On Monday 18 March 2019 22:37:13 Stuart Stevenson wrote: > Gene, > > Rotary convention is whatever you want on your machine. > To match what a CAD system shows you would rotate the geometry > positive by moving in the counter clockwise direction when you view > from the X, Y, or Z directions. When you look at the Cartesian > coordinate plane laying on your desk, you assume the X axis is > pointing to your right, the Y axis is pointing away from you and the Z > axis is pointing up. Generally, a positive rotation moves the geometry > in a ccw direction. > The normal convention also assigns the label of the rotary tables as > follows - A axis rotates around the X axis - B axis rotates around the > Y axis and the C axis rotates around the Z axis. > If you mount the rotary table on the left (X negative) end of the XY > table (as an A axis) then a positive rotation of the rotary table > would result in the top of the table moving toward you. > An A axis that carries the tool would rotate the top away from you. > This would be the result the top of the geometry moving toward you but > since the rotary table is carrying the tool the top of the tool should > move away from you. > All of this is 100% arbitrary. The only requirement is the program > numbers and signs match the motion of the machine. Make it comfortable > for you and then do it with no apologies to anyone. > Almost every machine control can set the rotation however the shop > wants. All the labels are just that labels. You can label any axis > whatever you want. The axis Peaches can rotate around the Rutabaga > axis for all the machine cares. > > Regards > Stuart > Chuckle, nice way of putting it, and I don't have to reverse anything. One thing seems for sure, and thats the speed of this belt drive thing, the g0 speed is above 21000 degrees a minute. That also means its a bit soft, with cutting forces moving it a bit. But now I need a cbn wheel to shape lathe tools with a gentle touch.
Thanks Stuart. > _______________________________________________ > Emc-users mailing list > Emc-users@lists.sourceforge.net > https://lists.sourceforge.net/lists/listinfo/emc-users Cheers, Gene Heskett -- "There are four boxes to be used in defense of liberty: soap, ballot, jury, and ammo. Please use in that order." -Ed Howdershelt (Author) Genes Web page <http://geneslinuxbox.net:6309/gene> _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
