Custom cut round plastic window for forward hatch - Page 2 - SailNet Community

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  #11  
Old 07-19-2012
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Re: Custom cut round plastic window for forward hatch

I was thinking of a mechanical ring or stop of some sort. Is there nothing but adhesive holding in the glazing on this type hatch? Most hatch inserts are held in both sides with a retaining ring. The matching rabbets should be on the inside with an inside plate/stop over the plexiglass to hold it in. The rabbet on the glazing should be what brings it up to exterior surface height. Maybe that's what the OP is describing.

I just finished replacing a piece of broken glass in a small port. Used a leftover piece of 3/8" acrylic. It was easy to do the rabbeting with a table saw, setting the blade depth and fence to right depths and then running the glass upright along the fence, rotating it around.
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Old 07-19-2012
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Re: Custom cut round plastic window for forward hatch

Romario, it sounds like a simple piece of 1/4" plexiglass (acrylic) that has had a 1/8" bevel cut into the edge with a router. For a plexi shop this is a simply job. But a lot of plastics shops are used to indoor work done cheap, and the raw material is bought in 4x8 foot sheets, so if you want something they don't have, they cleverly try to charge you for the whole sheet and keep the rest. (Ouch.)

For hatches (and ignoring the question of using cast acrylic instead of "structured" aka sheet material) you will get better life by looking for an acrylic that is meant for use as outdoor glazing, that is UV-resistant and scratch-resistant. If you find a shop that doesn't get all upset when you ask about this, the odds are they have the right material and are a better place to work with.

I'd guess the price of the job would be $50-100 depending on local prices.

But the plastic you dropped overboard? Technically, that's a MARPOL violation and a serious fine for putting plastic in the water. If it was at the dock...Heck, you'll save at least $50 by getting a mask and diving down to look for it. :-)
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Old 07-19-2012
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Re: Custom cut round plastic window for forward hatch

Quote:
If it was at the dock...Heck, you'll save at least $50 by getting a mask and diving down to look for it. :-)
Better yet, throw the GF overboard with a mask to find the thing.
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  #14  
Old 07-23-2012
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Re: Custom cut round plastic window for forward hatch

Quote:
Originally Posted by hellosailor View Post
For hatches (and ignoring the question of using cast acrylic instead of "structured" aka sheet material) you will get better life by looking for an acrylic that is meant for use as outdoor glazing, that is UV-resistant and scratch-resistant. If you find a shop that doesn't get all upset when you ask about this, the odds are they have the right material and are a better place to work with.

I'd guess the price of the job would be $50-100 depending on local prices.
The best quote I got so far is $90 with a week lead time. There were actually only 3 replies from the dozen or so places I sent a request to, from 200 to 90 dollars quotes.

Quote:
But the plastic you dropped overboard? Technically, that's a MARPOL violation and a serious fine for putting plastic in the water. If it was at the dock...Heck, you'll save at least $50 by getting a mask and diving down to look for it. :-)
I wish I could get it back, I saw it sinking while we were under sail, I even contemplated jumping in for a second, but it was too late, by the time I jumped we would be too far away and the lens was sinking too fast.
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Old 07-23-2012
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Re: Custom cut round plastic window for forward hatch

Quote:
Originally Posted by smurphny View Post
I was thinking of a mechanical ring or stop of some sort. Is there nothing but adhesive holding in the glazing on this type hatch? Most hatch inserts are held in both sides with a retaining ring. The matching rabbets should be on the inside with an inside plate/stop over the plexiglass to hold it in. The rabbet on the glazing should be what brings it up to exterior surface height. Maybe that's what the OP is describing.

I just finished replacing a piece of broken glass in a small port. Used a leftover piece of 3/8" acrylic. It was easy to do the rabbeting with a table saw, setting the blade depth and fence to right depths and then running the glass upright along the fence, rotating it around.
I think you're describing the system used on opening portlights, particularly those with glass rather than plastic lenses. Modern deck hatches have the lens simply bonded in place with a combination adhesive/sealant like Dow 795.
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