Understanding Gear Trains - An updated improved version

This replaces an old version of Understanding Gear Trains that I made 4 years ago. It had 21,000 hits. This version should be much better and worth 25 minutes to watch. It is intended for anyone who wants to know how to calculate the gear ratio of the gear train of an engineer's lathe. At the end I introduce my free online computer program which calculates the gear train required to cut any thread using the users own gear collection - RideTheGearTrain.com.
The online program:
RideTheGearTra...
Tutorial 1A RideTheGearTrain -for mini-lathe users
• Mini Lathes-Tutorial-1A-for-RideTheGe...
Tutorial 1B RideTheGearTrain -for all other users
• Tutorial 1B for users of South Bend &...
Tutorial 2 RideTheGearTrain -for all users
• Tutorial for RideTheGearTrain - Part 2
Playlist:
www.youtube.co....
Season 2 Episode 6 of the playlist
"How to use a general engineering lathe" by Evan Lewis (evan-e-cent now evanecent).
Boxford Users Group:
groups.io/g/Bo....
Patreon:
Consider supporting this channel on Patreon:
evanecent

[@philvale5724]

Hi 👋 I am new to your channel, I have been looking for more info on Boxford , I have just been given a Boxford lathe, I have not picked it up yet, I have only seen it once, but I think it needs some work on it, as it has not been used for years,
If it is possible to contact you in the new year for some help please, my other problem is that I live in France, and cannot find help over here,
It looks like you have a great following, Regards Phil from the moulin France

[@Evan-e-cent]

Yes sure. I suppose you found my UA-cam channel about the Boxford Lathe: UA-cam.com/evan-e-cent/playlists should work. Contact me at AEDLewis at g mail . com

[@Evan-e-cent]

How's the new Boxford working out?

[@trollforge]

It has been a long time since I watched the 1st video, but I do believe this is easier to understand.

[@Evan-e-cent]

That is what I was trying to achieve, so thanks for that! In the original I had problems with the fluorescent lights reflecting off the white-board and was not very happy with the production. I think I need more vidoes, especially to discuss metric-Imperial conversion. I have developed a new equations for that.

[@trollforge]

@@Evan-e-cent Yes I would love to see Imperial to metric conversion videos!

[@heinvosloo45]

Wonderful video! Thanks very much. It is clear and for the first time I now understand how the gear train works on my Boxford lathe.

[@Evan-e-cent]

Thank you! I wish UA-cam would give eit better promotion.

[@XXXXIndices]

I have a 80 year old New Visbly lathe with a 4 TPI Leadscrew and includes a 127 tooth gear used on the leadscrew. The Lathe has a copper plate with metric threads, do you know if I can then use the indicator on the leadscrew and be able to disengage the half not while cutting threads?

[@Evan-e-cent]

No, if you are cutting metric threads on an imperial lathe (or imperial threads on a metric lathe), you cannot use the thread dial indicator (TDI) and it is not recommended to disengage the half-nuts from the leadscrew. Instead you either have to run the motor in reverse, or turn it backwards by hand. If you have a chuck that screws on you have to be careful to make sure it doesn't unscrew, especially if the motor is running in reverse. You cannot use the reversing lever in the gear train. This is used for cutting left hand threads.
If you run RideTheGearTrain dot com and select a metric thread, you will see a help button called "Half Nuts". This is not referring to your sanity, but reading it may lead to insanity. I will place the link below.
My UA-cam videos explain how to connect a reversing switch to a typical single phase motor, and another video explaining how variable speed motors work, and others about how I installed a variable speed DC motor in my Boxford lathe.
Now, I love my variable speed, reversing motor, especially for cutting threads. I start a thread slow, speed up through the middle and gradually slow to a stop at the end of the thread, withdraw the tool and run fast in reverse to get back to the beginning of the thread ready for the next cut. It is even a good way to do imperial threads.
The help file below gives more explanation and links to several useful videos. One even shows how you can disconnect the half-nuts if you strictly follow his technique.
I hope you find all this helpful!
ridethegeartrain.com/index.php?fnname=chooseThread%3EbeforeSubmit_notIndep_handleHidVar&adflag_f=yes&gearboxbrand=Imperial_no_gearbox&previouslathe=Imperial_no_gearbox&gearboxfitted_f=no&lathetype=imperial&threadtype=metric&threadsize=2&compoundincluded=1&autocompound_f=yes&errormax=1&maxresults=2000&changegearstring=16%2C24%2C36%2C40%2C56%2C56%2C60%2C100&changeleadscrew_f=no&leadscrew=8&powerfeed_f=no&carriagefeedratio=0.34&crossfeedratio=0.1&changeablestud_f=yes&studgear=40&changeablelsg_f=yes&leadscrewgear=56&range=single&lolim=4&hilim=8&interval=1&prefintro=yes&prefquickstart=yes&preftutorials=yes&prefourlinks=yes&prefinputtext=yes&prefspecstext=yes&prefgeartables=yes&prefgearboxtables=yes&stud=40&lsg=56&customdone_f=no&numn=1&numl=1&numgears=8&primaryratio=1&stdstudgear=40&stdleadscrewgear=56&stdleadscrew=8&stdcarriagefeedratio=0.34&stdcrossfeedratio=0.1&stdchangeablestud_f=yes&stdchangeablelsg_f=yes&stdgearboxfitted_f=no&stdcompincluded=1&stdauto_f=yes&stdchangegearstring=16%2C24%2C36%2C40%2C56%2C56%2C60%2C+100&stdcompoundgearstring=127%2F100&zout=yes&zin=yes°lab=no&ptab=no&pcurve=yes&psymb=no&pline=yes&pcircle=yes&fullsearch_f=no&restricted_f=no&mode=afterDataInput&pagename=chooseThread&helppage=chooseThread&helplabel=Half_Nuts&threadrequested=mm#Half_Nuts

[@XXXXIndices]

Thank you Evan for the detailed reply. The plan is to eventually fit an Electronic Leadscrew, but for now I will ave to work with leaving the half nut engaged.@@Evan-e-cent

[@Evan-e-cent]

RideTheGearTrain has a button for people designing electronic leadscrews (ELS). Just some fairly basic calculations of gear ratios and pulse counting.@@XXXXIndices