W20->ER32 collet holder for my Aciera F3.

[NeoTech]

A short project, i took a ER32 collet with a straight shank, and cut the shank off.. threaded the collet part with a M12 internal thread. Then turned a arbor for the Aciera that had a M12 external thread and a M8 internal thread. A bolt with a compression cone was fitted on the inside of the holder and the arbor screwed onto the holder head. The arbor was hardened and oil quenched. Final runout on the collet body 0.3mm, final runout on the tool in the holder 0.018mm... (can someone please explain this i would be glad).. Well that sorted my problem with holding endmills in the Aciera anyway.  4 hour project start to finish excluded hardening..
 

[NeoTech]

Well i hade to revisit this project.. Doing this in version one with a threaded ER32 collet onto a shank.. was waste of a good collet holder.. the runout got evident after a while.. So heres version 2..
This time around i made it out of a 45mm piece of C45E axle i had lying around. The runout is still around 0.05mm which is not terrible in my book, not good but not terrible either. The runout problem is now relocated from a thread to the actual 8 degree cone for the collets.. So that will have to be sanded by hand watching bad action movies from the 80s. (Punishment) 

Otherwise, i made a tool to cut the 45/5 degree buttress thread that is a 19.75x1.666 thead, by recalculating the gearing in my lathe after setting it to 3mm thread pitch in the gearbox and off we go. It worked like a charm, the freehand ground threading tool hit jackpot on the first attempt  , and making the thread a bit tight was better for the Aciera drawbar. 

http://www.roughedge.se/blogg/2013/03/16/w20-er32-version-2/

[philf]

Hi Neotech,

You could have a try at "fixing" the taper in-situ on the Aciera by using it as a lathe. You could clamp a boring tool in the vice (adjusted so the cutting edge is dead on centre line) and rotate the Aciera head by exactly 8 degrees.

Phil.

[NeoTech]

Sounds like a clever idea.. gonna give that try.. i can powerfeed the taper it will prob. be better than my handcranking anyway. =)