Thread: Motor replacement

I'm interested 3Ph to 1Ph motor replacement experiences.
What 1Ph HP motor is recommended.
Any tricks and tips to watch out for?

Maybe there's a thread on this already - I searched but couldn't find anything.

Thanks

Depending on what you want to do and how much you want to spend either a 1/2 HP 3/4HP or 1HP.
Would also suggest that you get a motor that is reverseable,and a Drum switch.

Bobl,

I reckon you'll need a 3/4HP motor, 1425 rpm or thereabouts with a pulley about 2.25" to 2.5" in dia.

This subject has been covered before, but can't find it either. I recently purchased Crompton motor on eBay for around $180, shaft size 5/8" dia with correct mounting plate.

If you type "Crompton electric motor" into eBay, you will come up with many alternatives. They are made in India, and seem to be of good quality. The motor is reversible, as Pipeclay suggests.

I have no connection with the Seller.

Ken

Thanks Pipeclay,
Couple more questions
What RPM should the motor be?
And would something like this be OK?
https://www.machineryhouse.com.au/Pr...stockCode=E050
I realize it will need a drum switch and be wired for reversing.
Thanks

Originally Posted by neksmerj

Bobl,
I reckon you'll need a 3/4HP motor, 1425 rpm or thereabouts with a pulley about 2.25" to 2.5" in dia.
This subject has been covered before, but can't find it either. I recently purchased Crompton motor on eBay for around $180, shaft size 5/8" dia with correct mounting plate.
If you type "Crompton electric motor" into eBay, you will come up with many alternatives. They are made in India, and seem to be of good quality. The motor is reversible, as Pipeclay suggests.

Thanks Ken.
Thanks for the info on the shaft size. I'm fine to make any necessary adapter for the base and my lathe has a swivel baseplate so adjustment should be easy enough.

That motor should be fine,if thats what you decide on I would suggest you contact CMG direct as I think there prices may be lower than stated in the add,not sure if there in WA but they are in NSW,

ive just gone throught the same process one thing i found make sure the capacitor housing is on the top of the motor or you will have to extend the mounting plate out further. also i have fitted an adjustable pulley made by braemer ( comes off an aircondioner) whereby one side of the pulley can be screwed in or out to make different diameters 2 belts of different lengths are needed though ...i havent used the bigger diameter yet

Originally Posted by tanii51

ive just gone throught the same process one thing i found make sure the capacitor housing is on the top of the motor or you will have to extend the mounting plate out further. also i have fitted an adjustable pulley made by braemer ( comes off an aircondioner) whereby one side of the pulley can be screwed in or out to make different diameters 2 belts of different lengths are needed though ...i havent used the bigger diameter yet

Thanks Tani. I am experienced with high voltage electronics so if needed I am happy to move the Cap housing. What motor size/type did you end up using?

Thanks
Bob

1hp 1440rpm CMG and reversable.... Bob only because i had one ...before that i had a 1/3 hp washing machine motor which worked fine for most things but using higher speeds for tungsten carbide tools stressed it out till it finally died but it was probably 50+years old. I still use slack belts incase i stuff up some where

Just curious as to the max depth of cut you might be taking and the feed rate you are also using and the type of material you have cut with your 1 HP with slack belts.

HI, I spoke to Hercus a Year or two ago about Motor H.P. sizes. I have a Model A Hercus Plain Bearing Lathe. They told me 1/2 H.P. Is Standard, but they will handle a 3/4 H.P. Motor. I would think that on a Roller Bearing Hercus (Model A Type) a 3/4 H.P. or 1 H.P. Motor would be suitable. There is a Mob on Ebay selling Forward / Reversing Switches for about $99.00 plus Post. I think it is the same ones that sell the Crompton or CMG Motors on Ebay.
All The Best steran50 Stewart

Thanks Guys - all very useful stuff.

pipeclay the belt has about 1 inch deflection in the middle(thespeed change)and its one of those link belts as for feed rates and depth i m going gentle only max of 2mm depth approx on roughing cuts and hand feed rate just so it feeds easily without too much chatter or vibration ......as slow as it will go with auto feed 450 rpm till im confident i can up the feed and speed rates all with tungsten carbide tooling
screw cutting as slow as i can get it

The depth of cut seems ok,I find with mine at .100 doc and .002 feed at 500/700 rpm it seems to labor a bit,but dosent mind .080doc.
I thought maybe with you saying that the belts were a bit slack that your doc might of been restricted.

i did it deliberatley as i think maybe 1 hp is a bit much so if i leave the belt a little slack maybe it will prevent something drastic breaking if i do something wrong as it is if i apply to heavy a feet rate or cut the belt starts to slipso i know to back off