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Great Planes Building Board Modification

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Old 01-06-2003, 04:44 PM
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rajul
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Default Great Planes Building Board Modification

Hiya Folks! To those who own a GP board, you might be interested in how I modified it to be virtually warp free in any weather condition. I have frequently checked with a straight edge for warpage in logitudinal, transverse and diagonal directions with no warpage at all ! I have attached a couple of pics which I hope are clear and self-explanatory. Basically I fastened 1" hollow aluminum square bars to the bottom all along the edges and an additonal piece across the width in the middle. I just used three self tapping wood screws for each bar and added rubber inserts at the ends of the bar which prevents gouging of your work table by the corners of the bars. Hope this helps........
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Old 01-06-2003, 04:50 PM
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Default Great Planes Building Board Modification

close up of the corner
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Old 01-06-2003, 08:37 PM
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daywalker
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Default Great Planes Building Board Modification

I already have a G.P. buiding board that is warped, any idea how to straighten it before I try your idea?
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Old 01-06-2003, 11:05 PM
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Default Great Planes Building Board Modification

I just picked up one of those....thanks for the suggestion for 'improvement'!

Jerry
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Old 01-06-2003, 11:15 PM
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rajul
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Default Great Planes Building Board Modification

Daywalker, when you fasten the board to the aluminum frame, the warp should be gone. Use self-tapping screws 3/4 the board thickness. Drill thru the aluminum bar, enlarge the bottom hole so that a flat head screw (with washer preferably) can be fitted thru with a magnetic screwdriver. I used three screws per bar, but you could increase it to four.............
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Old 01-07-2003, 01:00 AM
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Default Great Planes Building Board Modification

Rajul- Thanks for the tip- I'm going to try it out!
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Old 01-07-2003, 05:47 AM
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Default Great Planes Building Board Modification

When I took my newly purchased GP board out of the wrap it was perfectly flat. After about 4 hours it started cupping. I kept flipping it over, after a few hours it was cupped in the other direction. So I put 1/4" stickers under it for a few days. After 1 week it stayed flat, but I do like your idea rajul. I was looking for aluminum channel, I wanted to frame all around, but couldn't find any the right size.
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Old 01-07-2003, 05:56 AM
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Default Great Planes Building Board Modification

It's next to impossible to get the moisture distribution uniform throughout the board to minimise warpage. You've got to "pin" the board down somehow. I get my aluminum supplies from a window frame maker.........
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Old 01-07-2003, 06:29 AM
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LarryC
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Default Great Planes Building Board Modification

rajul,

What kind of wook is the GP board made from?

I have a board here that I made from some shelf board that is made from a lot of pieces glued together, it looks a lot like your picture. It is made of pine. I glued a cork surface to one side for pinning things down. But, it warps with the weather. You just have to catch at the right time if you want it flat.

If the GP board is similar, I might do as well to add the bracing to mine rather than buying another board.

Larry
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Old 01-07-2003, 07:33 AM
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Default Great Planes Building Board Modification

Larry, the GP board is made from multiple-section finger jointed balsa. The fine grain balsa accepts pins very easily. I still use a pin pusher though. The one I have is 48"x16"x3/4" and is the largest size.
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Old 02-06-2003, 07:12 PM
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Default Great Planes Building Board Modification

I have been using a piece of 3/4 pine plywood (A/C grade) 2'*4' and have had much success. I have no trouble pushing pins into it (you can always use a pin pusher). Home depot sells them already cut to this size. Since I am no longer allowed to use the kitchen table. I have built a small work room in my basement. I will be making a work table using a piece of 3/4 inch birch ply with a sub frame of two rails (front and back) made from two pieces of 3/4 ply laminated together(this will be a very rigid header). The pieces will be ten inches in width and cut on a table saw so they will be true. I will then put the same size (10" rips of ply) between the rails every sixteen inches. Sort of like the framing of the floor in a house. Since all the pieces will be the same width and cut on a table saw, as long as you are accurate when you assemble you will have a very flat frame to lay the table top on. If you feel that it will be too hard to push pins into the ply you can always lay ceiling tiles or other softer material on top. I tried the birch and to my surprise I was able to push pins into it. The only thing left to do is to support it with some legs. My table will be 4'*8' and the back will be supported by attaching the back rail to the wall and the front rail will have legs.

James
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Old 02-06-2003, 10:57 PM
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Default Great Planes Building Board Modification

The instructions that come with the board state that once the moisture level is uniform in the board it will be flat. Mine warped shortly after unwrapping and I was a little bummed. After sitting in my garage for three weeks the boards (I bought 2) were flat again. I live in Southern California. I don't know what would happen where humidity fluctuates greatly. Rajul's idea was a good one. I've used it on the table my building boards sit on. I use a pane of glass and a strait-edge to check for "flatness".
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Old 02-08-2003, 03:33 AM
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Default Great Planes Building Board Modification

Hi Rajul,

I just got one building board today, 48"X16"X3/4" . It looks flat and straight. However, your ideas is acceptable for a long run. Thanks.
I don't like Home Depot, but I don't have no choice to go to get aluminum square tubes.

TST
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Old 02-08-2003, 05:09 AM
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Default Great Planes Building Board Modification

Hi TST, it's not a choice, it's a good decision ! You know, you could always turn the balsa board over when it has been damaged or worn out after some time, and re-install the aluminum bars. You have two sides of the board to use !
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Old 02-08-2003, 02:47 PM
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Default Great Planes Building Board Modification

...you could always turn the balsa board over when it has been damaged or worn out after some time, and re-install the aluminum bars.
Or you may be able to take it to a cabinet maker and have it planed flat and smooth again. I once worked for a custom kitchen company that had sanders and planers the width of a large cabinet door.
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Old 02-10-2004, 06:16 PM
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Default RE: Great Planes Building Board Modification

I purchased 2 sheets of 2'X4'X3/4" particleboard from Lowe's for $5.25 each. I've glued them back to back and additionally, fastened them together with stainless steel wood screws from one side to ensure that they won't move. Because there is no contiguous grain in the sheets, they will not warp. If I have a problem sticking T-pins into the board, I may buy 1/8" or 1/4" sheet cork, and apply it to one side. This should create an solid, non-warping building board.
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Old 02-10-2004, 06:21 PM
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Default RE: Great Planes Building Board Modification

Moisture does a lot of funny things over time
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Old 02-10-2004, 06:26 PM
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Default RE: Great Planes Building Board Modification

Have you heard of any issues using particleboard?

Thx... LJF...
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Old 02-10-2004, 11:27 PM
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Default RE: Great Planes Building Board Modification

Yeah, don't lean on it with your elbows...it leaves dents!

Jerry
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Old 02-11-2004, 12:28 AM
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Default RE: Great Planes Building Board Modification

[&:]

Dear to all,

Over than 20 years, I built my airplanes in the kitchen, in my office, on my back yard... where ever I feel comfortable to glue the balsa sticks together... for good, but disregard wher I am, the building board must be level, flat, not for today but for many years come.
All of us , we feel good and satisfy if after all , the model we built is straight, the wing, the fin, the stabilizer..all got flat surface, and of course it will fly better. Then you don't mind to install a good control system in it....and model will last for a long time.
We had many experiences the bad and the good, please so don't squeeze a little money to buy a good building board, it just doesn't make senses.
Of course, we need to go for bugget for this hobby but not for building board.
You don't need to have 9 or 10 chanels radio with CPM to fly a model just need four chanels, with reasonable JR 8103 you can set up for up to 10 airplanes or helicopter with all kind of mixing. Saving money one thing to purchase another thing better.

Just some of 2 cents ideas.

T.Tiep
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