Post by rykk on May 6, 2012 23:03:44 GMT -5
Hi, y'all - I watched a video on u-tube last night where the guy was demonstrating a Reciprolap. Looks like it is set up with the motor running a pulley that has a shaft with a weight on it rather than the weight being directly attached to the motor's shaft. My question is, how is the motor/belt/pulley set up? ie: Is the belt just left kinda loose so that the pan that's attached to the pulley/weight assembly is able to do its jiggy thing? I didn't see any sort of spring mounting on the motor, which is bolted to the main base/frame of the Reciprolap.
I have an old Lortone 20" "jiggle pan" that I bought very used. The reason I'm asking is that I'm getting REALLY tired of trying to minimize the up/down axis bouncing from the excessive end thrust of the motor - which I fixed with washers in the motor - coupled with the offset weight on the motor shaft not spinning in a perfectly horizontal plane. I've been unable to get a decent polish on ANYTHING ever since the motor I replaced the original with died and I found a used one (3M-576 Dayton) that looks exactly like the original. I fixed the motor that died but it had always required attaching a fan blowing upwards into it that it wouldn't go into thermal protection shutdown in these wretched Florida summers - a real p.i.t.a - so I haven't wanted/needed to put it back on. I've tried all 3 oxides to no avail. Things were just fine until a couple months ago. I can get a decent shine if the rock I'm doing is like a 5+ pounder. I'm *guessing* that maybe my problem is the up/down bouncing of the pan is so excessive that all but the heaviest of rocks (yes, I put rocks as weights on the smaller ones) of the rocks end up spending 50% of the time with the inertia created by the pan going downward causing them to be virtually weightless or even airborne and sorta skipping along the top of the polish pad. Ive got the rig running really quiet but the impetus for the the bouncing is still there. You just can't hear it.
Anyhow, it's got me seriously thinking of just tearing this old Lortone down and setting it up with the motor running a pulley/weight assembly that jiggles a pan suspended by springs from 4 posts like a homemade one that I saw on u-tube.
Thanks,
Rick
I have an old Lortone 20" "jiggle pan" that I bought very used. The reason I'm asking is that I'm getting REALLY tired of trying to minimize the up/down axis bouncing from the excessive end thrust of the motor - which I fixed with washers in the motor - coupled with the offset weight on the motor shaft not spinning in a perfectly horizontal plane. I've been unable to get a decent polish on ANYTHING ever since the motor I replaced the original with died and I found a used one (3M-576 Dayton) that looks exactly like the original. I fixed the motor that died but it had always required attaching a fan blowing upwards into it that it wouldn't go into thermal protection shutdown in these wretched Florida summers - a real p.i.t.a - so I haven't wanted/needed to put it back on. I've tried all 3 oxides to no avail. Things were just fine until a couple months ago. I can get a decent shine if the rock I'm doing is like a 5+ pounder. I'm *guessing* that maybe my problem is the up/down bouncing of the pan is so excessive that all but the heaviest of rocks (yes, I put rocks as weights on the smaller ones) of the rocks end up spending 50% of the time with the inertia created by the pan going downward causing them to be virtually weightless or even airborne and sorta skipping along the top of the polish pad. Ive got the rig running really quiet but the impetus for the the bouncing is still there. You just can't hear it.
Anyhow, it's got me seriously thinking of just tearing this old Lortone down and setting it up with the motor running a pulley/weight assembly that jiggles a pan suspended by springs from 4 posts like a homemade one that I saw on u-tube.
Thanks,
Rick