Duncans Metal Pages
Last updated: 25 Nov 2022


Myford ML7 gear calculator

Download this neat utility which will let you work out changewheels for standard and non-standard pitches.


  • Works in TPI, inches/rev or mm/rev
  • Range setting, e.g. 7.999 to 8.001 TPI
  • Filtering to show only optimal solutions
  • All three setup configurations catered for
  • Add your own gears over and above the standard set
  • Help file included, complete with tutorial
  • Uninstaller included


  • Windows 2000 or higher, works with XP, Vista, Windows 7, Windows 8.1 etc.
  • RAM as for minimum operating system requirements
  • 256 colour display or better

Click here to download a .zip file containing the self-installing setup file, approx 1029k bytes - version 1.2 build 37 dated 30-Apr-2017.


Hobber gear calculator

For those who need to simply calculate ratios, then this is the thing.  Working on four gears, this utility will very rapidly calculate the required change wheels to get the ratio you require or very close to it.


  • Can optimise to suit change wheels you already have
  • Pick any ratio you like
  • Shows best solutions at the top of the list


  • Windows 95, 98, Me, XP, NT 4 (sp3 or higher), or Windows 2000
  • RAM as for minimum operating system requirements
  • 256 colour display or better

Click here to download the software, approx 190k bytes - Version 1.0 build 1 dated 19/4/2003.  Note that there is no installer or deinstaller, simply download to a folder and use it.  gear.exe does not alter your windows registry or add any system files, so when you want to get rid of it, simply delete the file.


These pages are maintained by Duncan Munro.  All content on this site is Copyright ©2002-2024 Duncan Amplification.
Warning: These pages consist of images and descriptions of equipment which can reach high temperatures creating hazardous and potentially dangerous situations.  These pages should not be taken as a step by step guide on how to construct any items or carry out any particular procedure, nor should any references to safety contained herein be taken to guarantee safety in all situations.