Is the RapidChange ATC a good fit for my PrintNC?

[@Trevieze]

Hi, just found your channel. I've been somewhat timid about the feed rates you're using. I have a PrintNC almost identical to yours with a Centroid Acorn controller. I am keeping my feed rates around 600 mm/min. I have been thinking I could get away with 1000 mm/min. You have given me the confidence in ramping up my feed rates. Love the tool changer!

[@SebastianMusser]

@@Trevieze are you talking about cutting feedrates? I cut up to 3500-4000mm/min (depending on the toolpath)

[@BryanHoward]

My biggest worry with something like this is getting the necessary torque onto the nut. Will be nice to see a followup video after a couple months of use on how it's working out.

[@MTFreestyler]

Same here. I guess that could be tested with some sort of torque wrench to see how much effort it takes to undo the nut after it was tightened in the ATC

[@projects4home]

Depending on the rotation direction of the nut, it might tighten itself while milling. This technique is used in a simple angled grinder tool. Even if you dont tighten the nut of the blade well, it will tighten better by vibrations and the right rotation direction.

[@juliankonig1412]

Not a Problem. This system uses the inertia of the spindleshaft. So for tightening round about 1400 rpm are used. And for loosing 1650 rpm. Depending on the spindle. ER20 getting around 20Nm of torque. I meassured an axial load of around 2000N with only 15Nm of torque with a 8mm bit. So no worries about torque... There a indeed other cons. But overall it is usable.

[@projects4home]

@@juliankonig1412 checked the price of that ATC. Is about 250$ for 6 tools. I dont get the concept here. Cant we just mill a block of aluminum that holds the collets? Or is there more to this tool? I dont see any cables coming out of it. Is there anything special?

[@juliankonig1412]

@@projects4home Its not rocket science. I actualy building one for myself. So yes. Not a big deal. On the other Hand its not a lot of money for such a system imho.

[@C-M-E]

Man, I like where that's going and it's a very novel, approachable solution versus industrial versions. I'd have some reservations on mechanical wear, but I suspect that's something you'd find out after a week of use or so. Definitely worthy of a bit more reading on my end. 👍

[@tinkot]

Certainly Interesting! but dont forget when installing a tool in a collet that the runout must be checked, especially with these ER collets. Generally speaking, collets are designed for a manual installation, aiming at a more permanent installation in a toolholder. Anyways, i see how this could be usefull when a part does not require tight tollerances.

[@gilcd85]

This looks great! Have you tried boring and drilling operations with this ATC? I'd expect axial would be more challenging than radial operations in this case.

[@dynamixsystems]

Those chips on the linear blocks hurt my soul!

[@T0tenkampf]

almost as badly as the stickers on the Rapidchange!

[@my.techlab]

Great jog Sebastian..

[@precisioncompositestechnol6835]

Unfortunately, not all spindles will go down to the slow speeds required. 2.2Kw Square bodies have a minimum 6500 rpm. Holding torque on the collet nut is a big concern. Especially if using really long bits (8-10” OAL), which this system can’t really accommodate. I’d also be concerned about the wear on the nut flanges over time.

[@andrewt4604]

Good afternoon! I want to build a CNC machine, and your CNC machine design has piqued my interest. However, I have a question. My question concerns the frame construction. As far as I understand, the frame of this machine is made of square tubing. In this design, the square tubes are stacked on top of each other and connected with bolts, if I understood correctly. Could you please tell me if it is necessary to process the parts of the square tubes that are stacked on top of each other in order to avoid deviations from the flatness of the entire structure? Or is the manufacturing precision of these tubes already sufficient for building such a machine? Or should I choose specific tubes that are manufactured with special tolerances? What would you recommend? Thank you in advance!

[@SebastianMusser]

@@andrewt4604 hi! Checkout the printnc wiki and the other videos that I have online.

[@MTFreestyler]

Do you just have the normal 2.2kw spindle that comes with the printnc kit? I wondering if my kit one would be compatible since it has a supposed minimum rpm of 6000

[@SebastianMusser]

yes, its a standard 2.2kw watercooled spindle. I dont know which spindle is part of the kit at the moment, but my spindle is from "gpenny"

[@MTFreestyler]

@@SebastianMusser verrrrry interesting! I thought my spindle wouldn't work but I guess I'd just have to adjust the minimum RPM down and it'll work fine

[@fabog3732]

Which cnc controller board are you running ?

[@SebastianMusser]

I use the flexihal board from expatria !

[@PhoKingLitMedia]

what controler are you using ?

[@SebastianMusser]

Hey ! I am using the Flexi-HAL board (like probably 99% of the PrintNC community:) )

[@손-t4s]

그냥 atc 스핀들 하나 사...

[@xyzspec82]

Last time i checked, I could get an ATC spindle for the same price. Makes no sense to me 🤦🏻‍♂️

[@chernogorsky]

Have you add compressor, all the airs, water colling, cost of the tools into equesionss ?

[@SebastianMusser]

I paid $300 for this magazine. Atc spindles start at maybe $1000, then you need a compressor and tool holders etc. But if you can get a real ATC for 300 bucks- sure go for it!!

[@xyzspec82]

@@SebastianMusser you have to add your actual spindle kit to the 300 you paid for that. Las time I checked the price, it was around 600 for what you got. I'm glad it went cheaper. 👍🏼

[@Robinlarsson83]

​@@xyzspec82well, depends on how you look at it. If you get a standard VFD+Spindle kit they are usually a good bit less than 600 USD these days, more like 3-400, from similar suppliers as a ~1000-1200 USD ATC spindle (as in direct from China). But, the ~1000 USD ATC doesn't include a VFD, so you'll need to add that. I spent ~200USD for my spindle, a slightly more potent 2.2kw than the standard kit ones, and got a ~120 USD VFD with Vector control and up to 3.2khz output, so when it's time to go ATC (at the latest when I've used up my current spindle😅) I'm good to go on the VFD front if I stay with 2,2kw spindles :) But I totally agree, spending more than maybe ~3-400 USD on a Rapidchange may not really make sense, even less if your starting from scratch.

[@T0tenkampf]

Try using one of those cheap ATC and then let's see how you feel. The ATC tool holders are typically garbage and getting a decent set will cost another 100 USD per position.

[@DavidBeede]

I have one of these too. I build musical instruments. A gent named Jim Neem, a retired engineer, has done 5 in depth reviews on his site, including torque testing. It touches off each tool everytime and does the math to make all tools at the same Z zero. For the DIYer, it's more involved than some holes in a block and it's patent pending. If your time is worth anything to you, you're better off just buying one than reinventing the wheel. As this catches on even weekend warrior hobby machines will seem incomplete without an ATC. kzbin.info?search_query=jn+woodworks