Re: [CAD_CAM_EDM_DRO] Probes

It depends a lot on the sophistication of the probe, use, and machine you
are running it on, Roland.

My Renishaw MP1s that I use on my mill needs to have the concentricity
adjusted which is a pain. So for finding an edge or center of a hole I
converted a $20 electronic edgefinder which works just as well, always
concentric (ball tip) and it easily replacable in the event of a crash.

That way I'm not risking the Renishaw, which is useful for when I need Z
overtravel.

Don't worry about breaking the probe, you can change tips with no drama. DO
be aware that some probes like the DEA and the MP1s use odd stylus threads.
you might have to buy a couple of adaptors if your stylii and probe are
different, Q-Mark sells these.

-Will

----- Original Message -----
From: "Michael Fagan" <woodworker88@...>
To: <CAD_CAM_EDM_DRO@yahoogroups.com>
Sent: Wednesday, January 13, 2010 7:53 PM
Subject: Re: [CAD_CAM_EDM_DRO] Probes


> We run Renishaw probes on all of our CNC equipment. The tips are simply
> carefully unscrewed and replaced. Since the probe has overtravel
> protection
> (nearly 0.25") as long as you're careful you can't break it. As for the
> concentricity, the Renishaw macros contain a calibration sequence which
> involves jogging the probe to the approximate center of a known concentric
> object, such as a ring gauge or a high quality bearing race. The macro
> finds the center of the ring 4 times, rotating the probe by 90 degrees
> each
> time. While the macro does this with the aid of a spindle encoder, you
> could also probably rewrite the macro to allow you to manually index the
> spindle.
>
> On Wed, Jan 13, 2010 at 14:29, Roland Jollivet
> <Roland.Jollivet@...>wrote:
>
>>
>>
>> Hi All
>>
>> Does anyone here have experience with commercial probes, like Renishaw?
>>
>> I've been looking at some designs, and what concerns me is tip-changing.
>> I can't find any documentation to explain how a device that is sensitive
>> to
>> 0.2g touching can withstand the screwing off, and in of a different tip
>> without possibly distorting the internals.
>>
>> Also, when a probe is mounted in the spindle, and although it usually
>> does
>> not turn, is the ball at the end meant to be concentric with the mill
>> spindle to within the accuracy of the probe, like less than a 1um?
>>
>> Roland
>>
>> [Non-text portions of this message have been removed]
>>
>>
>>
>
>
> [Non-text portions of this message have been removed]
>
>
>
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