Darryl Keil Last Activity 2025-09-09 11:09 AM
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Wine Country

Posts: 1

Joined: 2006-09-24
Location: Santa Rosa, CA

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Subject : Material for bending tight radiuses
Posted : 2006-09-24 12:28 PM
Post #33394

We use vacuum lamination extensively in the shop. Many of the parts have curved sections with bending radiuses of 2" or so. Some of the bends approach 180 degrees. I have not found off the shelf material that will bend this radius without snapping. Consequently, we kerf .375 bending luan or sand off one of the outside layers of 1/8" bending Italian poplar or sand the solid side of prekerfed 6mm MDF down to about .030" thick and wet the back. Does anyone have a source for material that will vacuum form over a 2" radius? 4x8 or 4x10 sheets are most desirable. BTW, The final part thickness is 1/2" to 3/4" and are 36-48" wide along the bend axis. The bags are 30 mil poly. Many thanks!




 
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Darryl Keil

Posts: 1455

Joined: 2003-05-22
Location: Maine

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Subject : RE: Material for bending tight radiuses
Posted : 2006-09-24 9:26 PM
Post #33397 - In reply to #33394

Wine,

I have not used it but have seen a 1/16 three ply that would do the job. A lot of layers of course. I think it was called some kind of aircraft plywood. The other possibility is 1/8" bending birch. Because it only 2 ply, not 3 ply's like the Italian poplar is has a tighter bending radius

Sorry I cant give you more specifics on the 1/16" material.

Sincerely
Darryl Keil


 
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the yacht shop

Posts: 7

Joined: 2006-10-31
Location: MA.

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Subject : RE: Material for bending tight radiuses
Posted : 2006-10-31 7:50 PM
Post #33435 - In reply to #33394

we had a project that we needed very tight bends on and found that if we used epoxy between all the layers then fastened one end so panels could not move and then drew a vacuum on the bag we were able to bend and clamp everything to the mould all at once. the part was 5 layers of quarter inch ply bent into a 24" radius. Very tight indeed. this may work on a thin application like yours.


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