Cutting circle from mullite kiln shelf - WarmGlass.com

Cutting circle from mullite kiln shelf

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Warren Weiss
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Cutting circle from mullite kiln shelf

Postby Warren Weiss » Tue Feb 24, 2015 3:40 pm

Hi,
I'm planning to cut a 12" circle from the center of an old 24" by 24" by 1.25" thick mullite kiln shelf. If anyone has experience doing this I would like to know. What cutting tools should be used? How to avoid splitting the shelf? I appreciate all input.
Thanks,

Warren

jim burchett
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Re: Cutting circle from mullite kiln shelf

Postby jim burchett » Tue Feb 24, 2015 7:08 pm

If you have the split blade for the Taurus that would probably work..otherwise its gonna be tricky
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Marty
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Re: Cutting circle from mullite kiln shelf

Postby Marty » Tue Feb 24, 2015 8:02 pm

Drill a starter hole then use a drywall saw or a sabre saw. Keep it wet.

rosanna gusler
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Re: Cutting circle from mullite kiln shelf

Postby rosanna gusler » Tue Feb 24, 2015 11:24 pm

i would use a tile saw and cut a 12 or so sided shape. . r.nevermind. i was focusing on the donut , not the hole. that said, there is easier stuff to make a drop ring out of if that is what you are doing.
Last edited by rosanna gusler on Wed Feb 25, 2015 12:46 am, edited 1 time in total.
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charlie
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Re: Cutting circle from mullite kiln shelf

Postby charlie » Wed Feb 25, 2015 12:02 am

i would take a diamond blade in a 4" side angle grinder, and carefully lower the blade into the discarded piece near where the edges of the hole will be. make many cuts, and use the edge of it to round off and smooth (and probably bevel) the hole sides. make shallow cuts, deepening them with multiple passes.

this is essentially how they make on-site sink cutouts in granite countertops. if you have a water jet, or a diamond bit router, there's other ways to do this more easily.

i assume you're making a dropout shelf.

Bert Weiss
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Re: Cutting circle from mullite kiln shelf

Postby Bert Weiss » Wed Feb 25, 2015 1:44 pm

Waterjet will do it easily and perfectly.
Bert

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Warren Weiss
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Location: Richmond, VA

Re: Cutting circle from mullite kiln shelf

Postby Warren Weiss » Wed Feb 25, 2015 6:44 pm

Thanks to all for your replies. I think I will try a masonry drill bit for the starter hole and see if I can get a masonry blade for my sabre saw which I am will to sacrifice if necessary. I couldn't find a water jet shop in Richmond. The closest was in Norfolk or near DC. Yes, it is to be a large sturdy drop ring.

Warren

Valerie Adams
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Re: Cutting circle from mullite kiln shelf

Postby Valerie Adams » Thu Feb 26, 2015 2:59 pm

I'd ask Tim Yardic; perhaps he'll share how he did it.

viewtopic.php?f=3&t=41942

Bert Weiss
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Re: Cutting circle from mullite kiln shelf

Postby Bert Weiss » Thu Feb 26, 2015 3:06 pm

Warren Weiss wrote:Thanks to all for your replies. I think I will try a masonry drill bit for the starter hole and see if I can get a masonry blade for my sabre saw which I am will to sacrifice if necessary. I couldn't find a water jet shop in Richmond. The closest was in Norfolk or near DC. Yes, it is to be a large sturdy drop ring.

Warren

Warren, I would start with a pivot hole in the center, and figure out some way to keep your blade stationary. The only way to get a clean circle is to spin the shelf around an axle.
Bert



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Warren Weiss
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Location: Richmond, VA

Re: Cutting circle from mullite kiln shelf

Postby Warren Weiss » Sat Feb 28, 2015 6:10 pm

Thanks all, it worked. Drilled pilot hole near edge of circle with masonry bit. At Bert's suggestion I placed the shelf on a lazy susan to feed shelf into sabre saw masonry (diamond) blade. Finished with file. Slow, but perfect.

Warren

Peter Angel
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Re: Cutting circle from mullite kiln shelf

Postby Peter Angel » Sun Mar 01, 2015 4:23 am

I've seen a shelf with a big hole cut out of it on a glass art supplies website.

However I don't recall the site. I will see if I can find the site.

Pete
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Peter Angel
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Re: Cutting circle from mullite kiln shelf

Postby Peter Angel » Sun Mar 01, 2015 4:26 am

Peter Angel
http://peterangelart.blogspot.com/

A bigger kiln, A bigger kiln, my kingdom for a bigger kiln.

Bert Weiss
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Re: Cutting circle from mullite kiln shelf

Postby Bert Weiss » Sun Mar 01, 2015 1:57 pm

Warren Weiss wrote:Thanks all, it worked. Drilled pilot hole near edge of circle with masonry bit. At Bert's suggestion I placed the shelf on a lazy susan to feed shelf into sabre saw masonry (diamond) blade. Finished with file. Slow, but perfect.

Warren

Cool!
Bert



Bert Weiss Art Glass*

http://www.customartglass.com

Furniture Lighting Sculpture Tableware

Architectural Commissions


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