ATC module for ER20 spindles

[Daz]

Hello everyone,

I have developed an Automated Tool Changer module for ER20 spindles. It works on the impact driver principle and delivers 35Nm or more of nut-tightening torque, meeting the ER20 spec. Happy to chat and answer any questions. Let me know what you think.

Here is a video of its operating principle:
https://www.youtube.com/shorts/eBymr9Z7TvU

And here, when I used it to mill an aluminium vacuum holding plate, doing some decent cuts with an 11mm, 2 flute end mill.
https://www.youtube.com/watch?v=FH3Ue6h8MHE&t=1s

[EddyCurrent]

Daz,

I've posted a link to this on the CamBam forum, it is very interesting. https://cambamcnc.com/forum/index.ph...80626#msg80626

[Daz]

Thanks, much appreciated! Let me know if you have any questions, happy to chat.

[needleworks]

No idea how it works mate but it certainly looks good !!

[EddyCurrent]

Daz,

Someone on the CamBam forum asked if there were any issues around cross threading of the collet nut.

[Daz]

Hi, thanks. I was trying to register on the CamBam forum, but the registration is disabled. I have reached out to the support for help.

With regard to the question about cross-threading, I have performed about 300+ tool loading and unloading cycles during development and subsequent use and didn't have a single cross-threading problem. The cross threading can happen if the spindle doesn't have a good concentricity with the tool holder, or the tool holder gets dirty with swarf, and the nut doesn't sit straight in the holder.

The tool holder can take quite a large degree of concentricity misalignment, but if a machine has crap homing, and one of the axes is off by a few mm from the previously set position, then I expect the cross threading can happen.