wrong dimensions of inner circles

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wrong dimensions of inner circles

Postby trendsetter » Mon Jun 11, 2018 7:06 pm

Dear all,
I am using UCCNC in combination with Fusion 360. I have milled a block for a bearing. The outer dimensions of the block are 44mm and I cannot measure any differences. (Within +/-.05mm) The inner circle should be 32mm but I measure ~ 31.6-31.7mm. Which is to small for the bearing.
I checked the dimention of the mill, but this is ok. As well as other stuff.
Has anyone any idea why the dimentions are so different? The G-code should consists of circles.
The accuracy in UCCNC is 0.03mm. Therefore should be fine enough.
Any Idea about?
BR
Michael
trendsetter
 
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Re: wrong dimensions of inner circles

Postby cncdrive » Mon Jun 11, 2018 8:33 pm

If the tolerance is set to 0.03 then the UCCNC will not make larger error on the path than 0.03 units.
It can be that the g-code contains different dia than 32mm, I would check and verify the circle dimensions in the g-code file.
Second it can be too fast feedrate for the spindle speed and so the tool could bend and cannot remove all the workpiece material, so the inner dia will be smaller than it should be.
cncdrive
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Re: wrong dimensions of inner circles

Postby trendsetter » Sat Jun 16, 2018 10:28 pm

Hi all,
solved it. The paet itself wss bending.
Everythibg fine..
br Michael
trendsetter
 
Posts: 6
Joined: Fri Nov 03, 2017 5:20 am


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