RE: [CAD_CAM_EDM_DRO] Re:Home Switches

Do you have a good source for these roller lever switches?



-----Original Message-----
From: John Johnson [mailto:johnatl@...]
Sent: Sunday, January 11, 2004 10:44 AM
To: CAD_CAM_EDM_DRO@yahoogroups.com
Subject: Re: [CAD_CAM_EDM_DRO] Re:Home Switches

Could be backlash in the axis. You can check it with a dial indicator.
Also look for chips/dust on the microswitch lever and whatever actuates
it. I can repeatedly home my home-made router and get variances of less
than 0.001". I use roller lever microswitches.

Regards,
JJ

On Saturday, January 10, 2004, at 11:15 PM, Dave Fisher wrote:

> On fitting home switches to our router table, I notice that each time
> I home the table - the X and Y readings differ greatly, some times
> upto + -
> 0.5 mm. Seldom never going to zero. Slowing the home traverse speed
> seems to
> make little difference.
>
> I would have expected there to be some differnces caused by backlash
> etc but
> not as much as I am getting.
>
> I have used good quality lever type micro switches, but wonder if I am
> suffering from switch bounce or just the mechanical properties of a
> micro
> switch. Would I be better using a slotted opto coupler to eliminate
> mechanical tolerences or any other method ?
>
> The table is being driven with Rutex Amps and The Desk CNC sofware and
> controller.
>
> Any advice would be appreciated
>
> Rgds to all
>
> Dave Fisher
>
>
>
>
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[Moderators]
URL to this group: http://groups.yahoo.com/group/CAD_CAM_EDM_DRO

OFF Topic POSTS: General Machining
If you wish to post on unlimited OT subjects goto:
aol://5863:126/rec.crafts.metalworking or go thru Google.com to reach it
if you have trouble.
http://www.metalworking.com/news_servers.html

http://groups.yahoo.com/group/jobshophomeshop I consider this to be a
sister site to the CCED group, as many of the same members are there,
for OT subjects, that are not allowed on the CCED list.

NOTICE: ALL POSTINGS TO THIS GROUP BECOME PUBLIC DOMAIN BY POSTING THEM.
DON'T POST IF YOU CAN NOT ACCEPT THIS.....NO EXCEPTIONS........
bill
List Mom
List Owner



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