A bit of prep work today making a backup RA gear for the homemade
GEM.
I faced both sides for the clutch pressure plates, cut the pre-hob radius groove,
and finally bored out the centre to interference fit the RA axis.
The blank is now ready on the spindle. Next to do is the new ACME worm and hob.
This gear hopefully will try and address the main errors which have shown up
in this entire project....which are quite minimal considering how the gears
have been hobbed with a self indexing etc.
I think I can deal with both of the main PE contributors by the sequence
that I do things this time and an idea I will try with self indexing.
I will also try some mathematics this time and see if I can target a predetermined
number of teeth on the worm gear
With luck this will be the working gear (with a better PE) and the current
one will be a backup should tragedy strike
Also attached is a beautiful set of MFM hard drive heads showing a
set of 6 roller bearings (4 visible in the shot).
Nice working parts for a Crayford focuser guts
Steve