Zentra six jaw chuck and backplate

[@CaskStrength777]

I can attest to the awesomeness of this style of chuck- I use a 3 jaw adjustable at work with a collet holding tool in the jaws. I rework aerospace gauges sometimes in the 0.00005" TIR range using this setup manually. People who say scroll chucks can't give accuracy have never used a well made adjustable runout version- like this. Nice to see someone else actually say that out loud.

[@houseofbrokendobbsthings5537]

Glorious to see you back. Classic Stefan excellence in presentation and execution. _Dan_

[@TheMiniMachineShop]

As usual picked up something new.. rotabroach.. so tired of the chip mess from drilling and boring all the material out to get a 1" hole! Thank You!

[@silverbullet7434]

Excellent job , great the way you detail everything with explanations. Thank you , Master Machinist , my old 6 jaw I'm sure will be torn down and serviced at some point. Since I've never done it before , watching it done just inspires me to do it. I'm always amazed with your work and the way you do things. God bless

[@tonyburndred9828]

Pleased to see you back Stefan, nice work

[@ROBRENZ]

Excellent video Stefan! Glad to see you did the tubular handles in the photos. They are so comfortable. I would say something about your video frequency but who am I to talk ;-) ATB, Robin

[@wileecoyoti]

ROBRENZ both of you should be posting more often :) but, you know, somehow without sacrificing quality or content...

[@iteerrex8166]

Yes Robin what ever happened to that giant stone? Collecting dust? Weeds growing around it? Using it as a stepping stone to the get to the top shelves? or what lol. Dont know u so hope u dont mind a friendly msg.

[@Larry1942Will]

I'm also looking for the next surface plate video.

[@StefanGotteswinter]

Thanks! The tubular handles are so much nicer to the hand. Did that also to my vice-wrench and the colletcloser on my 5C indexer... Holding my breath until you release a video!

[@andyZ3500s]

Is ATB a secret code of top ranked machinists?

[@normanfeinberg9968]

Nice shop practice.You bring a lot to the job site so it looks easy,but of course it's not.It surprises me how many people in the U.S.A don't have a clue how things are made.My hope is that people like yourself will enlighten them.Thanks,keep up the high quality videos and creative energy

[@akfarmboy49]

some how I missed this video, glad you got on the 6 jaw chuck band wagon, I can't live with them, i need to cam-lock base to mill. thank you have good day , liked the town video at end.

[@macebr5394]

"I always loose the spring on the key..." xD

[@StefanGotteswinter]

I have realy no idea how this happens :(

[@ianide2480]

Take note, He drops the key less than a minute later. All I could think was, I think I found out how he losses the spring hehe...

[@MrShobar]

"lose"

[@robertklein9190]

"lost"

[@turningpoint6643]

I had to chuckle at that as well. Anyone when first learning not quickly teaching themselves to automatically remember to remove the chuck key after once or possibly twice forgetting it, then maybe operating machines isn't for them? Drill chuck keys with the spring loaded "safety" addition are even worse to try and operate. The garbage can is the best place for those springs. :-) Great video as always Stefan, I have the exact same spindle nose on my lathe. I've yet to figure out why they just didn't use a D1-3 mount. It could hardly add much more to the machines selling price and would be a better and more repeatable mounting system. The later models of my lathe did start being offered with that D1-3.

[@tuffymartinez]

Hello Stefan...I am slowly making my way through your video library...Such a pleasure!!! ...Or should I say a very positive mindset to approach the work by the A-B-C's instead of cutting corners...TM

[@ianmcdonald7368]

Varying run out using different pinion position on the chuck......that's why one of them has a little "O" mark on it so you don't get lost. Another nice vid Stefan, been following your progress on Instagram, keep up the good work.

[@chrisstephens6673]

Ian McDonald and if there is no "O" it is the key hole by the the label.

[@ClipperDays]

Great to see you back. I noticed you use a vacuum when turning cast iron. I do the same and boy o boy, what a difference when cleaning up afterwards. My 6 jaw came with the lathe and needs the cleaning and set up correctly, so well timed video. Thanks.

[@StefanGotteswinter]

Yes - I did a fair bit of cast iron in the recent time, and I learned to use the vacuum, otherwise the shop ends up to look like a coal mine.

[@samjadaci]

There is always something new to learn from your videos...and yes Welcome back!

