suzanne
Posts: 689
Joined: 3/29/2009 Status: offline
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Congratulations, you are off to a good start! You now have a proto-type. I don't know from tumblers but when you have any kind of motor set up it is good to have a steel frame to mount it on, welded up nice and square, and bolted down to the floor with concrete anchors. Angle iron works good for this. Even little motors are very torque-y and shake a wood frame apart sooner or later. Everything has to be nice and level and plumb in order not to become unbalanced. You would not want your tumbler set up to shake loose from the floor and go lurching down the street like Godzilla, would you? Oh, no, there goes Tokyo! You can use a pulley to reduce motor speed to whatever you want within manufacturers limits. The formula is: Divide actual motor speed by the speed you would like the load to run at This has to equal - driven pulley diameter divided by your motor's pully diameter In this hypothetical case "x" is the driven pulley diameter that you want to find out Example - let's say your motor runs at 1800 and you want to cut speed in half to 900. Go get calculator. 1800/900 = X/6 Cross multiply. 1800 times 6 is 108,000. Now divide by the motor speed you desire which is 900 108,000 divided by 900 is 12 You need a 12 inch pulley. I don't know if that's how actual tumbler guys do it but you could ask some. Who knows, maybe you could catch one in a good mood. Maybe they just go out and buy a slow motor. Speed is determined by line frequency (60 hz) and number of poles that motor has>the more poles the slower it can go but the more expensive it will be. The copper cutting jig looks like someone snagged a random piece of iron with a groove in it somewhere and drilled holes in it to insert copper . The important thing would be that it is square so it can be bolted down, and the feed holes for the copper be straight and have a precise tolerance for whatever guage of wire so you get a square cut. You would need to drill the little wire holes using a drill press to keep them straight. Everything I just said is opinion so if anybody sees a problem with it they should probably help this guy out so I don't give him bad ideas.
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