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« on: June 04, 2013, 04:25:16 PM »
Thanks for your replies guys, much appreciated.
I think my biggest problem at the moment is not having my table built so I can see the results. I should be up and running in the next two weeks.
I will try to explain my thinking as clearly as possible. 850x600 rectangle with 100mm radius corners centered on square turntable.
So starting with the first 850 side I move X 650 (850 - two corner radius).
Now I get to the first corner, I need to rotate my job 90 deg on the 100mm corner radius centre.
The turntable must rotate 90 deg every corner to present the next side to me.
I cut out a cardboard shape of my work and pushed a pin in one corner radius, when I rotated 90deg around the pin, I could see this was the correct motion I require, the center of my work was following a large opposite arc, as mach 3 thinks the center of my work is my cutting tool I guessed this was the path to plot.
As the length of the center arc is about 6 times greater than the circumference of the 100mm corner radius, I need to increase feed rate on the corners to match the speed of going along the sides.
Forgive me if this sounds silly but if you put a credit card flat on a piece of paper, draw an arrow on the paper, now pass the entire edge of the card past the arrow tip until your back to where you started. The center of the card being my toolpath.
Regards
Ricky