iPhone Screenshots


An important tool to have in every machinist's hand.

The app includes a lot of information and calculations required in every day shop use.

Tapping, drill sizes, feeds speeds for various materials including roll form taps.
Three-Wire Thread Measurement including Buckingham Involute Helicoid Formula (Exact Formula) found nowhere else.
Combination Drill & Countersink depth calculator from #00 through #10 sizes.
Spot Drill Depths for various tool angles.
Chart of Collet types, sizes used in CNC Milling holders ordered from best to worst.
Cusp height calculation for ball nose end mills with RMS values.
SFM to RPM and vise versa based on cutter diameter.
Sine Bar / Sine Plate calculation.
Gage Block Stack Height List, can be used with the sine bar calculator.
Bolt Circles with X Y coordinates.
Right Triangle solver.
Cubic and square roots
Material Hardness
Material Machinability
Heat Treat Growth
Weight of basic shapes (angle, rectangle, hex, round, pipe, tube) per material and length, good for planning and quoting.
Plating and Anodizing specifications with size change for build up.
Schedule Pipe sizes.
Sheet Metal Gages.
Thermal Expansion of materials.
Chamfer Mill calculator to achieve desired chamfer size.
Reamer Drill Size
Basic screw dimensions and clearances. Flathead, shoulder bolts, low head and standard socket head.

What’s New

Version 2.1.1

Improved readability on some screens where text did not fit.

Ratings and Reviews

1.0 out of 5
1 Rating

1 Rating

geehyker ,

Does what is claims.

This app does exactly what is claimed. I use it almost daily and it easily pays for itself everytime. This is not the machinery handbook but is full of handy calculators. I wish it had end mill feed and speeds, otherwise real good tool.

Fizhman ,

It's not what it seems.

Well this app get some good information to help out the general machinist. It doesn't live up to the idea of the machinist handbook you need to really expand upon it forward to be worth the 30 some dollars we spend on it.


Kirk Mahr
2.6 MB

Requires iOS 8.0 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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