Mastercam not correctly updating Tool Nose Radius for Post?

[Chaotic5555]

Not a good start to the week for Mastercam for me 

For whatever reason My tool nose isn't correctly updating on a roughing tool I'm using? 

Essentially my program is using two turning tools, a Rough Turning tool (80°) and a Finish Turning tool (55°).  I am trying to use a 1/64th tool tip radius for both of these inserts and for whatever reason the post isn't printing the correct tool nose radius.  No idea why this is happening but I'm thinking it might have something to do with the amount of stock being left in the cut.  

I'm leaving .020" in the X and the Y of my rough.  Ideally this leaves enough material for my finish turn to fully fit the tool nose radius and leave a good finish. When I do this, it updates my tool nose radius in the code and adds .020" to the radius.  

For example here is code without the .020 to leave in X and Y.

G3X.6756Z-2.2151R.0156
G1Z-2.7036
Z-2.786
X.835
X.9764Z-2.7153
G0Z.2
X.4869
G1Z.1
Z-.1911
X.6245Z-.5814
G3X.625Z-.5841R.0156
G1Z-2.0999
X.6609Z-2.1805
X.8024Z-2.1098
G0X.8524
Z-2.6036
X.6756
G1Z-2.7036
G3X.6755Z-2.705R.0156F.005

And here is what happens when I add the .020 to leave in X and Y.  

G3X.665Z-.5841R.0356
G1Z-2.0977
X.7139Z-2.2073
G3X.7156Z-2.2151R.0356
G1Z-2.7036
Z-2.766
X.835
X.9764Z-2.6953
G0Z.2
X.4869
G1Z.1
Z-.076
X.6609Z-.5695
X.8024Z-.4988
G0X.8524
Z-2.6036
X.7156
G1Z-2.7036
G3X.7153Z-2.7067R.0356F.005

Is this really a desirable effect? Is there a way to make it so that the radius wouldn't increase this extra amount?  

 

[AHarrison1]

It's not that the rad has increased it is more that your profile has been offset the amount to leave, i.e. .02".

You will see the exact same thing if you were to offset your cad profile by .02".

If I wanted a reasonable match in the rad then leave less material to take of on the faces.

I generally leave .02" on Dia (x) and .003 -.005" in Z.

[crazy^millman]

30 minutes ago, Chaotic5555 said:

Not a good start to the week for Mastercam for me 

For whatever reason My tool nose isn't correctly updating on a roughing tool I'm using? 

Essentially my program is using two turning tools, a Rough Turning tool (80°) and a Finish Turning tool (55°).  I am trying to use a 1/64th tool tip radius for both of these inserts and for whatever reason the post isn't printing the correct tool nose radius.  No idea why this is happening but I'm thinking it might have something to do with the amount of stock being left in the cut.  

I'm leaving .020" in the X and the Y of my rough.  Ideally this leaves enough material for my finish turn to fully fit the tool nose radius and leave a good finish. When I do this, it updates my tool nose radius in the code and adds .020" to the radius.  

For example here is code without the .020 to leave in X and Y.

G3X.6756Z-2.2151R.0156
G1Z-2.7036
Z-2.786
X.835
X.9764Z-2.7153
G0Z.2
X.4869
G1Z.1
Z-.1911
X.6245Z-.5814
G3X.625Z-.5841R.0156
G1Z-2.0999
X.6609Z-2.1805
X.8024Z-2.1098
G0X.8524
Z-2.6036
X.6756
G1Z-2.7036
G3X.6755Z-2.705R.0156F.005

And here is what happens when I add the .020 to leave in X and Y.  

G3X.665Z-.5841R.0356
G1Z-2.0977
X.7139Z-2.2073
G3X.7156Z-2.2151R.0356
G1Z-2.7036
Z-2.766
X.835
X.9764Z-2.6953
G0Z.2
X.4869
G1Z.1
Z-.076
X.6609Z-.5695
X.8024Z-.4988
G0X.8524
Z-2.6036
X.7156
G1Z-2.7036
G3X.7153Z-2.7067R.0356F.005

Is this really a desirable effect? Is there a way to make it so that the radius wouldn't increase this extra amount?  

 

Sorry, but what you are asking makes no sense in my opinion. You are asking for a .02 of extra stock everywhere, but not on the Radius? Why do you think you don't want the radius to change the amount that everything else changes?

AHarrison has called it correctly. 

[gcode]

As far as I can tell, Mastercam is doing exactly what it's supposed to me doing