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Need a source for an 8 pole 3 phase motor

marka12161

Stainless
Joined
Dec 23, 2016
Location
Oswego, NY USA
I've had the hendey tiebar in the shop for almost two years now and in the near future (relative to the glacial pace that i do things) i'll be tackling the clean up and setting up the drive system. The machine came with a 2 hp single phase motor driving he original counter-shaft pulley through a single stage speed reduction. Given the motor speed (1750 rpm) and existing sheav sizes, i've worked out the flat belt pulley diameters necessary to achieve the original counter-shaft speeds and therefore original machine speeds.

Subsequent to this plan, i've been kicking around the idea of replacing the single phase motor with an 8 pole three phase motor for two reasons:

* Three phase machine are easy to run in reverse (for tapping)

* An 8 pole machine will run at something less than 800 rpm therefore reducing the diameter of the flat belt pulleys i'll need to fabricate.

Anybody know of a good source?
 
I think somewhat less than 900 - like my 10 HP 1917 865 RPM Westinghouse

I used to look around with the Ebay search of 865 RPM.

Example: (I see he is 100 off on frame size in About This Product )

eBay - Page Not Found

Never very cheap, but there you go

Might check with Hendeyman on running backwards - the one way clutches for the lead screw reverse may object
 
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I've had the hendey tiebar in the shop for almost two years now and in the near future (relative to the glacial pace that i do things) i'll be tackling the clean up and setting up the drive system. The machine came with a 2 hp single phase motor driving he original counter-shaft pulley through a single stage speed reduction. Given the motor speed (1750 rpm) and existing sheav sizes, i've worked out the flat belt pulley diameters necessary to achieve the original counter-shaft speeds and therefore original machine speeds.

Subsequent to this plan, i've been kicking around the idea of replacing the single phase motor with an 8 pole three phase motor for two reasons:

* Three phase machine are easy to run in reverse (for tapping)

* An 8 pole machine will run at something less than 800 rpm therefore reducing the diameter of the flat belt pulleys i'll need to fabricate.

Anybody know of a good source?

I'd STRONGLY reommend a decent tapping head. Or more than one.

What John said, plus.. there's too much inertia, mass, and slack hence delay , even BOUNCE, between the motor you just reversed and the flutes of the tap.

That ain't unique to veteran Hendeys, either. Not by an ever-lovin' long shot it ain't!

Tapping heads were no luxury. Hand-pullover and Tommy-bar was not uncommon if you had no such. Or second-op on the radial DP. DAMHIKT!

The motor isn't a bad idea, though. These folks had five of my stable of Reliance RPM III DC motors alone, one single trip, and were worth a second trip for much nicer goods and better stored than HGR have, Good stuff. No junk.:

Equipment Recovery Corp - Industrial Equipment

Motors are here:

Used Equipment
 
An eight pole motor is substantially larger than its 2 or 4 pole counterpart. As the number of poles increases, yes the speed decreases, but you get a larger physical size motor. This may or may not be of concern for you. If you have the pulleys sizes figured for a 1750 RPM motor go for it. You could also use a VFD for speed control for the 3 phase motor$$$. Gear boxes with 4 speeds can be found and used so you don't have to switch belts. DC motors off of treadmills will also get you speed control and power. Many treadmills sitting curbside on garbage day just waiting for repurpose.
 
I'd STRONGLY reommend a decent tapping head. Or more than one.

What John said, plus.. there's too much inertia, mass, and slack hence delay , even BOUNCE, between the motor you just reversed and the flutes of the tap.

That ain't unique to veteran Hendeys, either. Not by an ever-lovin' long shot it ain't!

Tapping heads were no luxury. Hand-pullover and Tommy-bar was not uncommon if you had no such. Or second-op on the radial DP. DAMHIKT!

What sort of tapping head works on a lathe, all my tapmatics need to be powered, they will not work in a tailstock unless you have a live quill. I power tap on my lathes daily without issue. Just flip it straight into reverse. Yes on the SB with a thread on chuck. No it does not fly off and do a burnout across the floor.
 
Try HGR in cleveland. I bought a new 6 pole 1.5 hp 3 phase for 50 bucks to repower a line drive shaper a couple months ago. They have own website with better prices than their ebay store. Lots of stock turnover, so frequent checking recommended. They will ship but with acres of indoor tool porn it's worth a trip..
 
