Re: [ATM] Building Foucault tester

[Mike Lockwood <melockwo@uiuc.edu>]

Bob,

Bob May wrote:
> Mike, a nice set of easily made testers!

Thanks!
One of these days I will figure out an easily made Caustic tester....

> The only error in making them is that the T nuts should be placed
> so that the forces on them push them into the wood rather than pull
> them out of the holes.  The #2 tester shows that the nut for the
> nut is on the wrong side of the hole.   Rather than being on the
> knob end, it should be on the platfrom end of the hole.

It's not an error, it's a feature.  Really!

Actually, there are T-nuts on BOTH sides of the wood for BOTH
adjustment knobs.  This nearly eliminates slop, and keeps the threaded
rod from wobbling, making fine adjustments smoother and easier.

With a little adjustment of the distance between the T-nuts (done with
a hammer or C-clamp) one can get the rod to thread through.

> BTW, nice knobs using some plastic asters!

The forward-back KE adjustment on tester 2 is indeed a plastic "cup"
to put under furniture legs to protect the floor.  The lateral KE 
adjustment knob is a 2" PVC pipe cap.  Both were on hand the evening I 
built that tester.

The second tester was cheaper and built faster, but it is my favorite 
tester now because the blunt KE works better than a razor blade, and 
is less dangerous.

	Mike Lockwood


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