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Author Topic: floating crane "Greif"  (Read 2194 times)

ballastanksian

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Re: floating crane "Greif"
« Reply #25 on: July 01, 2019, 08:36:25 PM »

Super work! I have never seen a gearbox case made before.
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derekwarner

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Re: floating crane "Greif"
« Reply #26 on: July 02, 2019, 12:00:21 AM »

Yes Ralph, images are here....


We see about 2.2:1 straight cut gear ratio [16/36?] in your manufactured reducer, but the coding for the Gearbox motor CCH2230 does not confirm the actual reduction ratio


I imagine the luffing of the crane boom would be very slow?.....


What speed do you plan?....or is the threaded bar the worm drive?


[I have seen these drives in old Dockyard cranes......the mechanism is called Bottle Jacks and they usually work in pairs]


Derek
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Derek Warner

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taucher

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Re: floating crane "Greif"
« Reply #27 on: July 02, 2019, 06:19:30 PM »

itīs simply a motor and my gearbox ratio 1:3 . I even  tjink 6V be enough, should not whip.


the best Image I have



Ralph

derekwarner

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Re: floating crane "Greif"
« Reply #28 on: July 02, 2019, 11:20:02 PM »

This is the casing tube that the Bottle Jack 'worm rod' rotates in......


Depending on the arrangement, many Dock Yard crane luffing mechanism is controlled by this Bottle Jack


The axis of the casing tube is dependent on the angle of luff from the lower to the upped extensions, hence the angle of arc shown


So either the gearbox with the worm rod is pivoted, or the worm wheel is pivoted and the casing stays fixed etc


Derek
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Derek Warner

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www.ils.org.au

Southern Sailor

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Re: floating crane "Greif"
« Reply #29 on: July 03, 2019, 07:34:35 AM »

Ralph, when designing a gearbox like that, how do you know what centres to use for the gears? Regards. Brian
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taucher

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Re: floating crane "Greif"
« Reply #30 on: July 03, 2019, 05:09:28 PM »

everything pivotet, yes . The gearbox at the boom and the treaded rod at the structure.


@ Brian
oure german dealer  has anny tables to calculate this [size=78%]https://www.maedler.de/product/1643/1618/1034/2739/stirnzahnraeder-aus-polyketon-modul-1[/size]


here "d" half, of both gears. if you like learn about gears


https://www.youtube.com/watch?v=F-vcdvqg-zk


https://www.youtube.com/watch?v=qVN2jrn4Kuo


this guys experts  :-))


Ralph

Southern Sailor

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Re: floating crane "Greif"
« Reply #31 on: July 04, 2019, 07:31:28 AM »

Thank you Ralph. The tables will come in handy.  By the way I have often thought about how to drive the rotation movement of a crane.  A worm drive would be ideal from a speed point of view but otherwise not at all appropriate.  Rather normal gearing for this function.  Haven't looked through your blog yet so it may have been considered here already. Cheers for now. Brian
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Southern Sailor

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Re: floating crane "Greif"
« Reply #32 on: July 04, 2019, 08:31:25 AM »

Also really useful videos.  Thanks.  :-))
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taucher

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Re: floating crane "Greif"
« Reply #33 on: July 12, 2019, 09:02:12 PM »

now you kan see al the pivotes. I use a geared motor now, make 300 rpm

https://youtu.be/GSYFcDeSt4I
Ralph
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