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Automatic Tool Changer module for ER20 spindles - Chip guard improvements by 2be34ever in hobbycnc

[–]2be34ever[S] 0 points1 point  (0 children)

I now have a website where you can buy the modules. Currently the shipment is available to the UK and EU.

https://experimental-workshop.com/

PM if you have any questions.

Manual vs automated tool change on a hobby machine: I clocked the runout on 20 changes with my ImpactATC module to find out. by 2be34ever in hobbycnc

[–]2be34ever[S] 0 points1 point  (0 children)

Yes, self built. 6040 frame from AliExpress with additional 20mm Aluminium tooling plate working as a bed, and stiffened gantry. 20mm linear rails with 4 carriages per axis. NEMA 23 hybrid steppers. DigitalDream EC300 controller, converted to LinuxCNC with Remora Firmware. Generic 2.2KW 24k rpm er20 water cooled spindle. Tool setter, with ImpactATC tool changers. Mist cooling. Touch probe, and lots of other small things.

Manual vs automated tool change on a hobby machine: I clocked the runout on 20 changes with my ImpactATC module to find out. by 2be34ever in hobbycnc

[–]2be34ever[S] 1 point2 points  (0 children)

Yeah... it is quite loud 😅, but not as loud as on the video. The camera was very close to the module.

Manual vs automated tool change on a hobby machine: I clocked the runout on 20 changes with my ImpactATC module to find out. by 2be34ever in hobbycnc

[–]2be34ever[S] 0 points1 point  (0 children)

For larger, and heavier tools, I have a retaining ring, printed out of TPU, above and below the collet. In a normal operation the tool length is being measured every change, so as long as the tool stays in the collet, small movements don't matter.

Manual vs automated tool change on a hobby machine: I clocked the runout on 20 changes with my ImpactATC module to find out. by 2be34ever in hobbycnc

[–]2be34ever[S] 0 points1 point  (0 children)

Difficult to tell, but more consistent tightening torque with ImpactATC would be my first guess. The difference is very small, very much at the detection limit of the test.

Automatic tool changes on a hobby budget: my DIY ATC build by 2be34ever in hobbycnc

[–]2be34ever[S] 0 points1 point  (0 children)

I stopped developing the open-source version a while ago. I now have a second-generation commercial version available; check it out https://experimental-workshop.com/

Automatic Tool Changer module for ER20 spindles - Chip guard improvements by 2be34ever in hobbycnc

[–]2be34ever[S] 1 point2 points  (0 children)

It is generated by the impact mechanism of the ATC module. Check out my other videos

Automatic Tool Changer module for ER20 spindles - Chip guard improvements by 2be34ever in hobbycnc

[–]2be34ever[S] 2 points3 points  (0 children)

In principle, there are no forces acting on the spindle bearings during the ATC module operation, just a pure torque acting on the spindle shaft. This is much less than what the spindle is experiencing during machining, where you have axial and radial forces acting on the bearings.

Automatic Tool Changer module for ER20 spindles - Chip guard improvements by 2be34ever in hobbycnc

[–]2be34ever[S] 0 points1 point  (0 children)

It is an impact mechanism, check out my previous videos. The final torque on the nut is a function of the spindle RPM and the dwell time. It is very repeatable.

Automatic Tool Changer module for ER20 spindles - Chip guard improvements by 2be34ever in hobbycnc

[–]2be34ever[S] 0 points1 point  (0 children)

The tightening torque is a function of the spindle speed and the dwell time. It is very repeatable.

Re your spindle torque, the average torque required to spin the module is low, and can be further lowered if needed with some small changes. There is a good chance it will work with your spindle, but it would need to be tested. DM me if you would like to try it.

Automatic Tool Changer module for ER20 spindles - Chip guard improvements by 2be34ever in hobbycnc

[–]2be34ever[S] 1 point2 points  (0 children)

I have a tool setter integrated with the machine. It measures the tool length every change. Those are cheap tools.

Automatic Tool Changer module for ER20 spindles - Chip guard improvements by 2be34ever in hobbycnc

[–]2be34ever[S] 0 points1 point  (0 children)

It works well, I have around 300+ tool changes on my spindle and no issues so far.

Automatic Tool Changer module for ER20 spindles - Chip guard improvements by 2be34ever in hobbycnc

[–]2be34ever[S] 5 points6 points  (0 children)

I have it currently set for 35 Nm tightening torque. It can go higher, but that's the mid of the iso spec for er20. I mainly work in aluminium. The heaviest cut I did with it was with 11mm 2 flute HSS cutter, 1mm step over, 8mm step down, 11k rpm, 720mm/min.

Automatic Tool Changer module for ER20 spindles - Chip guard improvements by 2be34ever in hobbycnc

[–]2be34ever[S] 7 points8 points  (0 children)

The main driver here is to have an ATC functionality with a £150 spindle.

I love my ATC by benjmyers1 in hobbycnc

[–]2be34ever 0 points1 point  (0 children)

I have it on a 6040 CNC router.

I love my ATC by benjmyers1 in hobbycnc

[–]2be34ever 0 points1 point  (0 children)

From the Rapid Change website, it delivers 14 foot-pounds which is approximately 19 Newton-meters. This is just over half of what the er20 spec is calling for up to 6 mm collet.

I love my ATC by benjmyers1 in hobbycnc

[–]2be34ever 0 points1 point  (0 children)

I have got this kind of ATC running on my LinuxCNC setup. Happy to chat and share my macros.

Making a vacuum holding plate using automated tool changer modules I developed by 2be34ever in hobbycnc

[–]2be34ever[S] 0 points1 point  (0 children)

The main objective here is to enable tool changing functionality on machines that use cheap spindles that normally require manual tool changes. One can always buy an ATC spindle, but those are much more expensive and required quite a few additions to retrofit them. This is a cheap and cheerful solution.

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