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| Woodworking (rec.woodworking) Discussion forum covering all aspects of working with wood. All levels of expertise are encouraged to particiapte. |
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MDF table top
"Fred McClellan" wrote in message ... Hi all . . . I need to build a new model airplane building table; my old hollow-core door lash-up finally sagged after a year's use. The table needs to be dead flat. The way I build the model airplanes is to top the table with a sheet of 1/2" foam building insulation, lay the plans on the foam, cover the plans with waxed paper, and build the various parts of the model directly over the plans. The foam insulation sheet is so I use T-pins to hold the wood parts in place during frame-up. No need for drawers or storage; the table is strictly for building the airframe. There will never be any weight to speak of on the building bench, other than the airframe, hand tools, bottle of Titebond, etc. Nothing heavy at all; the model I'm working on now will weigh about 30 pounds ready-to-fly. Finished models won't ever be placed on the building table, only the major sub-assemblies like the right wing, left wing, fuselage, or tail feathers. I need the work surface to be 30" wide x 6' long to handle any model I'll likely build in the near future. The table has to come apart from time to time so I can regain floor space for doing things like rigging the paint tent, checking the CG on a completed model, etc. Which in turn means the building bench can't be built like one would build a regular wood working bench, I gotts to break it down and stash it in the corner from time to time. The question is, using 1/2" MDF for the work surface, how much support will be needed to insure it doesn't droop over time ? I thought a pair of 2x6s length wise, 10" in from the front and rear edge, a 2x4 frame with 2x4 legs, and I'm done. Sound ok, or did I miss something ? I know a sheet of 3/4" MDF would be better and that laminating two 3/4" MDF sheets would be best, but that sort of weight impacts the bit about having to take it apart now and then; without a chain fall, that is. g Cheers, Fred McClellan the dash plumber at mindspring dot com |
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