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Forum topic by swarfrat posted 06-25-2014 10:18 AM 785 views 0 times favorited 12 replies Add to Favorites Watch
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swarfrat

21 posts in 210 days


06-25-2014 10:18 AM

I’m putting threaded inserts into wenge. It’s super hard and splinter prone, and the insert started pulling up chips, so I’m tapping first. EZ Lok 300-008 external threads are 5/16-16. I did the math and a test in oak, and a common 3/8-16 tap has about 50% thread engagement and fits snug in the hole.

Is it ok, or perhaps even a good idea to tap 3/8-16 and epoxy the insert in place rather than trying to tap it 5/16-16? It’s going in a guitar neck, 8-32 machine screws and typically installed “snugly”.


12 replies so far

View Redoak49's profile

Redoak49

485 posts in 743 days


#1 posted 06-25-2014 11:35 AM

Wenge is a difficult wood to work with. I think your idea is good but would test it in a scrap and make certain the epoxy will hold in the Wenge.

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swarfrat

21 posts in 210 days


#2 posted 06-25-2014 12:56 PM

I don’t have any scrap wenge. There is a supplier a few towns over but buying 1 bf for 16.75 to drill practice holes is hard to stomach. Not as hard as screwing up a $300 neck thouh, so I’ll probably do it anyway after testing in oak. It just pains me to buy scrap wood.

View MrRon's profile

MrRon

2993 posts in 1998 days


#3 posted 06-25-2014 04:38 PM

A 3/8-16 tap takes a 5/16” drill. Try a drill one size smaller (19/64”). This should give you a tighter fit.

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swarfrat

21 posts in 210 days


#4 posted 06-26-2014 01:06 AM

I found an old thread here supporting the idea of tapping a hair oversize and using glue. Wenge is dense but not super oily. Saw several mentions of titebond ii. But what about letting thin CA fill the thread gap? Its not a traditional glue joint It’s basically a rigid equivalent to Teflon tape. It does need to get a grip on the brass too, nut that can be purely mechanical. They even provide a handy anti rotation slot in the bottom cleverly disguised to look like a screwdriver slot in the top

View shampeon's profile

shampeon

1378 posts in 938 days


#5 posted 06-26-2014 01:46 AM

I just tapped the wood on this wenge marking gauge, then squirted in thin CA for extra strength.
Click for details

-- ian | "You can't stop what's coming. It ain't all waiting on you. That's vanity."

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hairy

2109 posts in 2287 days


#6 posted 06-26-2014 12:27 PM

When I tap wood, I use a slightly smaller bit than would be called for in metal to drill and tap the same hole. I have not had good luck tapping end grain. It drills and taps easy enough, it just won’t hold for long. Drill, then tap, then flood with thin CA glue. Wait until the glue is definitely dry, then re – tap.

Have you seen this? http://www.ezlok.com/InsertsWood/hardWood.html

-- in the confusion, I mighta grabbed the gold ...

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swarfrat

21 posts in 210 days


#7 posted 06-26-2014 02:04 PM

Yes. I’m using ez lok 400-008. They don’t publish the external thread specs but it’s. 5/16-16. Something I just thought of since I do have a lathe is just drilling and tapping a 3/8-16 bolt and calling it a day. I don’t know why it never occurred to me.

View Greg..the Cajun Wood Artist's profile

Greg..the Cajun Wood Artist

5283 posts in 2063 days


#8 posted 06-26-2014 03:01 PM

Many wood such as oak are easier to tap than Wenge. Another solution would be to drill a 1/2” hole in the Wenge and insert a dowel that can be tapped more successfully.. I’ve done this in softer woods to strengthen them for inserting pin hinges.

-- Each step of every Wood Art project I design and build is considered my masterpieceā€¦ because I want the finished product to reflect the quality and creativeness of my work

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swarfrat

21 posts in 210 days


#9 posted 06-26-2014 06:06 PM

An oak insert to hold the brass insert to hold the machine screw?

View ADHDan's profile

ADHDan

623 posts in 863 days


#10 posted 06-26-2014 06:19 PM

Despite the “Ms. O’Leary’s Cow” aspect of Greg’s solution, that’s what I’ve done to install threaded inserts in materials that tend to strip out, such as softer woods and particleboard.

-- Dan in Minneapolis, woodworking since 11/11.

View MrRon's profile

MrRon

2993 posts in 1998 days


#11 posted 06-26-2014 08:43 PM

You could use a helicoil insert.

View BrettUK's profile

BrettUK

6 posts in 83 days


#12 posted 10-30-2014 01:38 PM



You could use a helicoil insert.

- MrRon

It is difficult to work with but I agree with Ron, helicoil insert would be the best approach.

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