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Old Jul 06, 2009, 11:42 AM
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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...
http://www.rcgroups.com/forums/showthread.php?t=709484
http://www.rcgroups.com/forums/showthread.php?t=524835

I also came across a design for a Z drive by Cadmonkey over on RC Universe...
http://www.rcuniverse.com/forum/m_8463955/tm.htm

Then i discovered Milan's work on the Checkoslovakian MONAKO site..
http://translate.google.com/translat...istory_state0=
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..
http://www.rcgroups.com/forums/showthread.php?t=1025555
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..
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Old Jul 06, 2009, 11:44 AM
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Oooooooo....
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Old Jul 06, 2009, 06:33 PM
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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?
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Old Jul 06, 2009, 10:01 PM
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geez ralph, you really know how to make a guy sick.












very nice.
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Old Jul 06, 2009, 10:05 PM
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toes,

what is/are the diameter of the props?
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Old Jul 06, 2009, 11:25 PM
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Quote:
Originally Posted by Boatfox
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?
You want a "drill hole 'A' and turn down to Dia. 'B'.... and cross drill 3/8.." type report..

I can take some more pics when i get a little more done..

Taking orders?... Can you afford my time Mr Boatfox?..

Quote:
Originally Posted by tsenecal
toes,

what is/are the diameter of the props?
The props, turned down are 2 1/2"
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Old Jul 06, 2009, 11:31 PM
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sounds like TBW has a sideline making Z-drives!
Foo
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Old Jul 06, 2009, 11:34 PM
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Quote:
Originally Posted by fooman2008
sounds like TBW has a sideline making Z-drives!
No, its a Sherline lathe / milling machine.. and some design flair...

http://www.sherline.com/
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Old Jul 06, 2009, 11:42 PM
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Nice!
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Old Jul 07, 2009, 12:29 AM
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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...
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Old Jul 07, 2009, 09:00 AM
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Nice work.
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Old Jul 07, 2009, 01:57 PM
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Cool prodject there Toes. Can't wait to see what you are really going to be putting them in!!
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Old Jul 07, 2009, 07:24 PM
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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..

Just wondering..
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..
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Old Jul 07, 2009, 08:22 PM
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Quote:
Originally Posted by toesup
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...
You too, huh toes. I too have plans on doing something like this, but no proper design yet, so I'll be watching with interest! I'm planning on trying nylon gears from SPI in mine, I've got a lot of the parts together but I haven't started yet, gotta finish my Al Khubar tug build first.

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?

Phillip
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Old Jul 07, 2009, 09:20 PM
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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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