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Post by burauzaa on Nov 3, 2015 15:22:33 GMT -8
I've been trying to get a model together to 3D print a movement ring for a watch that I have been playing around with. I made one by hand and it's not quite centered, so the the dial sits a little to the left in the case. I found an STL file for a movement ring that is almost perfect, but I'm having trouble finding the best way to tweak it to fit my needs. The outside diameter of the model is fine: 31mm, I just can't figure out how to adjust the inside diameter to 26mm without scaling the whole thing. I want the final file to be OD: 31mm, ID: 26mm, H: 2mm. I've been using sketchup so far as anything else I have looked at has been very intimidating, even though I'm well versed in things like Photoshop and InDesign etc. Any tips? I've attached the file that I have in case that helps. Attachments:WatchRing.STL (62.77 KB)
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Adrian-VTA
Global Moderator
Adelaide, South Australia
Posts: 5,327
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Post by Adrian-VTA on Nov 3, 2015 16:46:58 GMT -8
Sketchup is a pain in the backside for this kind of work. I'd recommend TinkerCAD if you're starting out. www.tinkercad.comIt has some drawbacks but the simplicity of working with it "like playing with children's blocks" works well if you don't have the time to really learn a drawing package (although I'd still recommend it) I've re-drawn it for you as it was faster than fixing the original. I've also got the ring to be properly round. Print that with the notched side up so you wont have daggy bridges. Attachments:31mmring.stl (61.41 KB)
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Post by whisperingbomb on Nov 3, 2015 18:59:00 GMT -8
I spent considerable time calibrating my printer (sd3 with custom firmware and a modded hot end) so that 5mm in CAD ends up being 5mm on the bed. Might want to verify that first. Also getting truly round prints took some belt adjustments. After all of that work my machine is pretty much "fire and forget" with almost no failures. Also fewer iterations to get the desired result.
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Post by burauzaa on Nov 4, 2015 3:30:23 GMT -8
Sketchup is a pain in the backside for this kind of work. I'd recommend TinkerCAD if you're starting out. www.tinkercad.comIt has some drawbacks but the simplicity of working with it "like playing with children's blocks" works well if you don't have the time to really learn a drawing package (although I'd still recommend it) I've re-drawn it for you as it was faster than fixing the original. I've also got the ring to be properly round. Print that with the notched side up so you wont have daggy bridges. That's amazing, tips and a fixed file! I was hoping that you'd respond to the post, but I didn't expect all that! I'll let you know how it turns out. Cheers!
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twall3
Can't Tell Time
Posts: 22
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Post by twall3 on Nov 4, 2015 7:44:20 GMT -8
Slightly off-topic, but still in the 3D printing realm. Seems like one could use a 3D printer to print out a dragon shroud. Any knowledge if there is a CAD file out there, or if this has been done before?
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graham
Can't Tell Time
Posts: 11
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Post by graham on Nov 7, 2015 9:48:33 GMT -8
Slightly off-topic, but still in the 3D printing realm. Seems like one could use a 3D printer to print out a dragon shroud. Any knowledge if there is a CAD file out there, or if this has been done before? I'm also trying to get to grips with 3D printing. If you have an original part, it is possible to scan it and export it in stl format. For example I have used microCT to scan a 6139 rotating inner ring. This is not perfect as the lume marker messes with the x-rays and you get a blob there plus all other imperfections show up so I need to clean the data up - ideally I would like to export this into CAD software - free if possible - any ideas? This one is purely an exercise to see if it is possible to do. Don't forget that the extruder type printers will not give a good surface finish. My guess for the above is that I would need access to a powder printer.
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Adrian-VTA
Global Moderator
Adelaide, South Australia
Posts: 5,327
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Post by Adrian-VTA on Nov 7, 2015 17:03:46 GMT -8
A part like that will be best reproduced by drawing it in a CAD package. It's too small and too detailed for any sort of 3D scanning technology. The smallest thing I've managed to make with 3D scanning was a plaster statue. I've tried various technologies including the thing that Jay Leno uses and they were all pretty limited. Now for the MicroCT, I'd suggest getting a crappy ring and carving off the lume, problem solved. What format does the CT scan come out in? I've worked with a little bit of this stuff before and there is a toolchain for it. Forget desktop printing full stop for making the rings, it's not going to happen, you'll need SLA/SLS, but I suspect most companies will refuse the job because of the size. That said if we can get a model, that's something to work with. I think it would be easier to draw the part in a CAD package than mess around with scanning. To clean up scans, I'd recommend Autodesk Meshmixer www.meshmixer.com/Slightly off-topic, but still in the 3D printing realm. Seems like one could use a 3D printer to print out a dragon shroud. Any knowledge if there is a CAD file out there, or if this has been done before?
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Post by burauzaa on Nov 22, 2015 14:43:12 GMT -8
Quick update on this. I sent the model off to the library to have them print it. It cost me $0.11 for the piece.
They printed it onto a little raft so I had to carefully cut it off. The ring was very round, but the inside diameter was a little smaller than 26mm. I had to do some careful sanding to get it to fit, but once I got that to the right size it was perfect.
Thanks!
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Adrian-VTA
Global Moderator
Adelaide, South Australia
Posts: 5,327
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Post by Adrian-VTA on Nov 22, 2015 17:56:57 GMT -8
Bargain! When I have some time I'm going to do some experimentation with these for the chronos and divers. I think the plastic should squish enough you don't need the rust magnet spring. Quick update on this. I sent the model off to the library to have them print it. It cost me $0.11 for the piece. They printed it onto a little raft so I had to carefully cut it off. The ring was very round, but the inside diameter was a little smaller than 26mm. I had to do some careful sanding to get it to fit, but once I got that to the right size it was perfect. Thanks!
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