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Harrison 140 Spindle Speeds.

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Tony Falloon	20/03/2017 19:28:19
16 forum posts 4 photos	Harrison 140's that were destined for schools and training establishments had a maximum spindle speed of 750rpm. Others 140's that were destined for shop floors had spindle speeds in excess of 1000rpm. Does anyone know what it would take to convert my lathe to the higher speed version?
Jon	22/03/2017 14:20:31
1001 forum posts 49 photos	Buy an ex school one 1000rpm 1ph 240v 1.5hp motor. Long since scrapped, heres an action shot at 1000rpm with 1/2" facing cut. Bottom right says 1000rpm. Apart from a different motor running speed, change a pulley. Ratios then wont tally with the chart speeds.
Nick_G	22/03/2017 17:19:17
1808 forum posts 744 photos	Posted by Tony Falloon on 20/03/2017 19:28:19: Does anyone know what it would take to convert my lathe to the higher speed version? . The price of a 3 phase motor if not already fitted and the price of a VFD would be my first thoughts to check out. So either a 4 pole with the VFD frequency blipped up a bit or a 2 pole backed off. (possible cooling issues with this option) You could even get fancy and put a £10 ebay tachometer on the spindle. Nick
Chris Barry	22/03/2017 21:13:20
43 forum posts 18 photos	The Lathes bearings are the high speed ones from built according to the manual, I've put a new motor 3hp motor with vfd on mine. Very rarely run it higher but it's useful for finishing cuts. Chris

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