Hammond scanner project for any audio sources..

[jpdesroc]

I'm in a project that uses a surplus B3 Hammond Scanner/RUN motor combo.
I know this motor 'normally' won't start by itself
but after a start motor began to make the tone generator spins. OK.
I want to use my scanner/vibrato-line for any audio musical source
other than an organ.. I already know some diyers on the net
used a scanning method by electronic circuits mean but I'll stick
with the old rotary scanner/RUN motor combo for mine.
My question is how can I get this RUN motor to start
by itself in my project. Is there a 'capacitor starter' trick
I could add just at the start to initiate the motor ?
This motor will only drive its associated scanner.
Any suggestions welcomed.
Thanks.
J-Pierre

[enor]

Winding fishing line around the shaft and giving it a pull is a tried-and-true way of emergency starting a Hammond when the start motor won't work. You need to spin it up to get torque! Otherwise - just use a self-starting Hammond motor from an L-100, E-100 or T-100 series organ.

[Wes]

Hey, Enor - does it matter which way you wrap the line? Or is the synchronous motor bi-directional?

Wes

[UncleClark]

It must be turning the correct way to work with the delay line. Otherwise the delays will be scanned backwards.

[enor]

I've never quite had the guts to try starting it in the wrong direction so I can't say!

[UncleClark]

The more I think about it if the scanner scans down the delay line and back each revolution it might work turning either way. We need a science experiment!

[MihevicB3]

Hey, Enor - does it matter which way you wrap the line? Or is the synchronous motor bi-directional?
Wes

It is bi-directional. I have an old Hammond clock that you have to give a "kick start" spin to get it going. It you spin the knob in the opposite direction, the clock will run backwards.

John M.

[Wes]

*excellent*

Now I can see what an Australian M3 sounds like, first-hand! :D

On a more serious note, I am tempted to try this, but for no good reason. The TG gears all appear to be straight-cut, so should turn backwards fine. I wonder how the clutches would deal with this? Maybe it will let them release some of the gunk that is causing my tone 49 wobble?

Wes

[enor]

It might also dislodge/unwind a few of the cotton oil wicks. I wouldn't do it.

[Wes]

Hm. Good thinking, Enor. I think will take your advice.

Wes

[indianajo]

If I wanted to use a scanner as an effect, I would disconnect the alignment coupler and put a round belt pulley on it. Then you could mount any motor near it with a round pulley, and use any appropriate 1/8 or 3/32 o ring as a belt. A vary speed fan motor might be an interesting driver. 8 mm shafts and 5/16" shafts are very close in size. You can buy round pulleys, and o-rings if you need them, from mcmaster.com. Make sure you check the rotation direction before you put the belt on, as previously noted. fan and all induction motors only turn one way.
If you wanted absolute scan frequency stability, a turntable motor with a combination induction/synchronous motor could be a driver. Some turntables also have variable speed motors, a cheap way to start into this effect.

[BlueOliveB3]

It might also dislodge/unwind a few of the cotton oil wicks. I wouldn't do it.

Nah. The wicks are on the outside of the bushing. The shaft is on the inside of the bushing. The bushing does not turn at all. Wouldn't affect the oil wicks one bit. :)

[jkrusel]

Use a self-starting Hammond synch motor like from an L, E or T, don't forget to replace the capacitor it is probably near the end of its life. In fact the T motor if it is from a 400 or 500 will already have a pulley on the back side of the motor to run a loo roll scanner with a belt.

[enor]

Correct me if I'm wrong, but doesn't a 60Hz T-series motor turn at 1800 rpm? (while the B3 scanner is supposed to run at 1200)

I am unsure about the L-100 and E-100 series though.

[Wes]

Don't all 60Hz generator main shafts turn at the same speed?

It is my understanding that there is some kind of reduction gear in the vibrato scanner <> TG shaft assembly, but I haven't actually looked for myself.

Wes