Re: [ATM] LWT setup questions

["Don Clement" <clement.focuser@verizon.net>]

Hi Bernard,

In message <000b01c55b3c$c21fda80$6401a8c0@hugo>,
 "Don Clement" <clement.focuser@verizon.net> wrote:

>> Bernard,
> >
>> IIR, wayback in the early 70's in the "Gleanings for ATM"  S&T monthly
>> column, there was a description of a caustic tester that used a simple
>> method of making precision Y-axis measurements without the need for a
>> precision Y-axis mechanical stage. The Y-axis measurement was made by  a
>> pivoted  plane parallel refractive element using a standard micrometer
head
>> to precisely position the Y-axis image.

> Thanks for the tip. Nothing at hand though coming close to that.
> Regards,
> Bernard


The article was in May 1973, " An Easily Constructed Caustic Tester" by J.
F. Kielkopf
The beauty of Kielkopf's tester was the ease of building the very high
precision caustic (LWT) Y-axis with materials that amateurs would have on
hand. A common microscope slide could be used as the refractive plane
parallel refractive element for example. Also the pivot could be a compliant
flexure hinge for the highest accuracy and smoothest type movement. Perhaps
a stiction-free flexural hinge made from a single piece spring steel. Add a
cheap Chi-com ball-end micrometer head and the Y-axis would rival any piece
of expensive metrology gear made from expensive precision slides. (The very
best metrology tools and semiconductor manufacturing  equipment  use
compliant flexural mechanisms for the most precise movement anyway!)

Don Clement
Running Springs, California

In message <000b01c55b3c$c21fda80$6401a8c0@hugo>,
 "Don Clement" <clement.focuser@verizon.net> wrote:

>> Bernard,
> >
>> IIR, wayback in the early 70's in the "Gleanings for ATM"  S&T monthly
>> column, there was a description of a caustic tester that used a simple
>> method of making precision Y-axis measurements without the need for a
>> precision Y-axis mechanical stage. The Y-axis measurement was made by  a
>> pivoted  plane parallel refractive element using a standard micrometer
head
>> to precisely position the Y-axis image.

> Thanks for the tip. Nothing at hand though coming close to that.


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