"Scott" wrote in news:1108660216.069662.318640
@c13g2000cwb.googlegroups.com:

I'm new to metal working and purchased an Interapid 312B-1 dial test
indicator to help with milling setup, eg, vise alignment, finding hole
centers, edge finding, etc.

The indicator has the contact point positioned approx. 45 degrees from
vertical (pointed out toward the front of the indicator).

Was hoping someone could recommend a contact point angle setting and
how to re-position the contact point? Most of the pictures I've seen
show the contact point set at vertical. However I've noted that the
contact point for this indicator needs to be set at 12 deg. to the work
piece for accurate readings. Based on the parts diagram posted online,
the contact point apparently has a 210 deg. range of motion.

I attempted to loosen the two screws (one on each side of the housing)
that hold the contact point pivot bushing, but could not get them to
turn. Didn't want to apply additional force to loosen them until I was
sure this was the correct procedure?

Also, the indicator contact point is tapered to a point versus the
0.08" dia. ballend contact point that I believe is standard with new
indicators. Can someone please tell me which contact point is best
suited to my intended uses?


The Interapid indicator is designed to be used with the tip set at an
angle as you mentioned. To change the angle of the tip just push it. It
has a friction fit and will move after you reach the end of the travel.
There is no need to loosen anything. The contact point that came with the
indicator should be fine for what you are using it for. Carbide points
are best when you indicate over long distances all day long as they wear
better. Small diameter points are best for indicating small holes,
drills, etc. Good choice for an indicator BTW.

Dan