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Screwin' in a boat?
https://www.smwebhead.com/phpBB3/viewtopic.php?f=22&t=3064		 Page 1 of 2
Author:  jntwlsn [ Tue Mar 24, 2009 4:55 pm ]
Post subject:  Screwin' in a boat?
I don't know how you do it, but everytime I do it, I got problems.


What is the best type of stainless steel screw to use when screwin' speakers in fiberglass on a boat, light, medium, or course thread screws? :lol:
Author:  M3eater [ Tue Mar 24, 2009 5:26 pm ]
Post subject:  Re: Screwin' in a boat?
What happens, you crack the gel coat?

If so, you need to drill a bigger pilot hole. Unlike wood or metal, you can't use a small pilot hole and force the crew in, it just cracks everything.

The actual thread pitch will depend on the thickness of the area you're screwing .... kinda like choosing saw blades. Thinner material will use a finer thread pitch ...... thicker, use a more course thread pitch.
Author:  Graham R [ Tue Mar 24, 2009 5:32 pm ]
Post subject:  Re: Screwin' in a boat?
If at all possible, it's better to use nuts, bolts and washers; putting screws into a composite material is a horrible thing to do in terms of engineering practice!

Graham
Author:  planealternative [ Tue Mar 24, 2009 5:44 pm ]
Post subject:  Re: Screwin' in a boat?
This is the method I use and it's always worked for me.
Start the pilot hole and all successive holes drilling in reverse until just through the gel coat, then switch to forward. When you get to the final hole size, use a larger bit and just break the edge of the hole, again drilling in reverse.
This cuts back the gel coat from the edge of the hole so the screw can't catch the edge and chip it.
Works for me.
Author:  millhaven_nice_guy [ Tue Mar 24, 2009 6:02 pm ]
Post subject:  Re: Screwin' in a boat?
You got my hopes up we were going to discuss something fun!!! :lol: :lol: :lol:

My wife lets me screw in the boat anytime I want as long as she's not around and it involves a drill :D

Some day we'll be alone, out on the high seas and i'll get her though :wink: :roll:
Author:  Blessed [ Tue Mar 24, 2009 6:30 pm ]
Post subject:  Re: Screwin' in a boat?
:shock: Hmmm, I go away for awhile and this is what I get back to find you guys talking about. I can't turn my back on you kids for a second . . .
Author:  aguyindallas [ Tue Mar 24, 2009 6:35 pm ]
Post subject:  Re: Screwin' in a boat?
Anytime you go straight for the screwing, there is gonna be some cracking.

Put a tab of electrical tape OVER the place you intend to screw. Drill a pilot hole of appropriate size through the tape. Remove the tape and screw away.

This typically helps cut down the cracking.
Author:  Lee [ Tue Mar 24, 2009 6:58 pm ]
Post subject:  Re: Screwin' in a boat?
I hate screwing in the boat I always end up with the hole bigger than I would like and then its a big mess.
Then I have to get out the gel kit and start patching.
Author:  M3eater [ Tue Mar 24, 2009 7:46 pm ]
Post subject:  Re: Screwin' in a boat?
Lee wrote:
I hate screwing in the boat I always end up with the hole bigger than I would like and then its a big mess.



:shock: ........ Ummmmm .........
Author:  St. Louis Dave [ Tue Mar 24, 2009 8:33 pm ]
Post subject:  Re: Screwin' in a boat?
See what screwin on the boat got me? :wink:

Image
Author:  wkearney99 [ Tue Mar 24, 2009 8:37 pm ]
Post subject:  Re: Screwin' in a boat?
aguyindallas wrote:
Put a tab of electrical tape OVER the place you intend to screw. Drill a pilot hole of appropriate size through the tape. Remove the tape and screw away. This typically helps cut down the cracking.


There are two reasons for pre-drilling. One is to, of course, avoid having the screw push enough material out of the way to cause movement and the resulting cracks. But the other reason is to help prevent spider cracks later on. You want to be very careful not to over-torque the fasteners (screws or bolts) into fiberglass. If you over-compress the fiberglass it will cause spider cracks to split outwards from the fastener. When you pre-drill the hole it helps to prep the hole almost as a countersink. If it's over-tightened this countersink sort of hole allows the material to push upwards toward the head of the fastener and not "as much" in an outward direction. But it's still important not to over-tighten.

I don't think I've seen many options for thread pitch when it comes to small screws in stainless steel. Most sized #8 and under look like a medium sort of thread.

-Bill Kearney
Author:  aguyindallas [ Tue Mar 24, 2009 9:08 pm ]
Post subject:  Re: Screwin' in a boat?
St. Louis Dave wrote:
See what screwin on the boat got me? :wink:

Image



You got 20.00 for screwing on your boat?
Author:  jntwlsn [ Tue Mar 24, 2009 9:51 pm ]
Post subject:  Re: Screwin' in a boat?
:twisted: ROTFL :D
Author:  Rhojo [ Wed Mar 25, 2009 6:29 am ]
Post subject:  Re: Screwin' in a boat?
St. Louis Dave wrote:
See what screwin on the boat got me? :wink:

Image


This is the effect Wifey and I are hoping for....the cash would just be a bonus though! :lol:
Author:  captwalt [ Wed Mar 25, 2009 8:15 am ]
Post subject:  Re: Screwin' in a boat?
jntwlsn wrote:
I don't know how you do it, but everytime I do it, I got problems.


There are plenty of pills out there to solve this. :D
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