16mm Sleeve Carriage for Rostock Printer and Igus Linear Bearings
by jpickens, published
I should add that I am currently building a Johann's Rostock with 8mm rods, and hope to use these simple and cheap bearings instead of the loud and expensive metal ones. We'll see how it goes.
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Just an idea for the couplings: http://www.igus.es/wpck/defaul...
My Thing-o-Matic tends to print slightly undersized and makes circular shapes slightly oval in the horizontal axis when printed. If you have a really tuned printer, it might not be necessary, but you'd have to tweak your print to get slightly less than 16mm to allow the plastic to stretch a bit.
My goal in using the plastic bearings was to minimize weight. I knew that the platform would be heavy due to the non-bowden extruder. I figured that 6 plastic bearings would weigh about 100g less than 6 LM8UU metal bearings, keeping the total mass of the build system down.
Using the metal pre-packaged Igus bearings would partially negate the weight advantage. The noise and wear issues were also a consideration, but weight was the main one.
I already had the reamer set, which I use for fixing the link pins and center pins of VW buses which I own.
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My ToM leaves a slightly undersized 16mm nominal sleeve.
Used an adjustable reamer from Harbor Freight to true up the sleeves.
Set the reamer to 15.8mm, and this gave a good squeeze on the Igus bearing to ride the 8mm rod. Maybe even too tight when I mocked it up. But better to start undersize and work up.
Please let me know what you think.
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