Twin 540 Gearbox mk II

This is my second attempt at a twin 540 gearbox for a vintage king tiger. This time I used the existing gearbox frame, and made a jig to hold it steady whilst I machined the necessary holes to mount the motors. I wanted to try to create a gearbox with the minimum amount of alteration to the existing box. Other than cutting the holes for the motors, the original gearbox has not been altered at all. I then made two new drive shafts, along with 2 drive bosses from aluminium. To these are mounted 2 TT01 spur gears, with an old hotshot gearbox pipe used as a sleeve to get the diameters right. i'm quite pleased with this as it will be quite a bit lighter than the mk1 version with heavy machined alluminium plates, and it was also a much simpler machining operation to make, once I'd made a jig to hold the motor plate steady.

16/07/2012:
When I ran it the bevel slipped a bit due to flexing of the shafts the gears ran on, so I have fitted a rather thick (15mm ) aluminium brace to the front to support it. Whilst I had it to pieces I also took the opportunity to polish all the brass and aluminium I could with metal polish, looks much better now. It is fitted in my king tiger with the 3 tone camo job.