View Full Version : YZ plane arc; Where does the K go??

10-17-2007, 09:06 AM
Need to tap into the wealth of knowledge one more time.

I'm cutting a crescent shape radially into 1" aluminum round. http://www.lightningtimesavers.com/concave.JPG

Have my start and end points, and depth is good. But for some reason the crescent is too flat on the bottom, not smooth arc.

I think I have it narrowed down to not having K in the right spot. The instructions I'm using say the K is the center point of the arc.

What's confusing me is where to put the center of the arc: Is it the radius? or actual distance the center of the arc is above Z0? Since the depth is .2" and the radius is .551" would I set K to z.351" or z.551"?

edited to add: Does the ijk method only allow 90deg arcs max?


Russ H
10-17-2007, 10:55 AM
K vs Z0 should be similar to J vs Y0. If Z0 = top of cylinder, K = .351. Whether you can cut more than 90 degs of arc depends on the control software, older controls usually needed a new line when you crossed the CL of arc. Hope this makes sense.
Russ H.

10-17-2007, 11:18 AM
I'm using Mach3 and seems like it will only go to CL of arc.

Gonna have to find some more 1" rounds to practice on...

I appreciate your help.