[@stxrynn]

I've been battling a 6 jaw Bison for quite a while now. Thank you for giving me a couple things to look at. I really do appreciate it.

[@literoadie3502]

That chuck and back-plate look beautiful. Holding some large-diameter thin-wall parts will be fun!

[@Larry1942Will]

Seems like an exceptionally nice Chinese chuck. I have a Chinese 5C chuck with the adjustable back and it is also very nice. So they can do nice work at still reasonable prices, just don't look for the cheapest.

[@tobyw9573]

That runout adjustment mechanism is extremely meaty!

[@GarryFullerSr]

Another Great Video. I learn so much by watching your Videos. Somethings you knew years ago and forgot, others you never thought of. Thanks.

[@kentpanter2044]

Stefan, Absolutely outstanding video. I do not own a 6 jaw chuck but now plan to get one soon. Thanks for all the great ideas. Love the music and really love the drive at the end of the video.

[@TomChame]

Very nice to see you back. Great work, thanks.

[@PhilsProjects]

Halo Stephan. I have developed the habit of always tightening the chuck on the 0 on all my truset chucks, after a while it becomes automatic. great video, its always interesting to see your setup's

[@CNCJoeFromRomeo]

Excellent work, Stefan! I always learn something in your videos. Love the spot grinding technique...it will definitely be more accurate, too.

[@gertskjlstrup1804]

Love it, glad to hear your still alive and kicking

[@lorenlieder9789]

Great video Stefan and nice work mounting your new chuck.

[@hussainali9999]

Thank you Stefan, you teach all the world, thank again from SAUDI Arabia

[@MrLukealbanese]

We've been waiting, and were not disappointed!!!

[@TraditionalToolworks]

Very nice video, great job on that backplate. I have so much respect for you guys using 6-jaws, I almost always use a 4-jaw to help compensate for my poor machining...;-) OTOH when I watch you adjusting each pinion, it doesn't seem too different than a 4-jaw...very nice how you surface ground that backplate, that bore really fit nicely on the spindle nose! :-)

[@arcrad]

Don't turn on it, take it apart!

[@azyfloof]

Bobby dazzler! :D

[@StefanGotteswinter]

Bloody ripper.

[@ickipoo]

Bob's your uncle.

[@vilts]

Bee's knees!

[@coyzee1]

Crikey, you speak Australian too.

[@bcbloc02]

Nice clean up and get in operation video. Audio got tough there at the end, I could only make out some of what you were saying.

[@StefanGotteswinter]

Thanks! Not sure what with the audio happened. But I guess what I said was not as important ;)

[@FeeeshEP3]

Top! Könnte dir den ganzen Tag zuschauen. Wirklich toll was du da machst!

[@machiningbasics1729]

Scroll jaw chucks can be very accurate. I have 2 3 jaws one for rough work and one for precision work. I’m still a 4 jaw and faceplate fan. Nice video !!

[@iteerrex8166]

Good to see you after a long time Stefan. Congratulations on the very nice new acquisition :) Don't be a stranger now, drop by once in a while lol

[@googleuser859]

Welcome back :-)

[@williammills5111]

Stefan- Always glad to see another video from you; clear, concise and accurate, just like your workmanship! Many thanks... Bill

[@CreaseysWorkshop]

Thanks for explaining balanced cuts. I wish I had known that. So obvious once you know, but I didn’t!

[@Gkuljian]

That was a good logical demonstration of chuck accuracy. I was previously of the mind that if one needed to use the same pinion, then the scroll was worn. But in reality, no scroll fits perfectly. And why not aim for accuracy, even though it's not a collet. What was that about Chuck Norris? Haha.

[@timmallard5360]

Awesome as always! I'm going to look into these. Love the new intro music reminds me a playing Mega Man as a kid!

