Good thing I decided to check back on this forum manually, seems the e-mail notifications feature isn't working >.<
Anyway....
hairu526 wrote:I would recommend screws over glue but I can't guarantee that your table design will work well because I have not tried it. However, I vaguely remember seeing something similar on thingiverse.
I would prefer screws too, I am just not sure if I will be able to do it.
By some miracle I actually managed to do something useful with a 3D modeling application and split the 7 inch turntable into quadrants. Granted, I had to use two separate applications because I was able to rotate it properly in one but not the other, then cut out pieces properly in one but not the other.... and then that left the edges hollow so I had to use a third application to repair it and hopefully it didn't make any other changes that I can't find. I didn't try printing it but it loaded fine in my printing software, and when I loaded that piece four times over, rotated it, and joined four pieces together the end result looked exactly like the STL file for the one piece solid model so I guess I got it right. I am a little worried about the hole in the middle of the turntable now being made out of the corner of four pieces, but I couldn't tell from the assembly video what exactly fits into that, if anything. It looks like just extra slack for the motor shaft rather than something with a functional purpose. I aligned it so the four screw holes are in the middle of he quadrant instead of cut in half, since that would cause all sorts of integrity issues when you tighten the screw.
But the glue version will be a last-resort option for me if I can't manage to create a screw-version, or find someone who can print the whole 7 inch version for me at an affordable price, or any other alternative that isn't high priced. So I am trying to see if I can pull off a second miracle and manage to put tabs for screws and nuts on it.
Ironically, the best way I have found to get a sample of the screw/nut tabs are from the split version of the camera tower, it has a screw tab on one side joined by a nut tab on the other. So for the moment I loaded the two models together back-to-back and am editing them as if they were one to try to slice out a "tab" for the screw and another for the nut at the other end, then I can just un-join them and I will have a perfect reference model for one of each
I am not structural engineer, so I am also not sure where best to place and tabs and how many of them to try to make it stay as solid and not deform as much as possible compared to a single piece turntable. I was thinking of putting three, one as close as possible on the inside edge, as close as possible to the center spoke, and one right in the middle. Problem is I am not sure how to perfectly measure both tabs I am trying to cut out of the camera tower models to make them even on both sides of the screw hole, and even after that how to properly put them on the turntable model. While I am sure pretty much every free 3D modeling application likely has a way to measure the length between the tabs out perfectly, and a way to align the bottom of the tab perfectly flat with the bottom of the turntable I want to put it on, I have no idea how to do that, and "eyeballing" it using my mouse would be completely out of the question since it's a single piece which needs to be perfectly symmetrical with three more copies of itself, and there is no way I would be able to align the screw holes on one end of the turntable quadrant exactly with the nut holes on the other end of the quadrant that way.
8-Bits wrote:Unless you want to stay with all 3D printed parts I would suggest that you consider using a standard laser cut 7" x 1/4" thick birch plywood disk covered with self-adhesive light absorbing flocking material. That is what I used for my A3D scanner build in the attached photo.
Huh, where would I get something like that?
Also, how much does it weigh? I remember once someone asking if it would be possible to use a 10" turntable since they had a very large format printer, and were told that while technically it would fit and work, objects that extend too much towards the edge might put too much weight and strain on the motor. How much heavier is this thing than a PLA or ABS printed part would be?
Also about the material, the parts included with the Atlas 3D include a surface you would cut and fit across the turntable you are expected to print, though I don't know what material it is and which would be better.
8-Bits wrote:If you do decide to print and glue the turntable in sections be sure to use a special ABS adhesive if you use ABS filament; and a cyanoacrylate adhesive (aka Super Glue) if you use PLA.
Going to go with PLA, since my printer doesn't do well with ABS for anything with a raft larger than about a 1"x1" or 2"x2" postage stamp-sized square. Trying to do a test-print that is only 3"x3" and it keeps lifting when using ABS...
