For the PM-1440GT owners. I created an Excel spreadsheet calculator for the change gears for threading. It can show the thread pitch for both inch and metric threads for any change gear and lever/knob combination. When the change gears are set for inch threads the Metric Pitch table shows the metric equivalent. Visa versa when the change gears are set for metric threads the Thread per Inch table shows the inch equivalent. I currently have it setup to select the gears with drop down boxes in the upper left. Click on the cell to change and a selector box will show. Click on the box to make a gear selection. The table updates automatically. The rest of the sheet is protected to keep from accidentally changing a cell with a formula. It is not password protected so if someone wants to experiment with different gear sizes you can turn the protection off and edit the drop down lists. I am also working on a feed calculator. As soon as I can figure out the apron gearbox ratios I will post it. I hope you find it useful. FYI on the name plate on the head stock there is a typo for one of the lever selections. On the TPI chart for the 5.75, 11.5, 23 & 46 threads using the 69T lower gear the shift lever setting should be R-X. It is currently listed as P-X. The manual is also wrong.