Is is possible to do undercuts with custom profile cutter?

[Andrzej.Sierawski]

Hi.

I need to machine undercuts using custom made tool with cutting surface on a negative taper. I can configure this tool using Routing Tool wizard but it's impossible to use it for undercuts. The only tool types suitable for undercuts are disc cutters, ball tools, tapered spherical, dovetail and barrel tools.

Unfortunately it's impossible to use custom profile with any of these tools.

So is there any other way I can achieve my goal?

Have a look at my cutter...

I attach two file with profile I'm using to create this tool.

[TK.421]

can you attach your project. you'll need to use a different strategy with this tool.

[antonio.ali]

Do you mean something like that?

Do you mean something like that?

[Andrzej.Sierawski]

Please have a look at the attached project. It should clarify what's I'm about. The undercut I want to machine is between -5 and -15mm Z.

[TK.421]

without sitting down and working with this for a bit, I can tell right now that a plane projection toolpath will get you what you need. As i have free time today, i will experiment with different strategies to see if there's a better way to do it.

[Andrzej.Sierawski]

I just had a go with Plane Projection strategy and I don't see option for undercuts. Please keep in mind I don't have access to 4axis CNC.

[TK.421]

you need to change the geometry of the curve you have for the tool a little to get rid of the concave features. This will allow you to make a form tool from that curve. I've attached my quick rendering of it so you can compare the two and modify as you see fit. Once you have the form tool created, a plane projection will give you useable results. I've created one as an example in the attached project. It's been my experience that routing tools do not always work well. I stick with barrel and form whenever possible.

Let me know what you think.
david
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[Andrzej.Sierawski]

I can't open the project you attached.

[TK.421]

what version of powermill are  you using?

[TK.421 · Accepted solution]

if you import that curve I sent and create your own tool, you can copy the settings from the screen shots below into your toolpath.  you can alter your plane (or line in line projection) to get most of the part in one shot. maybe a point projection would get all of them in one toolpath if your point is in the centre

use the tool as a form toolset the location and direction of the planeset the toolpath style and direction - click 'draw & preview' to view before calculationvoilà

[Andrzej.Sierawski]

I'm using PowerMill 2021

[Andrzej.Sierawski]

That strategy worked out very nice. Thank you @TK.421 .

[TK.421]

thats great! hopefully polishing will be a breeze 😛

[Andrzej.Sierawski]

I don't think any polishing will be required. What you see on the picture is coolant with some tiny swarf particles 🙂 other than that, it's smooth as silk 😊