gun tube rifling

Forum|Forum|11 years ago
June 5, 2014
3 replies
5257 views

Hello all,

I am trying to create internal rifling in a gun tube and could use some help.

1. I did this using a blend and created multiple cross sections down the axis of the gun tube. It works but is a brute force method and is not elegant. Meaning if you want to control the pitch of that blend, it become more difficult. You would have to figure out the distance between cross sections and their angle of rotation.

2. I tried swept blend and added a twist but that only goes form +/- 120 so if you want more than that it becomes more tricky.

3. I tried a sweep but i could not keep my cross seciton perpendicular to the diameter for the tube.

4. I tried a sweep with a trajpar function using a graph but could not get it to work.

Looking for some help. If someone know how to do this with sweep or trajpar that would be cool. If there is a better way then by all means.

Thank you.

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General

T

TomD.inPDX

17-Peridot

Welcome to the forum, Timothy.

Helical sweep allows both normal to the trajectory and normal to the sweep. Subtle but important distinction. You will see which you are using from the section orientation.

Patriot_1776

22-Sapphire II

Exactly. You'll need to know the cutting tool geometry to tell. For rifling, I'd say the section was normal to the centerline trajectory. Also, you don't need a graph to use trajpar, you can ues "t" to vary the degree value between zero and the total number of degrees.

T

tkocot

Author

1-Visitor

Thank you guys for the quick response. I tried the swept helix and give it a very large pitch. I only would the rifling to twist 1.5 times as it goes down the length of the tube. I also put it normal to the trajectory, but i still have problems. The cross section varies in shape as you move down the lentgh of the tube. The best method so far was the swept blend with the twist function but that can only twist so far. I would to do it with the swept helix if i could it would be nice and easy.

T

TomD.inPDX

17-Peridot

Helical sweep to create a guide curve and sweep to control the cut with variable fluting.

This method makes the cutter profile a little easier to define.

You still have the option of orienting the cutter tool

Creo 2.0 attached.

1_prt0381-prt-2.zip

T

tkocot

Author

1-Visitor

This was very clever and very helpful.

T

tkocot

Author

1-Visitor

Hey Steven, Antonius, and Frank,

Thank you for all of the replies and all of your help. Steven you nailed. I uploaded the file and messed around with the section profile and the pitch and it worked out great. Frank, where do I go to change it to absolute accuracy. Antonius, I guess my thinking was to sweep it along a path that was the center axis of the gun. While it did this I would trajpar the section to rotate it, but the helical sweep worked. This forum is a great resource and I hope to be hearing from you guys in the future.