Intarsia Question

[rocknut]

I have checked out the section on making cabbed intarsias and understand gluing individual or two pieces onto one main piece. But my question to everyone out there is I want to glue small pieces together making a mosaic pattern; do I have to glue just two pieces together or can I glue several pieces together using plastic wrap as a temp. work surface?

Thanks
Rocknut

[Bluesssman]

I think the key here is glue setting time. I am guessing you will have all of the pieces cut and fitted to each other so it will be just a matter of adding the glue to the mix. I see no problem with gluing multiple piece together at the same time.

I am really looking forward to seeing your project!!


Gary

[theimage1]

The main problem with intarsia (from the gluing perspective) is that it is very hard to get a good fit when you try to get three pieces glued at once where they all overlap. Normally you glue two together and then re-lap the end of the joint(s) where the next piece must fit. It can be done the other way, but it takes a lot of time to cut, compare, and re-fit until all joints a correct. (If you over cut slightly then you have to throw out the short piece and start again.)

Look at the image below ...
In the first case (1) you have to cut both of the yellow side pieces to fit while maintaining the fit to the center piece. Now you can calculate the angles needed and take your time and lap them precisely. But I think you will find this is very time consuming.

In the second example (2) you only have to glue two straight lines with a little overlap. (You could also do the third side (3rd) at the same time (I just didn't illustrate it.) Once the glue is dried you simply use a trim saw to cut off the extra and then lap the sides  flat again. Now glue on the other three side with a little hang-over, let them dry and again trim and lap the outside. (6 sides only two gluing steps) NO weird angles to cut.

Turns out even sided stones 4, 6, 8, etc. (if large enough) can be glued, trimmed and re-lapped in only two steps. Odd sided stone must have one additional step. 3 sided (3 steps), 5 sided (3 steps), 7 sided (3 steps) etc. (see small gray diagrams inserted in larger one.) They show the order of gluing steps.

[theimage1]

The question about Geometric Patterns is a bit hard to answer as there are an infinite number of patterns possible. What I have diagramed below represents the steps for  "very few " possible patterns.
1) glue together a bunch of strips
2) cut across the glued strips (Straight or at an angle)
3) rotate every other strip and reglue or rotate and offset and reglue or rotate a different direction and reglue
or rotate a different direction and offset and reglue or etc. etc.
4) use the new pattern or once again cut at a angle and repeat step 3 and 4



As you can see from the image this can produce a number of patterns. Now if you create two different strip sets say the blue and yellow one shown and then a red and white one, now you can combine them to create 4 color mosaics, or add a third color pair strip etc. etc. etc.

[Taogem]

Nice demo!

[rocknroll]

...holy cow...that's awesome!!  ..i gotta try that.  thanks!!!!


-Jon

[Willy]

I love your explanation and diagrams on Intersia.  Had heard of it and have seen some interesting work and always wondered how done.

I must pass on however a very disappointing situation with Intarsia recently.  Saw a couple beautiful Rhyolite pendants that were advertised as Intarsia Pendants.  Was trying to figure out what was used to make the highlight and was told by another person that the maker probably used Onyx.  For the price and free shipping I was more than willing to try one, so ordered one, and to my total amazement when arrived, all that had been done was a small round line (probably from a dremel tool) was made around the edge of the stone about 1/4 in inch from all edges, and then a black magic marker (not even a perminent type) was used to fill the indent to look like a black colored stone had been inserted.  All I can say is with some extra polishing thank heavens I hope to end up with a decent Rhyolite Fan Pendant.  Not worth the cost or effort to return, but they did get bit of a harsh e-mail.

As said, sure glad to see how the real Intarsia is done.  Thanks much.

Willy

[rocknut]

Another awesome Thank you to 'theimage1' for such detail and in depth presentation. Not only inspired me but it seems other too.

Again, Thank You

Jim