Re: [CAD_CAM_EDM_DRO] Tach

Chuck Meckem wrote:

> Can anybody recomend a good Tach for spindle speed. Would like
> to mount to machine.

archie wrote:

>
> I am looking myself... I have found A DITAK - 5 Made By Red Lion
> 717-767-6511 let me know if you find anything.

I am currently building this $40 TachJR 4 digit LED kit :
http://dsgnspec.0catch.com/Tachjr.html

It is an optical emitter/sensor arrangement that works at a
distance of 4-6 inches from reflector tape on the spindle and
outputs readings from 15rpm-100K rpm.

My plan is to wrap the reflector tape around 50% of the spindle
so as to get a nice long pulse that won't get missed (because after
amplification I intend to pass it on to the PC as the source for
the spindle index pulse), hence kill two birds with one stone
(ie rpm readout and source for index pulse).

Current programs which read this spindle index pulse can update
the spindle position and rpm once per revolution (ie for tapping or
threading).

However the purpose of 50% tape (ie 180 degrees) is: in the future
the software can notice both the Hi-going AND Lo-going signal, and
hence update spindle position and rpm TWICE per revolution.

I have the kit, it looks good, it will run from +5V from the PC,
just haven't had time to solder it together yet, maybe tomorrow....

Doug Fortune
http://www.cncKITS.com
















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