Re: [CAD_CAM_EDM_DRO] Re: My Logan Clunker & leadscrew compensation

Hi Jack:
Have you considered having the bed reground?
Seems to me that this would be the best, and maybe even the cheapest
solution.
Patching it up with complicated compensating mechanisms is going to be a
dog's breakfast no matter how you approach it.
Either junk the machine, or fix it properly.
You'll be much happier!!!
Cheers

Marcus
-----Original Message-----
From: jmw@... <jmw@...>
To: CAD_CAM_EDM_DRO@yahoogroups.com <CAD_CAM_EDM_DRO@yahoogroups.com>
Date: Wednesday, May 16, 2001 11:34 AM
Subject: [CAD_CAM_EDM_DRO] Re: My Logan Clunker & leadscrew compensation

>Doug,Jon,Ballendo:
>
>Thanks very much for your insights. The expertise displayed in the
>group continues to amaze.
>
>I think my Logan spent a good deal of its life making the same part,
>perhaps using a toolpost grinder. The machine arrived at my doorstep
>wearing a heavy coat of grinding dust. A dial indicator positioned on
>the saddle and reading the top of the front v-way yielded some tap-
>the-gage-I-don't-think-it's-working readings.
>
>Not being an EMC programmer it's easy to think a software solution
>would be "easy." It would seem possible to implement this type of
>error correction as a piecewise linear transform of the output
>coordinate system. Presumably this could be layered on pretty close
>to the surface of the control program. Some coding guidance might be
>provided by the methods used to implement the leadscrew correction in
>EMC.
>
>I hadn't thought of a cam-operated system based on the same principle
>of operation as a taper attachment. That could be made to work.
>
>Jon, any chance that you could post a picture to your website or the
>cced archives of the setup you described ?
>
>There's another mechanical problem associated with worn v-ways. If
>the carriage is adjusted to be a nice sliding fit on the unworn
>areas, it's sloppy on the worn spots etc. I can imagine a smart
>electro-mechanical adjuster, but I don't immediately see a practical
>solution to this problem.
>
>Thanks again.
>
>--Jack
>
>
>
>
>
>
>
>
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