[CAUT] Fwd: Does V S Profelt work in reverse?

[Mark Cramer]

Thanks Roger, 

 

I guessed this was their reasoning, and perhaps like the graphited bushing
cloth, wonder if this is something that should be challenged? 

 

I have two reasons:

 

1.) It does snag the cloth on the way out. 

 

Quality parts should expect to be serviced, and we wouldn't accept a nicked
pin with bushing fuzz from an Associate on an exam

 

2.) It doesn't work. 

 

In my experience, if the initial friction passes muster without re-pinning,
I will still find the walking silver gleaming at me from between the flanges
within the first year of use, ridges or no. And I hate to be brand
specific/critical, perhaps other brands have this ridge as well. However,
there seems to be some common characteristics of some *brand new parts* that
seem to run together, and it drives me nuts!

 

1.) Brand new parts with an initial friction of 1g or less. (I'm not scared
of 1g, but at least give me some margin!)

 

2.) Brand new parts at 5 or 6 grams that drop to 1g or less, with even the
mildest friction treatment. (did I mention margin?)

 

3.) Brand new parts with .05025" pins that immediately need to be upsized to
a .051" (# 21) pin, before they can even be installed, and are now only an
upsize or two away from a re-bushing job. (GRRRRR!)       

 

4.) Brand new parts with .05025" pins that are even looser in the birds-eye
than they are in the bushing. and this most certainly includes the
center-pins with the ridge in the centre.

 

Though I share Wally's fascination that such delicate parts can be made at
all, and to the tolerances that they do, I have to wonder if there isn't
room for improvement, and if that little ridge might have more to do with
ease of manufacturing, than simply making our lives all the richer. ;>)
Maybe?  

 

Best regards 

Mark Cramer, RPT

Brandon University

 

PS Congratulations Roger, on your Knabe project! I think you will do
something amazing with this wonderful old marquee.  

 

 

  

 

 

  _____  

From: caut-bounces at ptg.org [mailto:caut-bounces at ptg.org] On Behalf Of Roger
Jolly
Sent: April 8, 2009 8:25 PM
To: David Ilvedson; caut at ptg.org
Subject: Re: [CAUT] Fwd: Does V S Profelt work in reverse?

 

At



Anyhow, while I sit here and ponder all this can anyone explain the
necessity of that ridge/burr at the center of a Renner center-pin? 
 


Hi Mark,
             It prevents the pin from walking out of the bird's eye.

Regards Roger

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