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trevoratxtal:
Sorry Rob I should have said! I converted my motor to 240 by rewiring to delta configuration And upped the size of the pulley on the Motor. I had to delve inside the motor to find the the star connection point.
The reason I converted to 240v rather than 440v is that the converter produces some spiky square waves, the back EMF from them is rather high, and as the original insulation would have been tested for nice sine waves, I erred on the safe side and lowered the voltage. Well it works for me some hundreds of hours later.
This gave me top speed just under 3000rmp with the converter running the motor at 70 Hertz.
The L5a has slightly different Gearing to the L5 , so yours would be a bit different the motors are standard rated 50 to 60 Hertz but are tested up to twice the speed IE 120 Hertz so taking to at 70 seemed safe to me.
If you run prolonged at less than 50 Hertz then fitting a external fan might be a good Idea I used a 240v computer fan fixed to a plate on the end of the motor. I took one from a failed computer power supply, they are also cheep to buy from a computer repair place.
So far I have converted two lathes The Harrison and a 920 Chinese type, also my Mill.
If you would like to chat contact direct.
I will add some photos when it is warm enough to play outside.
Trevor B

M WILL:
hi everyone have a lathe chester 920 in great order being sold new on here can anyone help with the sale or point right direction to sell it. thanks.

M WILL:
hi slow coach i have a 920 chester lathe i know u had one on here for sale i have it for sale too wondering if u had any enquiries that may be interested. cheers....

Rob.Wilson:
M WILL

Have you just joined Madmodders to sell your lathe ?

Rob

John Rudd:
@ Slowcoach/Rob,

the originator of the project is Les Jones... I can pm you his email addy if you want ( to protect him from spammers )

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