ? Or is that too simplistic and I'm missing something ?

[@angelramos-2005]

Great video,Stefan and very precise and quality machine.Thank you.

[@bcbloc02]

That chuck pallet system is very interesting.

[@tommelomme6761]

I bet we soon have a video making those palette! Nice!

[@davidmott2090]

A grinder and some paint will make a welder what he aint.

[@Hoaxer51]

Another great Red Green saying! Gotta love those Canadians, Keep your stick on the ice!

[@StanErvin-yo9vl]

​@@Hoaxer51 Looks like we have a subscriber to uncle Bumble! Eh, eh? 🖐️🤏ԅ⁠(⁠ ͒⁠ ⁠۝ ͒⁠ ⁠)⁠ᕤ Just the tip.

[@Cancun771]

Cute! ThisOldTony will be green with jealöusy.

[@1ginner1]

Hi Stefan, that's a really nice clamping system. Looking forward to seeing how you align the spindle.

[@FinnoUgricMachining]

Nice and informative video. Stick welding a thin metal tube is nothing but easy. I always succeed in making some extra holes and then the weld tends to stick to only to the other part to be welded. But, grinder and paint make You the welder You ain't. The 3M Cubitron cutting discs are great. Especially the thin ones You were using. They really cut the metal. If You take a look into the metal dust they produce, it is actually tiny metal chips.

[@T1nCh0]

I remember this router from a Marco Reps video and it was a beast one.

[@MattOGormanSmith]

Were you tempted to fill the stand with granite epoxy too? We could see the machine wobbling when you jogged the X axis. I guess it's the M8 feet that are mostly to blame.

[@StefanGotteswinter]

Nope, I just let it wobble - Thats kinda normal with modern machines, if you stand next to a real VMC, it will also bounce and wobble on its anti vibration feet.

[@dominic6634]

These things can definitely get with in a couple thou. Especially with a guy with this kind of knowledge.

[@juanmartin1165]

A nice follow up will be using the self proving characteristics of the square. By using only 4 points of the x and y rravel you can measure both machone and squ.are at the same time.

[@mingyanglu8679]

hello stefan, i am in the process of building an enclosure for the same machine and i was wondering if in your case, you bolted the machine to the frame from behind in addition to the two front holes?

[@jasonneedham6734]

@33:22 degree,.? 180...?😮 35:19 But, watching more, the system is brilliant, amazing. And accurate as well. Thank You, for the lesson.

[@StingrayOfficial]

SO CLOSE TO 100K!!!!!!! LET'S GO!

[@stevecarlisle3323]

I see a lot of home built CNC gantry type mills, and have wondered how, if at all, they were able to achieve any accuracy like you have shown on this machine. It seems to me that the linear rail mounts would have to be ground square, on a much larger grinder. Thanks again for all you great videos. 🇨🇦

[@StefanGotteswinter]

The rail surfaces and alignment rails are indeed machined :-)

[@veryoldtrialbiker4980]

Hallo Herr Gotteswinter. Sehr stabile Maschine, was kostet sie fertig aufgebaut?

[@MPenzlin]

maybe the plate is flat, but the rails in the gantry have been bent. to check it: put a straight edge on the table and test again. same idea for the other axis.

[@StefanGotteswinter]

true - Would be a good idea to confirm against the straight edge.

[@Joelsfilmer]

Quick question if you dont mind. I remember that you had a pneumatic quick change spindle on the old ISEL router. That seemed even more convenient than this HSK system. How come you didn't go for a similar solution this time?

[@StefanGotteswinter]

Small diameter ISO toolshanks are a bit painful, hard to get, since there is no definitive standard like with HSK and also not very stiff. In reality you would have to go up to Iso30 size right away and then you are already in a size range where balancing to 25k is not standard.

[@StefanGotteswinter]

Also the addon changer was about 5 precision levels below the hsk spindle i got now :-)

[@Joelsfilmer]

@@StefanGotteswinter I appreciate the reply! Very interesting. Also, thank you for humouring me and explaining the workings of the Erowa-style chuck.

