Re: [ATM] Glass cutting speed

[Jarvis Krumbein <jkoptic@juno.com>]

A  way to cut from both sides and get good alignment of the cuts is easy.
 Before making the first cut and before puting  the glass on the table
under the cutter, use the cutter to make a fairly deep grove in the
table.  Use a piece of wood on the surface of the table to protect it if
using a drill press and cut the groove in the wood.  Now put the glass on
the table and make the cut at least half way through.  Take the glass off
the table and put splines into the groove in the table so that when you
put the glass, now with the cut side down, back on the table the splines
will align the glass so the cut will come out perfectly.  

Another way  to prevent breakout when cutting from one side only is to
attach a piece of scrap window glass using wax to the the back side of
the piece being cut.  Go slow when breaking through and cut well into the
scrap glass.  Gentle heating will soften the wax enough to be removed. 
The cut will be perfect.

Jarvis Krumbein

On Fri, 24 Mar 2006 16:55:15 +0000 Richard <cnc@cncservo.co.uk> writes:
> Hi Dave,
> 
> Friday, March 24, 2006, 3:58:08 PM, you wrote:
> 
> DS> If at all possible, you want to put (cut? file?)
> DS> notches in your metal band to allow the grit and water
> DS> to drop down into the groove in the glass and stay in
> DS> constant contact between glass and cutting tool
> 
> I'd say Castelate, but maybe that's an English word ;)
> 
> I just cut through 1-1/4" thick Zerodur at 2-1/2" diameter at
> 250RPM and it took about 7 or 8 minutes. I wasn't as careful as
> I should have been breaking out the other side, but it was just
> a trial... I would doubly echo your warning on breaking through
> carefully, and even cut from both sides if possible, although
> you may get a slight step at the join. Plenty of water - both
> for lubrication and to keep the dust down.
> 
> Double sided tape works well, both for holding a water container
> to a pillar drill table and for holding the blank to the bottom
> of the container. Suitable containers may be found in the
> kitchen, but use stealth or ask permission from SWMBO first...
> 
> -- 
> 
> Best regards,
>   Richard in the UK
> 
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> 

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