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Would you like to add information to this article? Interested in writing or submitting an article? Have a question about this article? Vacuum Bag Versus Clamp Jig for Curved Moldings 
Question
Forum Responses
From contributor B: If I am reading your post correctly, I envision a number of plies 1/8" + thick at 2" tall bent around a radius of 18" for how big a portion of a circle. That can be done without a bag at all, by wrapping around the form and pulling in with a web clamp or a steel strap and clamp. We have done a ton of these laminations for casings, jambs and other stuff. Forms made out of MDF and screwed down to a sheet of anything. Can do bigger pieces with blocks laid out on a pattern line and pull the plies into and around the outside of the curve. The plies will bridge the space between the blocks and still give a fair and accurate form. From contributor H: That is right - if your laminations are 1/8" x 2", you are making this more complicated than it needs to be. Either a strap clamp or a form with holes every 4" just inside the curved edge for clamp heads is the way to go. As to the shower curtain, it is not pulling the laminations together. The atmospheric pressure is pushing on them. The material and how much it stretches has nothing to do with it. If you're pulling 22" and not getting tight seams, then the laminations are too thick for the radius (as stated above). From the original questioner: My shop help often accuses me of over-engineering... They were right on this one. We went to the strap clamp and all is well. Thanks for the help! By the way, any sources for bag material you like? Expect to be laminating 20 table tops next month. From contributor B: Vinyl from McMaster-Carr. 54" wide by any length. Have you reviewed the related Knowledge Base areas below? 
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