We have an LPKF circuit board milling machine with
automatic tool change.  The tools are lined up in a row in
spring loaded holders, and have some means of gripping the
collet nut while slowly rotating the spindle to tighten or
loosen the nut (at least that is how it appears to work).
I haven't disassembled it to verify my guess on its operation,
but I do know there is no through-spindle mechanism for
releasing the tool.  Some kind of similar system might work
for your ER20 collets.

-- Ralph
________________________________________
From: Viesturs Lācis [viesturs.la...@gmail.com]
Sent: Monday, June 10, 2013 3:49 PM
To: Enhanced Machine Controller (EMC)
Subject: [Emc-users] Upgrade to ATC

Hello!

I built a wood router a while ago and now I am asked to provide an offer to
implement automatic tool change on that machine.

Currently it has spindle motor with ER20 collet at the end of motor shaft.
I searched the web for some kind of upgrade kits, but all I could find was
for Kress motors.

I would appreciate, if anyone could share some information, where could I
look for some solution.

--
Viesturs

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