Gallery, Projects and General > The Design Shop
3D Printed Quorn Tool & Cutter Grinder
awemawson:
That thimble has come out very nicely.
When you say things have changed size/shape have you a guesstimate what sort of percentage? As the medium is squirted out at melting point, presumably the whole body of a print will get quite warm during the process. As the plastics are poor heat conductors they will take a long time to come to a stable temperature in the core of the object which I assume will tend to set up stresses which will probably take quite a time to come to an equilibrium. Not important if printing a Yoda or a small precision object, but more so as the size and mass increase.
Joules:
Andrew, this is the largest part I have printed, it does look like the internal structure has pulled the print out of line. Not easy to say how much, I just made up some paper feeler gauges and its looking like 0.010"" has opened up at the thin fillet on top where the vertical part of the print joins. When I finally come to welding these parts they will be clamped to a surface plate and tacked together, very much like tig welding. Once I get the bars in I can measure from them, it's all good fun.
I have started the print for the other end support, once its finished I will give it 48hrs to stabilise and see what we have. I tried to keep the wall thickness the same so if it is distorting due to internal stress, it may distort the same way, two wrongs making the best right I can hope for.
RobWilson:
:clap: :clap: :clap: looking good Joules :thumbup:
Rob
Joules:
29hrs printing see's the base castings complete.
Guess it might be Boxing day the bars go in. The rear bar will be press fit and the front bar a sliding fit (in theory). The micrometer thimble actually made a good gauge to test the 25mm Perspex bar. It does vary a little, so I hope to manage the two bar fits from the 1m bar I have. Otherwise doodling, the rest of the micrometer adjuster and working out a plan :scratch:. Threads into PLA, not likely, might get away with it in Perspex though. Will have to make some test parts and see how happy they are with 10lbs (4.5kg) load on them, otherwise its metal components in this area.
nrml:
Slightly :offtopic:.
Why not ABS-Polycarbonate blend instead of pure polycarbonate. It seems to be very highly rated by respected pioneers in the reprap movement. A tool grinder is not liklely to end up covered with oil and grease and the exposed areas could easily be given an appropriate protective coating.
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