[@Mytuberify]

Usually the, on the chuck, “0” marked pinion is the one that gives you the zero runout tightening. Could it be you switched the pinions around since you not tighten to zero runout where the “0” is stamped? Good stuff all the way, your channel is. Keep it up👍

[@mausball]

Nice work! I especially loved the callout to EEVBlog ;-)

[@666Tomato666]

call-out was nice, but the accent 'orrible ;)

[@wolfitirol8347]

Zentra you can always buy at the moment they have good quality and medium priced... For less than the half of the price you get a SanOu 6 jaw direct from China but than you have to have little luck to get a perfect chuck i bought two steel chucks 160mm from them and they are excellent made i didn't expect such a good product for about 100eu that's why i bought the second 😁 with my DIY D1 4 backplates i can chance them within short time...Stefans lathe has also a very fast and good spindle nose.. and yes they have normal 7° 7' 30'' short taper just like the camlocks...top Video as always Stefan 😎

[@scottmacintyre8647]

Not sure I followed the 4 hole PCD when you want 3 holes - surely that puts them at 90 degrees rather than 120...what am I missing ? Great content, so helpful. Thanks

[@metusa666]

Very informative video i have a second hand chuck in my collection and one pinion was marked with a ring of dot punch marks now it makes sense I learned something new thanks

[@MegaCountach]

Another great video Stephane, keep em coming! Cheers, Doug

[@billchiasson2019]

Another awesome video! Always enjoy watching them.

[@ronpeck3226]

Thanks Stefan, you will be spoiled with the six jaw, you can chuck up eggs with it, and they don't have to be boiled!

[@richardgregory6653]

good timing on video as I am looking at purchasing a six jaw for my lathe (200mm),excellent job!

[@PaulWattsSpringGunning]

My older Buck six jaws only had one pinion. Don't know if Buck did that on purpose or not? I have a newer Taiwan made Buck that has two pinions. While there is a slight difference in repeatability between the two it is very slight. Less than .0003 inch. On a older Chinese six jaw I used to run it always ran .0006 with just grinding the jaws. I do a lot of thin wall plastic parts. distortion of the parts when doing ID work is too great with three jaw chucks. I absolutely love six jaw chucks after making the change. Solid jaws like the one you have will go down to smaller diameters without having to make soft jaws like two piece jaw chucks would require you to do also. Your chuck looks to be of very good quality. Nice score!

[@dgedi78]

Now you can machine high precision macaroni. Take that ThisOldTony ! :D

[@copasetic216]

That’s a great idea to remove the chuck for testing the fit. Nice video man. Good to see you as always

[@matthewhelton1725]

Steven, I have the same problem with my chuck keys... that spring always seems to fall off.

[@glennfelpel9785]

Excellent as always, Stefan. Who ever could do a thumbs down? Strange isn't it.

[@andymandyandsheba4571]

hello good to see you back again

[@sharkrivermachine]

Very nice work as usual, thank you for sharing

[@68sweetnovember]

Wonderful. Looking forward to seeing you using this :-)

[@brandontscheschlog]

Awesome addition to the lathe.

[@denniswilliams8747]

Always inspiration and incentives. Thank You

[@12345NoNamesLeft]

It's a sweet Stefan Sunday !

[@ryanb1874]

I wish I had some of the things you have, keep building and being wear-conscious

[@joshua43214]

Nice job as always. Is "bee zhon" the proper way to pronounce Bison? I always assumed it was "bye son" because they use a bison in their logo.BTW, you have a "0" on that chuck marking the key hole that was used during manufacture.

[@Gottenhimfella]

Stefan You didn't show a final check, on nutation, or wobble of the workpiece axis relative to the spindle axis. Another way of saying this, I suppose: how perpendicular are the jaws to the face of the spindle nose? including at different diameters?

[@1873Winchester]

I am looking at a 125mm Zentra 3-jaw chuck right now, adjustable with 2 piece jaws. I thought they where made in europe though! I was told by someone they might have been made i the same factory as bison chucks.

[@bartouleterrible]

Still a pleasure to see your video (as your instagram account). A question from a newbie why are you using grey cast iron and not steel? because there no risk for safety and it's cheaper or for any other reason ? thank you for sharing both your project, experience and comments. It's always instructive and interesting. greetings from france !

[@turningpoint6643]

Gray cast iron is used because of it's vibration dampening abilities and is pretty much standard for most factory machined back plates unless the chuck is designed for and meant to be used on a high rpm machine.

[@StefanGotteswinter]

Mostly because cast iron wears better than unhardened steel. Dampening abilities of cast iron on such a solid part do not have much effect.

[@outsidescrewball]

enjoyed--great discussion/instruction/build

[@markfulmer8501]

HI Stefan- thanks so much for another excellent video

[@MrShobar]

The adjustability shown is an old idea. First patented by Buck, et al. in 1953. U.S. Patent no. 2639157. It expired in 1968.

