RepRapPro Huxley commissioning
| Introduction | Frame assembly | Y axis assembly | X axis assembly | Z axis assembly | Heated bed assembly |
| Extruder drive assembly | Hot end assembly | Wiring | Commissioning | Printing | Troubleshooting |
Contents
Goal
By the end of this stage, your machine will be ready for its first print.
Tools
- An object with a measured height (we use a length of 6mm diameter silver steel)
Step 1: Communication
Before you start trying to talk to your machine, you need Python and the dependencies. If you know how to do this, you can install the dependencies listed here. If you need more instructions, go to the link below and follow the instructions (4 items to download and install in order for Windows):
https://github.com/kliment/Printrun/blob/master/README.md
And go here for Windows 7:
http://www.emakershop.com/forum?vasthtmlaction=viewtopic&t=238
You may need to go into the pyreadline-1.7 folder and click setup, which will made a command window pop up for a moment; this may or may not be needed.
The first thing to establish is that you can communicate with your machine. You will need to install and run the RepRappro Pronterface software, which you will find in our github repo here. The button to download a ZIP file is near the upper left.
Connect your RepRapPro Huxley to a USB port on your computer, then run pronterface.py and select the active serial port in the upper left. Click Connect, wait a moment, and the software will confirm when the printer is online.
Press the GET POS button, and if the machine returns a position of X0.00 Y0.00 Z0.00 your serial communication is functioning correctly.
NOTE: If your pronterface window does not display the custom buttons (GET TEMP, GET POS, ... ), you most likely have another copy of .pronsolerc in your home folder. Delete this file and reload the software. You should now see the extra buttons.
Step 2: Axes
Motor movement
DO NOT CONTINUE WITHOUT CHECKING CURRENT LIMITS!
If limits are not set, the driver boards will most likely be destroyed.
You should already have done this when you installed the electronics, but now is the time to double check:
The current to each motor is controlled by the miniature potentiometer (or trimpots, circled below) beside the stepper-driver chips on the left of the controller board. Use a small screwdriver to turn each one fully anticlockwise (don't force them - they should turn freely). Then turn them clockwise by about 30o.
Using a multimeter, tune the trimpots to provide 1Amp to each of the stepper motors. The trimpot dial is connected to the REF pin on the A4988 stepper driver ic. The Huxley's stepper motors are rated to 1Amp, which equates to 0.4v on the REF pin of the A4988 stepper drivers. You can connect the ground probe (usually black) of you mutlimeter to the GND pin of the power input screw terminal (the green terminal circled above), and connect the positive probe (usually red) to each of the trimpot dials in turn.
Now type:
G1 X5 F500
in the field below the log window and click Send. The X-motor should move to 5mm in the positive direction (X5) at 500mm/min (F500).
Now type:
G1 X0 F500
and send. The X-motor should move back to its starting location (X0). If you find that your machine will not move in the negative direction, your endstops are probably not wired correctly. Refer to the wiring page to check your wiring.
Repeat the above test for the other three axes. For each axis test, replace the X in the above command with the relevant axis letter (Y,Z,E), but for Z make the feedrate 200 mm/minute:
G1 Z5 F200
You may find that some axes judder, or whine but don't move. This means that their current is set a little too low.
Turn off the power, then rotate the appropriate potentiometer just a little clockwise. Put the power back on and repeat the tests above.
Endstops
To test the endstops, repeat the above test for the X, Y and Z axes in turn, this time with a much slower feed and a larger negative distance, for example
G1 X-20 F100
As soon as you press Send and the axis begins to move, activate the relevant limit switch to halt movement of the axis. If activating the switch does not halt your axis, check your wiring.
Homing
You are almost ready to home your machine. Before doing so, ensure the Z endstop is high enough on the Z smooth rod to trigger the switch without the head ploughing into your heatbed.
Press the HOME ALL button and your machine will find its reference position at X0 Y0 Z0.
Step 3: Alignment
Level the X axis
A 150mm steel rule is best for this step. Place the rule on top of each X end in turn and measure the distance to the Z motor mount. Rotate the Z motors until both X ends are the same distance from their respective Z motor mount.
Level the bed
One of the major differences between the standard pronterface and the eMAKER version is the way the machine is manually controlled. You have five buttons which enable you to position the head above the four corners of the bed and over the centre. The Z axis can be moved in increments of 0.1mm, 1mm and 10mm. The E axis can be moved by the amount specified in the distance spin control. The speed of manual moves can be specified in the spin controls above the manual move buttons.
To level the bed, move the head up such that you have at least the height of your measured object between the head and the bed. Then position the head in the centre and bring it down gradually until it is almost touching the object. Moving the head to each corner, adjust the three M3x30mm cap head screws by which the heatbed is mounted in order to level the bed. The nuts on the M3 screws need to be tight against the spring mounts.
After you have leveled the bed you should add a drop of superglue to the outside of each of the levelling nuts to minimize the shaking as the bed moves. Its actually good if some gets into the threads; you can still adjust be bed height, but it won't creep around by itself.
Set your Z height
With the head at Z0, the tip of the nozzle should be within a paper thickness away from the surface of the bed. To achieve this, follow the sequence:
- HOME ALL
- Send the following command: G1 Zz F200, where z=the height of your measured object.
- CENTRE
- Check that the head is within 0.3mm of your object.
- Adjust the height of the Z axis endstop, and repeat until your height is set.
Step 4: Heaters
Command the heatbed to 45C (warm), tick the monitor checkbox and verify that the heatbed temperature reading rises and stabilises around 45C, and that the heatbed is actually warm.
