Kuman Professional 3D printer CNC Kit for arduino, GRBL CNC Shield +UNO R3 Board + RAMPS 1.4 Mechanical Switch Endstop + DRV8825 A4988 GRBL Stepper Motor Driver with heat sink + Nema 17 Stepper Motor
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- Latest CH340G CNC Shield expansion board Version 3.0 for Arduino
- Kuman UNO R3 Board, MCU: ATmega328, USB interface: ATmega16U2 with 1.5m USB Cable
- 4pcs DRV8825 Stepper Motor Driver with heat sinks
- 3pcs NEMA-17 Stepper Motor 84 oz.in (59 Ncm) 47mm Body 1.8 degree with mounting Bracket Kit DIY 3D Printer CNC Robot with 3pcs Mounting Bracket and 12 pcs M3 Screws
- 3pcs Endstop Mechanical Limit Switches for 3D printer RAMPS 1.4 with 3Pin 70cm Cable
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CNC Shield Board:
Latest CNC Shield Version 3.0 for arduino
GRBL 0.9 compatible
4-Axis support (X, Y, Z , A-Can duplicate X,Y,Z or do a full 4th axis with custom firmware using pins D12 and D13)
2 x End stops for each axis
Compatible with A4988 or DRV8825 stepper driver
Runs on 12-36V DC
DRV8825 Stepper Motor Driver:
Stepper motor driver (upgraded from A4988, 2.5 A max current/phase. It's not arduino official board but it's compatible with all arduino software and hardware)
Nema 17 Stepper motor Specification:
Step Angle: 1.8 deg.
Holding Torque: 59Ncm(84 oz.in)
Rated Current/phase: 1.7A
Frame Size: 41 x 41mm
Body Length: 47mm
Shaft Diameter: 5mm
Shaft Length: 22mm
Mechanical Endstop Connection description:
Red line connect VCC (ramps of +)
black wire connect the GND (ramps of -)
Green Line connect SIGNAL (ramps in s)
Tips: Under normal circumstances, the system must be configured to at least three mechanical switches.
Advantage: Easy to install, the more common used styles
Length of Cable: 70 cm
1 x CNC Shield Board
1 x Kuman UNO R3 Board
4 x DRV8825 Stepper Motor Driver
4 x Aluminum heatsink w/ 3M tape backing
3 x Nema 17 stepper motor 1.7 A (with bracket and screw)
3 x Nema 17 Stepper Motor Mounting Bracket
12x M3 Screws for bracket of stepper motor
3 x Mechanical Switch Endstop
3 x 3Pin 70cm Cable
1 x 1.5m USB cable for R3 Board
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ORIGINAL: Basically no manual or other documentation from the manufacturer. The board appears to be a genuine shield, but it's version 3.00, while 3.02 came out pretty quickly after this was released, and 3.51 is the current version, at the time of writing this. It wouldn't be so bad if Kuman included instructions, but the documentation online is rather sparse for 3.00, and it's taking a lot of trial and error to get mine working. For instance if I wire the endstops as is suggested for these, hitting one turns the entire rig off. Pulling the +5v, which appears to only kill the led on trigger gets rid of the shut down, but, the switch does nothing now. 3.02 added a jumper to change the behavior of the switches, and it's not clear how that affects the wiring.
Three end stops is annoying .. if you want switches on both ends you have to get another 3, or do something tricky with a cam/lever to actuate. (EDIT 9\25: this may be somewhat standard, I'm new to CNC - but - I think I read they often only run them on one end, perhaps the - direction?)
No jumpers to configure things on the cnc shield is also annoying.
All of that said -- I'm close to having a fully functional, if a bit rough, cnc for around $250, and this kit is a big part of that.
All the pins are marked on the board, some on the stepper drivers themselves, so connecting higher amperage remote drivers is easy. I did not need the little drivers included in the kit. Not marked is the probe input, which should be A5.
Note that the limit switches are the same pin connections for X+ and X-, Y+ and Y-, and Z+ and Z- (total of three arduino inputs) so you have to set the GRBL code for dual switches in parallel.
Also Arduino GRBL only supports three axis control, and the board A output can only be slaved to one of the X, Y, or Z step and dir outputs. There is only one enable pin so it is shared, if you use it at all. You don't need it for basic control of steppers.
I had odd behavior of the driver RUN led when +5 was connected in common with the EN driver input. Removing it and having +5 only connected to the STEP and DIR inputs cleared it up.
Strang behavior of stepper motors when they were laying on the bench free and trying to run, sometimes it would stop mid run but cleared up when holding (restraining ) the motor. I assume it has something to do with the motor frame kicking back instead of turning the rotor. Don't condemn the drivers if you see this quirk.
The touch screen can't be used together with the control board mounted on the Arduino. You'll use a PC or laptop instead of the screen anyway.
I heard the usb controller chip might need a firmware update to fix some response errors, but that is a generic Arduino problem when running GRBL.
In the end the control board is like a breakout board when you don't use the included driver chips, but that is invaluable for knowing which pins are which.
Update 1/3/18 I got the touch screen working on a spare Arduino.
I had some issues setting up the system following the instructions but finally made the system work, basically my own mistake but it took a lot of YouTube and google search to competed, so a better instruction would help a lot.
Another area for improvement is to used physical stops for the Vref potentiometer is difficult to set the reference voltage initially