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Thread: CNC egg shell carving

  1. #13
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    Default Re: CNC egg shell carving

    inimitable -



    www.signtorch.com


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    Default Re: CNC egg shell carving

    Hey uvvvw,

    I've been wondering all day, how do you account for inconsistencies in different eggs? I'm sure that various eggs are shaped a bit different than others.

    -John



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    Default Re: CNC egg shell carving

    Quote Originally Posted by JohnReierson View Post
    Hey uvvvw,

    I've been wondering all day, how do you account for inconsistencies in different eggs? I'm sure that various eggs are shaped a bit different than others.

    -John

    Hi John,
    The profiles of different eggs are indeed very different.
    I have to scan the profile of each egg before the engraving.
    I scan the profile of the egg through a mechanical probe, and get the point cloud file of the egg profile.
    This point cloud file can be imported to the 3D software and then merged with the pattern that is going to be engraved.
    But this method is not that efficient.
    I wrote my program for this merge. And it is much more efficient.

    The depth measurement and the cutting depth accuracy is extremely crucial,
    especially for the character inscription.
    If the inscription is too shallow, the character will be not clear.
    If the inscription is too deep the egg shell between the character strokes will be damaged.
    Like this one.

    CNC egg shell carving-e12-3-jpg



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    Default Re: CNC egg shell carving

    I must say again, that is very impressive. Far above my current skill level without a doubt.

    Do you use a different machine for the probing, or mount the mechanical probe directly in the machine?

    Thanks for posting all these great pictures, the extra explanations are just icing on the cake.

    -John



  5. #17
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    Default Re: CNC egg shell carving

    Quote Originally Posted by JohnReierson View Post
    Do you use a different machine for the probing, or mount the mechanical probe directly in the machine?
    -John
    Hi John,
    I mount the mechanical probe directly in the machine.
    And after the scanning, I replace the probe with the spindle.
    As the depth control is crucial, it is not OK to scan the egg profile in other machine.

    Regards



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    Default Re: CNC egg shell carving

    Can you post pics of your machine including with probing and spindle? I just curious how big or what machine looklike. Thanks.



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    Default Re: CNC egg shell carving

    Quote Originally Posted by asuratman View Post
    Can you post pics of your machine including with probing and spindle? I just curious how big or what machine looklike. Thanks.
    Done.

    CNC egg shell carving-p3380561-jpg



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    Default Re: CNC egg shell carving

    Just a warning: as long as you keep answering questions, I'm going to continue asking them. lol.

    Based on the picture the probe and spindle mount appear to be 3d printed?
    Is the rotational axis that drives the spindle driven by a worm gear?
    What made you decide to build this machine?

    I only have experience running a simple lathe or mill cnc: Is it harder to program this machine due to the two rotational axes (specifically the one that moves the spindle)? Are you running Mach3? If so, was it hard to set up the rotational axis to work on a cartesian coordinate system?

    These last questions are because at 5 a.m. when I couldn't sleep, I was thinking of building a SCARA 3d printer, but I have no idea how I would program it to work. I am much better with mechanical thingamajigs than electronical thingamajigs.

    I have never been so interested in eggs in my life. Except when hatching baby pythons.

    -John



  9. #21
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    Default Re: CNC egg shell carving

    [QUOTE=JohnReierson;1834592]

    Based on the picture the probe and spindle mount appear to be 3d printed?
    [It is nylon, turned by a lathe. Tried before 3D printing, but the concentricity is not good.]

    Is the rotational axis that drives the spindle driven by a worm gear?
    [Yes originally. But changed to other gear drive with less backlash.]

    What made you decide to build this machine?
    [Just for fun originally. Right now making a bigger one for Ostrich egg shell. Try to develop some business opportunity ]


    I only have experience running a simple lathe or mill cnc: Is it harder to program this machine due to the two rotational axes (specifically the one that moves the spindle)? Are you running Mach3? If so, was it hard to set up the rotational axis to work on a cartesian coordinate system?
    [I am using Mach2. I just cheat the system that I am working on 3 linear axis, that are X,Y and Z axis. Experience in CNC milling is more than sufficient]

    I was thinking of building a SCARA 3d printer, but I have no idea how I would program it to work.
    [Tons of learning materials in the net. Just spare some time for it will be OK ]



  10. #22
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    Default Re: CNC egg shell carving

    Hi I am interested in what software you used to do the probing
    I just tested 4th axis probemaster in mach3
    and I am a little confused because the data created is in x,y,z which is fine, but there is rotational data
    so when I import the data into Mastercam it comes in with all lines in the same plane.



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    Default Re: CNC egg shell carving

    Quote Originally Posted by squirrel_41 View Post
    Hi I am interested in what software you used to do the probing
    I just tested 4th axis probemaster in mach3
    and I am a little confused because the data created is in x,y,z which is fine, but there is rotational data
    so when I import the data into Mastercam it comes in with all lines in the same plane.
    Hi Squirrel,
    Got no idea on the Mach3 probemaster, as I am still using the old Mach2.
    And I wrote my own program to do the probing, used the old Visual Basic 6



  12. #24
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    Default Re: CNC egg shell carving

    Okay I can do do the programing but I need to be pointed in the right direction
    the 4th axis probemaster returns all values for y as 0
    So for all intents this is the same as a "single line 2d surface probe" moving only in the x direction with a z height
    So if Y was converted to a value equal to the 4th axis rotation in a flat plane the data should represent a undulating 2d surface that I should be able to roll 360 Degrees.
    ???.

    Or can I get a copy of your probe routine.
    Cheer's.

    Okay I think I have a simple fix I'll create a program to rotate all data at X degrees a round the rotary axis.

    Okay I built a macro in Mach3 that does all the conversion works real good.

    Last edited by squirrel_41; 02-14-2016 at 10:02 AM. Reason: onother thought


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