Andrew, great question.
Once you start to get into larger pieces the issue of warping wood grows tremendously. The joint itself is easily strong enough to support such a span, the weak point is the wood itself. Using workpieces no wider than 6" will provide a lot more strength for the project. Look at it as a bookshelf, if you have a very long shelf but only include one support on either side, it will begin to sag in the middle once weight is applied. Using smaller pieces is like adding more support brackets or vertical edgebanding along the shelf.
Also keep in mind and remember to alternate your wood grains so that small piece warping does not add up over the span of the table top! For more information, see this video.
Good luck, and thanks for posting your question. Make sure to post some photos of your project when you're done, we'd love to see them!
I forgot to mention that I just completed a panel top for my DRT Project. I used six 1"x6"x6' Red Oak panels. I followed the instructions shown on the Kreg DVD that came with my kit. No glue, just some drillin' and some screwin'!
DRT Project - The Beginning
I marked the boards 1 to 6 horizontally, then started with boards 1 & 2. I used 3/4" H style pipe clamps to the keep the panels aligned. Progressively I added one board at a time until all 6 were joined.
I followed the Kreg DVD with regards to panel attachment. The pocket holes are approximately 6" apart starting at 2" from an end. After completion the top has been moved several times with no signs of bending, twisting, or flexing.
Andrew Pensavalle said:JD,
I notice that you did not actually attach a board from both sides. In other words, one board is screwed into another and that board is not screwed into the next piece but the next piece is screwed into it. I don't know if that makes sense. This will be my first project using the Kreg Jig to make panels. I would think that you would alternate screws so that each board is screwed into the board next to it and visaversa. Another question. Should you start from one side of a panel and work to the other side or start in the middle and work outward.
I can't believe all the questions one comes up with when they start a project that seemed so simple at first.
JD said:I forgot to mention that I just completed a panel top for my DRT Project. I used six 1"x6"x6' Red Oak panels. I followed the instructions shown on the Kreg DVD that came with my kit. No glue, just some drillin' and some screwin'!
DRT Project - The Beginning
Kreg has the edge joining video on You Tube. This is the video I used when making my table top.
Kreg Edge Joining Video
Andrew Pensavalle said:Thanks so much for all this information. This is the first discussion group I have ever joined that has been so respnsive and I really appreciate it. Although it might take a little more preplanning, I think what I am going to try is alternate the holes at each edge. In other words, at six inch intervales one hole will be coming into the board and the next one will be the pocket hole part and so on. I wish I could get a hold of that DVD. I purchased my K2 a long time ago before DVD's. If this project works out, I am going to retire my tenon jig and dowel guide.
I thought I would send out a picture of the completed Blanket Chest that I worked on and received so much information from both readers of this forum and from the Kreg reps. Thanks to you all the project came together pretty well. Except for attaching the bottom with standard through the wood screws and glue, the entire project is done with Kreg Pocket Hole joinery. I'm just waiting to apply a finish as soon as my daughter decides what she wants. This Volador lumber finishes up really nice with just a clear poly wipe on finish. One thing I have to say about using this lumber.......it is HEAVY!!!