Sherline Driver Box and Stepper
Motors
P/N
8760 plus 8765 and 8770 kits
The
P/N 8760 Sherline driver box includes 4 drivers, a power supply, 4 connection
cables, a parallel cable, and Linux/EMC software. Packages with driver box and
stepper motors are also available. See below. (Click on photo for larger
image.)
• 8760 Driver
Box only
$948.70 inc GST
• 8765 Driver
Box and two 67127 stepper motors (lathe)
$1,178.00 inc
GST
• 8770 Driver
box and three 67127 stepper motors (mill)
$1,311.00 inc GST
The 8765 and
8770 kits are designed for those who wish to purchase a CNC ready lathe or mill
and use their own computer. The 8760 is for applications where stepper motors
are already in place.
· Mach3 operating software & Licence for Windows®
$297.00 inc GST
· 68773 USB adaptor for Mach3 using USB parallel port
$385.00 inc GST
Description of the Driver Box
For those who wish to run the
stepper motors on their Sherline CNC-ready machines using their own computer,
we offer the driver box and power supply as a separate item.
The anodized aluminium box
contains four drivers. Each outputs to its own cable, labelled X, Y, Z,
and A, that plugs directly into Sherline's P/N 67127 stepper motors.
These stepper motors are pre-wired with a plug to match that on the end of the
driver box cables, making hook-up easy and fast. A 25-pin parallel cable
(included) runs from the box to the parallel port on a computer. Power
comes from an external power supply (included) that plugs into the box.
Also included is a CD that contains the correct version of the Linux operating
system and EMC control program that Sherline uses in its CNC system, should you
wish to install them on your own computer. The operating instructions for
CNC and a short course in writing G-code by Joe Martin are also included.
The driver box has its own power on/off switch and a bright red LED that
indicates when power is on. It operates on either 110 or 220 VAC power
(switchable).
To read operation
instructions for hooking up and using the 8760 Driver box CLICK HERE. (File is in .PDF
format--requires Adobe Acrobat to open.)
Technical Specifications, P/N 8760 Stepper Motor Driver
Power Supply:
Input: 100-240 VAC, 47-63 Hz, 3A
(automatically adapts to incoming voltage)
Output: 24 VDC, 4A
Parameters:
∙ Logic high levels should
be greater than 2 volts.
∙ Logic low should be less than 1/2 volt.
∙ Step pulses are active low.
∙ Step pulses should be at least 22 microseconds long.
∙ The lines labelled as EMC inputs or outputs can be disregarded in other
systems.
∙ For use with software other than EMC, make sure your software addresses
the correct I/O lines for step and direction as shown below. Sherline is
not able to provide assi
∙ We recommend at least an 800 MHz Pentium class computer or faster for
use with the frequency mode.
In operation, the power to the
motors will be reduced to half current after 3 seconds of inactivity. This can
be changed to 1/4 power with a jumper on H1.
DB25 pin out:
1 - Input from EMC (may be
ignored in other systems)
2 - X Direction
3 - X Step
4 - Y Direction
5 - Y Step
6 - Z Direction
7 - Z Step
8 - A Direction
9 - A Step
10 - NC
11 - Output to EMC (may be ignored in other systems)
12 - Output to EMC, XYZ home (may be ignored in other systems)
13 - NC
14 - Input from EMC, C1 (may be ignored in other systems)
15 - NC
16 - Input from EMC, C2 (may be ignored in other systems)
17 - NC
18-25 - Ground
Headers on PC board:
H1 - Will reduce current to 1/4
after 3 seconds
H2 - Unimplemented H3 - Will remove power from drivers immediately (panic stop)
RESET - Will hold the drivers in reset condition
Motor Connectors:
∙ 5-pin DIN male
∙ Five to 30 volts (better performance at higher voltage)
∙ 2 amp unipolar configuration
∙ 800 steps per revolution (microstepping), equates to 16,000 steps/inch
with .050" pitch lead screw
In Figure 1 below, wire colours
of the 8-wire SKC brand stepping motors are shown. Figure 2 shows pin layout
and wire colours for the 6-wire NMB brand motors now used by Sherline. Other
brands of motors may use other colours.
(A) - Coil A uses the black and
green wires with black/white and green/white as the centre tap.
(B) - Coil B uses blue and red wires, with blue/white and red/white as the
centre tap.
Figure 1—(Above) Shinano Kinshi Motor and plug colour codes for 8-wire
motors.
Figure 2—Sherline NMB six-wire motors have only two wires from the
centre taps, and the colours are different. For 6-wire motors, the order would
be (counter clockwise starting at upper left): Yellow, red, black + white,
orange, brown. Again, this view shows the connector from the back side where
the wires would be soldered on.