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EVguru
08-31-2011, 10:08 AM
I'm going to put a DRO on my Harrison L5 and I'll probably upgrade the elderly 2 Axis Mitutoyo on the mill to a modern 3 axis unit.

Comparing two 3 axis milling units with very little difference in price between them...

One has a couple of extra features. The ability to display Polar Coordinates (angle and distance from a point) and aldo position holes on an elipse (rather than just a circle).

The first I can see might sometimes be convenient, not having to do the trig to convert to Cartesian coordinates, but has anyone ever drilled holes on an elipse? I can't even think why I'd want to!

Lew Hartswick
08-31-2011, 10:13 AM
has anyone ever drilled holes on an elipse? I can't even think why I'd want to!

:-) A bolted flange fitting on an angled fitting. Only thing I can think of.
:-)
...lew...

boslab
08-31-2011, 03:00 PM
a circular thingy inclined will be an ellipse? no i havent, nor intend to!, hard enough to get circular holes in the right place!

djc
08-31-2011, 04:38 PM
...has anyone ever drilled holes on an elipse?....

If you think about it, every bolt circle you ever drill is on an ellipse. It is just that the ratio between major and minor axes of 99.9% of bolt circles is unitary. So the circle is actually a special case of the ellipse.