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#1
13-02-10, 00:05
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A caution when planning the rotating widget
Keep in mind that the hydraulic jacks are single acting, in other words they push beautifully but do a poor job resisting being pulled.
For the turning mechanism you might want to look at a worm gear. Worm gears have a quite high reduction ratio and don't generally drive back from the load, only from the input to the worm. Of course, if the load is perfectly balanced it should only need enough force to overcome the friction in the support........ 
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#2
13-02-10, 01:04
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One purpose built rotisserie I saw on the internet was the pinnacle of engineering and is what got me started on wanting one. It was for the M151 MUTT and was probably designed for the military. It would mount the whole vehicle, complete with wheels. It has a worm gear with hand crank to rotate the vehicle 360 degrees and had a full base frame with castor wheels. The ends had a series of mounting points to allow the centre of gravity too be relocated as the weight of the mounted vehicle varied. That was a rotisserie!
I had a silo unloader winch that I was thinking of using for the rotating mechanism. I opted for simple and managed to guess close enough to the centre balance point that was quite manageable. Bob, I would think that you should be able reason out where a box would balance. It's just basic physics. Put half the steel on top and half on the bottom. I know that sounds glib, but just sit and look at what you want mounted. Take your time, consult with your engineering team, and it will probably be close. Gord
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#3
13-02-10, 04:31
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I'm hooked.....
Vertical bottle jack are single action much like a regular jack...... by playing carefully with the release valve one should be able to lower the assembly safely...... but to be safe I would drill holes through the vertical tubing and insert a 5/8 standard hitch pin..... at worst it would only fall to the next hole/pin.... spaced every 4 to 6 inches.....
The whole idea of the vertical jack is to lift a wide assembly so it can turn 180 degrees and not touch the bottom rail(s).... and then lowered to a suitable working level...... My preference would be a worm drive......(mix and match between an auto tranny ring gear and a trailer winch worm) .... dual bottom rail... mounted on inflatable tires to negotiate loose ground around the barn.... home made screw jacks on all 4 corners to take weight off tires and keep it steady... .... and painted OD. I think I have some small surplus reduction gear box....offset 90 degrees..... 20 to 1 ..? not sure if they are worm drive... will need to search the barn.... Then after Grant finds them and hides them again....he will ask me how much is it worth to tell me were it is...... Stuart... I usually get dreams/visions of what is coming up for sale at PA..... and while at it why just make one..... taking orders.... would you like fries with that sir!!!! Boob
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Bob Carriere....B.T.B C15a Cab 11 Hammond, Ontario Canada
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#4
13-02-10, 05:26
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rotisserie
If you are not planning on doing a lot of restorations you could probably do this type.
Last edited by Paul Singleton; 12-01-20 at 16:35.
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#5
14-02-10, 02:30
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You'd need some pretty tall stools to sit around that picnic table.
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Terry Warner - 74-????? M151A2 - 70-08876 M38A1 - 53-71233 M100CDN trailer Beware! The Green Disease walks among us!
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#6
14-02-10, 03:44
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Hammond Picnic Tables
Quote:
Between the CMP; newer MIL vehicles; 6 pounders from the S&P museum; bonfires; bren carrier rides; BOOB's BBQ is the main event in the Ottawa Valley. Cheers! Stuart
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Deep in the Cold War Bunker of Doom
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#7
14-02-10, 16:44
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Did you hear that Terry????
....better show up.....
Boob
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Bob Carriere....B.T.B C15a Cab 11 Hammond, Ontario Canada
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