The 'glue' used to stick car mirrors is actually a very strong double sided sticky pad. Available from replacement car windsrceen fitters. David. > > From: "John Carmichael" <[EMAIL PROTECTED]> > Date: Fri 25/Jul/2003 17:52 CEST > To: <[email protected]> > Subject: Re: SGS Gnomon Attachment > > Hi Tony: > > That's great information to know. I have a feeling the bolting method > through glass or the metal structure would be better than the "car mirror" > method. > > I wonder what method the glassers use to drill glass? I'll have to ask > them. But, you know what I'm gonna do? I'm going to try to drill a hole the > same way I drill holes in stone using a high speed diamond sphere with H2O. > But I have no intension of make stained glass sundial windows myself. But I > might try some stone inlays someday. > > > John L. Carmichael Jr. > Sundial Sculptures > 925 E. Foothills Dr. > Tucson Arizona 85718 > USA > > Tel: 520-696-1709 > Email: [EMAIL PROTECTED] > Website: <http://www.sundialsculptures.com> > ----- Original Message ----- > From: <[EMAIL PROTECTED]> > To: "Sundial Mail List" <[email protected]> > Sent: Friday, July 25, 2003 8:14 AM > Subject: Re: SGS Gnomon Attachment > > > > John Carmichael asked: > > > > > >What do you think is the best method to attach a metal rod gnomon to a > > >stained glass sundial window? > > > > > >It's the most frequent question I've been getting from the "Glassers". I > > >do have an article that Mike Cowham sent me that mentions that in the > > >seventeenth century, a threaded gnomon was usually bolted to a hole cut > in > > >the glass. Of course that resulted in a lot of cracked glass and missing > > >gnomons, especially if the glass was thin. > > > > > I've no practical experience of attaching gnomons to glass but would like > > to experiment with: > > > > 1. modern adhesives to attach a gnomon with a small baseplate. If it > > drops off after twenty years just clean it up and re-attach. The glues > > used to stick interior mirrors on car windscreens would be a useful > > beginning perhaps? > > > > 2. attaching through a drilled hole with e.g. a 20mm brass disc on each > > side of the glass and soft vinyl washers in a sort of 'sandwich' squeezed > > gently tight with a nut on the inside. The gnomon could be silver > > soldered to the outer disc before assembly. Twin bolts would prevent > > rotation. > > > > A very safe way to 'drill' glass is to use a short piece of thick-walled > > copper tube of e.g. 6mm outer diameter with a few radial sawcuts in an > > electric drill. > > Garages are a good source of the right stuff. > > > > Place the glass flat on a firm/soft supporting surface, e.g. cork, and > > build a tiny 'dam' around the intended hole site with Plasticene. Mix a > > little turpentine with carborundum powder, place a few drops within the > > dam and you can abrade a neat clean hole in no time but reduce the > > pressure at breakthrough or the hole edges may flake. A thin piece of > > wood with a 6mm hole will guide the tube until it begins cutting after > > which it is just gently lifted and replaced to refresh the abrasive. > > > > Have fun > > > > Tony Moss > > - > > > > > - >
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