Hello Everyone, Not new to the site but had to reset username and password due to changing emails.
Thanks to retirement and Covid it has given me a chance to do some 3D Cad modelling of Mark I, Mark IV and Mark V tanks. I have focused on getting the Mark IV tank more to completion. I like what others have shared on their 3D projects. Attached are some pics of what I have done for the engine subframe assembly. Some things are layed out for space claim and checking functionality. As more info is acquired I hope to tidy up a lot of things. There are lots of questions due to limited drawings and pictures of some areas.
Areas needing information are:
1. Shifter mechanism by the driver controls. Some pics have helped but not sure of the bottom linkage
2. Radiator mounting feet
3. Engine and transmission mounting feet.
4. Differential, engine clutch configuration'
Please review and comment on missing areas and what other features missing and corrections needed. Your professional comments are welcome.
Nice work. Liking the detail. I haven't got too far in detailing, just trying to get space claim and understanding levers and pedal operations. One thing I would like to point out is the bottom side of the diff needs an input pinion shaft and shaft coupling from gearbox to operate diff. There is also some type of brake mechanism on the bottom of the diff that may brake the pinion shaft into the diff. I have been referring to GA drawing of Mark IV I got from Bovington and pics found on line. Attached is what I believe the bottom should look plus pic showing the engine, gearbox and differential assembly, Can't remember where I found pic. If not allowed administrators can remove.
Mine is still FAR from finished, to many pots on the boil....
Really interested in what you got from the tank museum.
Apparently they have 'package' of research available, but due to covid, I can't get one....
Bozothenutter, I ordered drawings from Bovington a few years ago. I purchased GA drawings for the Mark I, IV and V tanks plus the drawings for the shell assembly. Also use the Haynes Workshop manual and books from Osprey Publishing for reference. I have tried lately to get info from Bovington but no replies. I was fortunate to travel to Aberdeen Proving Grounds a few years ago before they moved the Mark IV to Fort Lee I believe.
Charlie, The inside bits and pieces are a mystery to me right now. I have searched on the internet and books and have found little info. I am assuming the diff would be be a pinion gear and crown gear. Not sure a worm gear arrangement would be able to handle the torques required. A research challenge. The big challenge is to think in early 1900 engineering.
Charlie, on second thought it would probably be a type of worm to crown gear setup as you have suggested. The geometry would not be a setup for a pinion gear. As stated need to dig a little deeper.
There is a worm gear in the bottom of the differential casing. I know this because the top of the casing from Deborah is missing and I once had the opportunity to enter the tank. The tank is now alarmed so this is no longer possible without special permission.
Yes this looks like it. thanks for posting. Is there another pic showing the differentail portion? What is the source for the picture? Looks like a parts manual.
