The only problem when we used countersunk 10-32 machine screws was it took us a little time to figure out that we had to drill the holes oversized by a couple of thousands; that's where the cracks came from. There is no need to really tighten the screws, I know that Schock simply glued in some of their windows with silicone, using a jig of some kind to hold them in place overnite. Cleaning up the &($^% silicone was the real job! Jerry jerrymontgomery.org ----- Original Message ----- From: "Clarence Andrews" <n9ca@comcast.net> To: <nl@sagatech.com>; "For and about Montgomery Sailboats" <montgomery_boats@mailman.xmission.com> Sent: Sunday, April 23, 2006 8:01 PM Subject: Re: M_Boats: Replacing M15 windows
If you want to use countersunk screws, you can use 100 degree aircraft c'sunk screws and use a stainless countersunk CSK) washer. It will give you the low profile of the CSK screw, and the washer will distribute the load so that the only force on the plexiglass is the clamping force. Both the CSK screws and washers are available from Aircraft Spruce and Specialty Company. 951-372-9555 (California) or 877-477-7823(Georgia) ----- Original Message ----- From: "Norm Lane" <nl@sagatech.com> To: "'For and about Montgomery Sailboats'" <montgomery_boats@mailman.xmission.com> Sent: Sunday, April 23, 2006 6:37 PM Subject: RE: M_Boats: Replacing M15 windows
Supposedly expansion & contraction is more likely to crack the window. I exaggerated when I said "everything I've read" but I did read it somewhere and it made sense to me.
Norm
-----Original Message----- From: montgomery_boats-bounces+nl=sagatech.com@mailman.xmission.com [mailto:montgomery_boats-bounces+nl=sagatech.com@mailman.xmiss ion.com] On Behalf Of David W. Wood Sent: Sunday, April 23, 2006 07:08 To: montgomery_boats@mailman.xmission.com Subject: M_Boats: Replacing M15 windows
The screw holes are countersunk but everything I've read says not to do that. What do you think?
First I've heard of that. Does anything you've read tell you why not to countersink them?
David
=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-= David W. Wood -=- dwood@dwoodworks.com 1981 M15 -=- Hull #163
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