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Originally Posted by Nate Laverdure
At the scale where your test results are useful (in the thousandths), this must be very sensitive to dimensional inaccuracies. How did you ensure that your printed gears were scaled correctly?
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A good question. We basically just printed them at the highest resolution possible with the smallest layer thickness possible. From other parts we've printed in the past, I'm confident that when the prints were completed, they were very accurate. The ZPrint software does a great job of managing this automatically for us.
However, we didn't apply any kind of hardening / finishing agent to the parts, and they are vulnerable to being damaged as part strength is fairly low coming right out of the printer. So we're definitely taking these results with a grain of salt, but it was a nice activity to show some of the students how the gears will integrate with the drive too.
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Originally Posted by TD78
I think he just 3-D printed the spacers...the gears look like the aluminum VEX gears.
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The gears & tube shaft parts are 3D printed here. The bolts are real but are not the ones we are planning to use for the real drive.
A big thanks to Madison from 488, Allen from 3847, Jeff from 1986 & Akash from 11. All of you have either helped us directly or inspired us by providing public CAD models & discussions on Chief Delphi.