Notice
- This machine should not be operated without induction.
- This machine should not be left unattended during operation.
8’ x 4’ CNC Machine
Details
Working Area:
Y: 2500mm
X: 1250mm
Z: 100mm standard
(220mm without machine bed)
Clamping table [mm]
2440 x 1220
Footprint:
Length: 3100mm
Width: 1900mm
Height: 1700mm
Accuracy:
+/- 0.05mm over 2500mm
Spindle:
2.2kW Water Cooled Spindle (7,200 - 24,000 RPM), ER20 Collet-Holder
Brand & Model: Marchant Dice (Bionica Systems) MD-MW01 (both companies now defunct)
The machine is suitable for milling, boring, cutting, engraving, proportioning, metering, positioning, and many similar applications on a large scale.
Condition Notes
Purchased 2nd hand - March 2019 supposedly in working condition. Setup and recommissioned early 2022.
Risk Assessment
8x4 CNC Machine Risk Assessment
Induction and Training
Prerequisite is being inducted on the Desktop CNC machine
There is no ‘waiting list’ to be inducted on the Big CNC - when you believe you are proficient on the Desktop CNC and have done a couple of projects end-to-end then send a private message (PM) to @CNCtechs to arrange an induction on this machine.
The software and design process is identical to the Desktop CNC, the differences are as follows:
- Risks & Risk assessment - it is not in a protective housing
- Spoilboard surface instead of T-slot plate
- Hold downs
- Shuttle controller for touching off
- Spindle VFD control
- Power on / off
Maintainers
Before Use
Coming soon.
During Use
WIP checklist:
Spindle RPM set before job start
Retract height will clear clamping
After Use
Coming soon.
Fusion 360 Files
Fusion360 - Machine Settings and Tools Library - Q2 - 2023.zip (4.6 KB)
Please note that there might be new or different tools available.
VCarve Files
big_CNC-tooldatabase-07042024.vtdb (180 KB)
Please note that there might be new or different tools available.
Maintenance
@cnctechs only
VFD Setup:
| Param | Value | Explanation |
|---|---|---|
| PD005 | 400 | Max Operating Frequency (Hz) - set first |
| PD001 | 1 | Source Run Commands: External (computer instead of run button) |
| PD002 | 1 | Source of Operating Frequency: External (pot) |
| PD003 | 400 | Main Frequency (Hz) |
| PD004 | 400 | Base Frequency (Hz) |
| PD006 | 2.5 | Intermediate Frequency |
| PD007 | 0.5 | Min Frequency |
| PD008 | 220 | Max Voltage |
| PD009 | 13 | Intermediate Voltage (guide 15) |
| PD010 | 6.5 | Min Voltage (guide 8) |
| PD070 | 1 | Analogue Input: 0-5V |
| PD072 | 400 | Analogue Frequency Max |
| PD073 | 120 | Analogue Frequency Min |
| PD141 | 220 | Rated Motor Voltage |
| PD142 | 11 | Rated Motor Current (A) |
| PD143 | 4 | Motor Poles |
| PD144 | 3000 | Rated RPM (at 50Hz) |
https://www.kronosrobotics.com/hy02d223b-vfd-type-1
https://www.cnczone.com/forums/spindles-vfd/117782-huanyang-chinese-vfd-settings-manual-7.html
Settings we use for our 2.2kw spindle:
PD005 through PD010 set three points on a voltage/frequency curve. As the motor ramps up to your desired speed, it follows this curve. The manual usefully shows three types of curve: constant torque, low torque, and high torque. I’ve set mine to the values for the constant torque graph (why not).
PD004: Rated frequency: Apparently this is for motors with a fixed frequency. Since the spindle is variable frequency, this setting can be ignored.
When PD002 is set to 1, there is also a jumper next to the screw terminals that you have to set. If the jumper is on the right pair, the control is the front panel knob. If the jumper is on the left pair, the control is via an external potentiometer connected to the screw terminals. Make sure the jumper is on the right-side pair.
PD006: Middle frequency: 2.5 Hz
PD007: Low-end frequency: 0.5 Hz
PD008: High-end voltage: 220 V
PD009: Middle voltage: (15 V in guide)
PD010: Low-end voltage: (8 V in guide)
PD070: Speed control input: Set to 1. This means that the speed will be controlled by an input voltage between 0 and 5V. This is what the front panel knob delivers. 0 means 0-10V. 2 means the control is by an input current between 0 and 20mA. 3 means 4-20mA. 4 is a combination of voltage and current.
PD072: High-end frequency: Set to 400. This sets the frequency represented by the top end of the speed control.
PD073: Low-end frequency: Set to 120. This sets the frequency represented by the bottom end of the speed control.
PD141: Rated motor voltage: Set to 220V.
PD142: Rated motor current: Set to 11A. Why not 10? Because there will always be some loss in the spindle cable. This compensates for that. But feel free to set it to 10A. The worst that can happen is that your motor loses power at the top end.
PD143: Number of motor poles: Set to 4. This is the number of magnetic poles in the motor. It should be either 2 or 4, and is 4 for the 2.2kW spindle.
PD144: RPM at 50Hz: Set to 3000. Since the max RPM is 24000 at 400Hz, this means that the RPM at 50Hz will be 3000.
References
Paperwork that came with it:
Marchant Dice MD-MW01.PDF (3.1 MB)
Original Website:
Original Videos from Marchant Dice (NOTE: Some may be different than ours):
Homing