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Find the gears needed for the gear train
to produce any screw thread on an engineer's lathe.

A PHP program by Evan Lewis: AEDLewis 'AT' g mail 'DOT' com
Link to this program:
The author describing the program: Video about Ride The Gear train
The authors' lathe videos: Evans YouTube Playlists
This includes a video: Understanding Geartrains
Lathe project-2000 year-old steam engine:


Boxford Users Group
Blondihack's: Quinn Dunki's supurb mini-lathe channel
Winky's Workshop: Engineering YouTube channel
Keith Appleton: Model Engineering
Enots Engineering: Alan demonstrates engineering methods
Alan talks about this program
Joe Pieczynski: Joe Pie's channel-excellent engineering demonstrations by a professional
Tony Griffith's has detailed information about every lathe you could imagine.

End User License Agreement, Cookies, Privacy Policy and Copyright Policies

This is an agreement between the user and the software developer (`The Developer` who is identified below).

The Software
`RideTheGearTrain` is online software provided via a web page ( and is intended to be used freely by anyone.

Free Software - No Fees:
The software can be used free of charge. However, if it is used by any commercial entity or activity that generates income it would be appreciated if a donation could be made using links in the main menu.

Limited Liability:
The developer cannot be held liable for any errors or inaccurate results produced by the program. It is the user`s responsibility to check that the recommended gear train, gearbox and other settings produce the desired results.

There are no copyright restrictions on the results produced by the software, but if tables and images produced by the software are reproduced in any form, credit should be given to "Evan Lewis, developer of free software at" or similar text. The copyright on the software itself belongs to The Developer and may not be copied in any form, or reverse engineered, without express written permission from The Developer.

Privacy Policy:
RideTheGearTrain software uses no Cookies and no Log-in
• This software does not record any personal details, personal information or financial information about the user.

• The software does not use cookies (see Advertising below).

• The email address, physical address or IP address of the user are not recorded by the software and cannot be passed on to third parties.

• The user`s IP address is checked for the purpose of the counter which is displayed, but the IP address is not stored permanently.

• The counter only keeps aggregate anonymous totals.

• The Developer does not have any affiliation with any other company or entity.

Cookies and Google Advertising:
• Although RideTheGearTrain software does not require you to log in, and does not use cookies, it may contain advertising provided by Google Adsense, and they may use cookies. The user is referred to Google Adsense, to determine their data collection, privacy policy and use of cookies (see

•Google says: "Google or their third party advertisers, may place advertisements on this web-site and may insert cookies on your computer to provide personalized advertising based on the web-sites you visit. By using this web-site you are giving express permission for cookies to be used by Google Ads and their third parties."

•Google says: "Users can opt out of a third-party vendors use of cookies and other data collection for personalized advertising by visiting:"

•Google says: "users may opt out of personalized advertising by visiting Ads Settings.

•Google says: "Users may visit the websites [of third party vendors or ad networks] to opt out of the use of cookies for personalized advertising (if the vendor or ad network offers this capability)."

•Google says: "For additional details regarding cookie consent notices, please refer to" •Google says: users may opt out of data collection to comply with regulations produced by various countries and regions including UK, Europe and others.

Purpose of the EULA:
This is an agreement between The Developer and the online user.
It describes cookies, the privacy policy, liability waiver and copyright notice.
It is provided to comply with regulations imposed by Europe and several other countries.
Google also requires that we comply with privacy regulations.

Contact Information:
The phrase `The Developer` refers to
Anthony Evan Lewis PhD, MD who can be contacted at AEDLewis at gmail dot com.
He is a New Zealand Citizen and was physically located in New Zealand when this software was written and uploaded.
Any legal issues must be addressed in New Zealand courts unless alternative arrangements are mutually agreed by all parties involved.

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