Another quick update:
I received some carbide lathe tools in the post so it was time to turn another shaft adaptor. It turned out much better!
Once again the ingredients:
I've tapped the M6 hole for the grub screw and these fit nicely onto the GR02 shafts however they stick out a bit so I may have to cut a hole in the wheels. The grub screw are also cup-type ones so the cups will need to be ground down a little to improve the contact area with the flat on the shaft.
The major task remaining is securing the HTD pulleys to the shaft adaptor, I've got a fairly good idea of how I'm going to manage this I just need to do it.
My next steps for here are to complete the other 4 (and 2 spare) shaft adaptors & pulleys and then I'll be ready to attempt a trial run. of the chassis.







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