YoraHome 6550 User manual

32-BIT CONTROL BOARD INSTALLATION
Version 1.0 • September, 2022
YORAHOME CNC LASER ENGRAVING MACHINE 6550

Purpose
This Manual is intended for retrofitting the 32-Bit Control Board to the
YoraHome CNC Laser Engraving Machine 6550; replacing the original 8-Bit
Control Board.
This manual is designed to cover this process only, and is not a complete
manual.
Before beginning assembly, we recommend conducting an inventory using
the Packing List to ensure all components are present.
Please read these instructions carefully before installing your board to
prevent possible damage to your machine.

Contents
Part 1: Packing List
Part 2: Assembly
Part 2: Default GRBL Settings

Packing List 1/3
Part 1
Item Size Picture Quantity
32-Bit Control Board 1
Rear Acrylic Mounting Plate 4mm Thickness 1
Front Acrylic Mounting Plate 4mm Thickness 1

Packing List 2/3
Part 1
Item Size Picture Quantity
USB Cable 1
Cooling Fan 30x30x10 - 12VDC 1
Fan Mounting Pins White Nylon 4

Packing List 3/3
Part 1
Item Size Picture Quantity
M3x6 Socket Head Screws
NOTE - Extra hardware is
included in this kit; in the
event of loss.
5
M3x8 Socket Head Screws 5
M3x6x6 Board Standoffs -
M/F threads 5
M3x13 Board Standoffs - F/F
threads 5

Assembly
Part 2
Preliminary Steps
- For ease of access, position the 6550 with the Control Board facing you.
- After setting position; ensure that the Controller is turned off, and the power cord
unplugged.
- Ensure that your work area has ample room around the machine to allow room to
work.

Assembly
Part 2
Step 1 - Removal of 8-Bit Control Board 1/3
Disconnect all wire harnesses from the
control board:
- X Axis Stepper Motor
- Y Axis Stepper Motor
- Laser
(It is recommended that you temporarily
label at least one of the stepper motor
wire harnesses, to prevent errors on
reassembly)
NOTE - Photos used in this manual show a
machine equipped with Dual Y Axis
motors; your machine may only have one
Y Axis Stepper Motor

Assembly
Part 2
Step 1 - Removal of 8-Bit Control Board 2/3
Using the appropriate hex key (included
with your original machine purchase),
remove the 4 screws holding the Front
Acrylic Plate over the control board.
Remove the brass standoffs which are
retaining the control board to the Rear
Acrylic Plate, and remove the control
board.

Assembly
Part 2
Step 1 - Removal of 8-Bit Control Board 3/3
Remove the 2 screws holding the Rear
Acrylic Plate to the machine frame.
KEEP THESE 2 SCREWS AND T-NUTS FOR
INSTALLATION OF THE NEW CONTROL
BOARD.
We recommend retaining the original
control board and all associated mounting
hardware, as a reserve/spare part.

Assembly
Part 2
Step 2 - Preparation of 32-Bit
Control Board 1/6
Carefully remove the protective
paper covering from the Front Acrylic
Mounting Plate and Rear Acrylic
Mounting Plate.
Careful use of a small flat screwdriver
or knife may help with removal of the
protective paper.

Assembly
Part 2
Step 2 - Preparation of 32-Bit
Control Board 2/6
Using the M3x6 Screws and M3x6x6
Board Standoffs; secure the standoffs
to the Rear Acrylic Mounting Plate, as
shown.
NOTE - Be sure to use the inner-most
holes for mounting the standoffs.

Assembly
Part 2
Step 2 - Preparation of 32-Bit
Control Board 3/6
Carefully place the new control board
on the standoffs, ensuring that there
is no part of the bottom of the
control board contacting the Rear
Acrylic Mounting Plate.
Using the M3x13 board standoffs,
secure the control board to the Rear
Acrylic Mounting Plate.

Assembly
Part 2
Step 2 - Preparation of 32-Bit
Control Board 4/6
Using the M3x8 screws, secure the
Front Acrylic Mounting Plate over the
control board.
Ensure that the hole in the Front
Acrylic Mounting Plate is properly
positioned to allow access to the
control board power switch.

Assembly
Part 2
Step 2 - Preparation of 32-Bit
Control Board 5/6
Position the Cooling Fan over the
opening in the Front Acrylic
Mounting Plate.
NOTE - Ensure the fan is installed
with the support frame facing out, as
shown, and that the wire harness can
reach the connection on the Control
Board.
Press the Fan Mounting Pins through
the Cooling Fan housing and into the
Front Acrylic Mounting Plate to
secure the fan.

Assembly
Part 2
Step 2 - Preparation of 32-Bit
Control Board 6/6
Plug the Cooling Fan wire harness
into the provided connector on the
Control Board.

Assembly
Part 2
Step 3 - Install Control Board to
Machine Frame
Using the 2 Screws and T-Nuts
removed in Step 1 (3/3); mount the
new Control Board assembly to the
Machine Frame as shown.

Assembly
Part 2
Step 4 - Wiring Connections
Connect the wire harnesses to the
respective ports on the Control
Board, as shown.
- X Axis Stepper Motor
- Y Axis Stepper Motor
- Laser
The remaining connectors on the
control board will not be used at this
time.
Reconnect power supply, and
connect to computer using provided
USB Cable.
Laser X Axis Y Axis
Power
USB

Default GRBL Settings
Part 3
$0=3 (Step pulse time)
$1=254 (Step idle delay)
$2=0 (Step pulse invert)
$3=5 (Step direction invert)
$4=0 (Invert step enable pin)
$5=1 (Invert limit pins)
$6=0 (Invert probe pin)
$10=1 (Status report options)
$11=0.010 (Junction deviation)
$12=0.002 (Arc tolerance)
$13=0 (Report in inches)
$20=0 (Soft limits enable)
$21=0 (Hard limits enable)
$22=0 (Homing cycle enable)
$23=1 (Homing direction invert)
$24=500.000 (Homing locate feed rate)
$25=3000.000 (Homing search seek rate)
$26=250.000 (Homing switch debounce delay)
$27=1.000 (Homing switch pull-off distance)
$30=1000.000 (Maximum spindle speed)
$31=0.000 (Minimum spindle speed)
$32=1 (Laser-mode enable)
$100=80.500 (X-axis travel resolution)
$101=80.500 (Y-axis travel resolution)
$102=100.000 (Z-axis travel resolution - not used)
$103=100.000 (A-axis travel resolution - not used)
$104=100.000 (B-axis travel resolution - not used)
$105=100.000 (C-axis travel resolution - not used)
$110=10000.000 (X-axis maximum rate)
$111=10000.000 (Y-axis maximum rate)
$112=5000.000 (Z-axis maximum rate - not used)
$113=1000.000 (A-axis maximum rate - not used)
$114=1000.000 (B-axis maximum rate - not used)
$115=1000.000 (C-axis maximum rate - not used)
$120=1000.000 (X-axis acceleration)
$121=1000.000 (Y-axis acceleration)
$122=4000.000 (Z-axis acceleration - not used)
$123=200.000 (A-axis acceleration - not used)
$124=200.000 (B-axis acceleration - not used)
$125=200.000 (C-axis acceleration - not used)
$130=300.000 (X-axis maximum travel)
$131=300.000 (Y-axis maximum travel)
$132=300.000 (Z-axis maximum travel - not used)
$133=300.000 (A-axis maximum travel - not used)
$134=300.000 (B-axis maximum travel - not used)
$135=300.000 (C-axis maximum travel - not used)