Re: digital protractor for faceting machine

What would be required for circuits and power supply. Would the worm
drive have a lot of backlash? any suggestions on where to start
looking for supplies

O M

--- In CAD_CAM_EDM_DRO@yahoogroups.com, "David G. LeVine"
<dlevine@...> wrote:

>
>
> >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
>
>
> --
> No virus found in this outgoing message.
> Checked by AVG Free Edition.
> Version: 7.5.446 / Virus Database: 268.18.6/709 - Release Date:

3/3/2007 8:12 AM

>