[@contomo5710]

happy to see you arent the "plunge cut" type of angle grinder user! :P

[@StefanGotteswinter]

Yep, I value a fast, cool and straight cut with the angle grinder ;)

[@taranson3057]

I rather enjoyed the precision hammering to set the cross member. I would really like to get one of these frames can you share their website please.

[@StefanGotteswinter]

Of course: www.cnc-technik-mueller.de/

[@bigwave_dave8468]

Fun project! Did you know you can use vinegar to dissolve mill scale without abrasion? Soak it overnight and the mill scale will dissolve.

[@624Dudley]

Thanks for the detailed explanation of the Erowa system. It’s quite unfamiliar to me. 👍

[@PiotrSarnacki]

Great video, thanks! Do you think a cast iron construction of a similar type would have been of a similar stiffness and properties? Or in other words - is the welded structure + epoxy granite used because it's cheaper, or because it's better, or maybe it's both?

[@StefanGotteswinter]

Cast iron would be stiffer - By a large ammount, the module of leasticy is almost an order of magnitude bigger. Epoxy Granite has seemingly better dampening properties and does not require a foundry that can cast iron - Which are harder and harder to find to have one-offs or small runs cast in an economical matter. Not like 1960s where every model engineer could have his patterns cast in iron for a buck fifty :D

[@TrPrecisionMachining]

good video stefan..thanks for your time

[@PeckhamHall]

An extra manual movement on the Z/(C) axis would be nice, I think, for longer tooling and stuff.

[@luke1811]

To be honest I don't really know what the machine geometry measurements here should tell. Could be a bow in the Y-axis linear guides on the portal as well. I would use a granite square. Check for linearity of each axis first. Map it out. Write down deviations. Measure out the table afterwards, deduct deviations from linearity error. Also, one of the most important measurements, the Z axis perpendicularity left/right front/back was left out. If the table is out of spec you could do the cheap and quick fix by throwing a subplate on it and machine it flat. You said to be doing smaller work, so there should still be enough travel in Z left.

[@StefanGotteswinter]

That was just a quick assesment of the machine frame, not a full inspection.

[@henrikskott]

I see you have the classical 'holey' pants for welding, but I just realised that I haven't considered how you dress in the shop. Of course I've seen the Wacken T-shirts (I suspect I'll be going in a year or two), but do you wear an apron, anything with big pockets or similar when working? Thanks for sharing everything you do!

[@StefanGotteswinter]

Nope, no apron, thats very uncommon here. Workcoat or labcoat for dirty tasks or where I need long sleeves (welding), otherwise t-shirt. I don't like to have a ton of tools on me, when i am in th eshop

[@hendriktabak7036]

Great work on the machine stand! It's really hard to do it this nice in the garden.. 🤟🏼

[@TAH1712]

Very interesting Stefan.

[@peterbennett1792]

What brand is your T handle torque wrench Stefan?. I have used Iscar ones on the past and they have not lasted.

[@tjosephpowderly1066]

very mice. I am frpom sink edm background. At first I redognize the machine frame as a casting I know from China, but yours is a sheet metal envelope with stone and epoxy filling. The spindle is new to me and looks very good. The ITS tooling is veryu familiar. I used 3R Erowa Istema Jackie Smeder and they are great precision. BTW this famework would make a great EDM machine! I look forward to further adventures of this system Thank you/

[@alasdairhamilton1574]

Stefan, I thought you would make your own draw down bolts for the pallets 😊👍🏴󠁧󠁢󠁳󠁣󠁴󠁿

[@billstrahan4791]

I really like those machines. I was hoping you'd say you were planning to use LinuxCNC just so I could see your attention to detail applied to a project like that. I'll look forward to seeing what you do with your new machine!

