Twin 540 Gearbox mk II


model  56004:  German Tiger IV - Production Turret (1/16)    [ click here for more German Tiger IV - Production Turret (1/16)s ]
status  Project
date entered  13/07/2011 14:32:26
description  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.
contact  Click here to email MadInventor


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New drive bosses with modified TT01 spur gears
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Spur gears needed drilling to fit onto the bosses.
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Drive bosses view 1
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Drive bosses view 2
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Motor plate in jig after final machining
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henrikw  16/07/2011 19:34:26
Genius work man! Looks very 'factory'

MadInventor  14/07/2011 11:25:57
@Slimmy, Thanks for good comments mate. Be careful with trying to mill with a drill press. I started off trying to to this and ended up buying a mill instead. A chuck cannot grip a milling cutter as solidly as a collet and is always slightly off centre, causing vibration when you try to mill. You'll probably be ok with a sharp cutter and cutting plastic or GRP, but aluminium will be v slow and steel pretty much impossible. I can't recommend getting a mill highly enough. Mine was second hand and is manual, but it's heavy and strong (500Watt motor) and is a very flexible tool, even if it's not cnc. It's good to be able to make something yourself, either because no else is making it, or they want to charge too much for it.
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slimmy  14/07/2011 09:19:07
Your work looks fantastic inventor. I could not help but see your milling machine in the pics. I just got a drill press. Now I'm going to get a drill press vise with the side motion adjustment and a milling bit and have some fun myself. Now I just need me a mini metal lathe and I can have even more fun in the shop.

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Henk4Focus  14/07/2011 06:09:35
Geez, look at that. Great work.

MadInventor  13/07/2011 21:15:00
@Roots - Maybe when I've finished the steel king tiger and the scratch built tractor Really Tamiya should be building these for FO king tigers, fitted with 65 or 80turn crawler motors, instead of the puny 380 jobs we've all got to put up with at the moment that chew themselves up a the first sign of a metal track kit.....
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Butcher-Bird  13/07/2011 19:10:48
wow...that's some serious engineering!

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Wyoming  13/07/2011 18:56:04
very nice looking bit of work on it

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roots  13/07/2011 15:54:49
Make me one! Make me one!

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Skottoman  13/07/2011 15:08:12
Looks like you have room for a 3rd motor in there. Heheh... Nice work!

 

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