Speeds & feeds
Enter your tooling supplier’s cutting data and the permitted RPM for your setup. Example inputs are not cutting recommendations.
Formula & setup notes
RPM = 12 × SFM ÷ (π × diameter in inches), or 1000 × m/min ÷ (π × diameter in mm). Linear feed = RPM × feed/revolution. The displayed feed uses the capped RPM. The cap here does not configure your machine. For constant surface speed, verify the control’s spindle limit and your workholding rating, especially near center.
Drill & tap lookup
Selected common cutting-tap sizes. Inch chart: approximately 75% thread; metric chart: 77% per Haas. These are reference drill diameters, not a guarantee of fit or thread engagement.
| Thread | Series | Drill | Inches | Millimeters |
|---|
For forming taps, hole size depends on material and required engagement. Use the tap manufacturer’s specification; cutting-tap drill sizes are intentionally hidden in forming mode. No pipe-thread sizes are included.
Taper calculator
Diameters and axial taper length. Half-angle is measured from the centerline.
Formulas
Diameter taper per unit length = (D − d) / L. Taper per foot = 12 × (D − d) / L when dimensions are inches. Half-angle = atan((D − d) / (2L)); included angle is twice the half-angle. Diagram is illustrative, not a manufacturing drawing.
Shaft & bore fit
Use limits from the drawing. This compares dimensional extremes; it does not assign an ISO or ANSI fit class.
How to read the result
Minimum clearance = minimum bore − maximum shaft. Maximum clearance = maximum bore − minimum shaft. Negative clearance means interference. Values assume the same reference temperature and exclude geometry, surface finish, measurement uncertainty, and thermal effects.
Inches, fractions & millimeters
Fraction approximation rounds to the nearest 1/64 inch and reports the rounding difference. Exact decimal output is the primary reference.