Tank, Sprockets, Mag Idler Wheels, Suspension Arms

thingiverse

These tank track idler wheels go with the tank track 2in, sprockets and other tank related stuff in my things. Here are several sizes of idler wheels (1.5", 1.75", 2" and 2.25" OD) that will go with the single idler wheel suspension arms for the tank suspension. I think they would be too big to use for the double rollers arms. These use the standard 1/4" x 3/8" x 1/8" sealed ball bearings with shoulder bolts. When I get the o-ring sizes figured out will list them for you if you want to use them. Thought the mags looked cool. Thanks and enjoy! Update: downloaded a mag drive sprocket that uses the standard .770" hub. Also a front idler sprocket and spacers for use with 1/4 x 1-1/2" shoulder bolt. Same bearings as the idlers. Update: Downloaded another mag drive sprocket2 that corrected some mistakes in the back. I cannot get these to run G-code without errors but they print okay Update Dec-2017: working on a new tank frame and suspension. Here are the new suspension arms that have the idlers built in. The idea is for the idler to move up and take up the slack in the track from compression. Building a new tank to test it out. Will share the parts in this listing. All of the same parts as the old suspension can be used. Will be listing CNC made frame parts for the new tank on eBay as I get them done. Update Jan-2018: Downloaded a new 3D printed track tensioner arm for the tanks. This is a 3/4" arm that uses a 1/4" bolt as the shaft, with the bolt hex pressed in the arm to hold arm in place. These can be used with the threaded Fastmike brass bushing I have on eBay to go through the frame. Use a lever with a spring to put tension on the tank track like the original tank. This makes everything work so much better, stiff spring will keep tension arm from giving in reverse. Track tension is a must, but too much greatly increases drag. The tension arm uses 1/4"" x 1" shoulder bolt for the idler sprocket. Update Feb 2018: Had a hard time printing the 2.25" idler wheels in ABS. Took too long to print and cooling warped them bad. Downloaded a lighter quicker hollow version of the 2.25" idler that prints better and has a support ring and tabs under that comes off after built. These will print without support and save print time. Have not had a chance to test these yet, but the design should hold up just as well.