[@StefanGotteswinter]

I have left the option open to build a linuxcnc controller :) Linuxcnc would have advantages in regards of running 3d toolpaths, but for now, my existing controller has to do.

[@billstrahan4791]

@@StefanGotteswinter I'd say I'll subscribe to see it...but I've been watching you for years. Learned a ton from you that I get to apply in some things I do. I love those little machines, and have been quite tempted to get the FS4MG with an ATC spindle and carousel. They look so well engineered and made. And there are some impressive videos out there showing what they're capable of. The fixed gantry also gives much better workspace area versus machine shop space than a traditional column CNC mill.

[@ydonl]

Shopping with Stefan! :)

[@timtim8468]

Gehört in jeden Haushalt!

[@rolandjollivet38]

The chuck looks great for EDM, but surely the vibration from machining is going to hammer those locating holes in the thin plates into ovals?

[@StefanGotteswinter]

They hold up extremely well for machining

[@StefanGotteswinter]

To elaborate a bit more - They are absolutely suitable and industry proofen for milling/grinding and turning. No heavy hogging with a 63mm facemill sure, but general precision machining on smallish parts? Thats what it is made for. Check out Adam the Machinists youtube channel, in his recent Video he milled a fairly large copper piece on a similar Chuck.

[@joell439]

Very exciting upgrades. 👍😎👍

[@k4kfh]

Very cool looking project! I'm curious, have you gone back to Fusion 360 and ditched Alibre? Or just using both?

[@StefanGotteswinter]

All fusion, its just more powerful and the integrated cam is so good.

[@zsigmondkara]

Very cool machine! Do you know, where I can buy ground grid tables like that in smaller sizes in Germany (EU is fine too)?

[@StefanGotteswinter]

Yes: vakuumtisch.de/ These people will make you whatever steel/cast table you want :)

[@lvxleather]

That spindle is awesome. I bet when it's warm that 2 micron becomes zero.

[@thijsstavenga4350]

Can you eleborate on the decision of stick welding the frame outside instead of tig welding the frame inside? I am trying to learn the welding process and you clearly have thought about this and i would like to know the decision process. Thank you!

[@TheOpinionationer]

I can't speak for Stefan, but, a couple of advantages are that it's faster, and cheaper. Stick welding doesn't require shielding gas. The welder set up is easier to move around (there are no gas lines, foot pedal or gas cylinder to worry about). In some cases a stick welder can weld in a more confined space because it is a one hand operation and the stick is skinny. TIG requires access with the torch and the filler rod. Finally, the benefits of TIG are not required for building a frame of low alloy structural steel.

[@StefanGotteswinter]

Its faster, more tolerant to dirt - With tig the parts would have to be clean-clean-clean, not just half-assed clean with a flap disc :D Also cheaper and I don't have space in the shop to do large welding projects inside.

[@RustyInventions-wz6ir]

Very nice work sir

[@aqcd]

not related to machining, but i will be going to wacken this year for the first time!

[@StefanGotteswinter]

Have fun, its a great experience. I was 2005, 2006 and 2007 :)

[@steveggca]

Hi Stefan ,what a great machine! looking forward to seeing it evolve. About a month ago the channel marco reps did a factory tour of the spinogy factory , you get to see some details of the inner workings of the spindle. Does your spindle have an encoder that allows for rigid tapping? He also is constructing a machine using linuxcnc and a watercooled spinogy spindle. interestingly he is using EtherCat servos, that allow for entirely digital domain servo control instead of +/-10VDC .

[@Matt-jz7to]

This is a very nice build and it looks very rigid. Do you know rougly much your friend payed for the FS4MG body ?

[@StefanGotteswinter]

I think its Mid 4 figures with guides and ballscrews.

[@kundeleczek1]

Actually you should use 1um indicator for that kind of job.

[@douro20]

What make is that tapping head?

[@StefanGotteswinter]

Tapmatic

[@ttjarrett]

We all know the KZbinr making knife parts with a Kern... Kinda like shooting rats with cruise missiles...