Proxxon collet size?

[Graham MeekParticipant @grahammeek88282]

I have tried un-successfully to obtain an ER 20 Spindle from Proxxon, so I am in the process of designing one.

In addition to the collets, I intend to fit a bayonet clamping ring to the ER 20 fitting. To hold such things as my small boring head, milling arbor, shell mills and drill chuck. All these items will use the 16 degree collet taper for location.

I will post some more details in due course, but with an operation pending at the end of the month, please bear with me as regards to the time frame.

I would also like to make a dedicated machine vice for the mill, similar in design to that used on my Emco FB2. While I have the compound table on order, (3 weeks delivery date). I would like to get on with this design in the meanwhile.

Can I impose on owners of this milling machine, to supply me with a couple of dimensions?

I would like to know, the dimensions of the spindle centre-line with reference to the back face of the milling table.

When the Y-axis is fully in, and fully out.

Thanks

Gray,

[Graham MeekParticipant @grahammeek88282]

I have had a chance to make a start on the new spindle for the Proxxon Milling Head which is shown below.

The front bearing has been increased to 15 mm diameter to make the spindle a bit more rigid without having to modify the quill housing. As this bearing is 1 mm thinner than the original a 1 mm spacer shim is required. While the bearing is rated slightly less than the original I am prepared to live with this. The manufacturer has probably over specified the bearing anyway.

All I need now are the ER 20 collets to go with the spindle. As regards the associated tooling for this spindle that will now have to wait for a few weeks.

Regards

Gray,

[Author]

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