![]() Not surprisingly, an exact match is not available but there are 11 combinations using standard gears that provide a value of 8.4656 TPI. 25.4 divided by 3 gives a value of 8.4667TPI. However, very close values can be achieved for most metric pitches using the standard gears.įor example, take a required pitch of 3mm. If you want to make exact threads you will need 127 and 50 tooth wheels to give an exact metric lead fro your imperial leadscrew.Īs John says you will need to use a 127 tooth gear to achieve precise metric pitches, that is of course dependent on the accuracy of the leadscrew on your lathe. What do you want the threads to do? Short metric threads for fasteners can be approximated on an imperial lathe by the right choice of change wheel often to within the accuracy of the lathe. Its an emco with an imperial box it now transpires, How would i cut metric threads on the lathe? ![]()
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