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#1978916 - 10/26/12 01:51 PM Pin-Tite/CA  
Joined: Apr 2008
Posts: 2,481
Emmery Offline
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Emmery  Offline
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Joined: Apr 2008
Posts: 2,481
Niagara Region, On. Canada
Anyone have experience based results on how a pinblock will fair on CA treatment after it has had some dope used on it in the past(years ago). Are the residues of one incompatable with the other?


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George Brown College /85
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#1979078 - 10/26/12 08:13 PM Re: Pin-Tite/CA [Re: Emmery]  
Joined: Sep 2006
Posts: 3,919
Supply Offline
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Supply  Offline
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Joined: Sep 2006
Posts: 3,919
Vancouver Island, BC, Canada
I have not done this myself, but I have heard technicians on the PTG list say CA after dope works fine.

#1979079 - 10/26/12 08:14 PM Re: Pin-Tite/CA [Re: Emmery]  
Joined: Jun 2001
Posts: 4,491
Bob Offline
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Bob  Offline
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Joined: Jun 2001
Posts: 4,491
Florida
You mean pin tight applied first, then CA? I'm sure I've applied CA in that situation and never had any issues.

#1979220 - 10/27/12 09:13 AM Re: Pin-Tite/CA [Re: Emmery]  
Joined: Jul 2010
Posts: 440
James Carney Offline
Full Member
James Carney  Offline
Full Member

Joined: Jul 2010
Posts: 440
new york city
I've used CA on a previously doped block in a console, and it worked perfectly. I don't know if it was Pin-Tite or another brand of dope, but whatever had been done many years before was a hot mess. The stuff was all over the plate and coils, and it obviously hadn't worked because overall the piano was 200 cents flat, some notes were a major 3rd flat, and my tuning lever was spinning like a propeller before I applied CA.

I discussed with the owner beforehand, and explained that it might not work, and she was fine with that. But it worked just like any other CA application I've done, it's been about a year and all is well...



Keyboardist & Composer, Piano Technician
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http://jamescarneypianotuning.wordpress.com/
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#1979236 - 10/27/12 10:15 AM Re: Pin-Tite/CA [Re: James Carney]  
Joined: Jan 2010
Posts: 849
Chuck Behm, CPT-E Offline
500 Post Club Member
Chuck Behm, CPT-E  Offline
500 Post Club Member

Joined: Jan 2010
Posts: 849
Boone, Iowa, USA
Hi all - I'm a big believer in using C.A. in situations where repinning or a new pinblock is not an option, and have had much success with it, including a couple of pianos (a console and a small grand) which had been previously treated with either Lundsford's or Garfields - I'm not sure which but they had been done by me several decades ago and I used both when that was all that was available. The C.A. brought about a much better result.

If you would like to take a look at the brochure which I give out to my customers to explain the process,click on the following title: C.A. Treatment of a Loose Pinblock.

By the way, an effective demonstration of the chemical process which C.A. produces is to take a paper towel, crumple it and apply several drops of the glue to the surface. Within a matter of seconds the paper will be hot and stiff, because (I believe) of a reaction between the glue and the wood fiber in the towel. Depending on the brand of paper towel, you might even get a whiff of smoke. This is a very easy way to show that there is a real effect that takes place.

Best wishes, all. Chuck Behm


Tuner/Technician/Rebuilder/Technical Writer
www.pianopromoproductions.com
515-212-9220

"The act of destruction is infinitely easier than the act of creation" - Arthur C. Clarke
#1979286 - 10/27/12 01:09 PM Re: Pin-Tite/CA [Re: Emmery]  
Joined: May 2003
Posts: 1,676
Ed Foote Offline
1000 Post Club Member
Ed Foote  Offline
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Joined: May 2003
Posts: 1,676
Tennessee
Greetings,
I am positive that the CA causes the wood to swell, and I know it cannot shrink the pin, since the pin is incompressible, so yes, there must be some compression of wood against wood. I also think that the CA serves to reduce the elasticity of the wood, and elasticity is required for compression to be effective, otherwise a few rotations of the pin could grind the surface and it would lose torque. Think of a metal pin rotated in stone as an extreme example.

However, I wonder if, perhaps, a significant factor in the increased torque is due to the increased effective surface area of the hole. If the CA actually is strong enough, on an intercellular scale, to create a lot more working surface for that pin to turn against.

In any case, it sure does work, I have several 5 year old jobs that still tune beautifully, whereas before, souping through a "Garfield's Restored" block was a miserable chore.
Regards,

#1979287 - 10/27/12 01:10 PM Re: Pin-Tite/CA [Re: Chuck Behm, CPT-E]  
Joined: May 2003
Posts: 1,676
Ed Foote Offline
1000 Post Club Member
Ed Foote  Offline
1000 Post Club Member

Joined: May 2003
Posts: 1,676
Tennessee
it is also dramatic to squirt a dose on a cotton ball. Be ready for combustion.


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