Re: [CAD_CAM_EDM_DRO] Re: why not just change the motor?

Instruction 1. Go to the website listed bellow.
Instruction 2. Spend the measly $250
Instruction 3. When it arrives read the instructions.
Instruction 4. Hook up about half a dozens wires.
In about an hour your up an running, problem solved. You will be very happy
with results. I have installed several of these on the Bridgeport's and
similar machines. Once you have accomplished this you will never look at,
or think about single phase motors again.

http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&item=2590071421&category=11806

Or www.driveswarehouse.com

Problem solved.

Questions ended and thread over.

----- Original Message -----
From: "Paul" <no.spam27@...>
To: <CAD_CAM_EDM_DRO@yahoogroups.com>
Sent: Friday, January 23, 2004 10:00 AM
Subject: Re: [CAD_CAM_EDM_DRO] Re: why not just change the motor?


>
> Given the choice of using a VFD or trying to find a flange mounted single
> phase motor with an extended shaft, I know which one I would choose.
>
> Pros & cons of a single phase motor:
> IF one could be found to fit the hypothetical Bridgeport... The
contactors
> would need to be replaced. There would be a high startup current that may
> trip the mains breaker (so that would need to be uprated).
> I would only get one fixed speed (1480 RPM approx).
> Reduces the resale value of the machine.
>
> Pros & cons of a VFD:
> Needs a dual voltage motor.
> Established and reliable technology.
> Soft start, so no high startup currents.
> DC injection braking.
> Full overload protection for the motor.
> Simple low voltage controls for on/off
> Variable speed from 0 to 2X (depending on the motor).
> Simple forward/reverse control.
> Reasonably priced units available.
> No need to replace contactors as these are bypassed.
> Does not affect the resale value of the machine.
>
> A VFD is both simple and cheap, and far from being a kludge/bodge. Three
> phase motors and VFD packages are regularly being sold fitted as standard
to
> a number of machine tools by OEM manufacturers.
>
> Regards, Paul.
>
>
> On Friday 23 January 2004 3:41 pm, jlsmith269 wrote:
> > Or, heck, let's get to the heart of the issue, if *I* bought a 2 hp
> > boss 8 cnc, 3ph, I would NOT bother with a vfd on it.. i would get the
> > wiring and motor from a 2 hp 220 1ph , and bolt it on... and yeah, I
> > would spend DOUBLE or more for that simple solution, rather than
> > kludge it, knowing I am introducing unknowns into a pc-cnc/enc setup.
>
> --
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