Re: [CAD_CAM_EDM_DRO] Bridgeport Boss 6 Stepper Motors

Jon,

Do you have a rule of thumb for force at the tool? I know this would be
dependant on tool type, material to be cut, and tool diameter, but some
starting point with as many qualfications as you care to list would be
helpful.

----- Original Message -----
From: "Jon Elson" <elson@...>
To: <CAD_CAM_EDM_DRO@yahoogroups.com>
Sent: Friday, June 14, 2002 2:29 PM
Subject: Re: [CAD_CAM_EDM_DRO] Bridgeport Boss 6 Stepper Motors


> vavaroutsos wrote:
>
> > Does anyone know what the model number of the stepper motor that was
> > used on the Series I Bridgeport with Boss 6 control? The ones from my
> > machine are already gone. I know they were made by Superior Electric,
> > but nobody at Bridgeport or Superior knows what was used.
> >
> > I would like to find the specs so I can get a better idea of the
> > force that Bridgeport provided on each axis. This will help me in
> > sizing some new servo motors.
>
> Note that servo and stepper motors have such different performance, that
> a direct comparison is not correct. Steppers have a severe falloff in
> torque as the speed increases. Servos generally provide full torque
> up to the maximum speed that can be achieved with a perticular power
> supply voltage. Servos also have the capability to provide peak torque
> that is above the continuous rated torque for some short time.
>
> So, if 1600 In-Oz motors stepper were used, a 400 in-Oz continuous
> rated servo motor would likely do. Also, if the steppers were direct
drive,
> you could use a 100 Oz (cont) servo with a 4:1 belt reduction ratio, as
> the servo generally has no trouble spinning at several thousand RPM.
>
> What you might want to do is define the highest feedrate and rapid
traverse
> speeds you will want to run at, and the leadscrew pitch, and do some
> elementary calculations to determine the motor needed to reach that
> performance. (I'm using 1/8 Hp (cont) servo motors on my Bridgeport,
> and I can deliver 1000 Lbs linear force to the table, which seems to be
> enough to bust things pretty good!) See http://206.19.206.56/motor.htm
> for how I calculated this.
>
> Jon
>
>
>
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