I am attempting to turn the bottom of an egg.
Everytime I program the lathe, I get a "bad arc end point" message.
I have a cylinder that is 45mm diameter and 60mm long. The datum is set on the right edge.
I want to end up with an arc on the right side of the cylinder from x-7.5 z0 to x0 z-20 (where the datum, x0z0 is the right edge). I know that I can't cut the whole thing in one pass, so I'm trying to take off 1mm at a time--meaning arc from x-1 z0 to x0 z-20, then arc from x-2 zo to x0 z-20, etc.---until reaching x-7.5 z0 to x0 z-20.
When I get this side done, I'll turn the piece and cut the top.
Here's what I've tried:
g3 x0 z-20 i1 k20 f150
g3 x0 z-20 i-1 k0 f150
None of the other variations on this command in the help file make any sense to me.
I am trying to finish this before my seniors graduate (soon.) Please help.
Thank you,
Need Help with G03 Code on Microturn 2000
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- Triac whizz
- CNC Expert
- Posts: 238
- Joined: Mon 17 Jul , 2006 21:48 pm
- Location: France
- should that x be negative on your machine? that's x past the centre line
where ever your centre is Z (K) will be negative
I presume there's a line above this one, ie, the start point? G02 & 3 tell the machine where to go to and where the centre is.
where ever your centre is Z (K) will be negative
I presume there's a line above this one, ie, the start point? G02 & 3 tell the machine where to go to and where the centre is.
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I agree with Whizz - your X coords should be positive.
Also, try programming your arcs using radius (R) instead of circle centre(I,K)
Using R and the CNC will calculate the Cirle Centre for you.
Using I and K and you must calc the exact centre point else the CNC will complain
G01 X10 Z0
G02 X20 Z-5 R5
Note also that the X axis programming is a diamemter value (you program the diameter you want the billet to be, not the distance you want to tool to move) so this example will produce a 90 degree arc
Also, try programming your arcs using radius (R) instead of circle centre(I,K)
Using R and the CNC will calculate the Cirle Centre for you.
Using I and K and you must calc the exact centre point else the CNC will complain
G01 X10 Z0
G02 X20 Z-5 R5
Note also that the X axis programming is a diamemter value (you program the diameter you want the billet to be, not the distance you want to tool to move) so this example will produce a 90 degree arc