Knob replacemet

[Bob Vaughan]

So I busted a tightening knob on my dovetail jig. Nothing I had in stock or could find would fit adequately because of the needed dimensions. I’d seen the hole circle tried to make the outer grip lugs so I tried it and it really worked. I think next time I won’t sand the rim so aggressively but what I have works fine.

The 5/8” steel core was bored, tapped, and counter bored to fit the 3/8-16 thread. Next I ground slots around the core’s perimeter to hold the epoxy. The epoxy was mixed with fine sanding sawdust to fortify the hold.

It was a fun little project that makes having a wood lathe rather useful. I may make some other machine knobs like this in the future.

 

[Richard Coers]

When I got my Omnijig, the bottoms of the knobs were not perpendicular to the threaded insert. As I snugged up the knob, the comb would lift. I used all-thread and a couple of nuts to lock the knob on the rod. I put that in my drill press and lowered it down to some 80 grit on the drill press table. That machined the bottom of the knob and the problem was solved.

 

[Isaac Fisher]

Nicely done!

 

[Greg Carles]

Nice, how did you hold the knob on the lathe for turning it round?
Spur Drive? Chuck?

 

[henry dalton]

What a great idea. It turned out fabulous.

 

[john lucas]

When I do knobs like that I simply put a cut off bolt or all thread rod in the knob and then grip it with my drill chuck in the head stock. I have #2 morse taper collet system in different sizes for this type of application.

 

[Gerald Lawrence]

I use a Tee Nut for my knobs and only drill 4 holes a bit larger, I lie your design tho.