Archive for January, 2006

Progress

Sunday, January 15th, 2006


So progress is coming along very slowly on Gunther, but it does continue. I’ve now completed the 6 aluminum axles that will transmit the torque from the two motors, through the pulleys, to the e-Maxx (remote-controlled monster truck) universal shafts. (Seen here with ball bearings, pulleys, and snap rings, and attached to the universal shaft.) I turned down the ends of the aircraft aluminum rods, and Chris helped me use his milling machine to cut some flats. (Man, I want a milling machine… CIM-101 should be fun, hopefully it’ll work out.) The robot’s design is such that even if all 4 belts were to simultaneously fail, each side of the robot would still have one powered drive wheel. As an aside, I LOVE retaining rings (aka snap rings). This was the first time I’ve installed them on anything of mine (using the lathe, of course), and they are a wonderful solution. Beats cotter pins!


The lathe is pretty cool. I was messing around with some spare 1/2″ solid plastic rod (PTFE?) and made a tiny little container. The press-on cap makes a nice “pop!” sound when you remove it quickly. It’s actually pretty cool… As soon as I get a new chuck key for the tailstock I want to try and make another one. The next one will have a cap that’s exactly the right size to hold one gram of 4F black powder, and a hole so it can be worn on a cord like a necklace. Perfect for dispensing ejection charges at the launch pad.

Lathe

Wednesday, January 4th, 2006

Am I officially crazy yet? It’s almost 3am and I just got done unloading my new lathe. (Thanks, Chris.) Apparently it’s restored from around World War II. I won’t be turning any cannon barrels with it, but it should serve as a nice introduction to the wonderful world of machining for me. I’m planning on using it to make robot parts (shaft couplers, that sort of thing), and rocket parts (small nosecones, couplers, I may even try my hand at making reloadable rocket motor hardware), stuff like that. If only I didn’t live in a 1-bedroom apartment the size of a shoebox, I’d have some place to actually put it. (It’s currently standing up against the air conditioner. Ideal setup, eh? Hah.) Hopefully in a couple of months I’ll be moving to a bigger place with a garage or basement.

Planning on signing up for CIM-101, the Intro to Manufacturing class at Camden County College. That will be the first formal training I’ve had of any sort regarding anything related to hardware. Up until this point it’s all been just self-taught. (It works, but it sure takes a lot longer.)

Got Gunther’s pulleys and belts today, from McMaster-Carr. They look great (although I thought the pulleys had keyways in them). My motor shafts are metric and the pulleys are SAE, but I think they’ll be a perfect press fit. Very very nice.

Still waiting for my AllElectronics order. I’m making a doohickey for one of Chris’ battlebots — the idea is to have two big beefy motors that can each drive the weapon disc, and I’ll make a circuit that will use the weapon’s RPMs to determine whether to run one or both motors. (Both motors to get it up to speed, and one motor to keep it going while saving power.) Planning on using a hall effect sensor and an AVR to monitor the spinning wheel and work the magic. Some dirt-crazy-cheap 70-amp relays will kick the motors on and off (gotta love surplus). I’d hate to be on the business end of that.