I really should have followed up on this, but better late than never. I did put the jig together, and it performed very well. I had to mount a large portfolio, as well as a series of prints for exhibition with a 3/8" border between the print and the window mat. I feel I was able to be accurate to 1/32" which was fine with me.
I'll post a series of photos, and then information on parts if anyone is interested.
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As you can see, the base I used was an
Ikea Perfekt Gnosjo part # 002.204.60 - it sort of fell into my lap, but believe it is for a cabinet or something. It is wood, square, and accommodates a 20x24 mount which was my goal. I screwed in rubber feet into the bottom, which I got from Lee Valley tools.
The T-Square is an
Alvin C36 which has the transparent edge. I attached some felt to the bottom of the T-Square, which was Doremus Scudder's suggestion I believe. I think I used double sided tape?
There are two 24" zero centered rulers, which were purchased from GEI in Syracuse. Product #
1033A-24. They are accurate to a 1/32" and are just brilliant. As you can see, one is attached to the T-Square, and the other runs along the bottom of the baseboard. The two had to be positioned very precisely, which took some fiddling. The bottom ruler is screwed in, but that was a bad idea - the ruler "flexes" with the torque of the screws. I probably should have put in washers or something.
The ruler running up on the left side is a regular
cabinet maker's ruler, which I bought from Lee Valley Tools. It starts at 0, which I like. You can see in the second picture that the zeroes on the two rulers have to be aligned exactly. More fiddling there, but not too difficult.
Using the jig requires a system, but once you get the hang of it, you can move fast and efficiently.
One of the goals was the be able to mount an image, and put a window mat around with a 3/8" reveal of the paper base. In this case, the window mat is 16x20 and the photo is dry mounted to a 16x20 piece of board - the two have to align perfectly. Realistically, there is very little room for error. It was a good test of the jig. Here's a photo of one of the framed pieces:
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If you do a lot of dry mounting, perhaps this is something to consider. I'm sure it can be improved upon, but all in all it has saved me a lot of time and given me results I am happy with.