Thread Dial Indicator

Image required of TDI

We have a custom designed 3D printed Thread Dial Indicator (TDI). It is works exactly the same as the original manufacturers dial so the PDF of Harrison M250 Manual can be used as a reference. There are in fact two TDIs a Green one with a 20 tooth drive cog and a Blue one [COMING SOON] with a 21 tooth drive cog. Which one you use depends on the pitch of the thread you are wanting to cut, see table below.

The TDI is normally not fitted to the Lathe to reduce ware.

• Ensure the metal bolt is screwed back in to the body of the TDI.
• Place the locating lug in the locating hole on the right hand side of the Carriage.

.. Image required of lug.

• Rotate the TDI so as to bring the teeth of the cog to mesh with the Lead Screw.

• Now screw the bolt in to the threaded hole and tighten firmly with 6mm Allen key.
• Please remove the TDI when you have finished using it.

To do

To do