[jlsmith5963]

Knowns & Unknowns

The challenge is trimming the arch rail to the exact width at the exact angle which, when combined with the bottom rail, will produce a square frame.

These things I know. The interior width of the gate should be slightly wider than the copper panel which is 24" (because I don't want to mess with cutting the copper). The width of the arch must be exactly the same width of the bottom rail. The sides of the arch rail must be parallel. And the most important thing, the centerline of the arch rail will be in line with the centerline of the bottom rail.

So how to cut the arch? Simply use the bottom rail to line up the arch (top) rail.

First cut the bottom rail to width and draw a centerline. Set it on a cutoff sled flush the edge (hopefully square to the blade) of the rail to the edge of the sled.

Transfer the centerline from the bottom rail to the cutoff sled.

Line the centerline of the top and bottom of arch rail with the line on the cutoff sled. Fill the angled gaps at the top with the cutoffs from the glue up.

Clamp and cut and admire the results.

Oooooooooh! Ahhhhhhhhh!

Tim-
Looking at the arch template in the last picture (it may be just a distortion of the view angle) it makes me wonder whether the two arcs are concentric or has the same arc been copied. Copied arcs sometimes end up looking a little odd (the eye can be a very precise judge). A better explanation of what I am talking about can be found in this video http://garymkatz.com/Video/segmented_radius_illusion2.wmv

good luck with the project

 

[jlsmith5963]

Knowns & Unknowns

The challenge is trimming the arch rail to the exact width at the exact angle which, when combined with the bottom rail, will produce a square frame.

These things I know. The interior width of the gate should be slightly wider than the copper panel which is 24" (because I don't want to mess with cutting the copper). The width of the arch must be exactly the same width of the bottom rail. The sides of the arch rail must be parallel. And the most important thing, the centerline of the arch rail will be in line with the centerline of the bottom rail.

So how to cut the arch? Simply use the bottom rail to line up the arch (top) rail.

First cut the bottom rail to width and draw a centerline. Set it on a cutoff sled flush the edge (hopefully square to the blade) of the rail to the edge of the sled.

Transfer the centerline from the bottom rail to the cutoff sled.

Line the centerline of the top and bottom of arch rail with the line on the cutoff sled. Fill the angled gaps at the top with the cutoffs from the glue up.

Clamp and cut and admire the results.

Oooooooooh! Ahhhhhhhhh!

Tim-
I am an architect and a former teacher of design, this kind of geometry stuff comes with the territory and I have the scars to prove it. Glad you found the info useful. Oh, and I would quibble with the term arched segment… its actually a segmental arch (got to maintain the architect as a-hole mojo) lol

 

[jlsmith5963]

Pop the Copper

Here's my first attempt at the hot patina process. All but one of the chemicals arrived from ArtChemicals, the Cupric Nitrate being on back order. I decided I couldn't wait and pressed on anyway. I printed labels so I could keep better track of the chemical blends and colors each was supposed to produce. I learned two things right away. The first is this is a complicated process. The second is you really can't mess it up. I used the method demonstrated by David Marks on his Woodworks show WWK-607.

I started by sanding both sides of the panel with a random orbit sander and 220 grit. I then cleaned the panel with dishsoap and hot water and dried it.

My plan was to lay down a background blend of Traditional Japanese Brown and the orange/brown mixture of Ferric Nitrate/Ferric Chloride, then apply some layers of a Light Green and Traditional Blue patinas. The basic method is to heat the metal to about 220 degrees or the point where water steams when sprayed on, spray on the chemicals, then flame that area. This being a first effort I overheated some areas while underheating others. I also over-flamed some and under-flamed others. Some of the chemicals produce a different color than expected.

You may notice the picture above has a lot of blue and reds and some yellow spots. This was done by design and I was happy with this result. However, the vendor advised me to apply a coat of fine wax (Renaissance) which, unfortunatley, changed the color of the yellow and muted the others. I viewed a video on their website where the demonstrator advised not to wax green or blue patinas, rather to let it cool and apply Permalac laquer. I could not tell from the David Marks DIY page whether I should spray the final coat with water to stop the reaction. He had mentioned spraying off the panel between applications of chemicals, but I am still not clear about this.

In any event, the chemicals continued to react and the panel is much more green than these photos, although it still looks good. I will post more pictures in a later blog, but here are some to give you an idea of the result.

No test samples for you, eh? Looks good.