CNC Speeds & Feeds Calculator
Machinist Tap Drill, Chip Load
Only for iPhone
Free · Designed for iPhone. Not verified for macOS.
iPhone
Open Speeds & Feeds and the RPM and feed rate are already there: blank fields now use a starting chip load kept at or below a published slotting chart.
Speeds and feeds for CNC milling in one tap: pick a material and HSS or carbide, and the spindle RPM and feed rate appear straight away. Tap drill, bolt circle, taper and turning surface finish sit alongside, so the numbers a machinist reaches for all day are in one shop app that works offline, in inches or millimetres.
▶ SPEEDS & FEEDS
• 8 workpiece materials: aluminum, brass, mild steel, alloy steel, stainless 304, cast iron, titanium and plastic
• HSS or carbide tooling, with the starting cutting speed shown in SFM or m/min
• Enter tool diameter, flute count and chip load (feed per tooth) to read spindle RPM and table feed in in/min or mm/min
• Leave a field blank and the app fills in a starting value: a 10 mm (0.375 in) tool, 4 flutes and a suggested chip load kept at or below a published carbide end-mill slotting chart, so you see a result the moment you open it. Type your own numbers and they replace the suggestions
• End-mill diagram shows the flute count and chip load per tooth for the setup on screen
• Save up to 50 named presets and reload a whole setup in one tap
▶ TAP DRILL
• Metric (20 sizes) and Unified UNC/UNF (33 sizes) threads
• Thread engagement from 50% to 85% in 5% steps, 75% as the shop default
• Theoretical tap-drill size plus the nearest standard drill
▶ BOLT CIRCLE
• Hole count, circle diameter, start angle and centre X/Y give the X/Y coordinates of every hole, drawn to scale
• Tap a row to copy its coordinates, or copy the whole table for the control
▶ TAPER & TURNING
• Taper from two diameters and a length, or from an included angle, taper per foot or a 1:N ratio: compound-rest half-angle, included angle, taper per foot and per inch, in decimal degrees and degrees-minutes-seconds
• Turning surface finish: theoretical Ra and Rt from feed per rev and nose radius, or the maximum feed for a target Ra
▶ REFERENCE
• Cutting speed table by material for HSS and carbide
• Drill size chart with 243 number, letter, fractional and metric sizes, searchable
• Thread pitch and minor diameters, drill point depth and typical surface-finish ranges
All values are conservative starting points from published data, not guarantees. Always check against your tooling, machine and setup, start slow and increase.
Ratings & Reviews
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Speeds & Feeds now shows a result the moment you open it: blank fields use a 10 mm (0.375 in) tool, 4 flutes and a suggested chip load kept at or below a published carbide end-mill slotting chart, and anything you type replaces them. A new end-mill diagram shows the flute count and chip load per tooth, the result numbers are larger, and the app now fully speaks Czech, Danish, Finnish, Hebrew and Dutch.
The developer, heekyung moon, indicated that the app’s privacy practices may include handling of data as described below. For more information, see the developer’s privacy policy .
Data Used to Track You
The following data may be used to track you across apps and websites owned by other companies:
- Identifiers
- Usage Data
Data Not Linked to You
The following data may be collected but it is not linked to your identity:
- Identifiers
- Usage Data
- Diagnostics
Accessibility
The developer has not yet indicated which accessibility features this app supports. Learn More
Information
- Seller
- heekyung moon
- Size
- 52.8 MB
- Category
- Utilities
- Compatibility
Requires iOS 16.4 or later.
- iPhone
Requires iOS 16.4 or later. - Mac
Requires macOS 12.0 or later and a Mac with Apple M1 chip or later. - Apple Vision
Requires visionOS 1.0 or later.
- iPhone
- Languages
- English
- Age Rating
18+
- 18+
- Contains
Advertising
- Copyright
- © 2026 Moon