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24mm or you can mount the cassette higher or drill the bed to accommodate.

@@stevelkneivel Cheers mate I actually found another youtube vid with that info.

They are currently beta testing on the an ER32.. Reach out to Don on Discord and see how far along they are th-cam.com/video/FpapUp5JKUo/w-d-xo.html

That spindle clamp came with the i2R CNC, so its factory. But it's pretty much identical to this unit on Amazon : www.amazon.com/RATTMMOTOR-Spindle-Bracket-Diameter-Engraving/dp/B078HB21VG/

That fork sensor isn't for everyone, it works for our use case very well. It accomplishes the intended purpose of saving the bit from contacting any metal during the height probe process, and extends the life of the bit. We chose to sacrifice speed for longevity.

@@mikekikkert6847 I’m really interested in the fork sensor. I haven’t seen anyone use it before. What kind of accuracy can you get with it?

According to the specs for that fork, the accuracy is 0.008". In our use case, we carve the same material all day long to a depth of 0.025". I can tell you that the fork is 100% accurate and repeatable, Any variance would produce a visible difference in our process. The real benefit to us is that our fine bits don't have to touch metal for the "touch-off" process, making the super-fine bits last much longer.

I saw that RapidchangeATC started prototyping a bit changer for large surfacing bits. Here is the video. th-cam.com/video/02X4wZt9xH8/w-d-xo.html

We didn't think about that until the first bit slipped a little. Most of the collects held the bit just fine, but a couple did slip. We now install a small O-ring on top of the bit to keep the bit from falling down the collet. Have seen some others use a small piece of heat shrink tubing instead. That has been working great

You could use a torque wrench to measure the force needed to loosen the nut.

In the video, the controller used was a UC300ETH base board, which prefers NPN sensors, and the AXBB base board has isolated inputs, so either can be used. We used PNP for the AXBB, and I have expansion I/O on the UC300ETH that allows for PNP. The PNP sensor used is 3-wire, as we did not use the teach function via the wiring.

I want to hear more about the fork sensor.

According to the specs for that fork, the accuracy is 0.008". In our use case, we carve the same material all day long to a depth of 0.025". I can tell you that the fork is 100% accurate and repeatable, Any variance would produce a visible difference in our process. The real benefit to us is that our fine bits don't have to touch metal for the "touch-off" process, making the super-fine bits last much longer.

Great questions. I didn't think about the bit falling out of the collect until after I bought mine from RapidChange ATC. Most bits\collects were pretty snug and weren't an issue. Several did fall out as you mentioned. After a little trial and error, now I just put a small O-ring on the top of the bit to keep it from falling out of the collect. As for keeping the collects clean, I agree. That's why we built the custom enclosure you saw at the end of the video. Works really well. We approached this new ATC with a healthy dose of skepticism like you, but it keeps impressing us. We have had it about 2 months now with hundreds of bit changes per month. We have become so comfortable with it, we don't even worry about it anymore. The guys are Rapid Change ATC have been great to work with as they launched this product. Easiest to connect with on their Discord channel

We can tell you that we had all the exact same doubts and fears as you do. The price point is what finally convinced us to test on one CNC machine. Cautiously at first, then gaining confidence as more and more bit changes happened without issue. The first CNC is using a HUANYANG Water Cooled CNC Spindle Motor 220V 2.2KW, and after 6 weeks has made hundreds of bit charges without issue. Once we gained the confidence in the RapidChange ATC, we ordered the unit for the 2nd CNC. The 2nd CNC has the same spindle, but uses a different VFD that wasn't able to control the spindle down to 2000rpm, so we changed the VFD and that CNC is now working without issue. We can all agree that there are just too many varieties of CNC, spindles and VFD controller combinations to insure that it will work on everything. That is why I mentioned that IF you could consistently control your spindle at that speed, this solution may be something to consider. Ask the team at RapidChangeATC any questions you have, they are incredibly responsive both on the website and their Discord channel.

@@mikekikkert6847 I did write to them a few days ago with some questions, but so far no response.

Yes, some VFD's can and some can't run at that low speed. We have the RapidChange ATC installed on a few different CNC's. We do need to upgrade the VFD on one CNC, as it has the same issue you are experiencing with the spindle.

@@mikekikkert6847 Mike, thanks for all the help! I would appreciate knowing what spacing you use. And thanks for the file offer but unfortunately I don’t run either of those programs.

Thank you very much!