Drive shaft for Robomow RS series
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The drive shaft on our Robomow RS series broke and apparently they don't sell that piece separately, but instead…
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- Other House Equipment
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- Creative Commons — Attribution
The drive shaft on our Robomow RS series broke and apparently they don't sell that piece separately, but instead they're happy to sell you a drive motor assembly for 150 euro instead. I decided I preferred to fix it myself and I ended up printing both versions. The normal version seemed sturdy enough, but I decided to install the version with the metal reinforcement.
Post-Printing
Normal drive shaft
The normal drive shaft is close to identical to the original one. I printed it upright ant it feels quite strong. I didn't test it though because I decided to alter my design to make it even stronger by adding a metal tube. If you don't want to go through the hassle of adding that tube to the print, this is the one to use.
Hollow drive shaft
The hollow drive shaft allows for a much stronger part, because you can slide a metal tube into the printed part and glue it in place.
After printing the piece, you can clean the hole with a 10mm drill. You'll need a piece of metal pipe with an inner diameter of 8mm and an outer diameter of 8mm.
Then all you have to do is drill the holes (or you can do that before glueing it in place). The metal tube slides pretty far into the print, giving it extra strength.
I included a design for a doweling jig to make drilling the 4mm holes easier.
doweling jig
insert 2 M4 nuts in the jig and glue them in place. Use a 4mm drill to remove the thread of the nuts. The nuts will help keep the drill straight when drilling through the pipe without damaging the printed part.
The jig can be used for relatively small diameter tubes, so not just for the 10mm tube.
How I Designed This
Designed in Fusion 360 after measuring the original with my trusty calipers.
Category: Replacement Parts