CAM allows 1/2 Ball mill to cut .025 radius

[artracing]

I'm doing a z planar slice across a 3D surface with 1/2 mill. There is one spot where the mill incounters a very small radius but it goes in to it and cuts it anyway. See photo. Bobcad didn't give warnings?
As you can see the model is different . The tool paths are rounded but the part is gouged on the tip. That's a where the .025 radius corners are. Is there some setting to get around this? I don't want to change the tool for this spot and understand it may look different.

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[SBC Cycle]

In simulation, run a deviation analysis. Does this show the gouge? Make sure you select your model as the "Workpiece" before running the simulation (I'm assuming you are using V29).

Did you select your entire model then limit the toolpath with a boundary or did you only select the surfaces you wanted to machine? Did you use the gouge check surfaces?

EDIT: I just noticed in another thread that you are using V28. In V28, hide everything in the BobCAD workspace except for your solid model before running simulation. This becomes your "workpiece" and that's is what the Simulation will compare the machined stock to.

[artracing]

In simulation, run a deviation analysis. Does this show the gouge? Make sure you select your model as the "Workpiece" before running the simulation (I'm assuming you are using V29).

Did you select your entire model then limit the toolpath with a boundary or did you only select the surfaces you wanted to machine? Did you use the gouge check surfaces?

EDIT: I just noticed in another thread that you are using V28. In V28, hide everything in the BobCAD workspace except for your solid model before running simulation. This becomes your "workpiece" and that's is what the Simulation will compare the machined stock to.

Sorry, I'm new.
I hit simulation and then run. That's about all I know.

Rob

[SBC Cycle]

No worries Rob, we were all new at some point and as things change we are all new again!

I didn't use to like the "new" simulation (it's old news now) but it's pretty darn good. Look for the buttons "Workpiece Focus" and "Material Removal". From your screenshot it looks like you are already in that mode but just to be sure. You can make both your workpiece and your stock visible at the same time but make the stock transparent (it's there in the buttons, just gotta poke around a bit). That can give you a visual to see if you have a gouge but the deviation analysis is the real tool to use here. Don't be afraid to click on things, you can always change them back.

In short, I don't think you have a gouge. It's really hard to tell just from your screenshots but looking at the geometry and the tool you are trying to use that's a bit what I would expect your part to look like. It's not just that you are using too big of a tool, the tool is so large compared to the geometry you are trying to cut you have no detail.

[jrmach]

a .bbcd file would help

Could be a number of gremlins at work

[artracing]

No worries Rob, we were all new at some point and as things change we are all new again!

I didn't use to like the "new" simulation (it's old news now) but it's pretty darn good. Look for the buttons "Workpiece Focus" and "Material Removal". From your screenshot it looks like you are already in that mode but just to be sure. You can make both your workpiece and your stock visible at the same time but make the stock transparent (it's there in the buttons, just gotta poke around a bit). That can give you a visual to see if you have a gouge but the deviation analysis is the real tool to use here. Don't be afraid to click on things, you can always change them back.

In short, I don't think you have a gouge. It's really hard to tell just from your screenshots but looking at the geometry and the tool you are trying to use that's a bit what I would expect your part to look like. It's not just that you are using too big of a tool, the tool is so large compared to the geometry you are trying to cut you have no detail.

I took the section with the problem and ran with .050 mill.
That solved the problem. CAD designer design with super small radius. The bad part is CAM program allowed this cutting with my 1/2 ball mill.
Attach is result on .050 ball mill.
How do you safeguard against this?
CAD designer is redrawing this section

[bostosh]

Looks like guitars here, Kool !
I got in trouble with these corners too.

[artracing]

Looks like guitars here, Kool !
I got in trouble with these corners too.

I would like to how you can prevent it from happening. I would hate to analyze all the radius on a project.
Seems that Bobcad missed the boat on this one.
Is there a safe guard?

Rob

[jrmach]

Can you give us an example .bbcd file

You tying our hands up a little without one

[artracing]

Can you give us an example .bbcd file

You tying our hands up a little without one

Actually I can't. I signed an agreement.
What I posted was from Bobcad, simulator and Centroid simulator.
It's clear that if I use a .050 Ball mill that section comes out perfect
The designer has agreed with situations and is already altering the drawing.
Maybe you can sumilate by drawing a smalll section like that.

Rob

[jrmach]

Maybe you can sumilate by drawing a smalll section like that.


That's what I was asking from you.
Can you duplicate the problem with an example that you can share with us.

[BurrMan]

Looks like it cuts the tip ok over here!

[jrmach]

Guess your model is good ?
or one of many other things,huh

[BurrMan]

Guess your model is good ?
or one of many other things,huh

Bingo. But there wont be any way to tell or give suggestions from a screenshot...

[artracing]

The rib is lot taller. Might make a difference. I upload the NC file for that section. The is the one with .050 mill



Rob

[jrmach]

Let's guess,,,,dog leg rapids ?
Bad surfaces ?
Machine over travel ?
Slow down going too fast ?
Not to mention wrong tool path

Sorry,,if you could draw a sample.............

[artracing]

I gave a sample in last thread. The exact one in question but with .050 Ball mill
I have run this with 1/2 Ballm mill at 100ipm and 25ipm plunge and 250ipm and 35ipm plunge. Same result

[jrmach]

Sir, a .bbcd file

I been sayin from the beginning,,lots of things can cause that,,,but

My bet it is not Bob's fault

There are some very smart people on here,,,if really want help,,you have to help us

A screen shot is pretty,,,but there are a 1/2 dozen or more things,other than Bob,,that you could be doing wrong,and or your designer,,yes your designer,,maybe

but,we all are limited with out a .bbcd file,,,then we can see what is going on

If you are unable to draw solids in CAD,,maybe have your designer replicate the problem area in a .bbcd file

also the .nc file ,,,I don't see it ,,,,but that ain't what we need anyhow

[artracing]

Here are the three surfaces.Attached
<ED: Zip file had to be removed from this post by User's request>

Rob

[jrmach]

jsyk,,,you have to .zip files to upload them