Feeds, speeds and cutting load
Use the dedicated feed-and-speed calculator for milling, turning and drilling. Supporting tools cover surface speed, tapping synchronization, chip thinning, material removal, power and spindle torque.
WRKDOCS · MANUFACTURING CALCULATION LIBRARY
CNC Calculator Toolbox
Practical calculators for milling, turning, drilling, tapping, machining geometry and shop-floor planning. Search the library, choose a tool and enter your own process data. Every calculation runs in your browser.
SELECTED CALCULATOR
Spindle RPM & Surface Speed
Convert cutting speed and tool or workpiece diameter into spindle RPM, including an optional machine speed ceiling.
Enter your process values, then calculate.
Threading, holes and drill geometry
Estimate cut-tap drill sizes, thread engagement, drill-point depth, countersink depth and peck-cycle time. Standards, tap type and hole conditions still need to be checked against the drawing and tool maker.
Milling, turning and coordinates
Estimate ball-nose cusp height, ideal turning roughness, tool deflection, lathe taper geometry, helical ramp angle, PCD coordinates and polar XY positions.
Machining safety: These calculators perform defined mathematical estimates. They do not choose safe cutting data for a material or tool, validate a CNC program, or know your machine’s power curve, control cycle, workholding, tool condition, coolant or collision envelope. Use current tool-manufacturer data and approved process sheets. Verify units, work offsets, clearances and machine limits before running a program.
About the CNC calculators
Does WRKDOCS recommend cutting speeds for every material?
No. Cutting speeds, feeds, chip load and specific cutting force depend on the cutter, substrate, coating, work material, hardness, engagement, coolant, rigidity and machine. Enter approved values from the tooling supplier or process engineer rather than relying on generic presets.
Can I use metric and imperial units?
Most calculators provide metric and imperial inputs. The calculator labels specify the expected unit for each field. Check the displayed unit next to every result before transferring a value to the machine.
Are thread and tap-drill sizes standards-certified?
No. The tap-drill tool estimates a theoretical pre-hole for 60-degree cut taps using the entered basic diameter, pitch or TPI and target engagement. It does not apply every thread class, tolerance, material allowance, drill oversize or form-tap requirement. Confirm dimensions with the applicable ISO or ASME standard, tap maker’s chart and a thread gauge.
Does the cycle-time tool simulate a Fanuc, Siemens or Haas controller?
No. Basic time tools estimate cutting movement and user-entered dwell or retract travel. Controller-specific peck drilling, rigid tapping, acceleration, rapid motion and canned-cycle behavior require a machine-specific model.
Can I export or run the coordinates as CNC code?
The bolt-circle and polar conversion tools report theoretical coordinates only. They do not generate verified G-code. Check your control’s coordinate conventions, offsets, safe approach, fixture clearance and program simulation before machining.
Technical method references: Sandvik Coromant machining formulas · Tapmatic tapping formulas · Harvey Performance technical articles.