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dw's shop tips #2: Threaded inserts? Really.

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Blog entry by Don W posted 1121 days ago 1734 reads 3 times favorited 4 comments Add to Favorites Watch
« Part 1: 3-4-5 rule. Part 2 of dw's shop tips series Part 3: Pilot hole without a drill bit. »

All of the projects and plans you see that use a threaded bolt for adjustment or tightening calls for inserts. I never have an insert when I need one and I’m not great for planning projects ahead of time. In most hardwood, just threading the wood will suffice. Choose a drill bit one size smaller than (about 1/16”) the size of the bolt or screw. If in doubt, go small (within reason). You can then thread as if you would any metal piece, but cutting oil isn’t required.

Don’t have a tap and die set? Take a bolt or screw the same size and with a file (use a triangular file or the corner of a square) cut a groove perpendicular to the threads. Use this for threading.

I have even just forced the bolt into a slightly smaller hole, but this tend to provide a little to much tightness for some applications.

Worst case you find out the wood will not hold (this has never happened to me) and you add an insert. Give it a try and let me know what you think.

Hope it helps
dw

-- Master hand plane hoarder. - http://timetestedtools.com



4 comments so far

View RGtools's profile

RGtools

3302 posts in 1256 days


#1 posted 1121 days ago

I like the “insta tap” trick, that’s pretty cool.

-- Make furniture that lasts as long as the tree - Ryan

View Bluepine38's profile

Bluepine38

2876 posts in 1686 days


#2 posted 1120 days ago

Good idea on the tap, I find that it works better if you file 3 or 4 equally spaced notches in the bolt. I know
what you mean about not having an insert, so before I retired from my job at the Fasteners store, I ordered
about 100 of each size I might need so I would have them when i needed them, but I am still trying to
master the cutting of wooden threads, no hurry, have plenty of time now.

-- As ever, Gus-the 75 yr young apprentice carpenter

View ChuckM's profile

ChuckM

496 posts in 2268 days


#3 posted 1119 days ago

For a recent project (http://lumberjocks.com/projects/50055 ), I used one of these: http://www.leevalley.com/en/hardware/page.aspx?p=65133&cat=3,41306

-- The time I enjoy wasting is not time wasted

View WayneC's profile

WayneC

12255 posts in 2698 days


#4 posted 1119 days ago

Those are really nice Chuck.

-- We must guard our enthusiasm as we would our life - James Krenov

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