[@StefanGotteswinter]

Yes - Didnt say that it is something new. There are even different styles, Bison has an integral backplate on their adjustable threejaw chucks with tapered, tangential screws.

[@capman911]

Very beautiful town or village you live in.

[@thunderstruck1078]

Let's hope Angela Merkel doesn't ruin it.

[@thunderstruck1078]

@Ralph Macchiato That's what we need, sorry. Sovereign states. Germany that looks like Germany, Italy that grew out of Italians, ... I don't want any of those beautiful cultures and ethnic groups to disappear or to become a minority in their own homeland.

[@garyc5483]

Nice job Stefan. Wish I could justify a 6 jaw. Maybe one day. Thanks for sharing. regards from the UK

[@MecMod_Homeshop]

Hi Stefan, you are a light house for me, thanks for your passion and thanks for your video. Please I need to ask you something, where dis you take that beautiful block of Cast-iron? I can’t find here in Italy, in Italy the industry can find and have everything and more, but private people can’t find materials, even C40 some time is hard to find for us. I will love to do a fix tool-post base for my lathe, now I dis in C40 putti g together two block, but c40 didn’t absorb vibrations, etc. please can you tell me a name of a possible supplier? Thats sale small quantity when needed, thanks Stefan

[@davesmith9325]

Nice to have you back. prefer this music 😉

[@tobyw9573]

I have a Rohm keyless drill chuck, I might not have bought it if I had known I could not pronounce the name, LOL. ;)

[@tobyw9573]

Hmmm. Perhaps Stefan can’t pronounce Rohm either... But how will we ever know? But seriously, I had heard that “les Chinois” had been moving from “kits” (as Stefan called them) which required a complete d/a, cleaning, and remachining, to top quality. This unit seems to be an example of that strategy. Thanks for sharing! :)

[@MaximumDistortion2]

Hallo, ich habe eine Frage: Sind die Zentra-Futter generell zu empfehlen? Denn der Preis der Zentra-Futter ist zwar verlockend, allerdings mache ich mir Sorgen um die Qualität bei so einem Preis.....

[@63256325N]

Good to see you. Good job and thanks for the video.

[@roleic7246]

Nice project again, Stefan. To my eye the stick-out of the whole chuck assembly seems a bit long. But since you want to mainly use it for plastic work with its rel. small cutting forces it is plenty rigid for that. Concerning the video frequency of course everybody would enjoy more and more of the good videos coming; daily if possible... But we all know that they are a lot of work. So keep the pace such that it is also fun for you then the excellent quality keeps its level to the joy of everybody: you and the viewers. (and if you keep them waiting a bit they appreciate your videos even more...;-)

[@StefanGotteswinter]

Ahoi! Its not much more overhang as with my 3jaw - I used the 6j already for a bunch of stainless and toolsteel parts and, the increased holding power/stiffness from the better clamping outweights the slightly larger overhang by far B) I wish I could do more videos, but making parts and sending them out pays part of the bills, adsense doesnt ;)

[@roleic7246]

Stefan Gotteswinter As I said I am happy with your output in quality and quantity. Have you asked your customers whether you can videorecord making their parts? If they allow it you could make more of your interesting vids. Fenner is doing that often. Hit two birds with one stone.

[@StefanGotteswinter]

Keep in mind, filming makes stuff take 3 times as long as it would normal take ;) I try to film as much customer projects as possible, but as said, its just not always possible. And editing can be a chore if the narration is not already done when recording. Voiceover takes forever :/

[@somebodyelse6673]

None of the gear parts are sintered metal? Thanks for sharing with the world!

[@StefanGotteswinter]

I think they are die-forged.

[@ryanb1874]

on your 6 jaw, you use one pinion, lug position for final tightening, but, do you mark all of them and rotate the pinion you do tighten so they all get used and you don't warp something?, in different jobs of course

[@frankyboy4409]

Whoa, whoa, whoa, where is our regular intro music?

[@StefanGotteswinter]

I used the wrong template ;)

[@Gkuljian]

I was wondering where the murder mystery intro music went.

[@gudynielsen8780]

Hey Stefan As always nice work, just got a set of twins in form of a 3 and 4 jaw Röhm ZS 140..😁 So i need to make some backplates..Where do you buy the GG25 in that size, Denmark is useless in that area 😏

[@scootertramp4355]

At 26:38 you use the technical term the scroll thingamabob. I looked at a parts catalogue and couldn't find it. Do you know something I don't...........

