Difference between revisions of "Shapeoko CNC Router"
(→DC motor speed controller)
(Fix equipment image)
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|Image=:Shapeoko 2 on the 20th of July 2015.jpg
|contact=CNC area Warden
|contact=CNC area Warden
Revision as of 18:34, 16 January 2016
|List of All Documented Equipment|
|Hive13 Asset Tag: None|
|Make/Model: Shapeoko 2 (google)|
|Arrival Date: 07/2014|
|Does it work?: no|
|Certification Needed?: yes|
|Contact: CNC area Warden|
Hive13 was selected by Inventables to receive a Shapeoko 2 (very awesome of them)! We received the unit around the beginning of July 2014. Two build nights were hosted and semi documented under Project ShapeOko. Julien Morand took over building and improving much of the ShapeOko and is currently maintaining it (as of Oct 2014).
How to Use
Step by step
- 1 start the PC
- 2 turn on the 24 volts power supply by lifting the emergency switch
- 3 start GRBL controller
- 4 connect to the arduino board by hitting the connect button
- 5 start the homing process by typing in the command bar $H. The Z axis should move up first then the x and y axis.
- 6 once the homing is finished, move the spindle to the origin of your part by using the arrows on the screen or the command bar
- 7 type in the command bar G92 x0 y0 z0 to set the relative origin.
- 8 load a G-code file and start your job!
The shapeoko controller has to be compatible with the grbl firmware. Here is a little of compatible software:
Right now, the used software at the hive is GRBL controller  from zapmaker. When you have generated a G-code file with favorite CAD to CAM software (CAMBAM, MeshCAM...), you will use the (GRBL) controller to send the coordinates to the Shapeoko.
Prior to any machining, you have to set up the origin of your part.
The choice of the bit, the spindle rotation speed, feed rate and plunge rate require knowledge ans experience. Choosing poorly one of this parameter could damage the machined part, the bit or even the CNC machine.
If you don't know what are you doing or you need confirmation, don't hesitate to ask!
2 June 2014
Hive13 is announced as a winner of a ShapeOko 2 from Inventables! Yay!
9 July 2014
Project ShapeOko commences and the ShapeOko is built
30 Sep 2014
New spindle was mounted and in the middle of its first test cut when the electronics died. Currently ordering new stepper controllers in an attempt to repair it.
11 November 2014
The shapoko is working again. A new Gshield has been bought. A first part has been successfully done.
13 January 2015
The shapoko is down for upgrading. Here is the list of the upgrades:
- 1 the controlling software will new be LinuxCNC (). It required an parallel port connection. A parallel port break out board has been bought for this purpose.
- 2 the spindle speed will be controlled directly by the software via the parallel breakout board
- 3 the spindle ON/OFF will be controlled directly by the software
- 4 the z axis will be upgraded with the ACME upgrade ()
The ETA on these operations is on the 20 th of January.
14 February 2015
27 March 2015
The Z axis bet drive upgrade is now installed. A T-slot aluminum board have been installed (Thanks to Jim). The next target upgrades are:
- 1 Rewire the machine with shielded cable to move the control boards on a box outside of the machine.
- 2 Add mechanical limit switches for homing
- 3 Add the relay board to turn ON & OFF the spindle, the spindle speed will be controlled directly by the software. The PWM output is coming from the arduino board.
- 3 Add a mounting part for the supereyes borescope for using it as edge finder.
- 4 Replace the mechanical limit switches to hall effect sensors.
27 July 2015
The stepper motors have been rewired using shielded cables. The limit switch boards are now mounted on the machine and connected to an interface boards. The homing is now possible on the machine. The set Arduino+Grbl shield is now in a new enclosure with the 24 volts power supply and the interface board. the next upgrades will be:
- moving the components of the PC in the new enclosure to have only one box for the control of the machine.
- weld the steel structure fro the Shapeoko (waiting on Kevin Shuler availability)
- move the DC speed controller in the enclosure.
- print the cable chain holders for X and Y axis (Gigabot is down)
- add a support for the X axis for the cable chain
The limit/homing switches are Hall effect sensors. The boards are available in the shared projects section of OSH park. There are two boards for the x and y axis (4 total) and one for the z axis. Each board is supplied by the Arduino (+5 Volts). During normal operation the output of the sensors is pull high by the hall effect sensor. When the magnet is placed in front of the sensor, the output is pull to 0 Volts. The hard limit and homing needs to be enable on the GRBL software ($21=1 and $22=1).
the schematic can be found here:File:Homing switch.pdf
Since the connection with the Arduino board is not very easy (euphemism), a board has been made to interface the signals coming from and to it. The current version of this board is using 3 position connectors to connect the limit switches. The cable used for the limit switches is microphone cable. So, the next version of this board will use XLR connector to improve the noise immunity (shielded connector) and make easier to plug in. the link with the Arduino made by a 10 position connector  and an adaptor to fit on the pin of the GRBL controller. The wiring schematics is the one use for GRBL 0.9 
DC motor speed controller
The speed of the DC motor can be controller by a driver from RioRand. The 48 Volts power supply is modulate by PWM to get an average voltage on the motor and therefore set the motor speed. A 100 Kohms multiturn potentiometer has been added to set manually the speed. An additional input (PWM1-2) is also available to directly controlled the speed on your G-code using the the M3,M4 and M5 commands. For example, M3 S1000 will make the motor turn clockwise at 1000 R.P.M. For now only the clockwise rotation is possible.