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Chapter 11 Diagonal Measurements
Assembling the Interferometer, Post, Base and Clamp
Assembling the Interferometer, Post, Base
and Clamp
If you are using the right-angle clamp in a post-and-base setup for
mounting your interferometer (on the beam steering arm), align the clamp
so its long edge is parallel to the edge of the base. This will make
alignment of the interferometer to the XY diagonal of the measurement
easier. Refer to Figure 11-8.
1
Assemble and tighten the post(s) and base.
2
Slide the right-angle clamp onto the post. Do not tighten the clamp at this
time.
3
Tip the assembly on its side on a flat surface so the long edge of the base
and the long edge of the clamp are both resting flatly on the surface. You
may have to let the top of the post extend beyond the edge of the surface in
order to be able to do this.
4
Position the clamp so it is about 11.5 cm (4.5 inches) above the base, then
tighten the clamp to the post.
5
To reduce problems due to vibration and other causes, install the beam
steering arm, with the interferometer attached, as close as possible to the
right-angle clamp. Insert and clamp a post through the horizontal hole in
the right-angle clamp, then fasten the beam-steering arm to it, using one
M10 setscrew in the arm. At this time, tighten the setscrew just snugly,
not tightly, so the arm can rotate about the post.
For greatest mounting stability, use only one setscrew to hold the arm to
the post; this forces the post to the opposite side of the hole, providing
three-point stability. The two setscrew holes are provided for improved
flexibility and ease of use. For improved mounting stability, the hole for
the post is not circular, but widened along the line of the setscrew holes; to
see this, put a post in the hole. Using two setscrews—one in each hole—is
likely to result in a less-stable setup, because the arm and post would
have only two contact points instead of three, and the post could pivot
around the axis of the setscrews.
Measurements Reference Guide
11-17
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