So I've tried making the semicircles that go around the truck rims several times now but I just can't get them straight. Someone here mentioned that they made them from vacformed styrene hemispheres.
Anyone have any vac formed hemi's ?
Or any other tips?
Make the circle/donut. Measure the gap.
Draw on the gap as to where you will cut it.
Cut it but INSIDE were you should, so you leave some material.
Bend them a little and glue on. THEN trim the gap parallel at the right separation.
It will work. Trust me.
Yes, heed that advice. It does work, and so far no one has done vac'ed hemispheres.
If you're having trouble visualizing the correct shape draw the circles on the hemisphere and trace the pattern onto some tape. Lay the tape flat on styrene cut bend and everything BrundelFly said.
Thanks for the tips. Night eyes, already tried sketching it on the sphere and transferring over. Just couldn't get the hemi doughnuts cut out evenly or symmetric. I think I'll try brundlefly's suggestion next.
Small update for me. So I've made my donuts. Here's how:
Cropped this image from the tutorial, adjusted size appropriately and then printed
Copied this template to styrene then cut out a donut. Then sanded and Checked size. It seemed to work.
Then I copied this pattern to 9 more pieces of styrene.
I then Realized the inside of the donut was the same size as this bottle of paint.
So I used some sandpaper over the bottle in this fashion
Then used all 10 donuts over the bottle to even out the outside perimeter
Here's the result. Most are pretty even.
I'll keep moving forward.
I have one of these olfa circle cutters. Not used it yet, but might be interesting.
I have one of those too .... as it is, I'm not to thrilled about it .. It keeps loosing alignment, so the radius either gets bigger or smaller ...... but I think a couple of glued on ABS strips would keep it aligned .. hmmm perhaps I should try that.. a lot of circular cuttings in a couple of upcoming projects
Another quick question. So previously I glued on the uneven semi circles onto the hemispheres. Now that I've redone the donuts I need to remove the old ones. I used zap a gap, I think. Is there any good solvent to remove this? Or should I just start over w new hemispheres.
Scraping it off w a razor blade isn't working well.
I started my own Training Remote yesterday.... I've taken the vac-form approach as Frank recommended, for the styrene-details ..... I really can only recommend this approach, because it'll result in a super-snug fit of the styrene detail
(A big thanks to Moe for help with the vac-forming)
(And I promise, no more hijacking of Nighteyes' thread .... I promise to start my own thread, once I get a bit further with the project )
You did it!
Just check the dates a few pages back to see how long we've been talking about vac'ed hemis.
Had my own remote at Wonderfest this year so some of you guys might have seen it.
When I made my molds from silicon it bonded with the double sided tape I had used to hold the parts in place. The tip was to brush on Elmer's white glue over the tape to prevent this from happening.
I very lightly weathered my remote but I continue to work on matching the original spot for spot, so in my mind it is still unfinished.
Ok, I get it.
And I find it very useful that advice because I also use double sided tape to attach the pieces to be molded.
what measurements did you guys use for the inner and outer diameter of the rings? I used 23mm (inner) and 46mm (outer) as stated in Franks tutorial ..... I should have seen it right away, that these numbers doesn't add up, since the outer diameter of the rim is 23mm ... the the inner diameter of the styrenering should be closer to 30mm and the outer diameter should be somewhere between 46-52mm
Oh well ... I need to make some new rings .. glad we made a couple of extra vac-pulls
I started with Franks measurements, referenced one of his rotocast kits, and finally eyeballed some adjustments. I am traveling at the moment but when I get back tomorrow I'll measure what I've got on mine. Fairly certain it's very close if not dead on.
Last edited by TheRealMcFly; Jun 17, 2012 at 10:20 AM.
Mine are measuring about 56mm for the outside diameter. I recall the original being slightly irregular in regards to geometry and placement.
Because this will have a lot to say on the outer diameter (see pic) ... so is 56mm measured along the curved surface (#2) or measured in a straight line with e.g. a caliper (#1)
I've just made some remeasuring... and I think the outer diameter on the curved ring, measured with a caliper (#1) should be roughly 53mm... this would compare pretty good to a 55-56mm ring cut from a flat piece of styrene and then bend'n'curved
I measured with the curve by marking a piece of tape on the remote and then laying it flat. I still think its closer to 55.5 than 56.