SailNet Community - Reply to Topic

   Search Sailnet:

 forums  store  


Quick Menu
Forums           
Articles          
Galleries        
Boat Reviews  
Classifieds     
Search SailNet 
Boat Search (new)

Shop the
SailNet Store
Anchor Locker
Boatbuilding & Repair
Charts
Clothing
Electrical
Electronics
Engine
Hatches and Portlights
Interior And Galley
Maintenance
Marine Electronics
Navigation
Other Items
Plumbing and Pumps
Rigging
Safety
Sailing Hardware
Trailer & Watersports
Clearance Items

Advertise Here






Go Back   SailNet Community > On Board > Gear & Maintenance > 1st big project, bronze thru-hull
 Not a Member? 


Thread: 1st big project, bronze thru-hull Reply to Thread
Title:
  

By choosing to post the reply below you agree to the rules you agreed to when joining Sailnet.
Click Here to view those rules.

Message:
Trackback:
Send Trackbacks to (Separate multiple URLs with spaces) :
Post Icons
You may choose an icon for your message from the following list:
 

Register Now

In order to be able to post messages on the SailNet Community forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.
Please note: After entering 3 characters a list of Usernames already in use will appear and the list will disappear once a valid Username is entered.
User Name:
Password
Please enter a password for your user account. Note that passwords are case-sensitive.
Password:
Confirm Password:
Email Address
Please enter a valid email address for yourself.
Email Address:

Log-in

Human Verification

In order to verify that you are a human and not a spam bot, please enter the answer into the following box below based on the instructions contained in the graphic.



Click here to view the posting rules you are bound to when clicking the
'Submit Reply' button below


Additional Options
Miscellaneous Options

Click here to view the posting rules you are bound to when clicking the
'Submit Reply' button below


Topic Review (Newest First)
05-14-2014 09:04 PM
Minnesail
Re: 1st big project, bronze thru-hull

Quote:
Originally Posted by WoobaGooba View Post
Bi-metal hole saw. Dig out the drill press. G10 is tough stuff. I used a pulsing technique on drill press to fab several backing plates from 1/2" G10.
I guess that's what I'll do. $40 for a 6" bi-metal hole saw at Home Depot. I'll just have to think of something else to use it for to justify the expense. Oversize checkers set?

I'm really not looking forward to tunneling my way back to the drill press... A winter's worth of procrastination is stacked up in front of it.
05-14-2014 08:58 PM
WoobaGooba
Re: 1st big project, bronze thru-hull

Quote:
Originally Posted by Minnesail View Post
Yeah, I have a little sheet of G10 that I'm going to use for the backing plate. That stuff seems crazy durable!

So the jigsaw works for round cuts? I was thinking about that, but I'm afraid I wouldn't be able to cut a very neat circle.

The other option is a hole saw, but that means picking up a moderately expensive hole saw that I'd likely only use once or twice.

(It would also mean clearing away the rubble from the corner of my garage so I could get to my drill press, but that's another issue…)
Bi-metal hole saw. Dig out the drill press. G10 is tough stuff. I used a pulsing technique on drill press to fab several backing plates from 1/2" G10.
05-14-2014 02:22 PM
gbgreen59
Re: 1st big project, bronze thru-hull

I do a rough cut with the sabre saw...outside the line. Then finish shaping by sanding with the tools mentioned above.

I've used the method you mentioned too and work just fine. The really big cutters get pretty expensive, but not that bad. Makes it an easier, less messy job too.
05-14-2014 01:27 PM
Minnesail
Re: 1st big project, bronze thru-hull

Quote:
Originally Posted by gbgreen59 View Post
I have used G10 for a number of different things. It is really a hard material. I use a saber saw with fine teeth to rough cut rounded shapes. Then do final shaping using either a sanding disc on the table saw or sanding attachment on the angle grinder.
Yeah, I have a little sheet of G10 that I'm going to use for the backing plate. That stuff seems crazy durable!

So the jigsaw works for round cuts? I was thinking about that, but I'm afraid I wouldn't be able to cut a very neat circle.

The other option is a hole saw, but that means picking up a moderately expensive hole saw that I'd likely only use once or twice.

(It would also mean clearing away the rubble from the corner of my garage so I could get to my drill press, but that's another issue…)
05-14-2014 09:54 AM
gbgreen59
Re: 1st big project, bronze thru-hull

Quote:
Originally Posted by Multihullgirl View Post
There is a fiberglass product I know as 'strong-back' which I believe is 'structural fiberglass' at McMaster-Carr (mcmaster.com) you can get that and fabricate a backing plate for yourself. You may be able to buy something like you want at McMaster, whether or not fiberglass
Are you talking about G10 (Garolite)? I used that for my thru-hulls; also, got it from McMaster-Carr. Used West Systems 404 mixed into epoxy for the adhesive to the hull. I think that is what people used on other threads on this topic.

