I worked for year plus in NE Ohio and was taught by a Hammond tec. First the scanner is a rotating capacitor and the oil changed the value of the capacitor. I could, it one time, could rebuild and be out of the house in two hours. Yes, I had new spacers with me and gave them away after I stopped doing service work. To many people would over oil the organ. There was one one time that I found an organ that was not oiled at all. I sent the tone generator back. Still I enjoyed see the video once again. I worked on the organ in the early 70's.
My ‘47 CV is about due for a scanner cleaning. This video helps immensely. It’s absolutely insane the level of complexity that goes into these machines.
@zappatx The string is simply wrapped and tied around the bearing. These bearings are made out of a porous material that acts like a sponge; it sucks the oil from the string to maintain a film of oil at the contact surface. Hammond uses cotton string. I have heard people use a heavy gage cotton thread successfully. I have also read details of a Hammond tech that tested nylon thread, and reported that it transferred oil as well as the cotton. I was able to salvage the wick from scrapped organs.
@birdwing98 Thanks for the kind words. As a machinist, I always thought it was SOP to put the lockwasher under the screw head. However, every scanner, without exception, that I have worked on has the lockwasher under the terminal. I think, in the grand design, that it really does not make much difference in this particular application, as there is not much vibration, and the chance of the screw working loose is pretty slim...besides, it has worked for the last 50 yers or so, right?
Sir, You are a scholar and a gentleman! Thank you for producing this wonderful video. Excellent job of editing to keep it short and to the point. One question though, shouldn't the lock-washer go next to the screw head, and not underneath the wire terminal?
Bob, excellent video, especially how the wick wraps around the felt at the end. In my video 'How to Fix a Hammond Drawbar' I've had 2 folks point out that the oil wick out of the scanner oil reservoir on the right side is missing. You can see it at 5:50 into my video. What can I do do replace the wick? I'm assuming this goes down to the generator shaft but not sure how it connects to the shaft or what kind of material to use for the wick. I'd appreciate your help and advice. Thanks.
That wick is nothing more than a heavy cotton thread, available at a fabric store. The thread comes out of the oil tub and is simply wrapped around the bearing and secured with a knot. Look closely at the bearing, which is hard to see between the disc and the motor, you will note that the bearing has a groove in it. The trick is wrapping the thread around the bearing and tying the knot. Forceps or tweezers help. Since this bearing is so accessable, you can just oil it manually every few months.
Hi Bob, first off great camera work and detail. I am new to organs. I have a M102. Not too long ago I saw on another channel a video fixing the scanner for reason the organ's vibrato had developed an issue he describe as "motor Boating" A electrical device was used one by one to each contact and after he was through the "motor boating vibrato issue had been resolved. I figured he had done something similar to demagnetizing Reel to Reel recording heads. Maybe a Demagnetizer, designed for an organ vibrato scanner? Did your organ have this Motor boating type sound issue? the reason for your rebuild. Did you also have to demagnetize your parts? Bob I told you I was new, and I might have a lot of wrong notions how things work. Is the "motor boating" a common term with organ repair.
That noise has no basis in magnetic fields. The scanner is an air capacitor. The noise is caused when any one of those parts are grounded. The insulators sometimes get wet with oil, and the oil attracts contaminants, mostly loose zing whiskers that form on all galvanized surfaces. That is why cleaning is required.
so the 'bathtub' isn't attached to that screw?...I just got a 1958 M-3 and the bathtub was wedged under the tone generator...it is really stiff....wouldn't turn at all at first....now it's finally turning but its still very stiff
I am not sure what you are describing, Ed. The "bathtub" is held in place by a screw, on top of the motor. What is stiff? the scanner, motor, or Tone Genny? Until it all turns very freely, it will not function.
