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                           Zenith-List Digest Archive
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                     Total Messages Posted Wed 12/28/11: 1
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Today's Message Index:
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     1. 01:00 PM - Re: Cracked Canopy  (Bryan Martin)
 
 
 
________________________________  Message 1  _____________________________________


Time: 01:00:59 PM PST US
From: Bryan Martin <bryanmmartin@comcast.net>
Subject: Re: Zenith-List: Cracked Canopy


The canopy is made of acrylic (Plexiglas), It must be handled with extreme care,
it is very easy to crack. 

Polycarbonate (Lexan) is very forgiving. You can treat it like plywood as far as
cutting and drilling are concerned. It's almost impossible to crack.

Lexan is much more expensive than Plexiglas, which is one reason it's not used
in the canopy.


On Dec 27, 2011, at 1:37 PM, Peter Fox wrote:

> hello  builders 
> 
> take a really {40-100x} close look at any hole drilled in any lexan /poly sheet
and if one used a regular or even a ultra sharp bit  you should see a dozen
or so very tiny cracks that appear at the boundary area  {clear to opaque} i
believe to avoid this propagating in to a crack later
> you must 
> 1. drill in steps 
> 2 ream or melt to the proper size 
> 3 inspect  to see if the cracks are gone 
> 4 slightly break the edges 
> 5 make sure the fastener does not contact the sheet plastic on the inside of
the hole{ allow for the  thermal and vibration stress }


-- 
Bryan Martin
N61BM, CH 601 XL,
RAM Subaru, Stratus re-drive.
do not archive.


 

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