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  #31  
Old 01-14-2016, 07:29 AM
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Rick_A Rick_A is offline
 
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Quote:
Originally Posted by magiccarpet View Post
I don't quite understand why this would reduce the crazing hazard. I always thought that it is only a matter of the particular Lexan material which does not like to get in touch with mogas/avgas fuel. Does it mean that the Lexan top surface is resistant, but not the machined front side, edges, cuts and holes?

I am asking, because I am debating whether I should order the new Plexi window or stick with the one I received in my kit. I will soon have reached that step to install that window and I better do it only once, but then I do it right.
$390 plus shipping to Europe is then another question.

Thank you for enlightening me on that.
The crazing is NOT related fuel. I have seen crazing on the front edge of the lexan mid-way between holes. I have also seen crazing/cracks emanating close to screw holes that I know with 100% certainty were never exposed to fuel.

The flat lexan is under a lot of stress. I believe the cracks and crazing are stress induced. If I had the option of the plexiglass window when I built my -12, I would have paid the extra money.
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  #32  
Old 01-14-2016, 08:51 AM
olderthandirt olderthandirt is offline
 
Join Date: Aug 2015
Location: Lopez Island, Wa.
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Default Acrylic plastic drilling

I asked Van's if they sold #27 Plexi/Acrylic drill as called out in plans, answer was no, just go to venders..which I did and no one sells a number 27 plastic/acrylic drill...why would they call out use of something no one sells??
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  #33  
Old 01-14-2016, 03:13 PM
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rvbuilder2002 rvbuilder2002 is offline
 
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Location: Hubbard Oregon
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Quote:
Originally Posted by Rick_A View Post
The crazing is NOT related fuel. I have seen crazing on the front edge of the lexan mid-way between holes. I have also seen crazing/cracks emanating close to screw holes that I know with 100% certainty were never exposed to fuel.
A more correct statement would be The crazing is not only fuel related .

Heavy fuel exposure can most certainly cause instantaneous crazing as a number of RV-12 owners have experienced. If not, the release of plans revision recommending a very specific process to seal teh window, would not have happened.
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  #34  
Old 01-14-2016, 03:17 PM
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rvbuilder2002 rvbuilder2002 is offline
 
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Quote:
Originally Posted by olderthandirt View Post
I asked Van's if they sold #27 Plexi/Acrylic drill as called out in plans, answer was no, just go to venders..which I did and no one sells a number 27 plastic/acrylic drill...why would they call out use of something no one sells??
One option is to just Make your own

There is lots of other helpful info by doing a web search on Plexi drill bits and drilling plexi
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Opinions, information and comments are my own unless stated otherwise. They do not necessarily represent the direction/opinions of my employer.

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RV-6A (aka "Junkyard Special ")
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  #35  
Old 01-14-2016, 03:46 PM
rv9builder rv9builder is offline
 
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Location: Irvine, CA
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Spruce sells a 5/32 plexi bit.

http://www.aircraftspruce.com/catalo...clickkey=71539

5/32 = .1563
#27 = .1440

The difference is .0123. Would that be close enough to work?
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  #36  
Old 01-14-2016, 04:37 PM
Lee Jordan Lee Jordan is offline
 
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I got mine from McMaster-Carr. #27 bit for plexi

http://www.mcmaster.com/#27465a339/=10omkd4

-Lee
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  #37  
Old 01-14-2016, 05:03 PM
Driftdown Driftdown is offline
 
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Thanks Lee.
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  #38  
Old 01-15-2016, 03:40 AM
rjtjrt rjtjrt is offline
 
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Handclutch
Jack PM sent.
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