Kreg question - Woodworking Talk - Woodworkers Forum
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post #1 of 24 Old 12-31-2017, 06:10 PM Thread Starter
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Kreg question

I'm looking to attach a 3/4" thick by 3/4" wide oak facing on the front edge of a 3/4" thick piece of plywood. Can this be done with the standard 1-1/4" Kreg screws without coming through the front (or side) of the oak facing? I've attached a diagram in case the explanation isn't obvious.

The entire assembly is several feet long, so I'd endeavor to put a Kreg screw in every 8" or so, alternating direction.

Thanks in advance.
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post #2 of 24 Old 12-31-2017, 06:19 PM
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Screws in plywood, IMHO, would be very weak. From plywood to the oak should be OK. I suggest you experiment with scrap first.

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post #3 of 24 Old 12-31-2017, 06:19 PM
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Instead of using the kreg tool why not just put some glue on the edge of the plywood and apply the 3/4" strip with a few finishing nails. You could also clamp the strip on or if you don't have clamps you could just use some masking tape to hold the strip to the plywood until the glue dries.
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post #4 of 24 Old 12-31-2017, 06:26 PM Thread Starter
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I want these facings to be pretty strong, so I was planning on screwing AND gluing. But if you feel the glue would be enough, that would solve my problem, obviously.

I screwed around with my CAD program a bit and this is what I came up with, using a 15 degree pocket hole, 3/8" Kreg drill bit, and using a 2-1/8" edge for the rear of the pocket hole (mentioned in another forum). Looks like a 1-1/4" screw would be WAY too long, but a 3/4" screw might work.
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post #5 of 24 Old 12-31-2017, 07:59 PM
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Like this? Never had any problems. The screws just act as mini clamps until the glue dries. :-)
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post #6 of 24 Old 12-31-2017, 08:35 PM Thread Starter
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Quote:
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Like this? Never had any problems. The screws just act as mini clamps until the glue dries. :-)
Like that, yes. But in my case, the facings are only 3/4" wide. So I was initially concerned the screw might come out the side.

What length screws did you use on that joinery? Based on my CAD drawing, 1-1/4" would be too long and Kreg doesn't make anything less than 1". I suppose I could just buy some shorter standard wood screws. The washer heads of the Kreg screws are nice, but not super necessary.

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post #7 of 24 Old 12-31-2017, 09:27 PM
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If you were going to do it a lot, you could get the Kreg mini block to fit your jig. Drills smaller holes, can use 3/4 inch screws.

Since 1 1/4 inch screws are suppose to attach 3/4 inch to 3/4 inch wood, you should, in theory, be more then safe with 1 inch screws.


In woodworking there is always more then one way to accomplish something.
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post #8 of 24 Old 01-01-2018, 12:44 AM
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Quote:
Originally Posted by st.ryder64 View Post
Like that, yes. But in my case, the facings are only 3/4" wide. So I was initially concerned the screw might come out the side.

What length screws did you use on that joinery? Based on my CAD drawing, 1-1/4" would be too long and Kreg doesn't make anything less than 1". I suppose I could just buy some shorter standard wood screws. The washer heads of the Kreg screws are nice, but not super necessary.
Question...have you used a Kreg jig to test your project?

1 1/4 inch screws are the correct length. Also, the Kreg screws work great. The washer head acts like a clamp pulling the two pieces together as you screw them in. If you jig is set correctly, the facing should not split, but I can't guarantee it.

Seriously, test to make sure so you won't mess up.
Good luck.
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post #9 of 24 Old 01-01-2018, 05:48 AM
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What are these assemblies doing that you need that much holding power? I'm with Steve - glue and finish nail and be done.

Based on your drawings - you've got the screw head way to close to the edge/joint of the pieces. Usually the head is back 5/8 or so from the joint. Your drawing shows it around 1/8. The head needs some meat to keep it from pulling through.

I'd likely use 1" fine thread pocket screws for this application. Even still, I'd be concerned about splitting the piece using screws without pre-drilling.
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post #10 of 24 Old 01-01-2018, 07:40 AM
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The manual that comes with the Kreg Jig will show you what you need to know.
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post #11 of 24 Old 01-01-2018, 07:57 AM
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Glue and clamps or a pin are fine...
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post #12 of 24 Old 01-01-2018, 08:28 AM
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Glue and clamps or a pin are fine...
I am extremely jealous of your clamp collection!!!
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post #13 of 24 Old 01-01-2018, 09:09 AM
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I am extremely jealous of your clamp collection!!!
Actually have to many and will have to sell some...
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post #14 of 24 Old 01-01-2018, 09:25 AM
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To the OP, that is what they are designed for.

link

The question can get back to is it the easiest or best method of attaching that 3/4 piece to the edge of that plywood? That can be debated for days.
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post #15 of 24 Old 01-01-2018, 10:28 AM
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Quote:
Originally Posted by Steve Neul View Post
Instead of using the kreg tool why not just put some glue on the edge of the plywood and apply the 3/4" strip with a few finishing nails. You could also clamp the strip on or if you don't have clamps you could just use some masking tape to hold the strip to the plywood until the glue dries.
Completely agree. Using screws is totally unnecessary. I would not even use the nails. Use some 22 gauge brads to hold location and then clamps.

It is a puzzle to my why people just keep underestimating the strength of a good glue joint.

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post #16 of 24 Old 01-01-2018, 10:47 AM
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Rebelwork, how about a separate thread on this project in the photo? Interesting.

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post #17 of 24 Old 01-01-2018, 11:00 AM
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I wouldn't trust screws and just glue in your case. I like the idea of pins or better yet dowels.. With an accurate dowel jig you can bury the dowels nice and deep into the plywood edge.
Pins might be the same thing as dowels in this case..I dunno.
I'm a dowel affectionato..
Another upside to dowels is nobody will ever see them..and don't use those cheapo store bought fluted dowels. Cut them to size from full sized 36" dowels and bevel the leading edge..

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post #18 of 24 Old 01-01-2018, 11:14 AM
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Rebelwork, how about a separate thread on this project in the photo? Interesting.
Think this was for a customer in 2005. Two cd racks and a flat screen in the center and some other stuff..
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post #19 of 24 Old 01-01-2018, 11:30 AM
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Originally Posted by allpurpose View Post
I wouldn't trust screws and just glue in your case. I like the idea of pins or better yet dowels.. With an accurate dowel jig you can bury the dowels nice and deep into the plywood edge.
Pins might be the same thing as dowels in this case..I dunno.
I'm a dowel affectionato..
Another upside to dowels is nobody will ever see them..and don't use those cheapo store bought fluted dowels. Cut them to size from full sized 36" dowels and bevel the leading edge..
Please explain why you would not trust?

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post #20 of 24 Old 01-01-2018, 11:30 AM
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Quote:
Originally Posted by Steve Neul View Post
Instead of using the kreg tool why not just put some glue on the edge of the plywood and apply the 3/4" strip with a few finishing nails. You could also clamp the strip on or if you don't have clamps you could just use some masking tape to hold the strip to the plywood until the glue dries.
+1: This is the normal way to face a plywood edge.
You can also route the edge before applying to give you a dressed edge.
No screws.

If you don't have time to do it right the first time, when will you have time to do it over?
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