Member postings for Clive Pearson

Here is a list of all the postings Clive Pearson has made in our forums. Click on a thread name to jump to the thread.

Thread: How to determine the pressure angle of gears

18/11/2010 18:47:52

I need to remake two of the gears in the lead screw gearbox of my Harrison L5 Lathe ( 3 speed ) .Since the new gears will have to mesh with some of the existing gears I understand it is important that they are both cut with the same pressure angle commonly 14.5 or 20 degrees.Having read Ivan Laws book Gears and Gear Cutting I still am unable to see how you determine the pressure angle from the physical dimensions of the existing gears .Any suggestions please .The gears are aprox. 2.5ins. dia.

Thread: Which grade of steel required to make gears

14/06/2010 18:35:13

I have damaged 3 of the gears on my Harrison L5 leadscrew gearbox.

Unable to locate any second hand spares I would like to attempt making them myself but am not sure which grade of steel would be best in terms of machineability and hardness,

They dont appear to be hardened and file easily

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