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bending mica
Lynda Metcalfe -
Thursday, August 30, 2007 - 8:27am
lighting | mica I have a lighting commission that was going to use glass shades, client has just asked me to investigate mica which I have not used before. I need to shape the shade into a either half cones or shallow troughs that would be closed at both ends and I have seen mica curved for lighting but have googled forming & bending mica sheets but can't find any info .... any pointers very gratefully received! Can you form it with heat or hot water, will it drape over a form? Many thanks, Lynda Lynda, I get mica from
Rich Waugh -
Thursday, August 30, 2007 - 8:51am
Lynda, I get mica from Ashevill-Schoonmaker Mica company. They have a good range of stabilized mica sheets in various colors, and information on how to bend and form it. They are very nice folks to deal with, too. http://www.ashevillemica.com/ » reply Yep, that's who I get my
webminster -
Thursday, August 30, 2007 - 12:53pm
Yep, that's who I get my mica from also. I have them cut sheets into 9 inch by 36 inch strips for lamp shades. It's easy to form this mica if you use a hot gun. You know, the paint striping hot air guns. You could probably use a hair dryer set on high. Temperature to bend the mica is in the 110 degree Fahrenheit range. If you get the mica too hot, the shellac will become brittle. So it's best to keep the heat down to just enough to bend the mica. » reply Thank you Mark, Rich & QQ
Lynda Metcalfe -
Thursday, August 30, 2007 - 5:09pm
Thank you Mark, Rich & QQ for your replies. I had found Asheville-Schoonmaker and have ordered their sample pack but saw no info on bending & forming sheets. Have now sent them an email asking for info. I have 10 fixtures to do, ranging in size from 18x36 to 6x12, some half-cone shaped wall sconces, some trough-shaped ceiling pendant fixtures so I think the hair dryer approach may be a good one for at least the largest piece. Can't see it fitting in our oven. I am excited about using mica as I have wanted to try it before and didn't get round to it. Will also be easier handling mica rather than hand-made glass shades in our shop for fitting etc - glass in a blacksmith shop ~~~ shudder ~~~ :-D » reply Lynda, Glad we could be of
Rich Waugh -
Thursday, August 30, 2007 - 7:17pm
Lynda, Glad we could be of help to you. I cut the mica with either my table saw or a pair of shark multi-purpose kitchen shears, depending on the gauge. When cutting on the table saw, it helps to make a Z-shaped piece of sheet metal to clip on the fence so the thin sheet doesn't ride under the fence and give you a wacky cut. You can also cut the stuff just fine with a sharp craft knife. For bending, I use a heat gun on its low setting and it still takes some care not to over heat. Overheating can also be a concern in some closed fixtures, so you need to plan for adequate ventilation and/or use compact fluorescents instead of incandescent bulbs. If the mica is going to be where it can be handled, I'd recommend that you give it a quick sanding with 320 grit paper after forming and then shoot a coat of lacquer on it to gloss it back up. » reply Good info Rich. I'd like to
webminster -
Friday, August 31, 2007 - 2:55am
Good info Rich. I'd like to add that I use a paper shear like you get at Office Depot to cut the mica. The only problem if you are cutting lots of mica, that the shear will get gummed up and it's a pain to clean the gum off of the shear. I think you will find that whatever you use to cut the mica, it will eventually get a sticky gum on the blades and will cause problems in the cuts. » reply Good point about the gum,
Rich Waugh -
Friday, August 31, 2007 - 8:20am
Good point about the gum, QuiQue. The shellac-based composite sheet does leave a gummy residue which can be cleaned off with denatured alcohol or lacquer thinner. I use those cheapie one dollar scissors from Harbor Freight and just heave them when they get too nasty to work nicely. (grin) I haven't had a problem with the table saw getting nasty, but I haven't cut a thousand feet with it, either. It cuts lots of other stuff too, which probably keeps the gum scraped off the blade. » reply Good question Lynda
SteelyJan -
Friday, August 31, 2007 - 8:38am
Hi Everyone, » reply ![]() Forming Mica
visitor -
Friday, August 31, 2007 - 11:19pm
Along with the sample kit AS sends you will be instructions on how you can shape it. Also, call them with any questions. They are a good outfit! » reply Isn't Artmetal a great
Lynda Metcalfe -
Saturday, September 1, 2007 - 11:02pm
Isn't Artmetal a great resource?? I will be saving this info too. Thanks for all the comments folks, you have helped me and my client make an informed investigation of mica over glass. Lynda » reply |
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Mica
Lynda,
Most people use what is called a "stabilized mica". It is much less expensive then solid mica and can be easily shaped. Basically it is mica chips mixed with shellac. I don't have the name of a supplier but it shouldn't be hard to find on-line. I think most of the mica is mined and processed in North or South Carolina. When I was using it, I was getting it in 3 foot square sheets. It generally comes in gold or silver. I put the mica in an oven at low temp and then put it over a simple form to shape it. Be warned though that the stabilized mica does not work in high temperature and can burn because of the shellac. I would be sure and design my work with that in mind. I will try to find the name of the company that supplies it in case you are unable to.
Mark