[CAUT] center pinning changes/ long pin method

[Fred Sturm]

Hi Joe,
	I cut them in half, one set for the university, the other for home  
shop. I didn't find I needed that much length, but others might. I  
tried pulling the whole length all the way through, and just found it  
too clumsy and unhandy to do. The half length was better, but I  
decided for the time being I like the back and forth action better. I  
actually use about 8 inches at this point, back and forth very rapidly.
	It is really nice to have the full set of sizes, in part so I could  
make Mannino style broaches for the full range of pins (roughed up a  
short section with a file) for when I do need to remove some material.
Regards,
Fred Sturm
University of New Mexico
fssturm at unm.edu



On Sep 11, 2007, at 11:33 AM, Joe And Penny Goss wrote:

> Hi Fred, Those were made special for you. Always wondered if you  
> liked them. Now know.
> Joe Goss RPT
> Mother Goose Tools
> imatunr at srvinet.com
> www.mothergoosetools.com
> ----- Original Message -----
> From: Fred Sturm
> To: College and University Technicians
> Sent: Tuesday, September 11, 2007 10:31 AM
> Subject: Re: [CAUT] center pinning changes/ long pin method
>
> Hi Jim,
> Can you describe the long pin method? We discussed something along  
> those lines on this list a while back, but I never got all the  
> details. I understand one is using pins long enough to go through  
> several flanges, but I'm not clear how exactly one proceeds. Does  
> the whole length of the long pin get pushed through the bird's eye  
> of each flange? That seems awfully cumbersome and potentially a bit  
> destructive.
> Joe Goss has long burnishers - very long as in a meter or so - for  
> all American sizes of pins, and those can be used as you describe  
> for pulling through the bushing. I must say I am a bit skeptical  
> about the idea that it makes much difference doing the pulling in  
> one direction, but maybe you're right.
>  In burnishing center felt, it seems to me that the burnisher is  
> going to be pressing against the felt hard enough that fibers  
> wouldn't be able to move around, at least significantly. At this  
> point in my own work I mostly do a rapid back and forth action,  
> fast enough and enough of them to create a good bit of heat. (You  
> can get heat pulling the burnisher through all the way rapidly,  
> but  I think I get more heat faster by doing back and forth, as the  
> metal of the burnisher heats up). That seems to set the felt quite  
> nicely. And it seems to be possible to move up a half size to a  
> full size just using burnishing action without removing any felt,  
> just the ironing action. I haven't been doing it this way long  
> enough to have a good sense for longevity and whatnot, but it seems  
> to be good so far. Certainly makes sense, as long as the felt in  
> the bushings doesn't swell later, maybe due to humidity rise, and  
> make the centers sluggish, and I haven't found that in university  
> pianos, which get quite a bit of use. Of course I am dealing with  
> my own humidity environment, which is typically 10% to 60% range.
> Regards,
> Fred Sturm
> University of New Mexico
> fssturm at unm.edu
>
>
>
> On Sep 10, 2007, at 12:48 PM, Jim Busby wrote:
>
>> Hi Ted,
>>
>> Just some feedback on the "long pinning method" you mention below
>> (Thanks Jurgen!). I have been doing this for quite a while now and it
>> seems to have much more longevity and be more stable than other  
>> methods.
>> I think it is because the long pin pulls one direction through the
>> center, thus "combing" the fibers in one direction and packing  
>> them in
>> tight. When I use other back and forth burnishing techniques and  
>> "shake
>> down" the parts the grams may go from say 5 to 4 or 3 until they  
>> become
>> immovable. With the long pinning method there is no "shaking down"
>> necessary or possible. Either way is good and can be done to  
>> perfection,
>> but this "European way" is becoming my preferred method because of  
>> this
>> instant and permanent stability and better longevity. Better  
>> Longevity
>> means that I repin about every 3-4 years instead of every 2-3  
>> years. It
>> may be even better than that because I'm at about 4 years since I
>> started using the method and some are still good!
>>
>> Regards,
>> Jim Busby BYU
>
>

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