Let's Make Robots!

New laser cut robot chassis for GM series motors

test bed for GM motors - currently sonar / avoidance
ROUNDBOT7_17_08_with_reverse.BAS2.12 KB

Well, I got busy tonight and designed a chassis for the GM series of motors. The GM motors are really tops with price/performance... at $5.50 each, they are VERY hard to beat.

I thought you might like to see a video of the chassis being cut out, so it's included. The material is plexi .093 thick - it's clear, but has a blue protective plastic coating designed to protect it durring cutting and handeling - plexi scratches easily.

I designed this because there are absolutely no good chassis for the GM series motors, and that's a shame because they are so nice.

I've got to mount a few more parts, but it should be done over the weekend. Thanx to Fritz for sending me some code to build on :-)

Everything has a solid mounting point on the chassis (screws) and the servo is a fuill size JR ST47, mounted off center so the shaft is centerline preventing cone errors durring scanning.

I started out as a machinist so I try to make everything with extremely close fitting tolerances and built to last - the deck is screwed together, but the interlocking tabs would hold it together by friction alone. Motors are hard point mounted with screws and add to the rigidity of the chassis.

Just a few more tweaks and I gotta figure out the battery configuration...



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IT make my ping sensor works. I though I was under power with the 4AA recharchable battery but it work great. I want to put 2 ping sensor on my rc car and so how do I start with that? Do I put both ping on the same pin? or the second ping on pin1 and do high and low for pin1? any advice is greatly appreciated.

Congratulations great job with the chassis!!!

Regarding the slots that interlock the two pieces of plastic together (gm9 motor bracket and round baseplate) if let say the acrylic is 3mm thick what is the size of the hole to accept it? I assume that due to material tolerances it should be a bit bigger.

Is it possible to have a pdf drawing with dimensions of the chassis for referance? I am trying to do a frosted acrylic cube with interlocking pieces and I don't know how to do the connections? 


Thanks a lot