Material tolerance variation in thickness and how to overcome...

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  1. #1
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    Default Material tolerance variation in thickness and how to overcome...

    Hey folks - this is driving me to distraction so hopefully someone can help out.

    I'm trying to 'photo engrave' a piece of granite. The main issue is that it requires a very shallow cut - say 0.1mm or less. If there's variance of 0.5-1mm over the entire piece there's some obvious problems arising.

    There's a few simple - and some quite old - machines that seem to handle this with no problems. Two machines are a GALEKS and GRANITOGRAV - the ones with the angled Z axis. I'm guessing that the angle just makes it a cheaper machine to make as there's no z screw involved.

    The Z zero of these machines is set at 1mm. They have a tolerance of 1 to 2 mm in machining depth.

    So - two questions I suppose...

    1. How do I overcome the tolerance issue?
    2. How do the angled Zaxis machine get such good results?

    Cheers.

    Paolo

    Similar Threads:
    Last edited by paolo6969; 01-31-2018 at 04:48 PM. Reason: edit


  2. #2
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    Default Re: Variation in material thickness and how to overcome...

    Do a search for "auto leveling" and see if the same tricks used for cutting PCB boards would help in your case. It starts with a surface map generated by a touch probe.

    Here is an example http://www.cnczone.com/forums/linuxc...are-forum.html

    Steve

    Last edited by steve323; 01-31-2018 at 03:19 PM. Reason: cleaned up double posted text


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    Default Re: Variation in material thickness and how to overcome...

    That does look interesting but will have to file it in the library for later.

    I'm using a Roland/Techsoft machine so kind of locked into the proprietary control software - no Gcode or Mach3 for me



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Material tolerance variation in thickness and how to overcome...

Material tolerance variation in thickness and how to overcome...