ATC module for ER20 spindles

**Daz** · 2 Days Ago

I have done some more digging and since it is a DC motor, you will have completely different torque curve, with some significant torque available from the start. Theoretically many times higher to what I can get on my 2.2kw spindle at very low RPM, assuming your spindle DC power supply can handle it, it might actually work!

You would need to sort out the manual speed control and the reverse operation, but other than that, it should work.

**JohnHaine** · 10 Hours Ago

Thanks for the extra information Daz. If the motor could generate the torque it would need a very different controller, the current one is KBE thermistor type. Something that would generate stall current at low volts would be needed, and anyway as it's a PM motor it might be field limited. Also the height would severely restrict me and my table is only 125mm wide! Shame it's a very nice concept.

**magicniner** · 8 Hours Ago

That's as cool as a Hippy Penguin's Jesus Sandals!

**magicniner** · 8 Hours Ago

Originally Posted by JohnHaine

Thanks for the extra information Daz. If the motor could generate the torque it would need a very different controller, the current one is KBE thermistor type. Something that would generate stall current at low volts would be needed, and anyway as it's a PM motor it might be field limited. Also the height would severely restrict me and my table is only 125mm wide! Shame it's a very nice concept.

The whole point of an Impact Driver Mechanism is that it isn't reliant on motor torque, it releases the drive in response to pre-settable torque demand, allowing the spindle to accelerate, it then uses spindle system angular momentum against a braking mass to apply the required torque, repeatedly.

**Lee Roberts** · 4 Hours Ago

Very cool!

Cant wait to see your first cassette of tooling in play and in production

**Daz** · 4 Hours Ago

Originally Posted by Lee Roberts

Very cool!

Cant wait to see your first cassette of tooling in play and in production

Here is my first job using the ATC modules. The cover needs some improvements to keep the collets clean.

https://youtu.be/FH3Ue6h8MHE?si=oE4Sxmk5fvD7b8i3