Delta 15-665 Drill Press Key Replacement: A Workshop Troubleshooting Guide
Lose the chuck key for a Delta 15-665 and the press is effectively idle, since you cannot open or close the jaws to change a bit. It sounds trivial, but the wrong replacement key rounds off in the chuck or will not turn at all, so matching the key to the chuck is the whole task. A Delta 15-665 drill press key replacement is quick to solve once you size the key to the chuck’s pinion, and a couple of habits keep you from losing the next one.
The chuck key is the geared tool that turns the chuck’s ring gear to open and close the jaws. Its fit is set by the pilot diameter (the round tip that centers in the chuck) and the gear pitch that meshes with the chuck teeth, so the key must match that specific chuck, not just the brand.
The direct answer: match a replacement key to your chuck’s pilot diameter and gear pitch, not to the press model, since the 15-665 could carry different chucks over its life. Read the size stamped on the chuck or measure the pilot hole, then fit the matching key.
Size the key to the chuck
The key matches the chuck, so start there with the press unplugged:
- Read the chuck markings. Many chucks stamp a capacity and a key number (like a K number) on the body. That number identifies the correct key.
- Measure the pilot hole if there are no markings. The round hole beside the ring gear sets the key’s pilot diameter.
- Check the gear pitch so the key teeth mesh cleanly with the chuck’s ring gear.
Match the key
With the size known, a matching drill press chuck key sized to your chuck restores use. A chuck key set covers the size if you are unsure between two, and a self ejecting chuck key adds a safety habit by springing out if left in the chuck.
Stop losing the next one
- Fit a self ejecting key so it cannot be left in the chuck and thrown at startup.
- Mount a chuck key holder on the column so the key has a home.
Where people go wrong
The first mistake is buying a key by the press model, when the 15-665 may wear different chucks and the key must match the chuck. The second is forcing a near fit key that rounds the chuck teeth or its own gear. The third is replacing a lost key with another standard key and losing that one too, instead of fitting a self ejecting key.
The verdict
Replacing a 15-665 chuck key is a five minute fix once you match the key to the chuck rather than the press. Read the chuck’s stamped key number or measure the pilot and pitch, then fit the matching key. Take the chance to fit a self ejecting key and a column holder so this is the last key you lose. Match the chuck, not the badge, and the press is back in service immediately, with a habit that keeps it that way.
Three takeaways:
- Match the key to the chuck’s pilot and pitch, not the press model.
- Read the chuck’s stamped key number or measure it.
- Fit a self ejecting key and a holder to stop losing keys.
FAQ
How do I find the right chuck key for a Delta 15-665? Match the key to your chuck, not the press. Read the key number stamped on the chuck or measure the pilot hole and gear pitch, then fit the matching key.
Why not just buy a key for the 15-665? The press may carry different chucks over its life, and the key must fit the chuck’s pilot and pitch. Sizing to the chuck avoids a key that rounds off or will not turn.
Where is the key size marked? Often stamped on the chuck body as a capacity and a key number (such as a K number). If there are no markings, measure the pilot hole beside the ring gear.
My new key slips or rounds off. Why? The pilot diameter or gear pitch does not match the chuck. Forcing a near fit damages the teeth. Match the key to the chuck’s exact size.
How do I stop losing the key? Fit a self ejecting key that springs out if left in the chuck, and mount a chuck key holder on the column so the key has a set place.
Is a self ejecting key worth it? Yes. It cannot be left in the chuck, so it will not be thrown at startup, and it removes the main way keys get lost.
Can I use a chuck key set? Yes. A set is useful when you are unsure between two sizes, letting you match the exact fit to your chuck.
References
- Occupational Safety and Health Administration, Woodworking eTool: Drill Presses. https://www.osha.gov/etools/woodworking/production/machines-tools/drill-press
- Canadian Centre for Occupational Health and Safety, Drill Presses. https://www.ccohs.ca/oshanswers/safety_haz/metalworking/drillpresses.html
