RE: [CAD_CAM_EDM_DRO] Re: Limit switches revisited

:-) The link I gave is to a file transfer area. Some kind soul deleted the
files...
You can see it here:
http://www.caswa.com/Homing.mov

The prox probes are Allen-Bradley 872C-D2NP8-P3 C
It's only 8mm in diameter, has a nickel plated brass body, and a pnp output.
I've used other types of small proxes before for this and they work fairly
well. Proximity probes appear regularly on ebay.

PK
-----Original Message-----
From: CAD_CAM_EDM_DRO@yahoogroups.com
[mailto:CAD_CAM_EDM_DRO@yahoogroups.com] On Behalf Of yet_another_kent
Sent: Thursday, 17 November 2005 6:17 AM
To: CAD_CAM_EDM_DRO@yahoogroups.com
Subject: [CAD_CAM_EDM_DRO] Re: Limit switches revisited

Paul:

This is awesome, firstly because you took the time to do it, secondly
because you took the trouble to make and upload a video, and thirdly,
because of your result. I thank you.

A micron is a micrometer, so your 90-percent confidence interval is 2
micron x 0.00003937 inch/micron or about 0.08 mils for us
"Imperialists" (I'm only talking units here, not politics). I had a
misguided notion that proximity sensors aren't nearly that good. I
would be happy with a 0.5 mil interval, so clearly proximity sensors
like yours would do.

Regretably, I don't seem to be able to access your video---clicking on
the caswa link takes me to an upload function. Can I ask which
proximity sensors you are using?

I'm just getting into the CNC game, so I don't even know what it is I
don't know, but I wouldn't expect a controller (EMC in my case) to
seek home position at top speed. Even if it did, I'm talking about a
small CNC mill rather than a CNC router and I don't expect very
impressive rapids, certainly nothing like 8m/min.

Regards,
Kent

--- In CAD_CAM_EDM_DRO@yahoogroups.com, "Paul Kelly" <tech@c...> wrote:
>
> For completeness I did some tests today with the proximity sensors
as home
> switches.
> There's a fairly large video here http://www.caswa.com/dropbox
> That shows the prox probes installed and operating. In every
configuration
> the system homed to within 5 microns and I only had two of those
errors. I'd
> say 90% of the time it homed to within 2 micron.
> The proxes I'm using have a 2mm sensing range. Probably not enough
room to
> decelerate from an 8m/min rapid.
>
> PK






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