Re: [CAD_CAM_EDM_DRO] digital protractor for faceting machine

>I am a new member here and am trying to find information of how to
>build a digital protractor for a faceting machine. Had information
>form a site that used a carbon trim pot, but the site has gone black.
>from a search of this site I also see information on rotary encoders.

How fine do you want it to be? The easy way is to buy a 360 line
encoder and do 4 count quadrature multiplication on the outputs which
will give you a 15 minute resolution. Of course you could build a
129,600 line pair unit with 4 count quadrature multiplication on the
outputs and get 1 second of resolution. It isn't ever cheap!

Most find that a worm setup with a cheaper encoder is a good
compromise. A 36:1 worm drive is not hard to do, that means that
each turn of the worm is 10 degrees on the gear. A 600 line encoder
gives 1/4 minute (15 seconds) resolution, a 3,600 line encoder gives
1/4 second. I would bet that you don't need more than 1 second
resolution (about 1" at 100 yards.)


David G. LeVine
Nashua, NH 03060


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