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Old 17-06-2014, 16:13   #16
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Re: Cast Acrylic source in Maryland

FWIW. online metals

Order Plastic Acrylic Sheet in Small Quantities at OnlineMetals.com
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Old 17-06-2014, 20:30   #17
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Re: Cast Acrylic source in Maryland

Delancy - the Prout has been sold, this is a Polynesia 40 cat...MUCH different than the Prout is almost all ways.
You are correct about the compound curve.
I am sure I could curve some PC but I think cast acrylic would crack bending it cold. Will check with a couple sign companies as you suggest.
The thicker main salon windows are flatter and should be OK to do flat.
thanks again,
Ed
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Old 17-06-2014, 21:10   #18
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Re: Cast Acrylic source in Maryland

Yes, to clarify you can't really cold-form acrylic unless the curve is very slight and didn't ever mean to suggest you should. It's just too brittle and will break. You really only want to use polycarbonate for this sort of thing.

If thermoforming, making the curve doesn't matter, both types will bend no problem so at the point its a material cost vs material performance issue.

For what it's worth, I have experience machining, thermoforming, line-bending, and glueing both acrylic and polycarbonate, as well as a bunch other plastics, with some additional experience specifically break-forming and rolling polycarbonate sheet.

At one point I was working on an architectural glazing application to basically make a sort of corrugated vacuum-insulated panel with less weight and greater depth than a typical one inch glazing panel using less material.

Unlike acrylic, poly is both more flexible and more pliable. In the case of cold-forming, at minimum bending radius per thickness it can be permanently deformed below without appreciable degradation of the optical qualities.

Generally, material thickness continuity and surface gloss determine visual appearance. When you exceed the material limit you will see sort of striated opacity along the bend axis, like if you form a cold ninety. The thing, is you see this same thing when you line bend anyway.

Besides being quicker, faster, cheeper where practical, cold-forming is best because it limits the risk to the material's surface and thickness. I have dealt with some guys who do medical stuff or display cases for the MOMA and the MET and even they will tell you perfect doesn't really exist, so anything you can do to minimize altering the material will be of benefit.

In your case, if you didn't feel comfortable just applying it to the cabin top with screws or if you wanted to go screw-less, talk to your sign guy about having him try to roll it for you.

Screw-less is worth looking into in my opinion ands might be worth some sort of forming operation. If you can get pretty close with your formed workpiece you should be able to get the rest of the way with the VHB and some propped up 2 x 4's, but at the end of the day screws are probably easier.

Just guessing at the width most shops should have the capacity to handle the width. They might baulk at the thickness you want to use if they haven't rolled poly before but remind them it's just plastic and not metal.

Like I said, best to play around a bit and make a mistake or two while you figure it out. As a general rule, the builder before you always took the easy way out when he built whatever you are trying to reproduce and so should you.
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Old 17-06-2014, 22:02   #19
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Re: Cast Acrylic source in Maryland

Check out Harbor Sales . com. They will custom cut but I don't think they bend, also free delivery. You have to buy full sheet but reasonable prices.
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Old 18-06-2014, 08:57   #20
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Re: Cast Acrylic source in Maryland

Harbor Sales is great. They have their own fleet of trucks and will deliver (usually the next day) even for relatively small quantities.

They operate out of Sudlersville on Maryland's Eastern Shore.
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Old 18-06-2014, 09:07   #21
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Re: Cast Acrylic source in Maryland

Check out Annapolis Plastics, Ananpolis MD. They just did a beautiful job reproducing my Islander 36's forward curved hatch. I'm sure he can help you. A very talented shop!
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Old 18-06-2014, 21:58   #22
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Re: Cast Acrylic source in Maryland

Thanks, I will check both Harbor Sales and Annapolis Plastics.
Ed
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Old 06-09-2014, 20:56   #23
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Re: Cast Acrylic source in Maryland

I went with Harbor Sales for the cast acrylic. No shipping cost as they brought it out to my house for free. One panel did show up with a small scratch in the paper and they said they will bring out another one fore me to swap out. I ordered three sheets two 1/4 " 4x8 and one 3/8" 4x8 and the total was $550. The 3/8" cost almost as much as the two other sheets together but it is for the larger front windows and I wanted a bit more strength there. Time to start cutting the windows out.

I plan to use Sikaflex 295UV when I install them so I am looking for a local source.


Kurt
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Old 07-09-2014, 19:47   #24
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Re: Cast Acrylic source in Maryland

This company is in Utah and not the East Coast, but I have been happy with my orders from them:

Delvies Plastics Inc. Plexiglass Sheet Store

Also of interest is all the various cements and solvents they carry, the place is a good resource if you are needing to mail order materials.
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