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#21
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If it was more stable to have no pivot, wouldn't all load bearing things like forklifts be solid? Ever roll a shop crane around with a heavy load? What happens when one wheel comes off the ground? It want's to act like a teeter-totter, which swings the thing you are picking up like a pendulum.... Or try's to tip. Except a shop crane moves by you pushing it. It doesn't count on having the drive wheels stay in contact with the ground. |
#22
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I tested lifting the rear off the ground with the center pivoting front axle, result was it tilted left/right very dangerously even on level ground. a non pivoting front axle it is much more stable. Your forklift example is not relevant, it has the center pivoting weldmon axle is on the rear. So the problem will be if a rear tire lifts off the ground; tire flex will take care 99% of uneven terrain. I've been considering splitting the brakes to individual left/right or possibly some type of a selectable locking differential if I really have any issue. maybe you shouldn't look. |
#23
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#24
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I don't know which type brake is on your tractor. Probably the spot brake that won't even stop you on a hill is one wheel loses traction. Some later Cubs came with a disc brake caliper on each wheel. They weren't great brakes but would give you some stopping power if you lifted one wheel. I think you did nice work on that project. |
#25
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I started to read your build on the A Model. I didn't get past the brakes and you had me worn out with your detail work!
I'll get back on it later when I have time. |
#26
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Build it the way you want to build it, you don't have to satisfy or justify what your doing to every member here.
The Cub Cadet Cops can just learn to look away. If your lifting something really heavy and do not plan on moving once lifted, you could have outriggers that would take the load too. |
#27
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Don’t, it’s not worth your time. He’s like the bad kid in a nice family. Always looking for attention.
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#28
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Yeah... it's attention I crave. You guys are pathetic. I see a legit design flaw, but there's about 4 of you who think I'm a jerk so you have to throw in your rag. Get a life.
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#29
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Hmmm, I should let a sleeping dog alone, but here goes.
Given the talent of the builder and the attention to detail of the work he does, by looking @ some of his pix of his street rod work, I'm reasonable confident he will not over tax the limitations of the crane. I spent a lot of years rigging and do see the limitations of the design especially if a load is swung to the side. Personally, I think he went to a lot of work for the little safe capacity of it,but I do not know what purpose he had in mind, possibly lifting small motors into a GT?? It will work on a flat surface, but I'd would of stayed with a pivot axle. A pair of light outriggers as mentioned, will go a long ways to side lift stability. I do know a 50' mobile manlift basket we had @ work with solid axles was pretty useless on anything but flat surfaces, many times we had to help it along using the extendable boom to make it move over irregular indoor surfaces as a wheel would slowly, uselessly spin. Do be careful and safe |
#30
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thanks all for the replies;
I understand lifting "Too Heavy" items and/or driving on "Uneven Terrain" will have dangers and/or problems. I'll test and find it's usable limits once operational and make changes as needed. I like the idea of outriggers, or possibly re-doing front axle with a pivot. it has rear disc brakes and looks like I could split them to a left and right pedals to stop individual wheel spin if I lift a rear tire (but I'm hoping the pneumatic tires will flex enough for my driveway, shop, garage etc.......) enough typing.... I need to make an orbital valve mount and start routing hydraulic lines. |
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