Throat Drilling

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Seeing Taydins post about his microscope set up reminded me of an old lad here that hammered saws for years.

He had taken his drill press apart, and turned the column and base upside down and bolted it to a sturdy beam on the ceiling of his shop.

Then reinstalled the head on the column so he had a maximum swing of any diameter.

It was an interesting concept when i first saw it years ago.

Interesting, but how did he keep the table perpendicular to the spindle of the drill? Maybe he wasn't worried about how straight the holes were.

Would there have been an attached table in such a configuration?

.

I'm guessing the head is mounted on the ceiling and the table is mounted on the floor.

As long as the column is plumb and the table level, it is good to go.
Great Idea.

Seeing Taydins post about his microscope set up reminded me of an old lad here that hammered saws for years.

He had taken his drill press apart, and turned the column and base upside down and bolted it to a sturdy beam on the ceiling of his shop.

Then reinstalled the head on the column so he had a maximum swing of any diameter.

It was an interesting concept when i first saw it years ago.
Paul A.
SE Texas

And if you look REAL close at an analog signal,
You will find that it has discrete steps.

The drill press was an old Delta, one of the heavier ones, i can't remember if he had any braces? on the column or not.

The table was a large hardwood framed one maybe waist high , and it would be about 4ft square.

Don't think there was any ridgity problem, as far as i know he was only drilling through maybe 1/4 inch or so, and the largest saw blade i ever saw there was maybe 6ft in diameter.

Neat old guy with a reputation for very accurate saw blade work, he used have the little wooden boxes that saw teeth inserts came in bundled up by the dozen he sold to the public, i still have 60 of those boxes i built into a cabinet , used them for small parts drawers.

I bought a small drill press once to convert to a horizontal boring machine. I used the original column but modified the head so it would slide up or down the column, and could be locked in whatever position. Then I made up a pair of mounts to add this column to a larger one. The mounts basically look like connecting rods. The small ends are where the dp column goes into, and the large ends are what go over the larger column. The length of the 'connecting rods' are what determine what the new depth of throat will be. I went from about 5 inches to about 12 inches dot.

The head can be slid down the original column till it touches the lower mount. That puts the chuck below the mount, so the extra space is available with nothing in the way. The head can also be rotated on the column- more on this later.

The setup is very rigid because both ends of the original column are being securely held to the new, larger column. It doesn't rely as much on the stiffness of the original column to keep it rigid- that job is transferred to the larger column.

In this case the larger column is a piece of square steel tubing. As I usually do in cases like this, I carefully selected the length of tubing to be as straight as possible, with no 'transitional bumps' in it like you sometimes find in lengths of steel. Other than that, it is not prepared or machined in any way except for drilling mounting holes, etc.

This machine is used horizontally, so it resembles a lathe now more than a drill press. In this case, the 'headstock spindle' is movable (the original downfeed is unaltered) like on a Unimat, and where a table assembly normally would be, instead it's more of a carriage straddling the larger column. There are two of these carriages- one gets moved to the right to support the workpiece 'out there', and the other gets moved close to the chuck.

The height of these carriages is such that you can lay a workpiece across them, then adjust the rotation of the head on the small column to set the point at which you can drill into the end of the workpiece. With this machine I can end-drill anything of a length limited only by the width of the shop. Really long stuff needs extra outboard supports, or course.

I seldom do anything within the scope of logical reason and calculated cost/benefit, etc- I'm following my pass ion-

Walker-Turner sold lots of custom drill setups back in the 1940s. In addition to the standard gang of 2 or more drills on a bench they did setup that hung a W-T drill head from a trolley on an I beam. The setup had a crank on the side to elevate the head using a rack on the side of the column.

Yep, that would work pretty well on thin stuff.

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Servo Elbow & Deep Throat Drill Press, Chuck Spindle, 457mm Column - 7140-M
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Servo Elbow & Deep Throat Drill Press, Chuck Spindle, 457mm Column - 7140-M
For laboratory, prototype and precision production work. For larger work pieces. Available in chuck and collet models with inch or metric calibration.
I=Inch; M=Metric [ ] = See drawings
Maximum distance of chuck/collet to base[a]
Throat depth [b] (spindle CL to column)
Fly-cut cast aluminum base with fine grain cast iron offset and elbow

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