Model mill run-out for round

Forum|Forum|1 year ago
March 10, 2025
4 replies
1852 views

Using Creo 4.0 here ...

I have a 'handle type' part, that needs some edges rounded.

I have a problem with modelling the inner round because it has to stop 'halfway', where the red arrow is (see screenshot below).
If this part is produced on a milling machine, the round will of course not end 'abruptly' as shown below.

There will be some run-out of the radius mill.
How could I model this?

The inner round, I have now modelled as a sweep along a sketch (you can see the sketch as the blue line).

The mill run-out should look something like this:

Kind regards

Flexible Modeling

Best answer by EddyVE

@StephenW @Patriot_1776
Ok, let's go that extra mile and look at an actual tool to produce the round and make the model accordingly.

This is the matching sketch:

Note that the run-out (lead-out) radius can be larger than 3, but not smaller.

This is the sweep, modelled according the dimensions of the tool:

This is the result:

KenFarley

21-Topaz II

For this kind of thing, to make the model look like what I'm going to make, I will add a revolved cut at end of the sweep. Revolve the shape of the cutter in the plane of the feature end. In addition to looking good, it's a pretty accurate representation of reality. A bit of work, but worth it.

A

aputman

13-Aquamarine

You can draw a curve on the side of the handle and then create a round using the "Thru Curve" option.

E

EddyVE

Author

12-Amethyst

@KenFarley and @aputman , you guys gave me just the push in the right direction that I needed.
The solution (or one of the multiple possibilities) was fairly simple. The sweep along the sketch that I already had, just needed a little tweak.
I added an arc at the end of the sketch to provide the run-out path of the milling tool. Now why hadn't I thought of that!