View Full Version : Leslie motors time saving tips see pictures
salvage a harness from a LSI Leslie, cut speaker leads and instal 2 plugs....great tester for adjusting motors
reverse the small motor bolts.... when you are doing spring adjustments this can save hours
Secure motors for testing high voltage can kill
1615 test leads and one inverted motor bolts beside standard Large stack
1616710 temporary lower rotor insert from spinet (large stack)
1617Hammond Hauler test bench for adjusting slow/fast:->
M101, 710 and 125 under wrap in the garage.
I am just doing the rotation motor job on my dining room table, the inverted bolts on the small motor make it a breeze. LSI, horn and rotosonic motors were all going the same direction. This bolt in rotor mod will cost me $0 and will do the trick till I find a cheap 40W tube amp and wood rotor. No cutting of 710 cabinet at all, just the LSI Leslie hole made bigger and all the LSI goodies are hidden by the speaker and old Rotosonic plate.
Stoked on this one.
06-12-2011, 05:28 PM
What does LSI stand for? And would you mind 'splaining a bit more what's going on? Like how you're saving hours on spring adjustment. Is that because you're mounting them to the bench instead of removing/adjusting/installing/removing/adjusting/installing? What's the purpose of the harness? Can't you just plug the motors into an extension cord? What's the airspeed velocity of an unladen swallow? ;)
LSI is a Large Scale Integrated Circuit Hammond spinet, in my case a 8200 that had a large motor 8" Leslie that I removed before fixing the organ and passing it on. Many connecting plugs, many failed connectors. Value <0 but still and nice organ when fixed.
When using the salvaged harness to rebuild, adjust and repair 3 identical motors with the same 6 pin plug still attached it is safer to adapt a harness to prevent shock.
Changing rotation means turning the armatures 180* in the motor frame, tedious at best but better then carving into the Leslie to hang the motor the other way or crossing belts.
reversing the small motor bolts allows pulling the rear off the small motor to make minute spring adjustments, Likely #1 cause of speed/motor issues.
Putting the motor in and out moving amps is time consuming, hard on the back and risks component damage.
A test rig means the motor is 100% first time in.
Using the harness you can CAREFULLY hold the motor in the correct position if you don't have a test rig.
Using the baffle board from the LSI organ (non-tonewheel) Hammond means NO changes to the cabinet which I may wish to restore to Rotosonic (speaker rotates instead of baffle)
It also allows final motor and belt adjustment outside the organ.
Terminal velocity flying straight down, the other directions too many variables.
Have a:-> Day
cut the baffle board out (badly and waiting for the paint to dry (no one will see it but...)
1634NOTE: don't do 45* cuts for bass ports as severe as I did as i accidentally cut off one drum bearing screw socket, Took a little tinkering to fix that one. (metal mending plate)
board has 1-1/4" x 1/8" foam around perimeter for acoustic dampening
Motor/belt adjustment thru rotosonic access plate.
This thing is going to Rock!!!
The motors both fired up in the correct rotation, changed speeds flawlessly and are running very quiet.
One fully rebuilt quiet, large frame motor stack for spare....priceless!
Dicking around time saved (and back pain)several hours I think IMHO based of past attempts.
Access to the motor adjustment screw is 4 bolts for the rotosonic bearing plate....once the back panel is off.
Happy Happy Joy Joy
06-14-2011, 03:30 AM
Ha,ha, ha! Well played, sir. Well played.
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