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How do you prevent pieces moving when using pocket holes?

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Forum topic by InstantSiv posted 153 days ago 807 views 0 times favorited 16 replies Add to Favorites Watch
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InstantSiv

86 posts in 220 days


153 days ago

Topic tags/keywords: pocket hole kreg clamp jig screw flush

Hi, I cannot figure why I am still getting movement when clamping pieces and using pocket holes(see pic for orientation of pieces, sorry for quality… drawn on tablet). I need the two pieces to be perfectly flush with one another because I am flush trimming and using those as the bearing surface. Kreg makes a specific clamp for that orientation but the reviews say that it’s prone to breaking. I made a quick clamping jig(pictured) to clamp the pieces but the pieces move and are not flush.

What are your thoughts?

-- More is always better. More tools, more power,... oh and more fingers ;)


16 replies so far

View levan's profile (online now)

levan

405 posts in 1605 days


#1 posted 153 days ago

lOOKS LIKE THAT SHOULD WORK. Must be slipping on part b. Maybe you could put a clamp from the end of part B to the corner jig, If you have a deep ingagement clamp long enough. You might also try putting stick on sand paper on you corner jig to help with slipping.

-- Lynn "If you think you can do a thing or think you can't do a thing, you're right". Henry Ford

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a1Jim

112010 posts in 2202 days


#2 posted 153 days ago

Maybe I’m saying the same thing as Lynn
clamp part “B”to the bench then put a board as a stop on the end your going to screw together also on part “B”
put a clamp on the stop block and the other end of part “B”. The stop block will prevent Part”A” from slipping outward.

-- http://artisticwoodstudio.com Custom furniture

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Nicky

636 posts in 2717 days


#3 posted 153 days ago

I just did a fair amount of experimenting with pocket holes. If you screw down to tight, the joint will be uneven. Also after drilling the pocket holes, try a pilot hole with the pieces clamped (1/8” worked for me)

I’ve gotten close but not perfect.

-- Nicky

View Loren's profile

Loren

7389 posts in 2273 days


#4 posted 153 days ago

Glue them first.

-- http://lawoodworking.com

View MT_Stringer's profile

MT_Stringer

1831 posts in 1856 days


#5 posted 153 days ago

Clamp the heck out of them. You are about four clamps too short. :-)
I clamp the workpieces to the table.

-- Handcrafted by Mike Henderson - Channelview, Texas

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Redoak49

306 posts in 614 days


#6 posted 153 days ago

I do not have that kind of problem but you need to clamp things tightly and not let them move. The idea for sandpaper glued into the jig is a good one.

View Whiskers's profile

Whiskers

389 posts in 652 days


#7 posted 153 days ago

One thing that helps with pocket holes to prevent movement is don’t run them all the way down tight at first. Get screws in both holes most of the way than finish them off. You might also want to add a sliver of 1×2 along the inside edge on top of part B and up against A so that A is engulfed on both sides.

View pintodeluxe's profile (online now)

pintodeluxe

3318 posts in 1438 days


#8 posted 153 days ago

Use the kreg brand clamp, and set it fairly tight. It works much better than a standard F style clamp. Also, you can pre-drill the pocket scew with a pilot bit, but it is usually not required.

-- Willie, Washington "If You Choose Not To Decide, You Still Have Made a Choice" - Rush

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MT_Stringer

1831 posts in 1856 days


#9 posted 153 days ago

@OP – I was looking at your drawing again. If it was me, I would rotate your workpieces 90 deg to the left. That way, the piece with the pocket holes is on the table.

Use whatever means you can cobble up to capture the vertical piece so it can’t move backwards , left or right.
Clamp the piece with the pockets to the table and run the screws in. I have done this before. It should pull up tight.

Good luck.

Note: It is not beyond me to drill holes in the table, or make up temporary clamping jigs so I can secure the workpieces. I do whatever it takes. Sometimes those videos you may see on UTube, aren’t as simple as it seams.

Good luck.

-- Handcrafted by Mike Henderson - Channelview, Texas

View cabmaker's profile

cabmaker

1305 posts in 1434 days


#10 posted 153 days ago

I used to do it with a ritter table and pneumatic plungers. Check em out!

View Craftsman on the lake's profile

Craftsman on the lake

2382 posts in 2063 days


#11 posted 153 days ago

Clamping it correctly should work but I often assemble things with a pin nailer. The nails are about the size of a thin sewing needle with no head. You can’t see the place it was nailed unless you get really close and really hunt for it. And they hold amazingly well. Glue / pin nail / then screw.

-- The smell of wood, coffee in the cup, the wife let's me do my thing, the lake is peaceful.

View InstantSiv's profile

InstantSiv

86 posts in 220 days


#12 posted 153 days ago

Thank you everyone for the responses.

I kinda dismissed part b moving because I didn’t see any movement while screwing. I’ll have to rethink that and secure part b. I’m going to try the sand paper first and if that doesn’t work then try to clamp part b to prevent movement.

I’ve also heard of sprinkling sand, rubbing sand paper together, over the glue to prevent two pieces from shifting around while gluing. Anyone heard of this? I think it was to prevent minor shift while clamping so I don’t know how well it would work with pocket joints.

Thanks again. I’ll report back with my findings.

-- More is always better. More tools, more power,... oh and more fingers ;)

View InstantSiv's profile

InstantSiv

86 posts in 220 days


#13 posted 153 days ago

Okay just got done experimenting a little.

Sand paper on the jig still caused movement. I was a bit disappointed this didn’t work because it was a super simple and elegant way to solve the issue. I then tried what MTStringer suggested(putting part A flat on the table) and the experimental jig I threw together worked!

Part C & D was just scrap wood I clamped together(not shown in pic). C/D was clamped to the table top with a single clamp. Part B is pushed into part C/D by Part A. Part A is clamped to the table. Part B was simply held down by my free hand because I don’t have clamps longer than the piece. Perfectly flush tight joint.

I’m still going to have to design a better jig than this but I think it’s a working concept. Thank you MTStringer for the suggestion and others who have chimed in. This has been racking my brain for a while now.

-- More is always better. More tools, more power,... oh and more fingers ;)

View a1Jim's profile

a1Jim

112010 posts in 2202 days


#14 posted 153 days ago

After all is said and done I agree with Loren just glue it first ,let dry then ad pocket screws.

-- http://artisticwoodstudio.com Custom furniture

View bowedcurly's profile

bowedcurly

479 posts in 354 days


#15 posted 153 days ago

use a mig welder, just kiddin, pilot holes work well, and bigger clamps

-- Staining killed the wood<<<<<>>>>>Dyeing gave it life

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