doug72 Posted February 28, 2015 Posted February 28, 2015 (edited) Having made a horendously complicated two axle turntable transmission to drive a subtractor unit which didn't work, I consulted Sariels"s excellent Technic Builder’s Guide book and built a two axle drive unit as shown on pages 96 to 100 but I was not happy that using thin single bevel 12T gears would be strong enough to drive a Mark 2 version of my tracked Dump Truck which is to have all motors in the upper rotating structure. I modified it to eliminate the fragile single bevel 12T gear - replacing them with double bevel 12T gears which are more robust. This also avoids the need to use the 4 right angle drive housing p/n 4558692 and has a very rigid structure. See photos on my Flicka page: https://www.flickr.c...57651087905165/ I have built a sample unit using various coloured parts which hopefully will show how it was constructed. The upper and lower parts are exactly the same. The input and output axles can be arranged to suit. Last three photos show the unit built into the chassis with the three motors located on the upper rotating structure. 1/. M motor for turntable rotation. 2/. L motor to drive both tracks. 3/. M motor to steer tracks via subtracter unit You could use two L motors with each track individually driven. I have yet to decide to build a Mark 2 version of a tracked dump truck or wait until the new crawler crane is available and use the two axle transmission and subtracter units in that model. Can the moderator correct the spelling error in the title box - thanks. Doug72 Edited February 28, 2015 by Doug72 Quote
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