|Jul 06, 2009, 11:42 AM|
Z Drives revisited
Many of you know of my dislike of the Graupner Z drives following my use of them in WW.. They are plastic construction and the design leaves a lot to be desired.
Seeing as I am in need of a pair of Z Drives for a 'Modern style Harbor Tug' I have designed and am currently building (yes, there will be a build thread ), I decided to see if i could design and build my own Z Drives.
I've long been a fan of Algie's work on his drives and his work on the DSV Seawell, so i spent some long hours studying his work...
I also came across a design for a Z drive by Cadmonkey over on RC Universe...
Then i discovered Milan's work on the Checkoslovakian MONAKO site..
Milan was good enough to send me his CAD drawings.. but i thought they were over complicated and not easy to make.
.. and after a discussion with Tug Boat Andy, he discovered that the bottom end gears for the Graupner drives were available as spares. Thanks Andy, that saved me a lot of work!.
So armed with all three 'ideas'... together with some thoughts of my own, I designed my own drives and began to do some machining.
The Korts and Prop's came first..
Wondered what those were for eh?..
I'm currently at the stage of machining the end cap's and have to machine the drives for the bearings for all of the shafts.
As yet, i have not decided what motor's to use to run the drives with.. but i do have a matched pair of Pittman's that might be able to take the strain..
|Jul 06, 2009, 06:33 PM|
Very nice....now stop being a tease and give us the play by play. Detailed MACRO pics are required as well...
I like...you taking orders?
|Jul 06, 2009, 11:25 PM|
I can take some more pics when i get a little more done..
Taking orders?... Can you afford my time Mr Boatfox?..
|Jul 07, 2009, 12:29 AM|
Very nice,... Glad you finally found enough information to give you
the confidence to proceeed.
However, I think the graupner gears are acually part of the problem...
|Jul 07, 2009, 07:24 PM|
Today's efforts have been to install the bearings in the end casing of the bottom housing and the bearings in the bottom of the vertical housing.
I've also cut the thread on the end of the bottom drive shaft so i can add the props. They need a nut behind the prop yet though.
I have managed to source some rubber 'O' rings for the top end of the vertical housing.. and am about to order up some gears for the top of the vertical drive shaft..
Seeing as I'm planning on powering these Z drives with a pair of Pittman's (@ 4000rpm max) should i still be thinking in terms of a 3:1 reduction for the gearing from the motor to the top of the drive shaft, like the Graupner drive's have?...
.. and a closer view for Mr Boatfox..
|Jul 07, 2009, 08:22 PM|
Your drives are certainly looking good so far - mmmm, shiny brass...! What are you joining all the bits together with, for instance, bits like the bottom bulb and the outer vertical shaft? Also, are they Milan's plans behind your first pictures, or your modifications of his plans?
|Jul 07, 2009, 09:20 PM|
Joined Apr 2007
Holy smokes, Toes! That looks incredible! You've been busy AS always watching with keen interest. I know how hard you have been working on this but you still make this look easy.
Umi - is that the 'gear stripping problem' you mention? I thought I read on a German site that the problem had been solved.
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