Re: [CAD_CAM_EDM_DRO] Re: Re: Limit and Homing switches

Hello Ray,
might be you misunderstood me. In the case I talk of, the cam is on the
end of the table screw while the nut and the micro switch are fixed to
the bed itself. (Typical case: Bridgeport x table) So the micro switch
will be hit by the cam only on the end of the travel. Obviously it needs
some tinkering to position the micro switch well so it does enter right
on
the ramp.
The cam may run out like a snail house up to full diameter with the
pitch ot the thread, so it will help as safe limit too. And on the other
side you put a mirror part for the limit switch.
Have a nice weekend.
Sven Peter

rehenry wrote:

>
> Alan.
>
> The moving vane has the advantage of not tripping a mechanical switch on
> each revolution of the screw or motor like a cam would.
>
> Ray
>
> > From: Alan Marconett KM6VV <KM6VV@...>
> <s>
> > Another method I have just been reminded about is to use a "vane"
> > attached to the SERVO or stepper shaft that passes through an opto
> > switch. This setup can be used somewhat like an index. Could be
> > useful on a SERVO where there isn't a motor phase, or the encoder is
> > too high resolution to use it's phases.
>
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