New guy..with a used mill has a question. - Page 3


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  1. #25
    Registered Kenny Duval's Avatar
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    After some more shimming and measuring and shimming and measuring I got a 1.250 diameter circle to cut within .002 with repeatability. I'd like to thank the folks that wrote Mach3 for deciding it's a great idea to put in a save settings button that does nothing. Crashing on exit and loosing all the work I just put in was pleasant as well. I've had no problems while running code.

    I may make the move to a Linux based package if this continues. Maybe 4 will be better if it ever surfaces.

    I do know however now that the machine is capable of holding a couple thou so I'll go through the shenanigans again tomorrow and hopefully Mach won't crash when I am done.

    Last edited by Kenny Duval; 06-20-2013 at 11:34 PM.


  2. #26
    Gold Member jalessi's Avatar
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    Kenny,

    Have you checked the xmlbackups folder, you may actually have some of your recent changes.

    Jeff...

    Patience and perseverance have a magical effect before which difficulties disappear and obstacles vanish.


  3. #27
    Registered Kenny Duval's Avatar
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    I'll take a look. Does Mach periodically snap a backup during operation? If not I suspect they are gone. Not the end of the world just aggravating.



  4. #28
    Gold Member jalessi's Avatar
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    Quote Originally Posted by Kenny Duval View Post
    I'll take a look. Does Mach periodically snap a backup during operation? If not I suspect they are gone. Not the end of the world just aggravating.
    Kenny,

    I believe Mach3 snaps a backup xml each time, when exiting the program.

    Jeff...

    Patience and perseverance have a magical effect before which difficulties disappear and obstacles vanish.


  5. #29
    Registered Kenny Duval's Avatar
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    Quote Originally Posted by jalessi View Post
    Kenny,

    I believe Mach3 snaps a backup xml each time, when exiting the program.

    Jeff...
    It does when it doesn't crash on exit. Which is what happened. The last backup xml was from when I shut down Mach yesterday.

    Last edited by Kenny Duval; 06-21-2013 at 09:43 PM.


  6. #30
    Registered Kenny Duval's Avatar
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    Success...

    I'm within a .001 of round with good repeatability. Parts are accurate in dimension in the X and Y I still have what I believe to be some flex in the table at the gibbs as I can only hold about .003 across about 6 inches. That's next on the list of things to resolve. I know it's not the table surface as I couldn't get a .001 feeler under my 18 inch ground straight edge.

    I also have to investigate .005 of backlash in the Z. Seems like that is a bit much. It's highest of the axis. X is down at .002 and Y is better at .0012.



  7. #31
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    Kenny, I've also got Opti BF20l and right now I can hold about 0.001 inches on both axises on a 2 inch circle without using backlash comp. How do you measure backlash? I think I might get even better results using it but I'm already quite statisfied with the result.



  8. #32
    Registered Kenny Duval's Avatar
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    Quote Originally Posted by Madda View Post
    Kenny, I've also got Opti BF20l and right now I can hold about 0.001 inches on both axises on a 2 inch circle without using backlash comp. How do you measure backlash? I think I might get even better results using it but I'm already quite statisfied with the result.
    I'm probably the last guy here you want to ask. This is all new stuff to me. I simply followed the math and used the Mach3 steps per calibration mechanism. Then zero'd the axis and move the distance I calibrated against and back to zero. Any backlash would show up in the fact the machine came up short getting back to zero. Whatever you have to jog over to get back to zero was what I used as the back lash adjustment.

    Still so much to learn but getting better with the G-Code, setting up the stock and then milling. Today's project came out pretty well aside from snapping a drill bit and scarring up my part. Had to do a little hand finishing to try and clean it up. Also my 3/16 mill was a little short before it started flaring out to 3/8 so it nicked the radius above the mounting holes.

    I haven't picked up any chamfering bits yet so I just knocked the edges down with a file.

    New guy..with a used mill has a question.-probe_holder-png

    New guy..with a used mill has a question.-probe_holder2-png



  9. #33
    Registered Kenny Duval's Avatar
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    So who's go some ideas about solving table deflection. I've get a .003 to .004 drop at the extents of the X travel. I've got no side to side deflection and the gibbs are as tight as I can run them without creating more backlash.

    Any ideas.



  10. #34
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    You have to first figure out *why* you're getting the drop before anyone can suggest how to cure it. Is the table surface not flat, or not parallel to the ways? Ordinarily, you'd expect the table to rise up near the ends of travel, due to the weight of the long over-hang on extended end causing the table to tilt. The solution could be getting the table re-ground, or scraping in the ways and gibs, to improve the fit, so you can run the gibs tighter without excessive friction.

    Regards,
    Ray L.



  11. #35
    Registered Kenny Duval's Avatar
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    You're right on the lift part. I guess the winter project will be ordering a new set of gibs and putting in the work to scrap them. Not that I'll ever use the extents of the table movement but it needs to be addressed.



  12. #36
    Registered Kenny Duval's Avatar
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    Had a good afternoon with the mill. The results are starting to look better and I am making fewer mistakes.





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New guy..with a used mill has a question.
New guy..with a used mill has a question.