If I had to guess, I'd say that they thread into a ring bored to fit
over the chuck, and far end of each is dog-pointed to fit the chuck
key holes. (Nose of the chuck looks big to me).
How'd I do, Iggy?
On Fri, 23 Mar 2007 21:28:55 -0500, with neither quill nor qualm,
I'll bet things liven up in there when you accidentally turn the
machine on after forgetting to remove one or more of the handles.
Glenn's idea would be a good one if it didn't mean that the threads
which went through the ring would be battered by the movement against
the chuck each time, but a manual tapping machine has oh-so much extra
room around it. The drill press method seems far too cramped to me.
Have you read the new book "What Would Machiavelli Do?"
On 24 Mar 2007 02:17:49 GMT, email@example.com (DoN. Nichols)
===============It is easy to get too elaborate on these types of projects.
The easy way is to make a wrench from 2 pieces of 5/8 or 3/4
square stock that pinches the chuck. No great amount of strength
is needed. One of the wrench handles should have a pin,
setscrew, headless cap screws, etc. loctited that is a pretty
close fit to the key holes in the chuck. In use this pin goes
into one of the key holes and the two clamp screws are tightened
to retain the wrench. For ease in use I suggest thumbscrews.
Generally the handles should be as long as will allow the wrench
to clear the column, although this makes it easier to twist off
In the larger sizes you may find there is a tendency of the tap
to "spin" in the chuck after the first turn or two. This is
generally no problem, as the tap is started after two turns and
you can use a regular tap wrench.
Unka' George [George McDuffee]
Watch out w'en you'er gittin all you want.
Fattenin' hogs ain't in luck.
Joel Chandler Harris (1848-1908), U.S. journalist.
Uncle Remus: His Songs and His Sayings,
"Plantation Proverbs" (1880).
Bench-type drill presses are fairly easily converted for tapping by
fabricating a removable crank that fits the top of the spindle.
I've modified a light duty benchtop Ryobi to accept a removable crank, and
disengage the quill return spring when used to tap holes.
For the issue of taps slipping in a drill chuck, three flats can be ground
into the shanks of a handful of taps fairly quickly. The flats don't need to
be deep, but should be equal in depth and separation. By maintaining the
square end, the taps can still be used with the usual tap handles. A mounted
stone and a Dremel will work well, and an indexer can be used if desired.
If the flats aren't somewhat accurate, the tap will have runout, and
increase the chances of breakage.
Here's an example of a cheap drill press converted to a tapping fixture
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