Author Topic: Scarf Joint Jig on Electric Planer, etc.  (Read 4440 times)

Offline backatit

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Scarf Joint Jig on Electric Planer, etc.
« on: September 01, 2016, 10:16:58 AM »
Hey guys,

I don't know if this is a well known jig for scarfing but I thought it looked good and if people didn't know about it might be helpful.  Also some glue up discussion.  Never know where a good idea will come from.

http://forum.woodenboat.com/showthread.php?110517-John-Henry-Easy-scarfing-and-glueup&highlight=John+Henry

Tony

Offline Cannon

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Re: Scarf Joint Jig on Electric Planer, etc.
« Reply #1 on: September 01, 2016, 03:49:38 PM »
Scarfing is a very simple process! Jig is not required
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Offline bullet

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Re: Scarf Joint Jig on Electric Planer, etc.
« Reply #2 on: September 01, 2016, 04:03:45 PM »
I used a planer, no jig. Stacked all ply and did it all at once. Quick and easy but not perfect. I would use a jig if I was building a la Mo'Poxy, otherwise not needed IMHO.

Offline MoPoxy

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Re: Scarf Joint Jig on Electric Planer, etc.
« Reply #3 on: September 01, 2016, 07:52:17 PM »
The John Henry jig is awesome but the power planer, purchased separately, is spendy.

For bright finish where you need tight joints, the jig is very helpful. I have found that a handheld belt sander is almost as good if I mark my lines well and use 80 or 120 grit to add patience and avoid over sanding.

For a painted boat, perfect scarph joints are not needed. In fact, imperfect joints with gobs of epoxy to fill the imperfections are better than perfect joints that are over-clamped and starved of epoxy.

I will never again try a scarphing jig on a circular saw, regardless of bright or painted.

More info at http://seascull.blogspot.com/2014/02/scarphing-101.html


« Last Edit: September 02, 2016, 12:40:51 PM by Mo 'Poxy »

Offline GS

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Re: Scarf Joint Jig on Electric Planer, etc.
« Reply #4 on: September 03, 2016, 05:32:44 AM »
Mo I think you did enjoy a "good joint" prior to writing your blog section on scarfing.  I think I saw potato chip crumbs in the epoxy on one of the pics.

Offline MoPoxy

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Re: Scarf Joint Jig on Electric Planer, etc.
« Reply #5 on: September 03, 2016, 09:04:20 PM »
I think I saw potato chip crumbs in the epoxy on one of the pics.

You have a keen eye. Those potato chip crumbs are from my experiments using potato chips and shredded Jockey shorts mixed with Loctite PL as a substitute for epoxy reinforced with fiberglass.


Offline GS

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Re: Scarf Joint Jig on Electric Planer, etc.
« Reply #6 on: September 04, 2016, 08:48:05 AM »
So you don't waste your time, I found the brown side of my Jockey shorts have a higher tensile strength than the yellow side.

Online MikeS

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Re: Scarf Joint Jig on Electric Planer, etc.
« Reply #7 on: September 10, 2016, 06:23:15 PM »
I've made scarfs several ways - every method mentioned works. Hands down, the easiest, quickest, cleanest, most precise scarfs were made with the scarf jig attached to my circular saw made to Renns specifications in the book. Well worth the effort to make this for your saw. 1/4" & 3/8" straight through. 1/2" goes deep enough for a perfect guide to finish by hand.

Offline gdwamsley

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Re: Scarf Joint Jig on Electric Planer, etc.
« Reply #8 on: September 11, 2016, 05:20:58 PM »
I agree with the jig method. We'll worth the time making it.  Quick finish on 1/2 inch and off to the races

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Offline fishbite

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Re: Scarf Joint Jig on Electric Planer, etc.
« Reply #9 on: September 13, 2016, 03:45:33 AM »
There's no right way, jig or bait as long as you get what you went out for aye.

I wish I'd made a jig rather than sanding them sheets down with a grinder.
If I'm not fishin I'm thinking bout fishin

Offline jerry bark

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Re: Scarf Joint Jig on Electric Planer, etc.
« Reply #10 on: September 13, 2016, 04:02:06 AM »
I've made scarfs several ways - every method mentioned works. Hands down, the easiest, quickest, cleanest, most precise scarfs were made with the scarf jig attached to my circular saw made to Renns specifications in the book. Well worth the effort to make this for your saw. 1/4" & 3/8" straight through. 1/2" goes deep enough for a perfect guide to finish by hand.

I made this jig too. I had an old craftsman saw that I had beat up pretty bad already so I removed the guards and made the opening large enough for an 8 inch blade and VIOLA!

one pass 1/2 inch scarfs.
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Offline AlasKen

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Re: Scarf Joint Jig on Electric Planer, etc.
« Reply #11 on: September 13, 2016, 10:00:53 AM »

I made this jig too. I had an old craftsman saw that I had beat up pretty bad already so I removed the guards and made the opening large enough for an 8 inch blade and VIOLA!

one pass 1/2 inch scarfs.

Any photos?  Ken
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Offline jerry bark

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Re: Scarf Joint Jig on Electric Planer, etc.
« Reply #12 on: September 14, 2016, 05:07:07 PM »

I made this jig too. I had an old craftsman saw that I had beat up pretty bad already so I removed the guards and made the opening large enough for an 8 inch blade and VIOLA!

one pass 1/2 inch scarfs.

Any photos?  Ken

I think there is one in my build thread, but it basically looks just like MikeS has in his photo. I just used a crappy old saw and took out the
guards.

Oh, found it: https://fishyfish.com/boards/general-discussion-tolman-skiffs/my-widebody-is-launched/msg15484/#msg15484
« Last Edit: September 14, 2016, 05:38:00 PM by jerry bark »
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Offline Rbob

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Re: Scarf Joint Jig on Electric Planer, etc.
« Reply #13 on: September 15, 2016, 10:09:45 AM »
I made a jig like MikeS a couple nights ago, so freakin easy to use, If you make the bottom piece thinner it will cut deeper, I bet 1/4" plywood for the bottom piece would work. I made it 18" long.  Just clamp a strait edge to the panel and go.  I attached drawing.
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Offline kiwi les

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Re: Scarf Joint Jig on Electric Planer, etc.
« Reply #14 on: October 17, 2016, 02:30:09 PM »
http://www.homemadetools.net/forum/plywood-scarfing-jig-44680#post64127

THERE YOU GO!
.
Hi guys I,m back. I have had a break for some time. Work commitments have kept me away from the board and my boat. Hardly touched the thing in 18 months, and have got to the point where I have forgotten what or where I was up to. Our summers just arriving and now able to carry on with glue ups, what ever they are.
Lots of time on my hand now, so I will just sit and think about it in my boat. I need my inertia and round toit motors running again.

les


 

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