Ask ten machinists how they picked a feed rate and you will get ten different answers, but the honest ones usually come back to the same small piece of arithmetic. The chip load formula ties spindle ...

Walk into any machine shop and ask two machinists whether cobalt or carbide drill bits are "better", and you will usually get two confident, completely opposite answers. Both of them are right, and t...

Ask any machinist who has heard that unmistakable squeal when a cutter is pushed straight into a pocket, and you will get a quick answer about tool geometry. A center cutting end mill is the tool tha...

Drilling is usually the first operation that teaches a machinist respect for cutting data. Feed a carbide drill too gently and it rubs, work-hardens the surface and dulls within a few holes. Push it ...

Ask any machinist about drilling hardened steel and the same stories come back: a glowing drill tip, a squealing spindle, and a hole that refuses to grow. Tool steel at 50 HRC and above behaves less ...

Ask ten machinists to describe a bull nose end mill and you will hear ten versions of the same idea: a flat-bottomed cutter with a small radius ground into the corners where the bottom cutting edge m...

Ask any mold maker or toolroom hand which cutter spends the most hours in the spindle, and the answer is usually the same: a ball nose end mill. Its rounded tip is the only geometry that follows the ...

Aluminum has a reputation as an easy material, and most of the time it earns that reputation. It cuts fast, it pulls heat away from the cutting edge quickly, and it rarely demands the cautious approa...

When a size 3 center drill comes up in the tool crib, the numbers on the label can be confusing. The dimensions that matter most are the body diameter, the pilot drill diameter, and the overall lengt...