Chris,
The 3M scouring/sanding products are fine for their intended application, but watch out on chrome as they will take off the plating if you are not careful.
Regards,
Jim Narlesky San Jose, CA
----- Original Message ----- From: Chris Andrews <andrews@tenforward.com> To: <classicrendezvous@bikelist.org> Sent: Monday, February 04, 2002 3:12 PM Subject: [CR]Chrome polishing and thread standards
> The recent discussion of hub and BB standards appeared to ignore the fact
> that ANY machine dimension has a tolerance and an allowance between itself
> and the mating part, (as between a bolt and a nut). allowance, whether
> stated or not. That's why there are different grades of the same bolts in
a
> good hardware store. The cheaper grades are made for a relatively sloppy
> fit, and the expensive grades may have a tighter "class" of fit. The
> tolerance is the set of dimensional limits, (someone mentioned 1.370 and
> 1.375). The 1.375 is PROBABLY the upper limit, and the part is still
within
> the standard id it is five thousandths smaller (1.370). Obviously, the
> largest possible diameter for the male part must be smaller than the
> smallest possible diameter for the female part, so when we talk ablut a
"one
> and three-eighths diameter hub-to-freewheel thread, that is a NOMINAL
> dimension, rather than something a machinist would work to. You can be
sure
> that the drawings the manufacturer uses have a tolerance or a pair of
limit
> dimensions for every diameter that has to mate with something else. (Many
> of you will already know all this, but those who toil outside the
> manufacturing fraternity may not.)
> As for scrubbing chrome, has anyone tried #M scouring pads? I
recently
> found that 3M, ( who make sandpaper and Scotch tape products) are now
> marketing versions of these kitchen pads in equivalent sandpaper grades.
> Chris Andrews in Sequim,
WA