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iMachining is an iPhone App designed for machinists, technicians, engineers and student to be used as a machining calculator and also a reference tool for drilling, milling and turning (lathe). It is designed to be very easy-to-use and user-friendly at shops.


*** Turning (Lathe) ***
- Calculate RPM given Cutting Speed and Cutting Diameter
- Calculate Cutting Speed given RPM and Cutting Diameter
- Calculate Machining Time given Cutting Length, RPM and Feed/Turn
- Metric and Imperial units (mm, inch)

*** Milling ***
- Calculate RPM given the Cutting Speed and Tool Diameter
- Calculate Tool Feed Rate given Feed/Tooth, Tool Diameter and number of tool teeth
- Calculate Machining Time given the Feed and Cutting Length
- Metric and Imperial units (mm, inch)

*** Drilling ***
- Find RPM given the Cutting Speed and Tool Diameter
- Find Feed Rate given the Cutting Feed (inch/rev) and RPM
- Find Machining Time given the cut length and feed rate
- Metric and Imperial units (mm, inch)

*** Reference Tool: Tap Size Charts ***
- Interactive tap size charts
- Fractional, Screw Size and Metric Standards
- Coarse and Fine threads

*** Reference Tool: Drill Size Charts ***
- Interactive drill size chart
- Fractional, Letter, Wire Gauge and Metric Standards
- Drill Size in mm and inches

*** Reference Tool: Machining Parameters ***
- Interactive machining parameter charts for cutting speed and feed rates for different materials
- Machining parameters for different tool materials: HSS and Carbide
- Feed rates for milling and turning
- Selection between Metric and Imperial units

What’s New

Version 1.21

- Fixed Machining Time in Metric for Milling
- Fixed Cut Time Display for Drilling

Ratings and Reviews

3.0 out of 5
1 Rating

1 Rating

A154James ,

$5 and still ads

The app itself is amazing and it does everything I need it to. It is just really annoying having to pay $5 for an app with a permanent ad at the bottom, that's why it's 3 stars not 5.

HottRODder ,

Looks nice, not much info though

To the Developer: I hate to slam any of these apps that try to educate Machinists, but please go back and review what information you have put into this app.

Although this app has some nice pictures and explains how to use each area, the fields you need to populate are cluttered on the screen due to the graphics. Most apps similar to this don't need to have explanations as they are self-explanatory. I do like how one answer leads into the next question.

The Machining Parameters section is vague. Take for instance the Stainless Steel Section. There are several types of Stainless Steels and the proper SFM can vary quite a bit depending upon material hardness as well as which coating and carbide substrate is used, thus the reason why other apps probably don't include this detail and mislead someone unless provided by a tool manufacturer promoting their own product. The Turning Feed section should have some correlation between Depth of Cut and type of Tool Nose Radius at the least. The Milling Feed section needs to take into consideration Diameter of Tool and the Depth of Cut and available Horsepower. I wouldn't try those feedrates on Stainless or Alloy Steels unless I had my hand on the Big Red Button.

The Tap Drill Sizes are based off of older Drill Charts. Beware as the percentage of threads these suggest can cause problems with tap breakage or sloppy gaging. I prefer it when you can calculate the Minor Diameter Hole Size by the percentage of thread you wish for the fit you are after.

Nice start, I'm sure to use it at times. But there are other apps that still are much more accurate, user friendly and not cluttered.

Reality World ,


Really useful App… The best of its kind that o have ever seen. Very easy to use with very useful reference tables that usually I need them in the shop… I love having my phone as a tool at my work..
Feedback: It would be nice if you add more speed and rate data for other materials ..


Motionics, LLC
28.4 MB

Requires iOS 6.0 or later. Compatible with iPhone, iPad, and iPod touch.



Age Rating


  • Family Sharing

    With Family Sharing set up, up to six family members can use this app.

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