[@rollandsicard1628]

As always, an excellent video, very precise language.

[@tobyw9573]

It appears the geared side of the scroll plate has galled the rear body of the chuck where it absorbs the thrust of the scroll. Why: Rough surface on scroll? Debris? Soft metal? Lack of lube? Insufficient bearing area? Certainly was not high rpm from tightening chuck too rapidly! ;)

[@-Mats]

Can you recommend this Zentra six jaw chuck or would you have bought another chuck if it was today? How often do you center it?

[@MrZhefish]

where did you buy it? could you share some of your ressources where you buy your lathe/mill and other machinists tools please? would be most helpfull. danke :)

[@tomaszkazmierczak7327]

Stefan - backplate from cast iron or from steel? What is advantage of cast iron backplate if there is any?

[@moleklm]

great video production and explanation of procedures.

[@joecnc3341]

Ausgeseichnet video, Stefan. Vielen dank!

[@machineshopatthebottomofth3213]

Interesting as ever Stefan. Is the three jaw going to clutter up the shelf from now on or is there a situation where you will still use it?

[@StefanGotteswinter]

Yep - As a Softjaw chuck :) As we speak, I got it mounted with large aluminium pie-jaws bored for a recuring job.

[@machineshopatthebottomofth3213]

Great use for it. Looks like a 6 jaw may have to be on the birthday list for me!

[@tobyw9573]

It appears the geared side of the scroll plate has galled the rear body of the chuck where it absorbs the thrust of the scroll. Why: Debris? Soft metal? Lack of lube? Insufficient bearing area? Certainly was not high rpm from tightening chuck too rapidly! ;)

[@JCisHere778]

Love the intro music. 😁

[@JBFromOZ]

Very cool! So much to learn

[@StefanGotteswinter]

Thank you!

[@ianpendlebury3704]

I was wondering where you had got to? Interesting, as always.

[@StefanGotteswinter]

Workworkworkwork ;)

[@wauser5456]

Do you ever plan on marking or filling the pinions to have a dedicated one to use, or do you just use the pinion with the 0 punched outside of it?

[@StefanGotteswinter]

I go with the 0-punched one.

[@eriklextro8223]

Hello Stefan, the Project Link does not work

[@warrenjones744]

Well done Stefan, I know exactly what you are talking about when you say plastic parts can walk out of a three jaw! It can be annoying.

[@StefanGotteswinter]

Especially annoying when the part that walks out the chuck hits you on the forehead ;)

[@shawnmrfixitlee6478]

Great job , ENJOYED !

[@cykelboss8748]

do u say låber like in the nordic or like ( aaaah ) L ( aa ) laaber ( and what does it translate too ) laber means hot in Danish. Løber Löber means to run..!! ?

[@keith73z28]

Very enjoyable video. You have quite the following on youtube. I see some of the very best machinists and also likeable creators here following your content. = Damn good Stefan.

[@MakinSumthinFromNuthin]

I tried to say six jaw chuck 100 times but only got to 4 1/2 ☹️

[@daveanderson2316]

The boogie man looks under his bed for Chuck Norris..

[@doctordeutz3601]

8:40 Poolnudel 😅 Colles Video ich muss für mein neues backenfutter auch eine Adapterplatte machen

[@adrianblack7966]

Happy Birthday, this video!

[@TAWPTool]

Yet another great video! Thanks for posting.

[@stevecallachor]

Stefan, Whenever I dismantle things for cleaning and inspection I always wash parts with liberal amounts of cleaning solvent. However I have noticed that you do not do this, but rather use clean rags or shop towels to remove grease. Is there a particular reason for your method that has possibly escaped my logic? Regards Steve Callachor New South Wales in Australia

[@StefanGotteswinter]

Ahoi! Yes, I dont like to use solvents, especially stuff like break clean (which I dont even stock in the shop) or degreaser (which I also dont stock :D) when I dont absolutely have to. I use a fair amount of IPA, which is not as bad for the health and flashes of clean. Parts like the chuck go in the ultrasonic cleaner with a basic degreaser solution.

[@googleuser859]

I also use ipa, but the Indian pale ale variety, it's also good for health.

[@12345NoNamesLeft]

IPA = the beer ?

[@robertfoss803]

Isopropanol Alcohol