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
When tightening a c'sunk bolt in (comparatively much weaker) plastic, the taper on the head acts like a wedge in the hole and can split out the plastic (a radial crack from the hole to the edge) if over-tightened. You can certainly use c'sunk bolts; just don't over tighten them. I think they are much cleaner looking than raised heads. Tod M17 #408 BuscaBrisas -----Original Message----- From: montgomery_boats-bounces+htmills=bright.net@mailman.xmission.com [mailto:montgomery_boats-bounces+htmills=bright.net@mailman.xmission.com ] On Behalf Of David W. Wood Sent: Sunday, April 23, 2006 9:08 AM 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 _______________________________________________ http://mailman.xmission.com/cgi-bin/mailman/listinfo/montgomery_boats
Try using cup washers.....with a drop of silicone behind them. Looks good and shouldn't damage your glass. BTW...I'd be using tinted Lexan. Howard On Apr 23, 2006, at 10:35 AM, <htmills@bright.net> wrote:
When tightening a c'sunk bolt in (comparatively much weaker) plastic, the taper on the head acts like a wedge in the hole and can split out the plastic (a radial crack from the hole to the edge) if over-tightened.
You can certainly use c'sunk bolts; just don't over tighten them. I think they are much cleaner looking than raised heads.
Tod M17 #408 BuscaBrisas
-----Original Message----- From: montgomery_boats-bounces+htmills=bright.net@mailman.xmission.com [mailto:montgomery_boats- bounces+htmills=bright.net@mailman.xmission.com ] On Behalf Of David W. Wood Sent: Sunday, April 23, 2006 9:08 AM 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
_______________________________________________ http://mailman.xmission.com/cgi-bin/mailman/listinfo/montgomery_boats
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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
_______________________________________________ http://mailman.xmission.com/cgi-bin/mailman/listinfo/montgomery_boats
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
_______________________________________________ http://mailman.xmission.com/cgi-bin/mailman/listinfo/montgomery_boats
_______________________________________________ http://mailman.xmission.com/cgi-bin/mailman/listinfo/montgomery_boats
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
_______________________________________________ http://mailman.xmission.com/cgi-bin/mailman/listinfo/montgomery_boats
_______________________________________________ http://mailman.xmission.com/cgi-bin/mailman/listinfo/montgomery_boats
_______________________________________________ http://mailman.xmission.com/cgi-bin/mailman/listinfo/montgomery_boats
Countersinking is the preferred way to keep the fiberglass from spidering per DIY boating. gilbert -----Original Message----- From: montgomery_boats-bounces+gilbert=mindgame.com@mailman.xmission.com [mailto:montgomery_boats-bounces+gilbert=mindgame.com@mailman.xmission.com] On Behalf Of Norm Lane Sent: Sunday, April 23, 2006 5:37 PM To: 'For and about Montgomery Sailboats' 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
_______________________________________________ http://mailman.xmission.com/cgi-bin/mailman/listinfo/montgomery_boats
_______________________________________________ http://mailman.xmission.com/cgi-bin/mailman/listinfo/montgomery_boats
participants (7)
-
Clarence Andrews -
David W. Wood -
Gilbert Landin -
Howard Audsley -
htmills＠bright.net -
jerry -
Norm Lane