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Author Topic: Index switch / limit switch  (Read 6947 times)

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Offline TRX

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Re: Index switch / limit switch
« Reply #10 on: May 23, 2009, 04:05:51 AM »
 Laser?  Do you have pictures of this somewhere?  Commentary?

 Of all the work it took to do my CNC conversion, the limit switches were the biggest pain in the posterior, and I have this bad feeling that they're going to be a problem eventually...

Offline jimpinder

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Re: Index switch / limit switch
« Reply #11 on: May 25, 2009, 04:27:56 AM »
The two laser modules, which are 2 inches long and 1/2 inch dismater (certainly less that that) run off a 5 volt supply. You can get tham fitted with lenses to give amore focused output. I got mine from Maplin (UK firm) at £10 each. The dtectors are three wire Schmidt trigger devices, giving an instantaneous change fro 5 to 0 v if hit by a laser beam. They drive TTL and CMOS directly.

I have my lasers mounted on the table shining onto detectors mounted on the lathe body. There is no physical contact between the two, indeed, they with work over a long distance if required.

Excellent, repeatable results, to less than 2/100ths of a mm.
Not me driving the engine - I'm better looking.