In article ,
"PrecisionmachinisT" wrote:

"Joseph Gwinn" wrote in message
...
I have a nice Helios vernier caliper that lacks only the thumbscrew that
clamps the precision adjuster.

The fine adjusted is the right-hand clamp screw that sticks up in the
upper diagram in
http://www.gagesgalore.com/Fowler/Calipers_Vernier_Selections.htm.

The screwthread appears to be M2.5-0.35mm.

Anyway, anybody have any idea where to get a replacement thumbscrew?

Thanks,

Joe Gwinn

Why not fcking make one yourself ?

sheesh....

1. My lathe is a bit large for such a small screw, and my lathe doesn't
do metric anyway.

2. The actual screws are hardened steel, so they don't mush out in use.
Typically, the threads are ground after hardening. I don't have the
equipment.

3. While I can buy a box of M2.5-0.35 machine screws, they will be
soft. Maybe one can get socket head screws that are harder. (Not clear
that socket head screws are made that small.)

3. I bet these thumbscrews cost all of $5.00 each when bought as a
repair part, and they are perfectly suited to the purpose.


Joe Gwinn