# CNC Speeds & Feeds Calculator — Machinist Tap Drill, Chip Load

> Machinist Tap Drill, Chip Load (iPhone/iPad app by heekyung moon.)

- Source: https://appshunter.io/ios/app/cnc-speeds-and-feeds-calculator/id6790015946 (this page in markdown: same URL + `.md`)
- Developer: [heekyung moon](https://appshunter.io/developer/6779193748)
- Category: Utilities, Productivity
- Price: Free
- Age rating: 17+
- Requires: iOS 16.4 · 50 MB
- Languages: American English
- Released: 2026-07-20
- Data updated: 2026-10-25

## What is CNC Speeds & Feeds Calculator?

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.

## Is CNC Speeds & Feeds Calculator safe?

Not enough ratings yet to assess CNC Speeds & Feeds Calculator.

## Is CNC Speeds & Feeds Calculator legit?

CNC Speeds & Feeds Calculator appears legitimate, with a few gaps. The AppsHunter Legitimacy Score for CNC Speeds & Feeds Calculator is 65 out of 100 points across 7 verification signals from App Store and developer data.


## Version history (last 5 releases)

### 1.3.9 — 2026-10-21

• The “Speeds” tab gains a bar beneath the title displaying RPM and Feed (mm/min or in/min). It remains at the top as you scroll and whilst the keyboard is open, keeping the figures in view as you type.
• Its figures are the same ones shown in the result card below, and they update together with every edit.
• While a blank field is taking a suggested starting value, “Suggested start” appears in the bar as well.
• The calculations themselves are unchanged.

### 1.3.7 — 2026-09-24

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.

### 1.3.6 — 2026-09-05

Turning surface-finish calculator on the Reference tab, under the taper card.
Verify: open Reference, scroll past Taper calculator to Turning surface finish. Leave mm selected. Mode Ra from feed. Enter feed 0.2 and nose 0.8 (or tap the 0.8 chip). Ra shows 1.563 µm and Rt 6.250 µm. Switch to Feed for Ra, enter target 1.6 with the same nose — max feed is 0.202 mm/rev. Caption states this is theoretical; real finish is typically 1.5–3× rougher. Feed at or above 2× nose radius blanks the numbers.

### 1.3.3 — 2026-08-06

Alerts now arrive properly on Android instead of landing silently, and the app no longer interrupts you in the middle of what you came to do.

### 1.3.1 — 2026-08-03

Performance improvements, bug fixes, and refinements for the latest iOS.

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All apps by heekyung moon: https://appshunter.io/developer/6779193748

## Related topics

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*Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-10-25.*