custom tool profile backplot problem

[WWFCAM]

I'm having a problem with custom tool profile when trying to mill a radiused surface on the o.d. and id.(torus shape, donuts)

 

the custom tool is like a bull nose endmill but with a multiple (changing) radius.

 

when I use a true bull nose endmill the surface profile is contacted properly when backplotting, but with the variable radius tool the profile is not.

 

Is this a bug in mcam or just that mcam can't truly understand custom unique or homemade tools?

 

we are using X sp1

 

is this a mcam issue, backplot issue or tool definition issue?

 

our reseller thinks it may be a mcam issue

 

any help is appreciated

thanks

[Roger Martin from CNC Software]

Please send your file to [email protected]

 

Thanks for your input!

[Sumac Andy]

What was the outcome of this??

I have a Torus end mill that I would like to use...... and cannot get it to contact the work piece properly - Mastercam 2018 - so hope this would have been sorted by now?

 

TIA.

Andy.

[David Colin]

You still can't use a custom profile to compensate/calculate toolpaths.

From your screenshot, Mastercam will always compensate on Mastercam tool profile (outlined) so you can try to improve this outlined contour playing with Mastercam tool parameters.

[pullo]

Are you using it for roughing only  ? BTW congrats on  your good memory

Gracjan 

[Sumac Andy]

4 minutes ago, pullo said:

Are you using it for roughing only  ? BTW congrats on  your good memory

Gracjan 

A quick search found this one from the past

[Sumac Andy]

6 minutes ago, David Colin said:

You still can't use a custom profile to compensate/calculate toolpaths.

From your screenshot, Mastercam will always compensate on Mastercam tool profile (outlined) so you can try to improve this outlined contour playing with Mastercam tool parameters.

Hi Dave, thanks for the reply....

I now have this tool form, this is good for around 2/3 of the form to be cut, then, towards the end of the tool path the cutter starts to move away from the form.

[David Colin]

Your tool looks pretty good now. Maybe there is an issue... May you share a file?

[Sumac Andy]

Hi David.

Here's a stripped down file with surfaces replacing the solid model and a '.STP' of the tool to use.

You will see what I mean when you run the back plot. 

Torus Test.mcam

_50961101_10mm torus mill.step

[David Colin]

It looks like there is an issue with this combination of tooltype/toolpath and I can't find an easy workaround to this...

[Guest]

Just tried a couple things in 2019, nope....neither step/wireframe will work, nor Feedmill or custom tool

[Mark VIII]

At least the custom tool looks nice. It's like my old 2001 Cadillac Eldorado. It never ran well, but it always looked nice.

[Sumac Andy]

I see something here...... op. with tool in shows a 1.997779mm corner radius! This isn't in the tool definition but I think it could be my issue!

[David Colin]

Good catch. Actually this toolpath (and other legacy toolpaths) will assume a standard radius cutter for calculation toolpaths...