Thingiverse
Barrel casting form for Projunk's Mecanum Wheel 82 mm by MirecXP
by Thingiverse
Last crawled date: 3 years, 1 month ago
THIS IS WORK IN PROGRESS, I HAVE NOT CASTED ANY BARRELS YET.
I have tried projunk's parametric mecanum wheels, it is great part for a robot. We have printed its barrels using FlexFill and it worked well on the carpet, but we had some issues using it on the smooth surface.
Now I've tried to cast the barrels from very soft polyurethane (Shore A20) using this mold. I think it will make the wheels more usable even with some other kind of material.
I have no prior experiences to casting, so I'll be glad if you have some proposals for enhancing the mold or the process.
You have to use some 3mm screws to tight the mold parts together. Do not forget to insert the axles in the mold before casting and use some clay to protect the axle bottom holes, otherwise the material may leak. Use the clay also around the edges where the two parts connect.
It is necessary to make all 8 barrels at once using this form, because some liquid material may leak to the empty neighbour barrel cavity. The exact amount of a material to make the 8 barrels is about ??? ml, it is enough to prepare ??? ml of material. I have used 20ml plastic syringe to fill it. I had to use a small piece of shrinkable tubing at the syringe needle hub to fill the cavities easier. Fill each barrel slowly until some liquid will leak from the small air holes around.
I have not used any removal agent, so it was very hard to open the mold and get the barrels out of it without braking the mold. Good luck. :)
After removal of the barrels it is necessary to cut some excess material with a sharp knife, do not try to rip it off.
Print also the 1-layer washers and put them on the axle on each side of the barrel to prevent unwanted friction between the barrel's sides and the wheel body.
I have tried projunk's parametric mecanum wheels, it is great part for a robot. We have printed its barrels using FlexFill and it worked well on the carpet, but we had some issues using it on the smooth surface.
Now I've tried to cast the barrels from very soft polyurethane (Shore A20) using this mold. I think it will make the wheels more usable even with some other kind of material.
I have no prior experiences to casting, so I'll be glad if you have some proposals for enhancing the mold or the process.
You have to use some 3mm screws to tight the mold parts together. Do not forget to insert the axles in the mold before casting and use some clay to protect the axle bottom holes, otherwise the material may leak. Use the clay also around the edges where the two parts connect.
It is necessary to make all 8 barrels at once using this form, because some liquid material may leak to the empty neighbour barrel cavity. The exact amount of a material to make the 8 barrels is about ??? ml, it is enough to prepare ??? ml of material. I have used 20ml plastic syringe to fill it. I had to use a small piece of shrinkable tubing at the syringe needle hub to fill the cavities easier. Fill each barrel slowly until some liquid will leak from the small air holes around.
I have not used any removal agent, so it was very hard to open the mold and get the barrels out of it without braking the mold. Good luck. :)
After removal of the barrels it is necessary to cut some excess material with a sharp knife, do not try to rip it off.
Print also the 1-layer washers and put them on the axle on each side of the barrel to prevent unwanted friction between the barrel's sides and the wheel body.
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