What sort of tapping head works on a lathe, all my tapmatics need to be powered, they will not work in a tailstock unless you have a live quill. I power tap on my lathes daily without issue. Just flip it straight into reverse. Yes on the SB with a thread on chuck. No it does not fly off and do a burnout across the floor.

Well yes. There's probably a lot of neat things one can do on a small hobby lathe. Instrument lathe or watchmaker's lathe, even more so.

Rapidly reversing a(ny) lathe with more significant mass in play is a somewhat less trivial exercise!

:)
 
An eight pole motor is substantially larger than its 2 or 4 pole counterpart. As the number of poles increases, yes the speed decreases, but you get a larger physical size motor. This may or may not be of concern for you.
'

Very true- I have a 3/4 HP 450 RPM 3 phase motor that is a beast in terms of bulk and weight (the fact that it is a very early GE industrial motor probably adds to the heft), and a modern TECO/Westinghouse 1 HP 870 RPM motor that is also a beast compared to a 1HP 1725 or 3650. On the other hand, the less "in between" you go through, the less power you lose along the way...
 
Re: potential sources, I have had really good experiences buying various things, including motors, via NRI Industrial's sales on ebay. They seem to price things realistically (rather than the types where everything they sell is 'RARE') and when they give a "make offer" option, they seem to mean it- when I've made offers at 70-80% of their asking price, they've cut to the chase and accepted it without a lot of back and forth.
Not sure if they have much right now for what you want, but in case, or so you can continue to monitor:
NRI Industrial Sales | eBay Stores

Also, try searching 870 RPM on ebay. The hard thing about finding 8 pole motors on ebay is that some of the potentially relevant RPM ranges like 880 get confused in the ebay search engine with the VAC part of the specs, and you get a deluge of ~800V motors at all sorts of RPMs. 870 isn't a standard VAC spec, and it is sometimes an RPM spec, so it may help you sift (along with John's suggested '865' - and, while you are at it, try 850...)
 
Re: potential sources, I have had really good experiences buying various things, including motors, via NRI Industrial's sales on ebay. They seem to price things realistically (rather than the types where everything they sell is 'RARE') and when they give a "make offer" option, they seem to mean it- when I've made offers at 70-80% of their asking price, they've cut to the chase and accepted it without a lot of back and forth.
Not sure if they have much right now for what you want, but in case, or so you can continue to monitor:

Seconded. I have had nothing but positive experiences with NRI. A plus is they seem to have resources in both Canada and the US, but get goods back and forth themselves so shipments to the customer originate same country and have already crossed the border.
 
What sort of tapping head works on a lathe, all my tapmatics need to be powered, they will not work in a tailstock unless you have a live quill. I power tap on my lathes daily without issue. Just flip it straight into reverse. Yes on the SB with a thread on chuck. No it does not fly off and do a burnout across the floor.
Don't quote me here, but I think...(doo that sometimes),
that the "Tapping head" they are referring about for the lathe
is a "pull off" affair.

With the tap in the turret (and installed in the pull off holder)
either the turret travel hits the stop (and the tap continues to wind itself in,
or you pull the turret backwards.

The tap advances out of the holder slightly, un-engaging
the drive lugs inside, allowing it to free spin.

Gives you plenty of time to stop the spindle, and then
reverse it. At which time, the tap slides back into
engagement with the drive lugs.

No need to plug reverse the motor/drivetrain.
 
Don't quote me here, but I think...(doo that sometimes),
that the "Tapping head" they are referring about for the lathe
is a "pull off" affair.

With the tap in the turret (and installed in the pull off holder)
either the turret travel hits the stop (and the tap continues to wind itself in,
or you pull the turret backwards.

The tap advances out of the holder slightly, un-engaging
the drive lugs inside, allowing it to free spin.

Gives you plenty of time to stop the spindle, and then
reverse it. At which time, the tap slides back into
engagement with the drive lugs.

No need to plug reverse the motor/drivetrain.

More than one type out there, and OF COURSE there can be power back of it, but when "SB" was posited as the mount rather than ... never mind...

I didn't really see the point...

:(
 








 
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