Columbia AT take apart
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- Victor Monarch Special
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Re: Columbia AT take apart
Does it slide along nicely, then come to a hard stop, or does it gradually get tighter until it stops? The first suggests a part or burr that's in the way, the second suggests a probable pot metal distortion issue.
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- Victor II
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Re: Columbia AT take apart
Great advice all the way around.
It slides freely and with ease all the way until the end where it catches very abruptly. It does not feel like a swollen grab (if that makes sense) it it abrupt like the half nut is catching on the inside of the tube. The half nut is disengaged from the feed screw. The reason I am taking it off, is that the carriage has swollen and will not smoothly track in the grove that is located in the bed plate. So I need to file that part down a bit, but I cannot get the darn thing out.
It slides freely and with ease all the way until the end where it catches very abruptly. It does not feel like a swollen grab (if that makes sense) it it abrupt like the half nut is catching on the inside of the tube. The half nut is disengaged from the feed screw. The reason I am taking it off, is that the carriage has swollen and will not smoothly track in the grove that is located in the bed plate. So I need to file that part down a bit, but I cannot get the darn thing out.
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Onlinephonogfp
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Re: Columbia AT take apart
When you try to slide the carriage off the feedscrew sleeve, the half-nut will catch at the end of the slot of the feedscrew sleeve. It's a simple technique to accomplish your disassembly.
1) When the lift lever is pushed down, it lifts the reproducer PLUS it pushes down the half-nut to disengage it from the feedscrew. But it won't push it down far enough to clear the slot of the feedscrew sleeve. Here's a picture of the half-nut on an AT:
2) You'll need a thin-bladed screwdriver. If you don't have a thin-bladed screwdriver, don't mess with this until you do. I bought a good-quality set of screwdriver bits and handle at Wal-Mart for ten bucks. It has served me well for ten years.
You'll need to CAREFULLY insert the thin blade of the screwdriver between the half-nut and the bottom of the lift lever, right in the center:
3) Now CAREFULLY angle the blade of the screwdriver so the half-nut is depressed a bit further than the lift lever can depress it. The half-nut can now clear the end of the sleeve.
Just be careful and you should be fine. Good luck!
George P.
1) When the lift lever is pushed down, it lifts the reproducer PLUS it pushes down the half-nut to disengage it from the feedscrew. But it won't push it down far enough to clear the slot of the feedscrew sleeve. Here's a picture of the half-nut on an AT:
2) You'll need a thin-bladed screwdriver. If you don't have a thin-bladed screwdriver, don't mess with this until you do. I bought a good-quality set of screwdriver bits and handle at Wal-Mart for ten bucks. It has served me well for ten years.
You'll need to CAREFULLY insert the thin blade of the screwdriver between the half-nut and the bottom of the lift lever, right in the center:
3) Now CAREFULLY angle the blade of the screwdriver so the half-nut is depressed a bit further than the lift lever can depress it. The half-nut can now clear the end of the sleeve.
Just be careful and you should be fine. Good luck!
George P.
- Curt A
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Re: Columbia AT take apart
Thanks George, for that useful information for future projects... It definitely makes sense...
"The phonograph is not of any commercial value."
Thomas Alva Edison - Comment to his assistant, Samuel Insull.
"No one needs a Victrola XX, a Perfected Graphophone Type G, or whatever you call those noisy things."
My Wife
Thomas Alva Edison - Comment to his assistant, Samuel Insull.
"No one needs a Victrola XX, a Perfected Graphophone Type G, or whatever you call those noisy things."
My Wife
- fran604g
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Re: Columbia AT take apart
Excellent advice (as always) George!phonogfp wrote:When you try to slide the carriage off the feedscrew sleeve, the half-nut will catch at the end of the slot of the feedscrew sleeve. It's a simple technique to accomplish your disassembly.
1) When the lift lever is pushed down, it lifts the reproducer PLUS it pushes down the half-nut to disengage it from the feedscrew. But it won't push it down far enough to clear the slot of the feedscrew sleeve. Here's a picture of the half-nut on an AT:
2) You'll need a thin-bladed screwdriver. If you don't have a thin-bladed screwdriver, don't mess with this until you do. I bought a good-quality set of screwdriver bits and handle at Wal-Mart for ten bucks. It has served me well for ten years.
You'll need to CAREFULLY insert the thin blade of the screwdriver between the half-nut and the bottom of the lift lever, right in the center:
3) Now CAREFULLY angle the blade of the screwdriver so the half-nut is depressed a bit further than the lift lever can depress it. The half-nut can now clear the end of the sleeve.
Just be careful and you should be fine. Good luck!
George P.
Best,
Fran
Francis; "i" for him, "e" for her
"Even a blind squirrel finds a nut once in a while" - the unappreciative supervisor.
"Even a blind squirrel finds a nut once in a while" - the unappreciative supervisor.
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Onlinephonogfp
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Re: Columbia AT take apart
Curt A wrote:Thanks George, for that useful information for future projects... It definitely makes sense...
There must be some positive outcome for all the mistakes I've made over the years...fran604g wrote: Excellent advice (as always) George!
Best,
Fran
George P.
- Curt A
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Re: Columbia AT take apart
Mistakes are part of the learning process... learning 100s of things that don't work...
"The phonograph is not of any commercial value."
Thomas Alva Edison - Comment to his assistant, Samuel Insull.
"No one needs a Victrola XX, a Perfected Graphophone Type G, or whatever you call those noisy things."
My Wife
Thomas Alva Edison - Comment to his assistant, Samuel Insull.
"No one needs a Victrola XX, a Perfected Graphophone Type G, or whatever you call those noisy things."
My Wife
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- Victor II
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Re: Columbia AT take apart
Outstanding! I believe that is exactly what the problem is. I will try to tackle it in a minute and post a follow up!
Update: Touchdown! That is exactly what was holding it. It is now apart, thank you.
T
Update: Touchdown! That is exactly what was holding it. It is now apart, thank you.
T
phonogfp wrote:When you try to slide the carriage off the feedscrew sleeve, the half-nut will catch at the end of the slot of the feedscrew sleeve. It's a simple technique to accomplish your disassembly.
1) When the lift lever is pushed down, it lifts the reproducer PLUS it pushes down the half-nut to disengage it from the feedscrew. But it won't push it down far enough to clear the slot of the feedscrew sleeve. Here's a picture of the half-nut on an AT:
2) You'll need a thin-bladed screwdriver. If you don't have a thin-bladed screwdriver, don't mess with this until you do. I bought a good-quality set of screwdriver bits and handle at Wal-Mart for ten bucks. It has served me well for ten years.
You'll need to CAREFULLY insert the thin blade of the screwdriver between the half-nut and the bottom of the lift lever, right in the center:
3) Now CAREFULLY angle the blade of the screwdriver so the half-nut is depressed a bit further than the lift lever can depress it. The half-nut can now clear the end of the sleeve.
Just be careful and you should be fine. Good luck!
George P.
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Onlinephonogfp
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Re: Columbia AT take apart
Glad it worked for you. Good luck with the rest of your restoration!
George P.
George P.
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- Victor II
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Re: Columbia AT take apart
Thank you!
phonogfp wrote:Glad it worked for you. Good luck with the rest of your restoration!
George P.