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[Qt_Vismach] STL file incorrectly centered

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18 Mar 2022 00:46 #237594 by RomeReactor
[Qt_Vismach] STL file incorrectly centered was created by RomeReactor
Hello all. We're in the process of adding a rotating fourth joint to a mill, but the STL file doesn't have its origin in the center of the piece, which causes it to rotate incorrectly:


 

Is there a way to move the origin to the actual center of the piece?
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18 Mar 2022 05:34 #237614 by cmorley
Replied by cmorley on topic [Qt_Vismach] STL file incorrectly centered
As far as I know, no the program assumes the origin is the center.
I am not very experienced with vismach though.

was your model of the chuck built with the origin in the middle?
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18 Mar 2022 18:49 #237663 by RomeReactor
Replied by RomeReactor on topic [Qt_Vismach] STL file incorrectly centered
yes, the STL model is made in SOLIDWORK and we established the origin of the piece in the center

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18 Mar 2022 19:40 #237668 by cmorley
Replied by cmorley on topic [Qt_Vismach] STL file incorrectly centered
maybe something like this (setting translate x y or z to the required offset)?

chuck = HalRotate([STL_part], None, "hal_pin_name", angle_scale, x, y, z)
chuck = Translate([chuck], x, y, z)
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19 Mar 2022 18:07 #237729 by cmorley
Replied by cmorley on topic [Qt_Vismach] STL file incorrectly centered
After thinking some more, you probably need to translate the part before adding the HAL rotate.

chuck = Translate([STL_part], x, y, z)
chuck = HalRotate([chuck], None, "hal_pin_name", angle_scale, x, y, z)

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19 Mar 2022 22:54 #237753 by cmorley
Replied by cmorley on topic [Qt_Vismach] STL file incorrectly centered
maybe this thread will help?
forum.linuxcnc.org/38-general-linuxcnc-q...h-coordinate-systems
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23 Mar 2022 00:30 #238058 by andypugh
Replied by andypugh on topic [Qt_Vismach] STL file incorrectly centered
Yes, translate first, then hal_rotate.

Though it might be tidier to move the model to the right place in the CAD.
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23 Mar 2022 20:48 #238134 by RomeReactor
Replied by RomeReactor on topic [Qt_Vismach] STL file incorrectly centered
Sorry for the late reply. Yes, I figured we needed to translate the part to offset the origin, then add the pin, and lastly reverse the translation to return the part to the desired position. It's working fine now:

 
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24 Mar 2022 05:08 #238191 by cmorley
Replied by cmorley on topic [Qt_Vismach] STL file incorrectly centered
Thanks for confirming the procedure. Very nice.

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