中文（繁體字）
English (international)Definition of Mill Drill Power Feed
Geared head mill drills may also offer automatic quill down-feed, engaged through a worm drive at fixed feeds per spindle revolution, typically between 0.1 and 0.4mm per revolution. A power feed delivers a constant chip load along the cut, which gives a more uniform surface finish, extends tool life and reduces operator fatigue on long milling passes. It is supplied either as a factory option or as a retrofit.
Why it Matters for Band Saw and Mill Drill Machines
Consistent feed also protects the machine. Sudden surges in hand feeding put shock loads on the spindle bearings and leadscrew, and on a lighter machine they can start chatter that marks the work. A steady feed keeps cutting forces within the rigidity limits of the column and head. Heavier machines often add automatic quill down-feed as well; our RF-500S heavy duty mill drill offers four rates between 0.1 and 0.4mm per revolution.
The limit stops should be set and checked before each job, so the table cannot run into the vise jaws or past the end of its travel. The drive gear and leadscrew should be kept clean and lubricated, and the table gibs adjusted so the motor is not working against unnecessary drag, which shortens the life of both motor and gears.
FAQ
What does a Mill Drill Machine power feed add to everyday milling and drilling work?
A Mill Drill Machine power feed adds three things that manual feeding cannot reliably provide. The first is a constant feed rate, which keeps chip load uniform and produces an even surface finish on long passes. The second is repeatability: once the feed rate and limit stops are set, every part in a batch is machined under the same conditions, which simplifies size control and tool life prediction. The third is a lighter operator workload, since the operator can watch the cut, apply coolant and check for chip packing instead of turning a handwheel. Rapid traverse also shortens non-cutting moves between features. On geared head machines with automatic quill down-feed, the same benefits apply to drilling and boring.
How should the feed rate be set on a Mill Drill Machine power feed for steel and aluminum?
Feed rate on a Mill Drill Machine power feed is calculated from spindle speed, number of flutes and recommended feed per tooth. For a 12mm three-flute carbide end mill in aluminum at 2,000 revolutions per minute (RPM) and 0.05mm per tooth, the table feed is 2,000 x 3 x 0.05, or 300mm per minute. In mild steel, the same tool might run at 900 RPM and 0.03mm per tooth, giving about 80mm per minute. As many power feed dials are not calibrated in millimeters per minute, you should confirm the actual rate against the digital readout or a timed movement. We would suggest starting conservatively and increasing the feed gradually, as our milling speed and feed guide explains.
Why does a Mill Drill Machine power feed stall or slow down under cutting load?
Stalling on a Mill Drill Machine power feed usually means the drive is meeting more resistance than its motor can overcome. Common causes are table gibs set too tight, a dry or chip-contaminated leadscrew, and a depth of cut or feed rate that is excessive for the tool and material. Worn or misaligned gears between the unit and the leadscrew can also slip under load. To check, disengage the power feed and turn the handwheel through full travel: tight spots point to gib or leadscrew problems. If the table moves freely by hand, reduce the radial engagement or feed, then inspect the clutch, gears and power supply. Persistent slowing may also indicate a failing motor or speed control board.
