Re: [ATM] Glass cutting speed

[Kevin MIchael Zabbo <chaosopher23@yahoo.com>]

I wasn't going to say anything, but this nontechnical
description of glass cutting speeds is accurate
enough:

Cut it slow - paranoid slow, like you've just finished
smoking a really good joint with your friends and
you're driving, being followed by a police cruiser...

Kevin of Eastern Iowa
Seeker of the Darkness

--- Donald Good <donald.good@comcast.net> wrote:

> After searching thru the archives, some ATM web
> sites, and some articles in
> Advanced Telescope Making Techniques (edited by
> Allen Macintosh), I found
> that glass cutting speeds for circles can vary
> widely and still be
> successful.  Confining the search to perimeter or
> plug cutters (like hole
> saws rather than twist drill bits) and calculating
> the perimeter speed (for
> meaningful comparison) from rpm and diameter data,
> the perimeter speed
> varied from 250 inches per minute (ipm) to nearly
> 4400 ipm.
> 
> The slow speeds seemed to group around 1400 ipm and
> used "wet" loose grit
> and water in a slurry that was applied periodically
> as from a squirt bottle.
> 
> The fast speeds are a small group around 4200 ipm
> that appear to run the
> cutting edge "submerged" in a circular channel
> fashioned from clay or putty
> or something similar about an inch deep and filled
> to a depth that would not
> overflow at speed, but sufficient to act as a
> damping fluid to catch what
> would be spray or splatter from the "wet" squirt
> bottle method.  This speed
> is also reported to have the advantage of keeping 80
> grit suspended in the
> slurry (2 oz grit to 2 cups water).
> 
> To calculate rpm, choose a perimeter speed S and
> divide by pi*D: rpm =
> S/(pi*D).  Then allow some variation for the rpm
> choices on the available
> equipment.
> 
>        inches             mm
>        ipm    rpm         mmpm     rpm
> Fast   4200   1340/D(in)  106800   34000/D(mm)
> Slow   1400    450/D(in)   35500   11300/D(mm)
> 
> (above numbers rounded for convenience)
> 
> Clear skies
> 
> _______________________________________________
> ATM mailing list http://www.atmlist.net/
> 


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