Hi Terry, Thanks again for your link to "CHANGE.ZIP" - I am not sure I understand the note starting with "05/21/05" It has been quite a few years since I have unzipped a file. I am surprised to find that Windows of various shades have the unzipping program built in. I have downloaded and unzipped the Changewheel program. I haven't got the hang of it yet - particularly how you set up the list of gears that you have available and how you instruct the program that you want imperial threads, or metric threads. I am sure a little playing with it will show me how to do this. I won't be able to play with it for some days as I am going up to the Midlands in order to visit a fellow model engineer, and then we will both go off to the Midlands Model Engineering Exhibition. This involves a couple of days travel on National Express buses. Lets hope that the rain isn't too bad for the sake of the car-park at the exhibition site. Cheers, Roger Mason, in St. Agnes. On 11/10/2014 20:22, Terry Lane wrote: > Oops - that should be CHANGE.ZIP - this lack of black puddin' is playing > havoc with my brain cells. > *CHANGE.ZIP <http://www.myvirtualnetwork.com/mklotz/files/change.zip> > (~61 Kbytes) > 05/21/05* Finally took a stab at writing a program to select change > gears to obtain a desired thread pitch/carriage feed. With the usual > data file for tailoring to your equipment. New improved version added > 6/2/01. MODEL ENGINEERING DISCUSSION LIST. To UNSUBSCRIBE from this list, send a blank email to, modeleng-request@xxxxxxxxxxxxx with the word "unsubscribe" in the subject line.