| The Breakroom > The Water Cooler |
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| picclock:
Hi Joules Thanks for replying. The surface roughness on that pinion gear looks really good - and the part about the blob size makes perfect sense. Finding that kind of info about surface finishes is quite difficult. I was less than enthralled with the coupling used for the z axis - seems strange that a conventional shaft adapter wasn't used. Having said that it appears that the ends of the threaded rod are supported by the motor spindle and the tubing is just to allow for some lateral or angular misalignment whilst providing rotational drive. Difficult to know how accurate it might be. Best Regards picclock |
| Joules:
LOL shock loading...... They do cushion the blow. These gears are meant for light loading applications or test prior to casting. You can do a lost PLA casting, and even print the gear oversize for shrinkage just by altering the software. They are a great "prototyping" tool and very quick to get a useable result that I personally couldn't machine. :drool: Eeeeerrrrrr yeah, suppose I am addicted to 3D printing so ignore the bias..... :thumbup: |
| tom osselton:
--- Quote from: Arbalist on July 28, 2015, 05:34:11 PM ---Not suitable for parts like gears but I understand the surface finish can be improved cosmetically on some materials by giving them a wipe over with some type of solvent. Plastic gears are often the weak link in some products. Two for no particular reason spring to mind and those are telescopic sights and milling machines! --- End quote --- And those cigarette compressors the gear only lasts about 1/2hr |
| vtsteam:
--- Quote from: Joules on July 28, 2015, 05:43:32 PM ---You can do a lost PLA casting, and even print the gear oversize for shrinkage just by altering the software. --- End quote --- Joules, have you tried to lost PLA cast? Because even with lost foam (and therefore a much lower level of flammable material) it's not easy to get accurate thin section results with good fill, because the foam is burned up during the pour. I would definitely like to see those gears cast with a lost PLA process. Lost wax is an accurate process, but the wax is carefully removed from an invested mold before casting, it's quite different from lost foam. Lost foam is much more approximate and iffy for small intricate parts, and I imagine that lost plastic would pose even more difficulties... I'm talking about thin section complex and undercut shapes, a major reason for people seem to promote a 3D printer for pattern making at the home shop machinist level. Now if the 3D printer made an accurate melt-out wax pattern, that would work with traditional lost wax casting methods. Perhaps that's what you mean? |
| Pete49:
Just for information but the Da Vinci filament requirement is very easy to work around. I use aftermarket 1 Kilogram spools as do many others without modifying the software that is supplied by Da Vinci so that is not problem. You can set the layer height from .01 .02 or .03 and the print quality and density is also adjustable. As to the layer lines they can be flashed off with a little acetone if it offends the recipient though I see no need. Pete |
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