Guys, I know this may be a simple question but I am having a real bugger of a time setting tool diameter comp properly.
In the past, I have never been able to get the control to properly deal with tool tip radius. No problem if it is a dead sharp tool w/o comp, but the radius never seems to be compensated correctly.
Doing spherical parts, they always come out egg shaped with a nub on the front. I recall it not dealing well with coming in at a negative X to start facing. I am pretty sure that I am doing something wrong, so I post here in hopes that someone can point me to the procedure for setting up & using comp.
In the past, I have used centerline programming w/o comp and that has allowed me to cheat.
However, I now need to run a part that will be rouged with a .032" rad tool and finished with a .016" rad tool. I'd love to use the G71/2 roughing with the .032"R and just chase it with G70 finishing & .016"R.
The specific part/feature is simple enough to think of as a spherical end on a piece of barstock. Lots of roughing.
Any pointers?
When setting tool offsets, I touch X to 1" diam stock (example) and set the X offset to 1.00 and 'measure'. Then touch the end of the stock, Z offset to 0.00 and 'measure'. Then I key in the radius offset as what ever it is. And always set the wear offsets to zero and check that the tool nose vector is correct. Set all the tools to the same Z0, then later set the part Z0 referencing a tool.
Any help greatly appreciated ! ! ! Surely someone has run radius comp sucessfully on a lathe!