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Posted by Karl Townsend on May 29, 2008, 12:03 pm
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My Supermax has landed. This knee mill has both horizontal and vertical
spindle motors. They are 5 hp. The vertical spindle will start with my 3
phase converter system, but repeated start/stop/start/stop will trip the
breaker. The horizontal spindle trips the breaker unless the drive belts are
removed. And then it "just" starts. Running load is just a few amps and I
know I'll never go to full horsepower cutting.
I have a 30 amp breaker on #10 wire going to a homemade "Fitch" RPC. Then
#12 wire throughout the shop. I can't read the nameplate on the RPC motor -
I think its a 3 hp.
I'm looking for suggestions to be able to start this mill without a complete
re-wire job. Some kind of soft start?? larger RPC pony motor?? I'll
consider a VFD only as a last resort.
Otherwise, this is one serious mill. I can now look down my nose with
disdain for those folks using a Bridgeport.
Karl
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Posted by Pete C. on May 29, 2008, 12:22 pm
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Karl Townsend wrote:
>
> My Supermax has landed. This knee mill has both horizontal and vertical
> spindle motors. They are 5 hp. The vertical spindle will start with my 3
> phase converter system, but repeated start/stop/start/stop will trip the
> breaker. The horizontal spindle trips the breaker unless the drive belts are
> removed. And then it "just" starts. Running load is just a few amps and I
> know I'll never go to full horsepower cutting.
>
> I have a 30 amp breaker on #10 wire going to a homemade "Fitch" RPC. Then
> #12 wire throughout the shop. I can't read the nameplate on the RPC motor -
> I think its a 3 hp.
>
> I'm looking for suggestions to be able to start this mill without a complete
> re-wire job. Some kind of soft start?? larger RPC pony motor?? I'll
> consider a VFD only as a last resort.
>
> Otherwise, this is one serious mill. I can now look down my nose with
> disdain for those folks using a Bridgeport.
>
> Karl
Larger idler motor on the phase convertor would probably do it, as would
starting the vertical spindle before trying to start the horizontal so
the vertical motor acts as an additional idler. The VFD is certainly the
best way to go, and you could with appropriate safety interlocks
multitask a single VFD to run either motor (one at a time).
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Posted by Steve Lusardi on May 29, 2008, 1:52 pm
Please log in for more thread options Karl,
I once owned a hydraulic shift Cincinati knee mill with dual spindle motors
as well. Lovely machine. Depending on the motors and the number of wires
available, you could use a two way start switch where you start the motors
in a "Y" configuration and then, when up to speed, switch them to delta for
running under load, but you need 12 wires not 6..
Steve
> My Supermax has landed. This knee mill has both horizontal and vertical
> spindle motors. They are 5 hp. The vertical spindle will start with my 3
> phase converter system, but repeated start/stop/start/stop will trip the
> breaker. The horizontal spindle trips the breaker unless the drive belts
> are removed. And then it "just" starts. Running load is just a few amps
> and I know I'll never go to full horsepower cutting.
>
> I have a 30 amp breaker on #10 wire going to a homemade "Fitch" RPC. Then
> #12 wire throughout the shop. I can't read the nameplate on the RPC
> motor - I think its a 3 hp.
>
> I'm looking for suggestions to be able to start this mill without a
> complete re-wire job. Some kind of soft start?? larger RPC pony motor??
> I'll consider a VFD only as a last resort.
>
>
> Otherwise, this is one serious mill. I can now look down my nose with
> disdain for those folks using a Bridgeport.
>
>
> Karl
>
>
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Posted by Ignoramus9931 on May 29, 2008, 2:12 pm
Please log in for more thread options There are two easy and obvious answers:
1) Use a bigger idler (easiest and cheapest by far)
2) Use a VFD (whether it is easy depends on the control system).
i
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Posted by Brian Lawson on May 29, 2008, 8:04 pm
Please log in for more thread options On Thu, 29 May 2008 11:03:31 -0500, "Karl Townsend"
>My Supermax has landed. This knee mill has both horizontal and vertical
>spindle motors. They are 5 hp. The vertical spindle will start with my 3
>phase converter system, but repeated start/stop/start/stop will trip the
>breaker. The horizontal spindle trips the breaker unless the drive belts are
>removed. And then it "just" starts. Running load is just a few amps and I
>know I'll never go to full horsepower cutting.
>
>I have a 30 amp breaker on #10 wire going to a homemade "Fitch" RPC. Then
>#12 wire throughout the shop. I can't read the nameplate on the RPC motor -
>I think its a 3 hp.
>
>I'm looking for suggestions to be able to start this mill without a complete
>re-wire job. Some kind of soft start?? larger RPC pony motor?? I'll
>consider a VFD only as a last resort.
>
>
>Otherwise, this is one serious mill. I can now look down my nose with
>disdain for those folks using a Bridgeport.
>
>
>Karl
>
How about an idler pulley/simple style "clutch"?
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> My Supermax has landed. This knee mill has both horizontal and vertical
> spindle motors. They are 5 hp. The vertical spindle will start with my 3
> phase converter system, but repeated start/stop/start/stop will trip the
> breaker. The horizontal spindle trips the breaker unless the drive belts are
> removed. And then it "just" starts. Running load is just a few amps and I
> know I'll never go to full horsepower cutting.
>
> I have a 30 amp breaker on #10 wire going to a homemade "Fitch" RPC. Then
> #12 wire throughout the shop. I can't read the nameplate on the RPC motor -
> I think its a 3 hp.
>
> I'm looking for suggestions to be able to start this mill without a complete
> re-wire job. Some kind of soft start?? larger RPC pony motor?? I'll
> consider a VFD only as a last resort.
>
> Otherwise, this is one serious mill. I can now look down my nose with
> disdain for those folks using a Bridgeport.
>
> Karl