Re: [CAD_CAM_EDM_DRO] HF micro mill (part no. 47158) suitability for CNC

On Tue, 14 Oct 2003, Chris Cowley wrote:

> i really like your conversion. nice machine.

Thanks!

> haven't had much time to work on it. but i got the X stiction down from
> 85.30 in/oz to 17.44in/oz, Y did not give up nearly as much. started at
> 34.34in/oz down to 33.28in/oz. bearings should help considerably..

They will. The critical thing is the alignment of the leadscrews with the
anti-backlash nuts under the table. If it isn't exactly right the
friction goes way up.

> those motor mounts are quite impressive, did you cast them? or hog em
> out of square bar? or are they something off the shelf?

Actually they are hacked out of these wierd assemblies I found on ebay.
The assemblies come with a motor, encoder, helical coupler, short
ballscrew (too short for much of anything), doule row bearing, a tubular
housing and some other bits and pieces. For how much they cost they are a
steal.

> belt drive is high on the list too. you wouldn't happen to have a
> drawing of those pulleys?

No I don't. I just kinda winged those. I ground a form tool to match the
size and shape of the belt and just plunged straight in on the lathe. It
screamed and chattered like crazy but it worked.

> im planing to draw up the whole machine in cad before i do anything
> else. i need the practice and it should be a good exercise.

Wow! That would be a cool thing to have in the files section if you feel
so inclined! <hint> <hint> :)

C|