Milling A Gib Strip

[Ulma Doctor]

G'day mate'
you could do that Sav,
but there will a lot be interrupted cutting and the surface finish will suffer
you could always run it through a few times taking very light cuts.
increasing the cutter speed for the last spring cut (if possible) would help out too!
then finish by wet lapping with some fine grit paper on a sheet of modern glass
there are many ways to skin a cat, i'm sure you'll invent something that works for you

 

[4GSR]

Give it a try.

 

[turnitupper]

Rip a piece of 3x2 or whatever, hardwood at 60 degrees. Cut a rebate slightly smaller than your gib and use a piece of metal screwed into the wood to clamp it in place.
Bolt wood to mill table and go for it!. In this application it does not have to be within a second of angle, although judging by your telescope project, you might accept nothing less.
John.