FrankK

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  • February 23, 2015 at 6:42 pm in reply to: Incorrect shapes #7442
    FrankK
    Member

    I obviously mend that micro stepping should not help the resolution but the curves turned out better than expected. The letter ‘e’ is approx 8mm high.

    Frank

    February 23, 2015 at 11:35 am in reply to: Incorrect shapes #7439
    FrankK
    Member

    Something wend wrong with the picture:

    Chilipeppr logo

    Greetings,

    Frank

    • This reply was modified 9 years, 8 months ago by FrankK.
    February 23, 2015 at 11:31 am in reply to: Incorrect shapes #7438
    FrankK
    Member

    Eureka!

    I’m a bit ashamed but it had nothing to do with the TinyG. It was a grub screw on the X belt pinion. Because there is a flat spot on the stepper motor shaft the belt would stand still in a certain spot only due to a loose screw. How on earth this could result in 8 runs of the same contour and fully symmetrical distortion and zero steps lost is pure bad luck. But in the end we’re very happy with the fact the machine is running and milling. A lot of people told us it couldn’t be done with the TinyG on 30Volts but it runs well. The inaccuracy isn’t that bad also as you can see in the Chilipeppr logo letters.

    Grub Screw tightened

    120mm/200 equals 0.6mm per step. I know mircostepping should help with accuracy but I’m very content with the result. We’re planning on milling larger wooden panels to make a buck to make an Aston Martin DBR1 replica on an old TVR chassis. The aluminum panels will be made based on this buck.

    Many thanks for the support.

    Frank and Bram

    • This reply was modified 9 years, 8 months ago by FrankK.
    February 23, 2015 at 8:28 am in reply to: Incorrect shapes #7437
    FrankK
    Member

    The wood machine is indeed running with belts. I can move the gantry when the motors are energized but I have to put my back into it to do that. When milling the pinion shaped form a 2mm step was used for each run. So he did this in 8 passes and after that I checked of any pulses where lost by moving the mill to a certain known point and it was spot on. So I hope I can conclude from this that no steps were lost. I keep the power management constantly on. I was under the impression that $mt wasn’t important anymore when power management is constantly on. I’ll try $mt=60 and do a short run asap. The TR is rather large. It was the smallest pouly I could get with this wide belt. A reductor is pretty expensive so I tried this first.

    I also saw that the setting listing was strange. I checked my original file and the double entries are also there. Could it be that my TinyG is goofy and should be reset to factory default? Or is there another way? I checked earlier footage of the router scribing the Chilipeppr logo with a pen on paper at the point we had X and Y running for the first time. And the logo was ok then.

    Many thanks for helping,

    Frank and Bram

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