Harrison 140 Spindle Speeds.

Harrison 140 Spindle Speeds.

This topic has 4 replies, 4 voices, and was last updated 22 March 2017 at 21:13 by Chris Barry.

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20 March 2017 at 19:28 #289716
Tony Falloon
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@tonyfalloon30241
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?
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20 March 2017 at 19:28 #12924
Tony Falloon
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@tonyfalloon30241
22 March 2017 at 14:20 #290037
Jon
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@jon
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.
22 March 2017 at 17:19 #290067
Nick_G
Participant
@nick_g
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
22 March 2017 at 21:13 #290117
Chris Barry
Participant
@chrisbarry
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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