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In a message dated 05/05/2000 7:33:29 AM Hawaiian Standard Time, 
mmueller@... writes:

<< So has anyone built one that would be fairly accurate in the .001"
 to .0005" range.
    My parts are normally in the envelope of no bigger than 18" x 18" x
 18". >>

Ironically, Your CMM and a gantry mill big enough to do a 18 inch cube would 
have to be very massive and rigid to hold .0005". I think a more realistic 
range would be +- .002. I have tried to probe on a 3 axis DRO equipped 
Bridgeport. Not really good for more than a few dozen hits. Talk about 
cranking. The neatest system I've used is a Renishaw probe used as a joy 
stick. By grabbing the probe, one drags the stylus over the part. The cnc 
floats the gantry over the part as though you were moving a manual machine. 
Of course, it is recording position info as you go. If this system could be 
duplicated in a lower (much lower) cost version, you could build a medium 
duty gantry mill / CMM combo machine.  Kill two birds with one stone. 

   Just a thought.

Peter
THRD, Inc.

Mike Mueller

#7486

For both personal and very limited work use (once a month) ,
	 I'd like to have a CMM, but due to cost it is not feasible to have
a "real" CMM
	(Coordinate Measuring Machine)
	So has anyone built one that would be fairly accurate in the .001"
to .0005" range.
	My parts are normally in the envelope of no bigger than 18" x 18" x
18".
      I'm also in the planning stages of building a 4-axis DRO on my 3-in-1 
      using the board kit from Camtronics, so if I could some how use the
same computer and 
	modified software that would be great. Am I asking for too much ?



	Thanks,
	Mike Mueller
	Antioch, CA

Ray Henry

#7499

Peter

Sounds like a job for the second generation babyhex.  

Ray

Show quoted text

  Date: Fri, 5 May 2000 13:58:42 EDT
  From: ptengin@...
Subject: Re: DIY CMM ??

In a message dated 05/05/2000 7:33:29 AM Hawaiian Standard Time, 
mmueller@... writes:

<< So has anyone built one that would be fairly accurate in the .001"
to .0005" range.
   My parts are normally in the envelope of no bigger than 18" x 18" x
18". >>

Ironically, Your CMM and a gantry mill big enough to do a 18 inch cube would 
have to be very massive and rigid to hold .0005". I think a more realistic 
range would be +- .002. I have tried to probe on a 3 axis DRO equipped 
Bridgeport. Not really good for more than a few dozen hits. Talk about 
cranking. The neatest system I've used is a Renishaw probe used as a joy 
stick. By grabbing the probe, one drags the stylus over the part. The cnc 
floats the gantry over the part as though you were moving a manual machine. 
Of course, it is recording position info as you go. If this system could be 
duplicated in a lower (much lower) cost version, you could build a medium 
duty gantry mill / CMM combo machine.  Kill two birds with one stone. 

  Just a thought.

Peter
THRD, Inc.

#7508

I am also building a DRO setup(for my & X 10 mini lathe). I am 
wondering if anyone has programed Tom's DRO in visual basic. I am not 
even sure if it is possable in VB. I would like to make a GUI spcific 
to my lathe. Settings for the toolpost angle, postion for the saddle 
and crosslides. The ability to enter the as cut size, desired 
size....etc.

Any help out there?

Thanks Jeff 

      I'm also in the planning stages of building a 4-axis DRO on my 3-in-1 
      using the board kit from Camtronics, so if I could some how use the
same computer and 
	modified software that would be great. Am I asking for too much ?



	Thanks,
	Mike Mueller
	Antioch, CA

开云体育

DIY CMM ??