Boxford Thread Dial Indicator

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Boxford Thread Dial Indicator. I own a Metric Boxford BUD 5 and occasionally cut threads for which I can use a Thread Dial Indicator to help me when cutting Metric threads. The TDI gauge that I own, however, is for a cousin lathe to the Boxford, it's off a Viceroy but also a product of the Denford group. Although it's marked out for Metric, it has a 32 tooth gear that doesn't quite match my leadscrew, so I assume the Viceroy it came from used an Imperial leadscrew of a bigger diameter than my Boxford which is 3/4" or 19mm. Hence to use this gauge properly, I first wanted to make an appropriate gear for my leadscrew: a reversible 30/28 tooth M3 trapezoidal gear. When I'd done that successfully, I also created a 32 tooth 8tpi gear for Imperial leadscrew owners, that should also work with other South Bend clones. I also made a new PLA printable TDI body along with an appropriate dial and attachment peg. Although I don't own a Myford, I do note that some use a 3/4" leadscrew of either M3 or 8tpi pitch similar to the Boxford/SouthBend, so the TDI should work with those machines too. Most Myfords however use a 5/8" leadscrew and for that reason I've now included appropriate worm gears for them: filenames - "8_Myford_Imperial_Single_32t_Dog.stl", "8_Myford_Metric_Double_28-30t_Dog.stl". Metric Lead Screw (M3) TDI Gear vs cutting pitch 28 0.2 0.25 0.3 0.35 0.4 0.5 0.6 0.7 0.75 0.8 1 1.2 1.5 1.75 2 3 3.5 4 6 30 0.2 0.225 0.25 0.3 0.4 0.45 0.5 0.6 0.75 0.9 1 1.2 1.25 1.5 2 2.5 3 4.5 5 6 28 only 0.35 0.7 0.8 1.75 3.5 4 28 and 30 0.2 0.25 0.3 0.4 0.5 0.6 0.75 1 1.2 1.5 2 3 6 30 only 0.225 0.45 0.9 1.25 2.5 4.5 5 Imperial Single 32t Dog.stl Imperial TDI Body.stl Metric Double 28-30t Dog.stl Metric TDI Body.stl TDI Dial.stl TDI Peg.stl