Sunny Day! This comment is off Mac's original topic but deals with Edley's comment regarding thermal expansion. What I use for a number of my models is GE RTV100 Series Silicon Rubber Adhesive Sealant. It is what I used for gluing the card stock Shepherd's sundial to the paper tube used for the body. I also used it to glue plastic laminated card stock to strofoam board for a number of other sundials. You don't have to worry about being messy because after it sets all you have to do is rub off the excess. Also it stays pliant so variations in temperature are not likely to result in the paper getting loose. You can get it in small tubes or larger ones for caulking guns. I apply it in thin lines and rub it out smooth with my finger. In many cases you can still move the paper to align it if applied incorrectly.
If the cylinder azimuth sundial was printed on normal paper and then laminated that would give a durable dial. It can then be glued to the cylinder using RTV. However, if the cylinder diameter is small, the dial plate may want to pull away at the joint because the RTV needs time to set. A method of holding the joint area against the cylinder would help. I just kept pressing it down as the RTV set until it held. Happy Dialling! Carl Sabanski www.mysundial.ca "Get Hooked on Gnomonics!" -----Original Message----- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] Behalf Of Edley McKnight Sent: Thursday, May 17, 2007 9:10 PM To: Mac Oglesby; Sundial List Subject: RE: Waterproof papers Hi Mac, Tyvek seems to work OK. It is hard to print on, requires special inks. One of the big problems I've found with the cylinder dials using the edges for gnomons is expansion with temperature changes. i.e. the paper gets loose. I made a slit in a cylinder, pulled the paper through and fastened it using stretchy stitching to the central rod. Dye transfer seems to work, but has faded quite a lot. If you find something better, please let me know. The paper has to be very bright and very smooth. There are a lot of folks making printed cylinder dials of one kind or another, maybe they will tell us their secrets. John probably means the Mylar drafting film, some of it seems to be very white, some not. Best Wishes, Edley. > Thanks, John, > > I'm sure Mylar is great for certain applications, but doesn't work at > all well for mine. I seek a durable material for use on a cylinder > azimuth dial, where the sunbeams form two light/shadow boundaries, one > at either side of the cylinder. I've tried Mylar, clear plastic, and > plastic overlays on paper, and in each case the light/shadow boundary > is quite indistinct. > > Best wishes, > > Mac > > > > > >Use Mylar!!! > > > >This is a translucent stiff milky white plastic paper. Your local > >blueprint shop can plot onto Mylar. I use it a lot. (it cost more > >than bond paper however). You can get it wet and it won't shrink, > >expand, or tear and the ink does not wash off except with acetone. > >Great Stuff! I used it on my design transfer to the wall for my > >painted wall sundial. > > > >I do not know if it works in your computer's printer because your > >computer printer probably uses ink that will smear if wetted with > >water. And computer ink may not stick to it. I have never tried it > >in my office printer. I have only had the blueprint shop plot onto > >it using their printer that is made for Mylar. > > > >John > > > > > >-----Original Message----- > >From: [EMAIL PROTECTED] > >[mailto:[EMAIL PROTECTED] On Behalf Of Mac Oglesby Sent: > >Thursday, May 17, 2007 10:54 AM To: Sundial Mailing List Subject: > >Waterproof papers > > > > > >Hello Friends, > > > >Probably I'm among the last to learn this, but there are several > >different brands of waterproof, durable papers available. A Google > >search on "waterproof paper" turns up lots of leads. One of the > >better URLs is: > > > >http://www.igage.com/WeatherP.htm > > > >Have any of you used waterproof paper for dial faces? Any comments to > >share? > > > >I'm starting to experiment with one brand (Lat 26) and have samples > >on order from igage. > > > >One possible BIG problem is a report that at least one brand of > >waterproof paper deteriorates after two or three months of exposure > >to bright, outdoor sunlight. Not what a dialist wants to hear! > > > >Best wishes, > > > >Mac Oglesby > > > > > > > > > > > > > > > > > > > > > > > > > > > >--------------------------------------------------- > >https://lists.uni-koeln.de/mailman/listinfo/sundial > > --------------------------------------------------- > https://lists.uni-koeln.de/mailman/listinfo/sundial >
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