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well im planning on making a L shape desk with 2x2's and 3/4 ply of course im using my kreg jig and gluing all the joints.  my question is do you guys think it will be structurally strong enough. thanks in advance.

 

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Hi Jose,  Looking at your above diagram for a desk, If this is all you plan on using to build this It will not be structurally sound.  You will need to add some stretchers  between all the members on the bottom to counter act any sheer load placed on the top that will cause the structure to rack side to side as well as the front to back.  Also needed is something added to the front to support the upper portion of the 3/4 plywood such as vertical members running from the upper flat plywood and running to the floor.  A sheet of 3/4 ply will not be strong enough and will flex even if it is tied to another sheet running from another direction as you have showing in the drawing.  All vertical members  will need a stretcher running between them as in the above drawing you have nothing showing that will cause the vertical members to remain vertical.

what about this design?

Jose,  That is much better but it would be even better if you place the stretchers just above the floor level.  You will still be weak in the area where the two pieces of plywood come together in the front.  It will be weak across the entire front as the plywood will flex down ward.  You will need to add some substantial horizontal support under the plywood that is running across the front.   An example would be running a 2x2 horizontally from the end piece on the right all the way to the back vertical piece on the left, (this would be the 3rd piece from the left)    Then duplicate this on the left side of the desk, running a 2x2 horizontally across the front attaching it to the back vertical piece.  You will need to make a joint at the location where the other right side 2x2 intersects with the 2x2 on the left side.  A good joint here would be a lap style joint .Even with that the desk top is still going to be a weak area in the area running horizontal from the center point where the  two pieces of plywood meets each other. 

I have built similar style desks before and they are always weak at the front edge, where a chair would be used and a person's legs would go.  The strongest one I have built required a full sheet of 3/4 material  in the back standing  on its side and running full length to the rear corner and a second on running the full length across the back and joining the other rear sheet.  I also used a nice wide drawer system on each side to give the ends a solid and useful support.  For the top I used 1 1/2 thick high density particle board and then use laminate on it for a surface.  I attached the 90 degree corner by  using a 45 degree miter and draw bolts under the bottom to pull the miter closed.  At the front between the two drawer boxes I also used a 3 inch wide solid wood member standing on edge and using a lap joint.  I set it back about 2 inches from the front, glued it and used pocket holes to attach it to the top.  it was ran the full length and attached to the back vertical member like I described above.  Even with all this is still in one of which I try to avoid building if possible and is one of which I would not sit on.

I have built one since and this time in addition to what I described above I used 3/4 ply and cut 3 moon shape piece and allowed as much material that I could on the back coming out about one foot from the rear to sit on the floor and cut it so that it would  be about 2& 3/4 inches from the front and then ran the horizontal  pieces across as I described above.  Using the material on edge allows you to add a key board in the area where a person would sit.  Do this by using a second short piece behind where you cut away the key board access.  Just an idea for you to think about.

thank you for your input and guidance ill work on the final product and post some pics when its done 

Just a suggestion. Add what I call a flush mount to the under side where the two tops come together to strengthen the joint and keep the tops level with each other. You can use a small piece of wood or a small flat piece of steel.

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