Worm Part - Cut-Sweep problem
Worm Part - Cut-Sweep problem
(OP)
Hi There!
I've got a problem creating a worm-like part the way I want it. Basically I want to create something like this:
ht tp://img13 9.imagesha ck.us/img1 39/8108/wo rm1sg4.jpg
The problem is; I do not want to simply cut-revolve a circle around a helix with a variable pitch like in this part. I want to cut extrude a cylinder instead of a flat 2D circle.
Like this:
http://img88.imageshack.us/img88/4323/worm3ke5.jpg
But I cant find an easy way to create this part. To make it a little bit more clear; next screenshot shows the same helix with a section view through the center. I marked the area's where there is material where there shouldn't be with arrows:
ht tp://img13 2.imagesha ck.us/img1 32/5411/wo rm2vl7.jpg
Any got a good idea how to solve this?
Thanks in Advance!
Bouke
I've got a problem creating a worm-like part the way I want it. Basically I want to create something like this:
ht
The problem is; I do not want to simply cut-revolve a circle around a helix with a variable pitch like in this part. I want to cut extrude a cylinder instead of a flat 2D circle.
Like this:
http://img88.imageshack.us/img88/4323/worm3ke5.jpg
But I cant find an easy way to create this part. To make it a little bit more clear; next screenshot shows the same helix with a section view through the center. I marked the area's where there is material where there shouldn't be with arrows:
ht
Any got a good idea how to solve this?
Thanks in Advance!
Bouke
Bouke Brouwers
M-Des
The Netherlands.






RE: Worm Part - Cut-Sweep problem
RE: Worm Part - Cut-Sweep problem
I was thinking the same thing, but didn't want to mention it in case Big Brother (Scott) is watching.......
In all seriousness, a swept solid is the only way to accurately do this. Please be aware that a swept solid is brand new functionality and will more than likely behave as such.
RE: Worm Part - Cut-Sweep problem
Although I'm afraid this is not really helping me, I'll be happy if I got SW08 in April/May and this part should have been made already. Our machines software did not seem to have the functionality we expected it to have so now I need a good model of the worm.
I can simulate the shape of the cutout by doing numerous normal cut extrudes from planes that I keep rotating 1° and then use the section view edge. But this will not work with the variable pitch. Bah, I'm quite at a loss here. Silly machines never do what you want em to do.
Bouke Brouwers
M-Des
The Netherlands.
RE: Worm Part - Cut-Sweep problem
Meanwhile, can you adjust the normal swept cut profile and angle (to the helix) to produce what you need?
RE: Worm Part - Cut-Sweep problem
RE: Worm Part - Cut-Sweep problem
RE: Worm Part - Cut-Sweep problem
Could you do a curve driven pattern of your cylinder around the helix (not merging bodies). If you have a ton of instances of the cylinder it will approximate a smooth sweep. You could then merge the bodies of the cylinders, but not the worm. After that, "combine bodies" with the "subtract" option selected.
Don't know if the above is clear, or if it will work, but it may be worth a shot.
-Shaggy
RE: Worm Part - Cut-Sweep problem
RE: Worm Part - Cut-Sweep problem
Sweep Surface:
htt
Copy and trim cylinder face: htt
Cut thicken: htt
SW2008 Premium SP0 - Rhino 4.0
RE: Worm Part - Cut-Sweep problem
I'll upload the part with the helix and the cutting tool according the above description also, would be a great help if someone with 2008 could make a step or parasolid file from it.
I quite like the curved driven pattern idea, I quite overlooked that option. I reckon I could make a (quite computer heavy) body with all the patterned instances of the tool and then try to make 1 smooth body from it and substract. I'll mess around a bit with 2006 and if succesfull I'll get back to you.
Thanks again :)
Bouke Brouwers
M-Des
The Netherlands.