The Original "Cordless" Drills

[RTM]

dang, thought I replied the other morning, guess it got lost in hell.

Mine is just a plain set screw, screwing directly to the shaft visible thru the hole. I believe the shaft is split above and below the bearing. When the top shaft is locked, the quill is extended by unthreading from the bearing. But that would imply losing the flywheel effect, which does not seem right.




Looking at yours, I’d assume the quill advances by extending out the fine thread, which I’m guessing might even be 2x the coarse thread.

 

[Old tool guy]

The fine thread is only there for the chuck to screw on. It’s the style where, as you screw the chuck on further it pushes the fingers out to grip the bit.

 

[RTM]

Instill don’t understand how the self feed works, maybe it will become evident when it’s all assembled and moving easily.

Ok, since I've never had mine apart, I'm assuming your coarse thread on the shaft screws into the hollow shaft sticking out of the flywheel. And the spring on the locking screw rides in the groove on the hollow shaft. You need to thread the dual thread shaft all the way up into the flywheel to start. When you want it to self feed, tighten the screw, and stop the flywheel. Then, as you continue to crank, the shaft will unscrew from the hollow shaft on the flywheel. I think you need to crank it backwards to retract the quill.

My thought of a split shaft earlier might actually be the same as yours, a hollow shaft at the outlet end.

I assume to drill without the auto feed, you might just loosen the screw that holds the head on the shaft, and let gravity win.

 

[four.cycle]

Wow.... I guess I have some reading to do here. This is the first time I've looked at this thread.
For reasons I still don't understand, I acquired about half a dozen of these about a year ago - Stanley, Millers Falls, etc.
They're all in a box in the garage waiting for me to get to them.

 

[Old tool guy]

Ok, since I've never had mine apart, I'm assuming your coarse thread on the shaft screws into the hollow shaft sticking out of the flywheel. YES

And the spring on the locking screw rides in the groove on the hollow shaft. Could be, it lines up that way. Probably a ball bearing, not the bare spring.
You need to thread the dual thread shaft all the way up into the flywheel to start. When you want it to self feed, tighten the screw, and stop the flywheel. Then, as you continue to crank, the shaft will unscrew from the hollow shaft on the flywheel. I think you need to crank it backwards to retract the quill.

My thought of a split shaft earlier might actually be the same as yours, a hollow shaft at the outlet end.

I assume to drill without the auto feed, you might just loosen the screw that holds the head on the shaft, and let gravity win.

Appreciate your comments, getting close to final assembly.
Here’s an interesting detail, looks like an oil port to drip oil on the ball bearings and maybe the shaft. But it sure is tucked up high under the flywheel. Sure wish the manufacturer had a website …
.

 

[Old tool guy]

Got it! I guess if i was a decent guy i would post a short video.
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So here's the deal. If the set screw under the flywheel is loose, the flywheel turns with the shaft and crank, providing some inertia. Not sure what the purpose is, unless you had a burr or wire brush or something you wanted to spin, and hold material against it. I put a 1/4” ball bearing at the end of the spring which will get pressed against the extended shaft of the flywheel. When you tighten the set screw, it applies enough pressure to prevent the flywheel from turning, and then the coarse threads at the top of the shaft ride up & down the internal threads of the flywheel, causing the quill to rise and fall (depending on which way you are turning the crank).
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Maybe you would loosen the setscrew, get the quill up to speed, tighten the setcscrew to lower the bit into the material with some speed and inertia.

 

[Old tool guy]

Chucked a bit into it and started playing around, found an interesting feature. Leave the set screw loose, crank the handle to get up a little speed, then use your hand to slow the flywheel. That causes the quill to start lowering into the wood or part to be drilled. If the drill bogs down, let go of the flywheel, stops advancing the bit, regain some speed.

 

[59Sled]

2 more drills I finished up restoring.

Dunlap


Looks like a Defiance but has no markings.