Tweaked SFIC/Finch Wrench

[l0ckcr4ck3r]

Got tired of the regular wrenches camming out, so had a think on what was happening. As the Wrench leans over in the keyway, the teeth on the regular style wrench lift out the holes slightly... and they are only 12-15 thousandths of an inch long to begin with. Also what makes it worse, is the only part of each tooth thats actually pushing on the sleeve are the 2 corners and they meet the side of the hole at around 60 degrees.. no surprise they keep jumping out!

So i had a go at fixing this and decided to cut the teeth as a half circle instead... this way the force is always meeting the side of the hole at 90 degrees... and the surface between the teeth is about a 10 degree slope down towards the back...no more Problems

[femurat]

WOW that's a brilliant solution! Thanks for sharing. It must be pretty tricky to make half rounded teeth with inclined sides. Did you use needle files or other tools? I guess you made them straight and then tapered them with a warding file.

Cheers

[l0ckcr4ck3r]

a 1/8" End mill, 1 tool pass, 3 minutes

[femurat]

Now I know how you made it so symmetric and uniformly spaced