Re: [ATM] (not) grinding with diamond

["Bob May" <bobmay@nethere.com>]

You really want to make the pressure on the disk to be more a
rigid position than so many pounds of force.  You don't want to
take off more than the thickness of the blade (you'll get nasty
little slivers if you go beyond) at each pass but that shouldn't
be all that many passes unless you're doing something really
deep.  The rotation of the glass needs to be an elastic rate at
which the glass is nicely ground off the surface, probaby
something in the range of a half inch at the edge of the glass
per minute.
Running the disk faster will make the cutting of the curve faster
but you quickly run into the problem of throwing the water and
glass dust all over the place.  You can fix this a bit by putting
up a tall dam to keep the splash in the work area and providing
positive flow of water (even do the job under water) so that the
disk doesn't get dry.  A diamond disk will cut for a long time as
long as it isn't overstressed by getting dry or feeding too fast.
Those diamonds are only held in there by mechanical forces and
when the stress or temp is too high, the metal holding them in
place will fail.  If you're seeing flashes or sparks from the
cutti8ng surface, you're going too fast with the cutting rate.
Bob May
bobmay at nethere.com
http: slash /nav.to slash bobmay
http: slash /bobmay dot astronomy.net
Replace the obvious words with the proper character.

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