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by JoshM
Sat Mar 30, 2019 6:21 pm
Forum: Path/CAM
Topic: CNC Lathe and 4th-axis milling...
Replies: 142
Views: 9185

Re: CNC Lathe and 4th-axis milling...

There’s a compromise that I’ve been playing with that likely speeds up path calculation. Linear sampling isn’t ideal for a mesh. If I create a plane from Stocktop to bottom along each zig-zag segment, then iterate through all facets in the mesh, I can use vectors to calculate the distance from each ...
by JoshM
Mon Mar 25, 2019 12:31 pm
Forum: Path/CAM
Topic: CNC Lathe and 4th-axis milling...
Replies: 142
Views: 9185

Re: CNC Lathe and 4th-axis milling...

The primary reasons for specifying step-over are to: -Ensure that the tool is not subject to excess torque. -Ensure that the model is cut with adequate resolution. Since the step-over is "true" at the surface of the model, you are meeting the needs of the 2nd reason. Since you know the arc length, i...
by JoshM
Thu Mar 14, 2019 6:16 pm
Forum: Path/CAM
Topic: CNC Lathe and 4th-axis milling...
Replies: 142
Views: 9185

Re: CNC Lathe and 4th-axis milling...

Due to my lack of knowledge and expertise in this area of CNC milling and lathe processes, I am reaching out to you. I noticed that the existing FC tool controller[TC] has some fields for some tools that are extraneous to the tool, as I understand the tools. I Hi Russ, I'm no expert, but I also not...
by JoshM
Sun Mar 10, 2019 8:29 pm
Forum: Path/CAM
Topic: CNC Lathe and 4th-axis milling...
Replies: 142
Views: 9185

Re: CNC Lathe and 4th-axis milling...

Hi Russ, Great work--really appreciate what you're up to! I'm trying to take a look at your script now. I haven't gotten 4th axis, but I'm amazed at what's been done so far with harnessing OCL to fit into PathWB better. If I recall correctly, AWallin had built in various tool-tip types--end, ball, c...
by JoshM
Sun Mar 10, 2019 3:50 am
Forum: Path/CAM
Topic: Waterline milling update
Replies: 26
Views: 1629

Re: Waterline milling update

The difference in the two sides is because of mesh deformation in the offset mesh. Still looking at fix for that.

I tested against a toroid at an angle, and was pleasantly surprised.
dropcutter_example_005.png
dropcutter_example_005.png (123.71 KiB) Viewed 128 times
by JoshM
Sat Mar 09, 2019 10:57 pm
Forum: Path/CAM
Topic: Waterline milling update
Replies: 26
Views: 1629

Re: Waterline milling update

Hey Chris :D . I think I'm onto something worth exploring further here. I tried a 3rd strategy. I made an offset mesh per endmill tool shape, and used the projection onto it. It quickly generates tool paths where the tool tip should be. I was momentarily perplexed because one side is imperfect at th...
by JoshM
Sat Mar 09, 2019 5:00 am
Forum: Path/CAM
Topic: Waterline milling update
Replies: 26
Views: 1629

Re: 3d surface milling update

Thanks to @JulianTodd, I've explored this a bit further. I have a hacked up script--attached--that has allowed me to play with mesh offsetting. It takes a minute or more to run the attached model. This is not optimized. In short, a 2d Path-FeatureArea is attached to the stock top. The wire is discre...
by JoshM
Wed Feb 27, 2019 11:05 pm
Forum: Path/CAM
Topic: LibLathe - Lathe Path Generation
Replies: 23
Views: 1777

Re: LibLathe - Lathe Path Generation

Here's another job model to test against.
by JoshM
Tue Feb 26, 2019 2:06 pm
Forum: Path/CAM
Topic: LibLathe - Lathe Path Generation
Replies: 23
Views: 1777

Re: Lathe Features

Hi Dan, Glad that works for you. I'll try to come up with more models for you to work with. On G94, what I meant was that GCode allows movements that are absolute--ie. G0X0Y0F100--and relative to time (Feed Rate). G94 shifts it from distance per unit time feed rate to linear distance moved per rotat...
by JoshM
Sat Feb 23, 2019 6:44 pm
Forum: Path/CAM
Topic: LibLathe - Lathe Path Generation
Replies: 23
Views: 1777

Re: Lathe Features

Hi Dan,
Attached is a model representative of a typical mixed lathe/cnc job, to play with.
lathe_job_0.png
lathe_job_0.png (270.52 KiB) Viewed 240 times
It's largely a lathe job, but has other features that make it not entirely symmetrically radial.
Best,
Josh

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