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Law curves to produce spherical 5-axis cutter path.

Creator
Creator

To create a spherical tool-path around a shaft I am currently using planes at 24 degree intervals around the part with a line on each plane at 1 degree increments, 1 shaft revolution = 15 degree roller-cam rev.

I would like to create the tool-path line by using law curves from which I can form a surface and use thicken to cut a roller cam path. Process images below.

Any ideas?

Roller_Cam_T-Path.PNG

Current Method of Design Image#1

Roller_Cam_T-Path_Dims.PNG

Blank Dimensions Image#2

Roller_Cam_T-Path_Surface.PNG

Tool-Path Surface to Create Thicken Roller-Cam Path Image#3

Roller_Cam.PNG

Final Product Image#4

Roller_Cam_Assy.PNG

Final Assembly Image#5

 

15 REPLIES 15

Re: Law curves to produce spherical 5-axis cutter path.

Siemens Phenom Siemens Phenom
Siemens Phenom

Could you post your part model, not the while assembly, just the completed 'worm' gear part?  Or at least a higher quality image of the Drawing which could be printed/plotted?  And what is the diameter of the cam rollers?

John R. Baker, P.E. (ret)
EX-Product 'Evangelist'
Irvine, CA

Re: Law curves to produce spherical 5-axis cutter path.

Creator
Creator

I seem to be having a little difficulty attaching the .prt file.

 

So I will try to send the .PDF of the part

Re: Law curves to produce spherical 5-axis cutter path.

Creator
Creator
 

Re: Law curves to produce spherical 5-axis cutter path.

Siemens Phenom Siemens Phenom
Siemens Phenom

Neither of the drawings indicate the actual diameter of the cam followers.  I won't need the part as I think I have enough here to model what I'll need to duplicate what you're doing, but I still need to know the cam-follower specs.

 

Also, what version of NX are you running?

John R. Baker, P.E. (ret)
EX-Product 'Evangelist'
Irvine, CA

Re: Law curves to produce spherical 5-axis cutter path.

Creator
Creator

The cam followers are 0.75" dia.

 

I will upload the SolidWorks model which I used to create the initial part.

Re: Law curves to produce spherical 5-axis cutter path.

Valued Contributor
Valued Contributor

Hey, John,

this is an nice example of solid sweep.

AFAIK there was something simmilar anounced for nx9, in nx10 beta I haven't found it.

Is there a roadmap when solid sweep will be introduced in nx?

TIA

uwenx

Re: Law curves to produce spherical 5-axis cutter path.

Gears Esteemed Contributor Gears Esteemed Contributor
Gears Esteemed Contributor

Here is one method that I think will get what you are asking for. I didn't use law curves, but rather a combination of sketches and a swept feature. You can use the expression editor (or the "user expressions" section in the part navigator) to edit some basic input. The model updates reasonably well for small changes, larger changes will require some tweaking to the sketches and/or swept feature.

 

Attached file is NX 8.5 format.

Re: Law curves to produce spherical 5-axis cutter path.

Creator
Creator

Unfortunately I cannot open this file, seems like it's from a newer version than my NX6.

Re: Law curves to produce spherical 5-axis cutter path.

Gears Esteemed Contributor Gears Esteemed Contributor
Gears Esteemed Contributor
And unfortunately, I don't have NX 6...

I could post a parasolid version that you can open, but it won't really capture the process.