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Author Topic: bolt circle pattern problem  (Read 4693 times)

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Offline Hood

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Re: bolt circle pattern problem
« Reply #20 on: April 07, 2015, 03:32:29 PM »
Try cutting as big a rectangle or square as you can then measure the diagonals.
Hood
Re: bolt circle pattern problem
« Reply #21 on: April 07, 2015, 04:08:56 PM »
Ok i cut an 8 inch rectangle y length was 8.003 and x length was 8.005 measured from top left corner to bottom right corner 11.277 and from top right to bottom left corner 11.357

Is the problem with the table and how do I fix it.

Offline Hood

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Re: bolt circle pattern problem
« Reply #22 on: April 07, 2015, 05:23:48 PM »
I do not know how your machine is constructed so can't really say how to go about making it square but it would seem to be about 0.5 degrees out.
Hood
Re: bolt circle pattern problem
« Reply #23 on: April 07, 2015, 05:39:24 PM »
Its a signal ball screw in the middle with a rail on each side. i think i know what the problem is. I think the gantry is off and not square to the table. and i think i can adjust it.  May take awhile but Ill let you know if it works

Thanks so much
Re: bolt circle pattern problem
« Reply #24 on: April 10, 2015, 12:30:06 PM »
Its fixed. The problem was that x was not 90 degrees from y.  Stupid me should have thought of that.  I was thinking that the gantry was square didnt even think thats the x axis could be a skew. I was able to slot the bolt holes on the gantry and adjust with a tsquare and is pretty accurate for right now.  My plan is to make taller gantry arms later and the problem will be completely fixed.

thanks for all your help

Offline Hood

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Re: bolt circle pattern problem
« Reply #25 on: April 11, 2015, 02:33:40 PM »
Good you got it solved :)
I reckoned it was just under 0.5 degrees out from the previous dimensions you posted, doesn't sound much but as you saw it can make a huge difference.
Hood