LumberJocks

Threaded inserts

  • Advertise with us

« back to Woodworking Skill Share forum

Forum topic by swarfrat posted 28 days ago 511 views 0 times favorited 11 replies Add to Favorites Watch
View swarfrat's profile

swarfrat

18 posts in 51 days


28 days ago

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”.


11 replies so far

View Redoak49's profile (online now)

Redoak49

262 posts in 585 days


#1 posted 28 days ago

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.

View swarfrat's profile

swarfrat

18 posts in 51 days


#2 posted 28 days ago

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

2716 posts in 1840 days


#3 posted 28 days ago

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.

View swarfrat's profile

swarfrat

18 posts in 51 days


#4 posted 27 days ago

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 (online now)

shampeon

1260 posts in 780 days


#5 posted 27 days ago

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."

View hairy's profile

hairy

1988 posts in 2128 days


#6 posted 27 days ago

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

-- what a long, strange trip it's been...

View swarfrat's profile

swarfrat

18 posts in 51 days


#7 posted 27 days ago

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 Box Sculptor's profile

Greg The Cajun Box Sculptor

4928 posts in 1905 days


#8 posted 27 days ago

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.

-- Every step of each project is considered my masterpiece because I want the finished product to reflect the quality of my work.

View swarfrat's profile

swarfrat

18 posts in 51 days


#9 posted 27 days ago

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

View ADHDan's profile

ADHDan

420 posts in 705 days


#10 posted 27 days ago

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

2716 posts in 1840 days


#11 posted 26 days ago

You could use a helicoil insert.

Have your say...

You must be signed in to reply.

DISCLAIMER: Any posts on LJ are posted by individuals acting in their own right and do not necessarily reflect the views of LJ. LJ will not be held liable for the actions of any user.

Latest Projects | Latest Blog Entries | Latest Forum Topics

HomeRefurbers.com

Latest Projects | Latest Blog Entries | Latest Forum Topics

GardenTenders.com :: gardening showcase