Proxxon Ff400

[Leocricia Castellanos]

Ithink the Proxxon collets are a special design, you have to engage the collet in the nut before you tighten it in the spindle. Conversely if it doesnt disengage on loosening you have to jiggle it a bit until you can remove it from the tightening nut. I hope this is clear but I dont know the correct terms to describe this. I have a Proxxon FF230 (notmy choice) and I know if the collet is not properly engaged it will move in use.

Thanks for dimensional description Barrie, Saves irritant squabbling. Probably a dimensioned drawing of all ER size collets, there seems to be for all other types, Crawford Etc.. And part of design is that ER collets are supposed to be self extracting. We all seem to have lost a great mentor.

Thanks everyone for all your research, I did eventually find a US chart that lists the exact dimensions of er collets. Previously I thought it might be er20, however another site had a table which suggested it was er16.

Having done some measurements from one of the genuine proxxon collets they are as follows: 4 Deg taper, 27.06mm height, 18.24mm diameter (widest point). However as others have said it is a non standard size and not an 'er' collet.

In an attempt to add more confusion. The FF/PF 400 (FF was freestanding, PF mounted on the back of the PD 400 lathe) appear to have had two types of collet. The early one looks a bit like an OZ but I think was a Proxxon own design is shown here as part number 24252.

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