Re: Servo Motor & Driver

--- In CAD_CAM_EDM_DRO@yahoogroups.com, "weedytan" <weedytan@...> wrote:

>
> Hi all,
>
> I was asked by a friend to look at a Taiwan made ACRA Vertical NC Mill
> (year 1996 or 1997) today wherein the controller is dead and to find
> out the feasibility of converting it to a CNC using Mach3 or EMC. Here
> are some details:
>
> 1) The servo motor has a name plate that says: Special VR Motor made
> by Servo Products Co., Pasadena; Voltage - 350VDC; Torque - 115 in-lb
> (continuous); Current - 6 amp/phase; 3 phase; 3.2 Ohms/phase; 400 RPM
> 2) The servo driver board says ZD-6363 Rev I.
> 3) This is a 3-axis NC mill with 3 HP Induction Motor for the spindle
> controlled by a VFD.
> 4) It wasn't in use for about 2 years and it boot up Windows 98. After
> which, it will not go into the software controller.
>
> Since I am more used to Stepper Motors/Drivers, and totally ignorant
> of Servo Motors, may I ask for some assistance for the following:
>
> 1) How can I test without going thru the controller if the servo
> motors and/or servo drivers are still alive?
> 2) If the servo drivers are dead (most likely, as someone previously
> worked on it and gave up), what alternative servo driver can I use?
> 3) Is it advisable to use stepper motors/drivers to replace the servo
> motors/drivers in the same holding torque range? If not, and if I need
> to replace the servo motors as well, what newer model of servo motors
> and drivers can I use? Take note that the servo motor has a continuous
> torque of 115 in-lb (about 13 Nm or 1,840 oz-in).
>
> TIA for whatever info you can provide.
>
> WT
>

Weedy: look at my 3 axis servo controller and MACH3 interface.
Plug-n-go electronics with 850oz-in peak servo motors that spin up to
4000 RPM. Proper belt reduction to typical leadscrew ratios yields
some impressive torque. I am driving a full sized Gorton 10 (similar
to a Bridgport II) and it will snap a 1/2" cutter and never slow down.

We use all Gecko servos and match up the motors and power control
unit. We also use special Gecko plug-in interface cards with intergal
differential receivers and centralized fault shutdown.

tomCAUDLE
www.CandCNC.com
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