[CAUT] Jack speed, (was Tight balancier

[Jeff Tanner]

On Nov 13, 2006, at 11:43 PM, Fred Sturm wrote:

> So I started out, expecting to increase by a half
> size, with minimal burnishing, and occasionally a wee bit of  
> reaming. I
> found, however, that when I inserted that half size larger pin, it  
> was way
> too tight, and required a good bit of reaming to get down to 4 - 6  
> gm. <snip>

> Then I went back to my earlier flanges, and, lo and
> behold, they were back to 1 - 2 gm. Bizarre, no?
> <snip again>

> Ed Foote recently noted that he was
> pinning jacks to 6 gm or so, but they got looser soon after. Is  
> this maybe
> just the nature of this beast, that within fairly close parameters  
> these
> centers are slick enough that friction will just want to go down to  
> 1 - 3?


Fred,
You mention reaming to get down to 4-6 gm.  Reaming introduces heat,  
which, I would think, would swell the felt.  As the felt cools, it  
would seem there would be a tendency towards lower friction.

Just a theory,
Jeff
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