Re: [CAD_CAM_EDM_DRO] Pulley/belt to use on an tachometers.

Alan Hantke wrote:

> Seeing as there was a thread recently on tachometers, I thought this might be an appropriate topice too...
>
> Awhile ago I bought some nice little motor/tachs (Jon's recommendation really) from one of the surplus houses.
> I don't have the unit in front of me, but it has a small little shaft similar to a slot car motor's shaft (probably a 1/16th of an inch or so out of memory). The question I have is what is the best way to connect the tachometers to the leadscrew? I don't know where to find an appropriate pulley that has such a small hole for the shaft. Clearly the tachometer does not have any torque on it, and that means (I think) a fairly simple connection method should work.... maybe even one of those rubber band type belts? Any help or suggestions would be appreciated. Furthermore, if you have source information that is even better.
>
> FYI, I don't remember exactly where I got the tachs off the top of my head. It was from the place that sends
> out a catalog which is printed on newsprint. If anyone has a dying desire to know, please contact me off-list
> and I'll find out when I get home (or Jon Elson may be able to chime in if he recalls).

Herbach & Rademan ( http://www.herbach.com/ ), but I can't say they have
any more. It was a small Escap motor. The shaft is likely to be 3 mm, a bit
shy of 1/8 ". I used metal sprockets from WM Berg, and one of their mini
steel-cable molded belts. The sprockets are Part # 32D3-40, the belts were
33GBF-80 (although you might need a different length).

Jon