Surface radius didn't match well

[tonychen]

We have a part .There are 12 radius matching one big radius. We used mastercam lathe to make nc and machined it.But we found there are some radius didn't match well.Did we miss anything ?Could any method solve this problem?Thanks!Under is nc code.

 

O0000

N1

G50S5000M03

G0T0303

G97S2513M03

G0X69.668Z1.288M8

G50S3600

G96S550

Z2.

G1Z0.F.05

X64.071

X63.984Z-.01

G3X58.65Z-.586R151.056

X53.219Z-1.122R153.135

X47.808Z-1.604R151.017

X42.414Z-2.035R149.121

X37.005Z-2.416R148.317

X31.61Z-2.745R146.842

X26.203Z-3.025R146.246

X20.807Z-3.253R145.187

X15.402Z-3.43R144.797

X10.003Z-3.557R144.15

X4.606Z-3.633R143.803

X-.8Z-3.659R144.21

G1X-4.8

G0Z1.288

X66.659

M9

G0X250.Z250.

T0300

M05

M30

%

[Kannon]

tonychen,

If your using mastercam to program your nc, and it looks like a good blend of radiuses on the screen then my only guess is the tool your using isnt the same as the one your assigning in Mastercam. Maybe not compensating correctly for tool nose radius of your cutting tool?

Just a couple ideas.... welcome to the forum!

 

[PE @ IHS]

Did you use a full radius insert? The g-code goes well below centerline, so I presume this is a grooving tool? You need to be more specific.

[tonychen]

We used another software to machine it.The result is good.We used same condition.(same tool,machine).We guessed "Is mastercam kernel not precision?"

[Hardmill]

First off tony, Welcome to thee forum.

If you could post your file on the FTP perhaps one of the

lathe gurus could take a look at it for you.

 

 

PEACE

[Glenn Bouman]

Can you post the program that did work so we can see the differance?

 

[tonychen]

This is the program that did work.Thank you for your helping!

 

O0001

G21

G50 S3000

N1 T0101 M42

G96 S100 M03

G99

G00 X63.984 Z-.01 M08

G03 X58.597 Z-.592 R151.056

X53.06 Z-1.137 R153.135

X47.867 Z-1.599 R151.018

X42.824 Z-2.004 R149.121

X37.257 Z-2.399 R148.317

X31.589 Z-2.747 R146.842

X26.329 Z-3.019 R146.246

X20.888 Z-3.25 R145.187

X14.893 Z-3.445 R144.798

X10.01 Z-3.557 R144.15

X4.047 Z-3.638 R143.803

X-.8 Z-3.659 R144.21

G40 G00 X250. Z250. T0100 M09

M30

[tonychen]

I put the file (4D.nc) to ftp (All_NC_programs4d.nc).This is the program that did work.Thank you for your helping!

[Glenn Bouman]

If I backplot the 2 files on top of each other the paths are almost identical.

 

We were looking for your .MC9 file not the .NC file.

[tonychen]

I put the file (4D.mc9) to ftp (All_NC_programs4d.mc9).This is the program that did work.Thank you for your helping!

[Philcott]

Tony,

 

I had a look at your file and all looks good till you get to the machine centerline (X0.0). You then machine in a straight line to a diameter of -4.8 you should put a radius leadout in here so that the tool clears what has already been machined a does not rub the part. You have not clarified where you are having problems with radii not matching but the file looks good.

 

Phil