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Interesting old string. I was watching some older season programs of the Woodsmith Shop last night and they made a great little shop made dovetail jig, very much like the Katie or Incra jigs that sit on top of the table. I prefer this to the old Porter Cable style which must be used regularly to remember how to set it up and adjust out all the small errors.

I have a Rockler dovetail jig with dust collector which are still in the boxes. It's the PC type jig and I'm thinking of selling it. Box contents: and details https://www.rockler.com/rockler-s-complete-dovetail-jig-with-dovetail-jig-dust-collector-combo-offer. Thinking $90 plus shipping. PM me if you're interested. Cleaning out the never used stuff.
 

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First, is this the jig you're talking about? If it is and it's warped, return it. Dovetails are very precise and a warp will make them impossible and ruin a lot of espensive wood. In general, it's very helpful to mark the inside of the parts of the box, and mark the corners that fit together, Aa, Bb, Cc, Dd. That will make it easier to determine which gets what cut. The A would be pins, the lower case the tails. Organizing that way will make it much clearer. I found this jig at Home Depot, so returning it should be easy. Here's the pix.
Font Rectangle Parallel Engineering Diagram
 

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I have the Sommerfeld jig. It is also meant to be used on a table, and it is far more predictable than the more common PorterCable unit. I once watched someone use the PC in a demo. She was an experienced woodworker and she simply could not cut a dovetail joint that fit. Tried for more than an hour with prepped wood.

The thing about the General jig is that it's pretty short, so you're limited on the depth of box you can make. I for one will enjoy seeing how your project comes out. The bigger jigs, like the Sommerfeld Katy Jig, and the very similar Leigh, which is available in a longer version so you can make bigger boxes and deep drawers. But those jigs are definitely more expensive. This is just for your information.

I did find a favorable review of the General jig: 5 Best Dovetail jig of 2021 - Top-Rated Reviews & Deals It fared pretty well. But it didn't address the other type of jig. I like being able to move the wood over a fixed router rather than the other way around.

I really don't much like the look of boxes with dovetails showing. I prefer box joints, which are just as strong and with the iBox jig are simple to make and fit on a table saw with a dado set. Personal preference, far less fussy about setup. Here are some pictures of the Leigh dovetail jig and the iBox jig.

Leigh Dovetail jig on router table
Engineering Machine Composite material Metal Rectangle


Incra iBox jig Adjusts to the thickness of the dado stack. Very simple setup.
Musical instrument Wood Table Hardwood Flooring
 

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I use the Sommerfeld Katy Jig, and I like it. The Leigh jig is very similar. I do know the Sommerfeld jig has the ability to set odd spacing for the joints by replacing the fixed fingers with individual ones. I think both Sommerfeld and Leigh jigs are much more logical to use than the Porter Cable type. I had and was happy to be rid of the Rockler dovetail jig, which is the same as the PC. I know a lot of people like the Leigh but I can only speak to the Katy jig.

A key thing is to mark the inside of each piece, and lay them out and label the ends that fit together. Use a capital letter for the tails, lower case for the pins. So the four corners are marked Aa, Bb, Cc, Dd. Fairly easy to work it out from there, and there are lots of videos of each in use. I keep the Sommerfeld video on hand so I can review it because I don't us it very often.

Here's a video on using the Leigh jig, quite similar.
Rectangle Wood Toy Technology Font
 
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