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TOPIC: Stopping a crack!!

Stopping a crack!! 10 months 2 weeks ago #133779

I had my own ideas on how to deal with this, but thought I'd ask first before I do anything..
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Stopping a crack!! 10 months 2 weeks ago #133782

my understanding is to drill a small hole at the end of the crack to stop the progression

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Stopping a crack!! 10 months 2 weeks ago #133787

i have heard that also...ron

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Stopping a crack!! 10 months 2 weeks ago #133788

Hole was my first thought,.. just didn't know if there might be something else I should do in conjunction with..

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Stopping a crack!! 10 months 2 weeks ago #133797

It is called a "stop drill". In order for it to be effective, you will need 1/4" hole. Problem is the plastic will want splinter out on the back side. I'd use a 3/16 bit followed by a stepped reamer to the final 1/4 size.

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Stopping a crack!! 10 months 2 weeks ago #133799

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The ebay item id given is invalid, no result has been sentI would go with the smaller hole. You can then fill the hole with this UV glue. I bought this stuff online, cheap. It's plastic and can be sanded, buffed, and painted or just let clear.

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Stopping a crack!! 10 months 2 weeks ago #133801

Cal,

The idea of a stop drill is to provide a place where the stress at end of the crack is dissipated into the surrounding material. A smaller hole will not provide a large enough area to be effective long term.

In my 25 years of aircraft maintenance, stop drills were always 1/4"

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Stopping a crack!! 10 months 2 weeks ago #133806

I knew I was going to be drilling a hole.. Wanted to hear from some experience doing so,.. Lately I seem to rush into things without thinking it through.. I also ordered some Weldon3 to address the crack.. Its on the corner in a location that won't be too much of a problem aesthetically.. I'll just have to keep an eye on it,.. Its hard to believe that the windshield is as old as the boat.. Is there anyone making them??

Stan

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Stopping a crack!! 10 months 2 weeks ago #133811

i imagine if you can get an old classic re- manufactured, you can surely get a windshield. i think the company that makes the boats is in Canada. i had inquired a few years ago about making a twin of mine. they required all the spec's, and the hull is all they do. if i remember mine was $6,000 and you had to arrange shipping at your cost.

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Stopping a crack!! 10 months 1 week ago #133849

I chamfered the hole a bit,just to get rid of the sharp edge..
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Stopping a crack!! 10 months 1 week ago #133856

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Nice looking work. I assume best to use the sharpest (new if possible) bit. Do you use somewhat slow rpm and little pressure? I am picturing a small continuous spiral of plastic rotating around that bit. Did you do a tiny pilot first and then also drill from both sides to prevent chipping before you chamfered? I just want to get this procedure correct should I need to do it. Thanks for thread and picture!

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Stopping a crack!! 10 months 1 week ago #133863

Looks good

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Stopping a crack!! 10 months 1 week ago #133876

I used the smallest bit I had as a starter.. 1/16th I believe.. then up from there.. I used my Dewalt cordless, not too slow, don't want it to catch the edge of the crack and tear out material , but not too fast.. no pressure!! The bit will try to pull itself if you aren't careful.. used a step bit, by hand, to chamfer the hole on both sides.. My Weldon3 came today, so I used that in the crack itself.. Hopefully it will stay put..

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Stopping a crack!! 10 months 1 week ago #133877

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Thanks for that detailed explanation. Just what I needed. Good luck with the rest!

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Dr.Go!
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