I would suggest checking to see if the tailstock spindle was
parallel to the bed, and if it is, make an adjustable chuck mount
similar to the ones sold by Sherline for their lathes.? By using
an adjustable collet holder in the tailstock of my Sherline, I can
spot a shaft with a? 1mm carbide bit and then drill a .006 hole in
the end of it using Harbor freight circuit board drills without
breaking a drill.
On 11/3/24 00:43, Peter Brooks wrote:
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I¡¯ve not come across the Unimat 4 before but it looks very
much like a red U3!
?
Two dead centres, one in each of the holes in the headstock
and tailstock spindles would check whether these shafts are
aligned at the point of exit¡
?
What was holding your centre drill? Presumably a drill chuck
or collet. Have you checked that for eccentricity?
Is the bed bent or twisted - or being twisted by being fastened
down to a base board? (I use some birch ply under each end of
the bed to avoid the middle support grounding on the wooden
baseboard and potentially bending the bed).
?
Just some ideas to check¡ I can¡¯t imagine how you would true
up the tailstock casting. Would a U3 one fit? I have no idea.
The bed looks to have the same profile from photos.
