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Thread: Standard parts for a 9" Model A
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13th Mar 2018, 01:52 AM #16Intermediate Member
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Thanks for that Anorak Bob. Looks very interesting. I noticed mine has a McPhersons badge on the right hand side.
Well I guess I can call it mine now. I am now the proud owner of a Model A # 11461!
Picked it up Saturday and it is now happily residing in my shed!
It wasn't too bad to lift between 3 of us once we had removed the motor, tool post and tail stock as well as un bolting it from the base.
I still haven''t refitted the motor yet. Life has been a bit hectic the last week.
It didn't have a micrometer saddle stop unfortunately BobL.
I bought a new main drive belt today from Transeals in Welshpool.
A mate has offered me a 4" 4 jaw chuck for $50. Only problem is it is in Melbourne.
Thanks for all the tips and advice so far everyone. Keep them coming if you like.
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13th Mar 2018, 10:21 AM #17Member: Blue and white apron brigade
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Good work Mark.
While the motor is off you should have a look at the connections to see if it suited to a VFD.
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13th Mar 2018, 04:45 PM #18Intermediate Member
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There's nothing very special about it BobL. It's just a single phase motor bolted to the original plate.
What are the advantages of a vfd?
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13th Mar 2018, 04:52 PM #19Most Valued Member
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Standard parts for a 9" Model A
If it’s single phase you can’t fit a VFD. Advantages of a VFD are speed control (fewer belt changes), faster deceleration (not too fast or your chuck will unscrew), jog and overspeed. I reckon it’s the second best addition to a lathe after a QCTP.
Chris
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13th Mar 2018, 05:23 PM #20Member: Blue and white apron brigade
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Chris has pretty well nailed it.
The ability to change speed without stopping the motor is probably for me the most useful feature.
If you use a chuck drawbar type holder you can also reverse the motor direction at the push of a VFD button - useful for unscrewing taps and dies.
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13th Mar 2018, 07:44 PM #21Intermediate Member
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I've got the original 3 phase motor but don't have 3 phase power in my shed.
I might be stuck with the single phase for the time being.
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13th Mar 2018, 08:02 PM #22Member: Blue and white apron brigade
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Well that's another advantage of VFDs.
Up to about 4KW, some VFDs will convert 240V Single Phase to 240V 3Phase.
3Phase motors come in either of two connection modes.
Delta (∆) or Star (Y).
Some motors can be converted from 415V 3P Y to 240V 3P ∆ simply by changing connections inside the motor connection box.
That's why I suggested checking your motor connection box.
Some 3P motors are hardwired as 415V Y but can be converted to 240V ∆ so they can still run from a SP 240V VFD.
The conversion should really be performed by a motor rewinder but this can cost as much as a used motor with the right connections
3P motors hardwired as 415V ∆ cannot be converted to run on 240V since all they can be converted to is a "Y" connection and that will then make them an 830V motor.
In the Woodworkers forum there is a thread dedicated to VFDs and shows many example and explains some of the intricacies.
VFD install summaries
If you want to see a bunch of different machines running on VFDs, PM me to arrange a tour of my shed
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