Quote:
Originally Posted by IKE
The prinicple Art was getting at is over-constraining a system. A good example is a 3 legged vs. 4 legged table. A three legged table does not rock. It may not be level, but it does not rock, even on an uneven surface. A four legged table is very tricky to not have it rock. This is because 3 points make a plane. 4 points overconstrain. With a stiff driveshaft, 2 bearings will constrain the shaft in all planes except for possibly concentric sliding (you need a collar or a lip of a clip). If you try to do 3 bearings, and they are not perfectly aligned, the 3rd bearing may fight with the other two and cause stress in the bearings which will cause them to fail early.
As far as critique goes, what does the "spool" of your winch look like (from a size perspective). I know that 20:1 for a 2" Diameter spool was just about right for a fast lifter that would meet your desired rating. What DIA are you using for your spool?
I too am a bit worried about the cantileer of the spool driving element as shown. How is it supported? Also, will this be another overconstrain on that shaft?
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I understand, I think ill opt for a 2 plate design with frequent standoffs. As for the spool, the gear ratio is designed for a 2" diameter spool. It will be mounted almost right next to the plate of the gearbox, so correct me if I'm wrong, I don't think that that should be much of a concern. I have also started redesigning with a ~8.5:1 ratio; the math tells me its more that enough to lift 60+ lbs at ~56 in/sec with one RC, that's calculated with the fork assembly factored in too, and ~36 in/sec with a full 6 stack, and this is with two winch assemblies of course. All the tips I received are coming in really helpful, so I'm great full for that.