Re: [ATM] Bowed Flexure

["matt" <mariusrf@bellsouth.net>]

Don is talking about the flexure motion output as being 0.0001" for each
dial division of input travel . The dial measures the input motion, but this
is a transmission, it has a transmission ratio which could be for example
the 10:1 which is the discrepancy between what you say and what Don says. He
was just skipping some steps in the explanation .

best regards,
matt tudor

----- Original Message -----
From: "Ellen Mackenzie" <mackenzieconsulting@sympatico.ca>
To: "'Don Clement'" <clement.focuser@verizon.net>
Cc: "atm" <atm@atmlist.net>
Sent: Tuesday, January 04, 2005 5:36 PM
Subject: RE: [ATM] Bowed Flexure


I guess I'll have to go back to school - - - each division on the clock
means the small divisions between the numeric .001's - - - you might be able
to estimate to 1/2 a division .00005" but I wouldn't count on it. As the
saying goes " you watch too much TV"
By the way , I taught a pig he was a dog and all he could do was bark at
strangers.

-----Original Message-----
From: atm-bounces@atmlist.net [mailto:atm-bounces@atmlist.net] On Behalf Of
Don Clement
Sent: Tuesday, January 04, 2005 3:58 PM
To: atml
Subject: [ATM] Bowed Flexure
Importance: High


I have uploaded some more pictures that help illustrates the bowed flexure.
The first picture shows separate parts consisting of a 0.75"x1.5" spring
steel strip, ¼-40tpi screw with knurled knob, 0.5 x1 x0.75 cantilevered
flexural steel beam, and steel body.

http://photobucket.com/albums/v332/DClement/?action=view&current=BowedFlexur
eParts.jpg

The second picture shows a dial indicator mounted in the bowed flexure.

http://photobucket.com/albums/v332/DClement/?action=view&current=BowedFlexur
eClock.jpg



One revolution of the bowed flexure knob moves the indicator 0.002". Each
division of the dial indicator is 0.0001" and with very little effort, one
can repeatable position to a 1/10 division or 0.00001". Operation is
extremely smooth, stiction free , and with resolution better than my Newport
differential micrometer.



The bowed flexure is extremely simple to build and could easily be built in
the home shop. Applications are numerous for the TN. An extremely sensitive
foucault tester knife-edge movement for example.  Another application would
be for use as an optical micrometer (precise tilting of a plane parallel
glass such as microscope slide) when used as the Y-axis of a caustic tester
or for  autocollimator ultra-fine angle readout.



Don Clement

Running Springs, California

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