After more than a week, success was had.

The number of subprojects that went into this one simple little gear boggles my mind.

• Locate a reasonable rotary table
• Document what was needed for it
• Clean and restore 8″ Cushman Chuck
• Make chuck key
• Locate dividing plates for the rotary table
• Make T-Nuts for rotary table
• Make socket-head replacement screws for chuck
• Make socket-head attachment screws for chuck/backplate interface
• Make backplate
• Make retaining collar
• Make MT3 alignment plug
• Modify eccentric to have a retaining grove for U-Spring
• Make grooving tool
• Make nose cap for spindle
• Thread eccentric for tensioning ring
• Make a mandrel for holding gear blanks
• Make gear blanks
• Read the section in the 1914 Machinery’s Handbook about gears
• Create Emacs spreadsheet to calculate gear cutting parameters
• Create a Python program to create a dividing plate table
• Incorporate dividing plate information into Org-mode spreadsheet for single point of information (Enter DP and Number of teeth, get out cutting parameters and which dividing plate to use along with dividing plate setup)

In addition to that, I have 3 toolholders almost finished, I’m still waiting for the dovetail cutter to arrive and then to drill and tap the adjustment screw plus the retaining screws.

For those that might wonder why 14.5° PA, 16 DP instead of a more modern 20° PA, it is because this is what my lathe uses.  With a single purchase of the 8 involute cutters, I can make any gear my lathe might need.