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Forum topic by MrRon posted 09-13-2011 10:31 PM 15790 views 2 times favorited 24 replies

MrRon

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09-13-2011 10:31 PM

Which joint is stronger?


24 replies so far

chrisstef

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#1 posted for 1 last update 2020/05/25 09-13-2011 10:41 PM #1 posted 09-13-2011 10:41 PM

The one with the the 1 last update 2020/05/25 most glue. ;)The one with the most glue. ;)

-- Its not a crack, its a casting imperfection.

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#2 posted 09-13-2011 11:50 PM

Woodworking Planshow to Woodworking Plans for Half lap should be easier, and i agree with cr1 about the end grain, so I would go with the half lap.

Viktor

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#3 posted 09-13-2011 11:52 PM

Scarf joint is stronger if you have slope ratio ~ 1:8 – 1:10 or more. You should also have contact surfaces as a single plane (in your picture it is more of a combianation of half-lap and scarf).
Old discussion on the topic here: http://lumberjocks.com/topics/14772 (there were more posts in that thread, but some members left and their replies were removed)
Scarf jount is used to extend boards in boat building and sometimes in bows to connect two limbs.

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#4 posted 09-14-2011 12:00 AM

Either way … could you peg it, in the application you’re looking at ?

A little more mechanical strength … wouldn’t hurt.

-- -- Neil

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#5 posted 09-14-2011 12:26 AM

The glue area is almost the same in each joint. So far, it appears the half lap is easier to make. The scarf joint would require me to cut it freehand on the bandsaw and make the final fit by hand. The half lap joint would let me cut it in one operation on a table saw with just a little sanding touch-up. The scarf joint looks nicer, but I can’t see any strength advantage of one over the other.

fussy

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#6 posted 09-14-2011 03:41 AM

The half-lap is easier, hence less chance for error. Risk of poor fit eliminates any reason for trying a scarf, especially since glue areas are almost equal. Do the half lap and be done. What’x it for?

Steve

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