Re: [CAD_CAM_EDM_DRO] Limit and Homing switches Over 2200 members today

Hi Bill,

Small lever switches like Microswitch are available surplus, they are
fine for limits. They may not be repeatable enough for limit switches.
Optical switches (optical interrupter) are fairly small also, look like
a 'U' with feet. A thin blade passes through the 'U', and actuates the
switch. Normally they are TTL output, which is easy to use, but you
can't "daisy chain" them. Optical switches can be found on HP laser
printers ;>) and floppy disk drives. They can be quite accurate for
home position, if their output is AND'ed with a phase of an encoder or
stepper motor phase. TTL logic should be fine for this.

Congrats on the 2200++ members!

Alan KM6VV
Need Pix?

wanliker@... wrote:

>
> I am converting an EMCO COMPACT 5PC lathe to more modern drives, G-320, with
> servos, instead of the old steppers.
> I have now come to the part where i have to think about Limit, and Home
> switches.
> Has anyone on the list got the answers to what I should use. This is a 5 x
> 12 lathe so something bit would be very hard to mount and use.
>
> So any suggestions, and part numbers would be welcome, with the emphasis on
> small, being a high priority.
>
> I have noticed on several surplus, (not lathes,) that they are using optical
> switches, any comment on repeatability and how to tie them into the system?
>
> Help,
> bill