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Thread: Eureka in Germany.
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30th April 2012, 06:33 PM #31Senior Member
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A couple of pics of the join that broke right through. I'm going with too much clamping pressure leaving not enough goo in the joint.
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30th April 2012 06:33 PM # ADSGoogle Adsense Advertisement
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1st May 2012, 01:20 AM #32Dave
StorerBoat Builder, Sailor, Enthusiast
Dave's GIS Chronicles | Dave's Lugs'l Chronicles | Dave's StorerBoat Forum Thread
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1st May 2012, 03:45 AM #33Senior Member
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How'd that song go "once bitten twice shy babe".
Would it work if I heated the join carefully with a heat gun and then slipped a chisel in to prise it apart ? I'm thinking the epoxy would soften with the heat making it easy to come apart. Well it seems there's not much epoxy in there .
Kev.
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1st May 2012, 10:27 PM #34
Hey Kev,
A mix of too much clamping pressure and maybe too much absorption of the epoxy by the end grain. Maybe not quite enough glue to start with.
Did you see the Appendix on "gluing end grain"?
MIK
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2nd May 2012, 12:10 AM #35Senior Member
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Hi Mik.
Yeah, I read through the appendix again and also through some of the stuff on here and your web site. I'll glue them tomorrow and take my time and make sure I get it right this time.
Kev.
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3rd May 2012, 03:46 AM #36Senior Member
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OK. I painted the joins with neat epoxy and let them sit for fifteen minutes and painted them again. The first time some soaked up the epoxy straight away so I gave them some more. I waited another fifteen minutes and then coated them with an epoxy glueing powder mix and then clamped them together. I just used a single clamp with just enough pressure to bring them together. Now I'll just have to see what happens.
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3rd May 2012, 03:59 AM #37Senior Member
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Fillets.
I've been sanding the fillets and there are small shiny patches still showing through. Will I have sand them down until the shine has gone ? I'm wondering whether the varnish will bond to these patches.
This photo with the lighting's for Mik.
Kev.
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3rd May 2012, 04:49 AM #38Member
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Give them a scrub with a wet "scotchbrite" pad (like this) and it'll wash off any amine blush and give the surface a slightly roughness ready for finishing. It will conform to the surface so you'll get all the hollows, but of course it won't flatten the surface like sanding. As long as you're happy with those hollows showing up in the varnish (I would be fine with it) then it should work well.
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3rd May 2012, 05:25 AM #39Senior Member
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Thanks Andy.
I'm happy with those fillets. I like the hand made look. I had quite a bit of trouble getting the surface of the fillets smooth. At first I used a piece of ply 20mm wide shaped like a chisel, and then cut down a plastic scraper and last of all a metal scraper but they all seemed to drag the surface of the fillet. I'm not dissapointed with them. It's nothing a bit of elbow grease and a scotch brite won't fix.
Kev.
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6th May 2012, 05:07 AM #40Senior Member
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I had a relatively uneventful canoe building day today .
I sanded down the gunwales and clamped them on. When the scarfs came apart I had just set up a centre line and was preparing to fit the bulkheads so I'd allready had the practice.I used Biting Midge's idea of setting up a centre line and squaring and plumbing off that. It worked well. Actually, after years of bricklaying and concrete form work, it was a bit of a doddle . I had cut the bulkheads to Miks specs. so then it was a case of trial fitting and shaving pieces off. I cut the deck curve and clamped them and then mixed up some goo and filleted them in.
I had a nice day.
Well sort of. For some reason I can't upload my pics.
Kev.
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6th May 2012, 05:53 AM #41Senior Member
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6th May 2012, 02:13 PM #42
Very nice Kev!
Woodworks forum was offline on and off as they did some maintenance. That might have been why you had trouble uploading pics
That is a very pretty bulkhead pic!
MIK
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6th May 2012, 05:32 PM #43Senior Member
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Thanks Mik.
That must have been the problem. Here's the rest of the pic's.
Kev.
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8th May 2012, 06:11 AM #44Senior Member
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I cut the deck supports and centre stringers today and was about to cut the side supports but then couldn't figure how to measure and cut the supports with the clamps in the way. I figured that if I take the gunwale away I'll lose the curve/fairness from the bulkheads to the stems. Is this something I shouldn't worry about ?
The other thing is when fitting the gunwale what happens to the temporary centre spreader. As it's screwed from the outside the screws have to come out. I'm just thinking I could cut another spreader to go underneath and later use the same screw holes for the permanent spreader. Or is there another way ?
Kev.
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10th May 2012, 04:38 AM #45
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