Spring loaded cutter

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I'm looking for a spring loaded cutter to put on a cnc gantry machine. I
could use a pneumatic actuator to apply the correct pressure but I'm looking
for simple. Is 15 psig the correct pressure for most stained glass? Also,
can I use my engraving head to cause the fissures by just cutting too deep?



Re: Spring loaded cutter

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looking
deep?

I'm sure this can be done.  But, one question:   WHY?





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Re: Spring loaded cutter
Well for me it is a way to avoid using pneumatics in order to apply a,
mainly constant, pressure (15lbs) in the Z axis. Pneumatics are noisy. I
would have thought a spring loaded cutter would be available for beginners
to apply the right amount of pressure to the mainstream of glass without the
experience to "know" how much pressure to apply.

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Also,



Re: Spring loaded cutter

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the
I

I think you missed the point of my "WHY".....

What are you trying to accomplish that takes a CNC machine to cut the glass
with?

If you are trying to cut lots of repetitive pieces, the fact that you have
scored them with a machine still hasn't gotten the parts broken out of the
big sheet, which has to be done by hand anyway.  Secondly,  given the
"grain" of the glass and the color patterns and artistic considerations of
where to put the pattern onto the glass sheet, the idea of mechanically
cutting the glass is counterproductive from where I sit, both from an
artistic and expense point.  If you are trying to cut intricate parts,  you
probably won't be able to break them out of the glass anyway,  unless you
make relief scores on the inside curves.  And if you have tight outside
curves, the glass is likely to run off your score...right across another
part the machine has scored.  If you are planning on putting small pieces of
glass in the CNC machine and mechanically holding them in place for the
machne to score the glass.....I promise you any competent SG worker can keep
pace with the machine with a lot less waste.

If you are interested in cutting out many multiples of the same part,  as in
mass producing lamp shades,  you need to be looking at water-jet cutting,

If you are interested in making lots of "square" pieces out of one big sheet
of plate glass....look in the CRLaurence catalog for the automated cutters.
They have machines that will take a stock sheet and make lots of smaller
pieces, minimizing waste.



Re: Spring loaded cutter
I thank you for all of the good information. It sounds challenging. I will
grant you that no machine process can duplicate the artistic element
required for professional grade stained glass. I am a machinist, not an
artist. I just want to be able to set my zero and let the machine give me
the same part, over and over again.

I do want to cut multiples of the same part and I want to nest cuts from the
same sheet. I would go with a waterjet but these machines are extremely
expensive.
Are you saying that there is no algorithm which can be developed to decide
how to cut a sheet of glass depending upon how the part is shaped? That
would be depressing.



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beginners
machine.
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cutters.



Re: Spring loaded cutter

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the

I have no idea if such an algorithm exists.  But I wouldn't hold my
breath......

If you were planning on making "identical" parts from the same sheet, you
could put them side by side, then have the machine make a dividing score
between the rows, and then score another set, side-by-side.  I suppose you
could also have the machine do a dividing score between the parts, so that
you could break apart the little rectangles and then weed out the scrap that
surrounds the part.

How big is the table for this machine?  You'll likely have to cushion the
table with some carpet between the glass and the table.



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I
without
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glass?
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have
the
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cutting,



Re: Spring loaded cutter
The table has a 2' X 3' travel and I imagined having a 1/2" felt table with
a vacuum underneath.
How about just routing the whole thing?

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me
decide
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smaller



Re: Spring loaded cutter

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K.D.:

There are CNC fabric and leather cutting machines used by apparel
manufacturers that would
have an algorithm of use to you.

Regards,

Edward Hennessey



Re: Spring loaded cutter
That depends on what you mean by "extremely expensive" you are already
considering CNC as an option, so you are already in the cost relm of a
waterjet.  Complete installed machines with training and spare parts
and everything can be had new for as low as $80,000, though you may
want a slightly larger machine for $100-$150 or so.

With abrasivejet, there you can cut just about any shape.  Modern
controllers take care of how to slow down for the corners and such, so
you don't need special black art knowledge about how to actually vary
the cutting based on the shape of the glass piece.

The only draw-back is that when piercing the glass (like to cut a
hole), there is some chance of cracking.  Most of the time it's fine,
but with some glass it can be dificult to pierce without cracking
(mostly glass that was cooled quickly, I think.  Also tempered glass
is impossible.)

Of course, you can also cut marble, metals, etc, which can be really
cool to mix with the glass.

You might want to check out:

http://www.omax.com/glass.html

Or to learn about the technology in general, my web site at:

http://www.waterjets.org

Here are a bunch of pictures of abrasive waterjet cut glass parts:

http://www.omax.com/sw_eng/lowres/images/OMAX_Glass_Flamingo_Palm.JPG.html
http://www.omax.com/sw_eng/lowres/images/OMAX_Dichroic_Glass.JPG.html
http://www.omax.com/sw_eng/lowres/images/OMAX_Waterjet_QuartsDragon1.jpg.html
http://www.omax.com/sw_eng/lowres/images/OMAX_Waterjet_QuartsDragon2.jpg.html
http://www.omax.com/sw_eng/lowres/images/OMAX_Waterjet_Glass_Spring.jpg.html

(The glass spring is particularly interesting, I think)

If you want more info, feel free to send me an email
( snipped-for-privacy@waterjets.org).  I also have lots of pictures and stuff
that is not posted to the web, but probably should be, including some
really cool glass inlays and fusions that were done on an abrasivejet.

- Carl.

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Re: Spring loaded cutter
kdoney wrote:
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They make machines that have a weight above the cutter to apply the
pressure. I doubt it's as high as 15 lbs.

Jack


    http://photos.yahoo.com/bc/xmissionbobo /

Re: Spring loaded cutter

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looking
deep?
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   You're describing what we called in the 70's, an odd shaped glass cutting
machine. My brother designed and used one for years making duplicate lamp
pieces. A stylus followed an engraved pattern in plexi, and the cuttter,
using a pantograph system, scored the glass. I don't remember the PSI we
used, but it worked on a very small compressor. I believe they are still
being old. Google it.

--
JK Sinrod
Sinrod Stained Glass Studios
We've slightly trimmed the long signature. Click to see the full one.
Re: Spring loaded cutter

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Also,
cutting
BillCo machinery??



Re: Spring loaded cutter

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I
lamp

  Yes. I hear they also have a wonderful instructional tape. If you ask them
nicely, they send it to you in a few days. Very punctual and men of their
words too!

--
JK Sinrod
Sinrod Stained Glass Studios
We've slightly trimmed the long signature. Click to see the full one.
Re: Spring loaded cutter

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them

ROTFLMAO!!!



Re: Spring loaded cutter

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their
OK, I guess I got that coming,

Will include invoice in shipment..... Did I ever mention how much that was
going to be??



Re: Spring loaded cutter

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ask
I thought it was going to be a 50 year old bottle of scotch.  And a bright
red XXL tee shirt.



Re: Spring loaded cutter
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was
That's it!!  I knew it was substantial, just couldn't remember how much.



Re: Spring loaded cutter

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their

  You're not helping me by ganging up on him Moon... just for that, yours
will be twice the price of mine.

--
JK Sinrod
Sinrod Stained Glass Studios
We've slightly trimmed the long signature. Click to see the full one.
Re: Spring loaded cutter

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ask

Probably not...I'm holding his rebar bender hostage.



Re: Spring loaded cutter
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yours
It's not like its my first born...  You thought I only had one?  When I make
tools, I make a few, should see my lamp tables, for building them, not
displaying..



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