G03 What wrong with my program?

[rideredcr]

I'm teaching myself how to program and I've come across some issues with programming G03. I have a Haas TL-1. I am machining a sphere in Aluminum, but eventually the final product will be produced in 4140. The radius of the sphere is 0.8875". T0101 is a DCMT with a 0.016" radius. My program is as follows:

G96 S300 M03
G00 X4.01 Z0.01 T0101
G71 D0.075 F0.014 I0.05 K0.05 P10 Q90 U0.05 W0.0
N10 G01 X0. Z0.
N20 G03 X1.775 Z-0.8875 R0.8875
N30 G03 X1.069 Z-1.596 R0.8875
N40 G02 X1.096 Z-1.662 R0.062
N50 G01 X1.181 Z-2.491
N60 G02 X1.301 Z-2.569 R0.093
N70 G01 X3.035 Z-2.894
N80 G03 X3.156 Z-2.982 R0.093
N90 G01 X3.156 Z-4.6995

My limited knowledge of programming says this is right, but with the alarms I get on the machine says it's not. Any help would be appreciated.

[dcoupar]

It might help if you told us what alarms you are getting, and where. Also, what happens after N90? And maybe a drawing of the finished part?

[Geof]

Try moving your start position on the line before the G71 to Z0.10 and change line N10 to G00 so you select Type II roughing.

[gizmo_454]

Try moving your start position on the line before the G71 to Z0.10 and change line N10 to G00 so you select Type II roughing.

+1

I would also change X0 to X-.04 then add a line G01 X0 F0.00*. That will make sure there is no nub on the end of the sphere due to your 0.016" tool nose radius.

Mike

[rideredcr]

This is the drawing of the finished part.

[KenFoulks]

Try using I , J, and K instead of R values.

[BigC]

Z0 can't be the face if you want N20 to have z-.8875 since that is the full radius. Z0 is either .0745 off the face or N20 should have Z-.813. It may be easiest to set your Z0 then all your other dimensions would fall in place.

[dcoupar]

Try moving your start position on the line before the G71 to Z0.10 and change line N10 to G00 so you select Type II roughing.

Hey Geof,

I may be wrong, but I think specifying both X and Z in N10 selects Type II roughing. I'm pretty sure that G00/G01 doesn't have anything to do with selecting type I or II.

[dcoupar]

This is the drawing of the finished part.

We still don't know what alarms you are getting, do we?

[Geof]

Hey Geof,

I may be wrong, but I think specifying both X and Z in N10 selects Type II roughing. I'm pretty sure that G00/G01 doesn't have anything to do with selecting type I or II.

You are probably correct. I am working from memory being a few thousand miles away from the manuals I have beside my desk.

[rideredcr]

Thanks for the help guys! If I remember correctly the alarm message was "Z exceeds R value" but Ill get exactly what the alarm code says this weekend for you dcoupar.
Ray

[Technical Ted]

Also note which line in the program is causing the alarm.

I do believe there are some errors in your program. I can't see how the start of the .062 radius (1.069) can be a smaller diameter than the end of the radius (1.096) when the angle is just 5.9 degrees. That also happens to be the line in which the Z value is greater than the radius. 1.662 - 1.596 = .066

I've been a machinist for quite a few years & could not make this part with the information given on that print.