Understanding the Delta 12-Inch Drill Press 11 990: Setup, Limits, and Support

The Delta 12-inch drill press, model 11-990, is the machine a lot of woodworkers wish they had held onto. It is a benchtop press with genuine 12-inch reach and a smooth induction motor, the kind of tool that handles most home-shop drilling without fuss. It has been out of production for a while, so owning one today is less about buying new and more about setting one up correctly, working within its limits, and knowing where support still comes from. Understanding the Delta 11-990 on all three fronts is what turns a used find into a reliable shop fixture.

The Delta 11-990 is a 12-inch benchtop drill press with a 1/3 HP induction motor on 115V (about 6 amps), five spindle speeds (620, 1,100, 1,720, 2,340, and 3,100 RPM) set by a stepped-pulley belt, a 1/2-inch keyed chuck, and roughly 2-3/8 inches of spindle travel. The 12-inch swing reaches the center of a 12-inch board. It is discontinued, so support relies on archived manuals, used parts, and standard consumables.

Straight answer: set up correctly, the 11-990 is a capable, pleasant bench press for wood and light metal. Its limits, a 1/3 HP motor and a bit over 2 inches of quill travel, are fixed by the design, so plan your work around them rather than fighting them.

Setup, step by step

Assembly follows the standard Delta pattern, and doing it carefully pays off in accuracy:

1. Column to base: Bolt the column tube firmly to the cast base on a level bench.
2. Head onto column: Slide the head on, align it square to the table, and lock the setscrews.
3. Table and bracket: Fit the table bracket, set the height with the clamp, and confirm the table locks solidly.
4. Chuck: Clean the spindle taper and chuck bore (no oil), then seat the chuck with a firm tap.
5. Belt and speed: Set the belt on the pulley steps per the chart inside the cover, then tension it so it flexes slightly at the midpoint without slipping.

Once assembled, check that the quill returns smoothly under its spring and set the depth stop for repeatable holes.

Changing speed and choosing it

Speed changes are manual: lift the cover, loosen the belt tension, move the belt to the pulley step for your target RPM from the chart, and re-tension. Use the slower speeds (around 620 RPM) for larger bits and metal, and the faster ones (up to 3,100 RPM) for small bits in wood. Getting into the habit of matching speed to the bit is what keeps bits sharp and holes clean, and on a five-speed machine you can usually land close to ideal.

Limits, stated plainly

The 11-990 has two hard limits. The 1/3 HP motor is built for wood and light metal; a large hole saw or a wide bit in thick steel will bog it, so match the bit to the motor. And the roughly 2-3/8 inches of quill travel caps how deep you can drill in a single pull, so deep holes need staged plunges with the table or depth stop reset. These are not faults to repair; they are the boundaries of a 12-inch bench press, and good work stays inside them.

Support and parts

Because the machine is discontinued, keep the wear items fresh with standard parts. An aging V-belt is replaced by measuring the old loop and fitting the matching size. The 1/2-inch keyed chuck wears; a 5/8-inch keyed chuck with MT2 arbor replaces it after you confirm the spindle taper, and a lost key is a universal ratcheting chuck key. A drill press vise squares small parts on the table. Archived Delta manuals and community wikis document the 11-990’s assembly and speed chart, so upkeep is straightforward as long as the castings, quill, and pulleys are sound.

The honest flaws

Beyond the fixed limits, the honest note is support risk: with no factory warranty and no guaranteed structural spares, a failed casting or pulley can be hard to replace, so buy a complete, sound machine rather than a project. And the manual speed change, while simple, is less convenient than a modern variable-speed dial. Neither is a dealbreaker for a durable cast-iron press, but both are worth knowing going in.

Who should own one, and who should not

Own an 11-990 if you want 12-inch cast-iron capacity for wood and light metal, you have a complete running example, and you are comfortable with manual speed changes. It rewards careful setup with accurate, dependable drilling.

Skip it if you need heavy-steel power, deep single-pull holes, or the convenience of variable speed and factory support; a floor press or a current variable-speed benchtop machine fits better. Do not take on an incomplete 11-990 expecting to source its model-specific parts easily.

Conclusion: set it up well and respect its lane

The Delta 11-990 is a capable 12-inch bench press that pays back careful setup and realistic expectations.

• 12-inch swing, 1/3 HP induction motor, five speeds (620 to 3,100 RPM), 1/2-inch chuck, ~2-3/8-inch travel.
• Assemble squarely, tension the belt correctly, and match speed to the bit.
• The 1/3 HP motor and short travel are fixed limits; plan work around them.
• Keep consumables current; buy complete because structural parts are scarce.

FAQ

What size board does the 11-990 handle? Its 12-inch swing reaches the center of a 12-inch-wide board, more than Delta’s 8-inch bench presses.

How do I change speed on the 11-990? Lift the cover, release the belt tension, move the belt to the pulley step for your target RPM from the chart, and re-tension.

What are the speed settings? Five speeds: 620, 1,100, 1,720, 2,340, and 3,100 RPM.

How deep can it drill in one pass? Roughly 2-3/8 inches, limited by quill travel. Deeper holes need staged plunges.

What chuck does it use? A 1/2-inch keyed chuck. Confirm the spindle taper before fitting a replacement.

Can it drill steel? Light metal, yes. The 1/3 HP motor is not built for heavy steel or large-diameter bits.

Where do I find setup instructions? Archived Delta manuals and community wikis document the 11-990’s assembly and speed chart.

References

• Delta 11-990 12-inch Bench Drill Press Manual (PDF): https://www.mikestools.com/download/Delta_Drill_Press_Owners_Manuals/Delta_11-990.pdf
• Delta Drill Press owner’s manuals archive: https://www.mikestools.com/Delta-Drill-Press-Owners-Manuals
• Delta Machinery, manuals and parts support: https://www.deltamachinery.com/support/manuals