Maybe this will be useful: I have used G10 for a number of different things. It is really a hard material. I use a saber saw with fine teeth to rough cut rounded shapes. Then do final shaping using either a sanding disc on the table saw or sanding attachment on the angle grinder. This makes a lot of dust. The dust will coat everything in the shop. I do it outside if using the angle grinder. I rigged up a vacuum attachment for the table saw.

When cutting G-10 on the table saw, I buy cheap plywood blades (fine spaced teeth). They don't last too long. But normally, there are not very many cuts to make.
05-14-2014 09:05 AM
Multihullgirl
Re: 1st big project, bronze thru-hull

Quote:
Originally Posted by Minnesail View Post
I couldn't find any place that sells them. I thought I could save a step and save having to buy a big hole saw if I could buy a pre-shaped backing plate, but although they're in the catalog I couldn't find any website selling them.

There is a fiberglass product I know as 'strong-back' which I believe is 'structural fiberglass' at McMaster-Carr (mcmaster.com) you can get that and fabricate a backing plate for yourself. You may be able to buy something like you want at McMaster, whether or not fiberglass
05-12-2014 11:54 PM
pdqaltair
Re: 1st big project, bronze thru-hull

Lots of good advice. The most important issue to me is that...

Every through hull eventually becomes a step or hand hold. If you can grab it and break it, there is too much leverage or there needs to be better support.
05-12-2014 07:42 PM
casey1999
Re: 1st big project, bronze thru-hull

Quote:
Originally Posted by Minnesail View Post
I couldn't find any place that sells them. I thought I could save a step and save having to buy a big hole saw if I could buy a pre-shaped backing plate, but although they're in the catalog I couldn't find any website selling them.
Yes I was hoping the same thing. If you want them, just go to the Groco website and look up Groco distributors, they can special order them for you. In any case, they do not look like they would work. In fact, I am really not sure how they can be used. It looks like Groco would expect the installer to use the thru hull itself as the sole method of connecting the seacock to the hull. This backing plate would just distribute to loads on the hull. This would be no different than sticking a piece of plywood under the seacock (or adapter fitting). With the thread inserts, it looks as if Groco is not expecting the installer to through bolt the seacock/adapter plate.
05-12-2014 06:59 PM
Minnesail
Re: 1st big project, bronze thru-hull

Quote:
Originally Posted by casey1999 View Post
A few months back I called Groco and asked what material their backing plate was made of. The tech support did not know exactly, but said the material is like a man made plastic plywood. It is not solid and the literature states it can form to non flat surfaces. I am sure you cannot drill and tap the Groco backing plates. The backing plates would only be of use if you plan to through bolt a seacock or Groco adaptor plate. These cannot be used like Maine sail drill and taps the G10 and epoxies to the hull.
I couldn't find any place that sells them. I thought I could save a step and save having to buy a big hole saw if I could buy a pre-shaped backing plate, but although they're in the catalog I couldn't find any website selling them.
05-12-2014 06:54 PM
casey1999
Re: 1st big project, bronze thru-hull

Quote:
Originally Posted by mitiempo View Post
Groco has backing blocks similar to Mainesail's no through bolt method. They don't state what material they are, I guess fiberglass.

From Groco's catalog:

A few months back I called Groco and asked what material their backing plate was made of. The tech support did not know exactly, but said the material is like a man made plastic plywood. It is not solid and the literature states it can form to non flat surfaces. I am sure you cannot drill and tap the Groco backing plates. The backing plates would only be of use if you plan to through bolt a seacock or Groco adaptor plate. These cannot be used like Maine sail drill and taps the G10 and epoxies to the hull.
This thread has more than 10 replies. Click here to review the whole thread.

 
Posting Rules
You may post new threads
You may post replies
You may post attachments
You may edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is On


All times are GMT -4. The time now is 06:59 PM.

Add to My Yahoo!         
Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2014, vBulletin Solutions, Inc.
SEO by vBSEO 3.6.1
(c) Marine.com LLC 2000-2012

The SailNet.com store is owned and operated by a company independent of the SailNet.com forum. You are now leaving the SailNet forum. Click OK to continue or Cancel to return to the SailNet forum.