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Forum topic by Cantputjamontoast posted 01-25-2009 02:50 AM 1646 views 0 times favorited 2 replies Add to Favorites Watch
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Cantputjamontoast

416 posts in 3341 days


01-25-2009 02:50 AM

Topic tags/keywords: drill-driver question

Trying to clean the chuck on a small egbeater drill.

I have unscrewed the chuck from the shaft but cannot get the chuck apart.
Are these things reversed threaded for some reason?

-- "Not skilled enough to wipe jam on toast!"


2 replies so far

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Cantputjamontoast

416 posts in 3341 days


#1 posted 01-25-2009 05:23 PM

I found the answer.

Tuning an Eggbeater Drill so it ‘Spins Real Good’
by Andy Seaman 2 of 3

Here I’ve cracked open the chuck and you can see the shiny nickel plating that hasn’t seen the light of day since it was assembled some time ago in Greenfield, Mass. These are right-hand threads mind you, so you’ll want to turn the chuck cap counter-clockwise to loosen (anti-clockwise, Jeff). These threads need to be right-handed because you want them to tighten during normal use, i.e. drilling clockwise.

I remove the guts of the chuck being careful not to scratch the smooth inside surface of the chuck shell that the jaws slide on. From left to right we have the chuck shell, jaws, thrust washer, and chuck cap. This chuck design is pretty common, but there is some variation amongst the different makers. Here’s a quick look at some different chucks that I have.

From L to R, North Bros. 1430A, Stanley POS Defiance Something or Other, MF #5, MF #120A breast drill. The North Bros. chuck is the easiest to get into since it has wrench flats for an open-end wrench (spanner, Jeff). The others are most easily opened with pliers, strap wrenches, vise grips, etc.

The following photo shows the internals of the MF #120A breast drill chuck. This is another common chuck design and is also used in North Bros. drills. Thought I’d include a photo of this style just in case you need it for reference.

Ok, back to the matter at hand. The inside of the chuck shell is coated with some schmoo that’s been softened by the WD-40. I suspect that the MF assemblers lubricated the chucks with lithium grease, a lubricant that’s notorious for drying out over time. Add to that decades of metal chips, sawdust, and storage dust and now we’re beginning to understand why the chuck sticks.

But I’ve seen and fixed a lot worse. That chuck from the Stanley Defiance was so rusty it was pitted on the inside – but now it works like buttah. I wipe out the inside of the chuck shell with a rag. My intention is to remove as much of that schmoo as I can in about five seconds. Now we move on to my technically advanced chuck-cleaner-outer (patent pending) available for three easy payments of $19.95 plus S+H.

Yep, a dowel with a wide saw kerf will hold a piece of non-woven abrasive pad wonderfully. I use ½” dowel to stiffen things up. Jam the piece of Scotchbrite into the kerf and chuck the dowel in a breast drill. I put the chuck shell back in my vise and insert the end of the chuck-cleaner-outer so that the Scotchbrite kinda folds over onto itself. Then I spin this gizmo as fast as I can for about 30 seconds, angling the breast drill all over the place to polish the entire inside surface. There, now check the result.

Looks pretty good, eh? The tapered surface is smooth and polished. If your chuck shell isn’t in good shape like this one then just keep working it with the Scotchbrite. Use coarser grades if necessary but make certain to finish with finer stuff. Now let’s take a peek at the cleaned-up jaws.

These are also in pretty good shape. We’re primarily concerned with the tapered round surface that is in contact with the inside of the chuck shell. Make sure these surfaces are smooth and burr-free. I touched up the corners of mine on a fine India stone for good measure. When I’m ready to put the chuck back together I put a small amount of synthetic grease inside the chuck shell where the jaws will slide, clean and grease the male threads of the chuck cap, and apply a touch of grease to the tip of the spindle threads.

Less is more here, so take it easy with that grease!

-- "Not skilled enough to wipe jam on toast!"

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motthunter

2142 posts in 3708 days


#2 posted 01-25-2009 05:33 PM

always good to answer your own questions

-- making sawdust....

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