Alternative motor mount

The original Shapeoko design called for a single belt to drive the ‘Y’ axis. In Shapeoko terms, Y is the axis that the Gantry rides along. That’s fine with a short axis, but when you grow it an extra meter or so, you need a dual belt drive.

We use a rather hefty Nema 23 with around 250oz/in of torque, so dual motors seems a little silly. To solve this, we’re adding a shaft drive. Each end of the shaft will be mounted using a press fit bearing and plate.

This week, we fabbed up some motor spacers. These were cut down to 2″ on our mini lathe, center drilled and tapped for M5 hardware. The Lathe makes it easy to ensure that the ends are square and that the tapped holes are actually centered.

You can also see the shaft that’s being built to drive the dual belt system. Next up: bearing plates!

  1. Very nice build! I’d forgotten about Makerslide being developed, so as soon as I finish this note I’ll go look for their website. It’s probably a nit, but there’s one thing I noticed that you may want to take a second look at in your design. The drive shaft diameter for the dual belt system visually appears to be somewhat small for it’s length. It’s possible that the shaft could twist enough to cause some racking of the frame above. Worst case, you might end up with an oscillation in the frame as the shaft twists and untwists rapidly. Perhaps a larger diameter hollow shaft would help prevent twisting and oscillation? It would also help to make the drive shaft self supporting and prevent whipping. Again, just a thought….

    • It’s a 1/4″ hardened, ground polished shaft. I doubt twisting will be much of an issue, but I’ll definitely keep an eye out for it. Once it’s in operation, I’ll measure the deflection and post the results.

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