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Re: Material: hatch magnets
By:Rob Macks
Date: 2/21/2003, 5:11 pm
In Response To: Re: Material: hatch magnets *Pic* (Chris Moore)

: What combination of magnets are you using, and how did you arrive
: at that? I think that's my one concern with the magnet idea is
: finding that they're either too strong or not strong enough. Is
: it pretty easy to test various configurations? I guess I'm not
: completely clear on the construction method, but it seemed to me
: that you wouldn't know how much pull you'd end up with until after
: it's all laid up and the epoxy is hard.

I use rare earth magnets on the flush hatches of my kayaks.

You need a magnet to magnet contact for the strength needed to bridge the gap until your gasket compresses.
You must use a soft gasket material that comprsses very well.
Gasket material is available from Newfound Woodworks or I also sell gasket material.

I use the 1/2" diameter X 1/8" thick magnets available from Lee Valley Tool;
http://www.LeeValley.com/

The magnets are recessed into the hatch cover and hatch lip on the deck. I use eight on the hatch cover and eight on the hatch lip. A total of 16 per hatch. This may sound like a lot but I did extensive research and found the number and configuration I'm discribing works the best.
4 per side spaced about 3' apart.

The magnets rust if not totally sealed, so i cover them with a layer of 4 oz. glass.

The waterproofness was tested with rolls at last fall's Newfound Rendezvous.

Aligning the mating pairs is important. MAKE SURE THE POLES ARE ALIGNED SO THE MAGNETS ATTRACT, NOT REPEL!

You MUST BE WARE the magnets will effect any compass placed in close proximity.

I found the magnets effected my compass if it came within 15” of the hatch cover.

If you would like more detailed information on making flush hatches closed with rare earth magnets contact me.

All the best,
Rob

Messages In This Thread

Material: hatch magnets
john -- 2/18/2003, 11:19 pm
Re: Material: hatch magnets
Mike and Rikki -- 2/19/2003, 1:20 am
Re: Material: hatch magnets
Larry -- 2/19/2003, 12:27 pm
Re: Material: hatch magnets
Rob Macks -- 2/19/2003, 6:12 pm
Re: Material: hatch magnets *Pic*
Chris Moore -- 2/20/2003, 11:01 am
Re: Material: hatch magnets
Rob Macks -- 2/21/2003, 5:11 pm
What is it with wives and fridges? *NM*
Mark Kopp -- 2/21/2003, 1:12 am
Random links
A_M_P------------QWwQY+9YyTVMlRUmM5EdXJ -- 2/20/2003, 8:34 pm
Is that a password hash in my username? Weird *NM*
A_M_P -- 2/20/2003, 8:38 pm
Re: Material: hatch magnets
Larry -- 2/20/2003, 1:02 am
Re: Material: hatch magnets
Gordon Snapp -- 2/19/2003, 8:12 pm
Re: Material: hatch magnets
john -- 2/19/2003, 9:22 am
Magnets, memory and hair loss
Mike and Rikki -- 2/19/2003, 2:12 pm
Re: Material: hatch magnets
john -- 2/19/2003, 9:24 am
Re: Material: hatch magnets
Larry -- 2/18/2003, 11:50 pm
Re: Material: hatch magnets
john -- 2/19/2003, 9:13 am
Re: Material: hatch magnets
William Cruz -- 2/19/2003, 12:37 am
Re: Material: hatch magnets
Larry -- 2/20/2003, 12:16 am
Re: Material: hatch magnets
William Cruz -- 2/21/2003, 12:02 am
Re: Material: hatch magnets
William Cruz -- 2/21/2003, 1:29 pm
Re: Material: hatch magnets
Nick Schade - Guillemot Kayaks -- 2/19/2003, 10:30 am
Re: Material: hatch magnets
john -- 2/19/2003, 9:17 am