Last night I had a talk with an old classmate who will CNC the parts for the new drive system in Aluminum. We could easily work together through FUSION360 project sharing (Note: I Love Fusion360). He pointed out some changes that needed to be done before doing CNC milling. So we applied some changes to the parts and he is going to start doing the longer support beam connecting the two wheel bodies with CNC (I will post video on the CNC milling when they are done).
In the meantime, when he starts working with this, I started 3D printing a prototype of the engine brackets last night. To be sure that the design is correct before doing the actual CNC milling (don’t want to waste time and aluminum doing something wrong).
The print came out quite nice. It took around 5 hours for both parts to the right of the robot. I tried to fit the shaft bearings in the parts to confirm the dimensions and Yes like a glove! The parts where printed with PrimaSelect PETG at 240C and the heat bed at 85c (The actual temprature is probably closer to 55-60C on the bed If you count the heat loss due to the glass plate and the 3D printing surface Lokbuild). The parts where sticking nicely on the bed and came loss quite easy when I let the bed cool down to room temperature again.
The part where then test fitted to the rest of the body
Side note: I’m not quite happy with the cutting of the silver steel shaft I bought. They left cuts marks that the end of the shaft, making the bearing hard to mount. So I could not test the shaft this time. I will need to split the shaft into two pieces and grind the ends of the shafts.
One great feature with Fusion360 is the ability to quickly and easily share a link for a visualization of the parts used. If you want to have look, here is a link to visualization of the drive system
And here is the motor blueprints for the Brushless motor I am going to use. They are arriving on monday night. Perfect time to have the prototype ready for testing!
Next print will be the two wheels. The wheels need to be printed separate, because they are big!