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I worked for year plus in NE Ohio and was taught by a Hammond tec. First the scanner is a rotating capacitor and the oil changed the value of the capacitor. I could, it one time, could rebuild and be out of the house in two hours. Yes, I had new spacers with me and gave them away after I stopped doing service work. To many people would over oil the organ. There was one one time that I found an organ that was not oiled at all. I sent the tone generator back. Still I enjoyed see the video once again. I worked on the organ in the early 70's.
My ‘47 CV is about due for a scanner cleaning. This video helps immensely. It’s absolutely insane the level of complexity that goes into these machines.
Thank you very much for taking the time to do this video.
Thank you. Excellent work
A true watch repairer work !
,💪Gracias!!!
@zappatx The string is simply wrapped and tied around the bearing. These bearings are made out of a porous material that acts like a sponge; it sucks the oil from the string to maintain a film of oil at the contact surface.
Hammond uses cotton string. I have heard people use a heavy gage cotton thread successfully. I have also read details of a Hammond tech that tested nylon thread, and reported that it transferred oil as well as the cotton. I was able to salvage the wick from scrapped organs.
Again very good job and very useful, if you ever come across fixing a T-Model scanner please TH-cam it as well, since those are build quite different.
@birdwing98 Thanks for the kind words. As a machinist, I always thought it was SOP to put the lockwasher under the screw head. However, every scanner, without exception, that I have worked on has the lockwasher under the terminal.
I think, in the grand design, that it really does not make much difference in this particular application, as there is not much vibration, and the chance of the screw working loose is pretty slim...besides, it has worked for the last 50 yers or so, right?
Great video 11 years later!
Great video - thank you!!
Sir, You are a scholar and a gentleman! Thank you for producing this wonderful video. Excellent job of editing to keep it short and to the point. One question though, shouldn't the lock-washer go next to the screw head, and not underneath the wire terminal?
Bob, excellent video, especially how the wick wraps around the felt at the end. In my video 'How to Fix a Hammond Drawbar' I've had 2 folks point out that the oil wick out of the scanner oil reservoir on the right side is missing. You can see it at 5:50 into my video. What can I do do replace the wick? I'm assuming this goes down to the generator shaft but not sure how it connects to the shaft or what kind of material to use for the wick. I'd appreciate your help and advice. Thanks.
That wick is nothing more than a heavy cotton thread, available at a fabric store. The thread comes out of the oil tub and is simply wrapped around the bearing and secured with a knot. Look closely at the bearing, which is hard to see between the disc and the motor, you will note that the bearing has a groove in it. The trick is wrapping the thread around the bearing and tying the knot. Forceps or tweezers help. Since this bearing is so accessable, you can just oil it manually every few months.
Hi Bob, first off great camera work and detail. I am new to organs. I have a M102. Not too long ago I saw on another channel a video fixing the scanner for reason the organ's vibrato had developed an issue he describe as "motor Boating" A electrical device was used one by one to each contact and after he was through the "motor boating vibrato issue had been resolved. I figured he had done something similar to demagnetizing Reel to Reel recording heads. Maybe a Demagnetizer, designed for an organ vibrato scanner? Did your organ have this Motor boating type sound issue? the reason for your rebuild. Did you also have to demagnetize your parts? Bob I told you I was new, and I might have a lot of wrong notions how things work. Is the "motor boating" a common term with organ repair.
That noise has no basis in magnetic fields. The scanner is an air capacitor.
The noise is caused when any one of those parts are grounded.
The insulators sometimes get wet with oil, and the oil attracts contaminants, mostly loose zing whiskers that form on all galvanized surfaces. That is why cleaning is required.
so the 'bathtub' isn't attached to that screw?...I just got a 1958 M-3 and the bathtub was wedged under the tone generator...it is really stiff....wouldn't turn at all at first....now it's finally turning but its still very stiff
I am not sure what you are describing, Ed. The "bathtub" is held in place by a screw, on top of the motor. What is stiff? the scanner, motor, or Tone Genny? Until it all turns very freely, it will not function.
how to clean busbar
What connects the oil string to the bearing? Is that replaceable and if so what type of string would you use?