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Changing these gears varies the speed that the lead screw turns in relation to the speed that the spindle turns. This allows you to cut threads with different numbers of threads per inch. This calculator determines the correct change gears for any thread pitch.

Dial Assembly | Thread Dial Indicator | LittleMachineShop

To cut true metric threads on a lathe with an Imperial (inch) lead screw (and vise versa) you can't just change the threading dial. You need our Metric Threading Kit which changes the leadscrew, half nuts and the threading dial. There is no threading dial available for metric threading.

Using the Three-Wire Method to Measure Threads - LittleMachineShop.com

Using the Three-Wire Method to Measure Threads. The pitch diameter of a threaded object can’t be measured directly except with specialized thread micrometers. But using three wires of the same known diameter, the thread pitch can be measured with a standard micrometer.

Conversion Kits - LittleMachineShop.com

Metric threading kits let you turn metric threads on your mini lathe. All of our conversion kits come with complete step-by-step instructions. Air Spring Conversion Kit. Converts torsion spring mini mills to air spring. Allows travel to the top of the column. Provides better support for the mill head. $52.95.

Rod Size for Die Threading - LittleMachineShop.com

Reducing the size of a rod you want to thread with a die makes it easier to start the die, but the real secret is to add a 30° chamfer to the end of the rod. Die Blank Size is the Major Diameter less 10% of the Pitch.

Pilot Hole Calculations - LittleMachineShop.com

Metric threads are denoted by Maj_Dia, Pitch, and class of fit. The equations are set to use common thread definitions. These equations may be solved for %_of_Thread as: Unified National: %_of_Thread = (Maj_Dia – Pilot_Dia)(T_Factor * TPI) Metric: %_of_Thread = (Maj_Dia – Pilot_Dia)(T_Factor / Pitch)

Label, Threading Dial (Metric) 2915 - LittleMachineShop.com

Threading dial label for mini lathes; Shows half nut engagement point for cutting metric threads

Metric Threading Kit 10" 1691 - LittleMachineShop.com

Metric threading kit for 7x10 mini lathes. This kit replaces the lead screw and half nuts so you can more easily cut metric threads. You cannot use a threading dial with this kit installed.

Acme Thread Data Sheets - LittleMachineShop.com

The tables following provide information designer’s need to apply 29° Stub Acme threads to projects properly. Please note that callouts for Stub Acme threads currently (2012) exist as: X.XXXX-TPI-NG-STUB-ACME-EXTERNAL for screw threads or X.XXXX-TPI-NG-STUB-ACME-INTERNAL for nut threads.

Metric Threading Kit 14" 2026 - LittleMachineShop.com

Metric threading kit for 7x14 mini lathes. This kit replaces the lead screw and half nuts so you can more easily cut metric threads. You cannot use a threading dial with this kit installed.