Class of Fits: RC

Emilio, if I was to make that adapter I would bore it instead of ream it. With a sharp solid Micro 100 carbide boring bar, hitting a half-thou should not be a major issue. You would have straight walls, a clean flat bottom and a very good finish as well. Even if you did use a reamer, you would need to bore the hole straight first so why not just bore it?

I would opt for 6-32 set screws - more than enough wall thickness to obtain adequate strength for that screw diameter. The only issue is cleaning up the burrs in the bore after drilling and tapping so I would rough out the bore, drill and tap the holes, then indicate the work piece in the 4 jaw and bring the bore to final size. If you work carefully, this should be a simple project.
 
Mikey, That is a very good way to go.
Thank you and thanks to all who replied. Much appreciated.
Now let me go shopping for Micro 100 boring bars.
 
EmilioG said:
Mikey, That is a very good way to go.
Thank you and thanks to all who replied. Much appreciated.
Now let me go shopping for Micro 100 boring bars.
Click to expand...

Try to find a positive lead bar. They are better for flat bottom bores.
 
Which tool holder would you recommend? From Micro 100?
 
I would just get a solid carbide bar with a positive lead that will fit in the hole and still clear chips. Most of their small bars have 3/16" diameter shanks.
 
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