[Blabber] Desktop CNC mill

Gmail rotabush at gmail.com
Mon Mar 12 23:03:07 EDT 2012


I might have my personal 25 cable stored at work. Will check tomorrow and bring it down if I have it

Sam

On Mar 12, 2012, at 10:31 PM, Guan Yang <guan at yang.dk> wrote:

> Our desktop CNC mill has arrived and Daniel and I have played around a little with it. He will post a few photos and videos later. 
> 
> It is currently installed right next to the desktop computer which we have moved because we didn't have a DB-25 cable, so the electronics are plugged in directly. We need a DB-25 male-to-female cable like this:
> 
> http://www.amazon.com/Cables-To-Go-02656-Extension/dp/B00006HSJH/
> 
> Does anyone have a spare? If not we will order one.
> 
> I may not be in tomorrow night, so here are some instructions:
> 
> There is a CD in the desktop which is the live CD for the special RTLinux LinuxCNC/EMC2 version of Ubuntu that is required. You can use the wizard to set up LinuxCNC according to the instructions. Note that we are using a PCI parallel port so the default 0x378 I/O address for the parallel port address is incorrect. Find it in dmesg; when we tested it, the address was 0xcf00.
> 
> - Z axis direction needs to be inverted (it's not in the manual)
> - Remember to invert all the digital outputs! They're actually the enable pins.
> - Don't forget the 0.4 in/s maximum speed on each axis.
> 
> Note that the maximum Z height is 0, which should be homed for just above the workpiece. If you just mill the standard EMC2 logo, after homing Z (and the other axes), use the Touch Off button to indicate how far down you want the tool to go. Type in a *positive* value, for example 0.25 for the tool that's currently mounted.
> 
> When moving the toolhead manually in the GUI, remember that you can change the speed with a slider.
> 
> If you follow the manual and don't invert the X and Y axis directions, beware what's home and what direction it will go. In the photo, I have indicated the X and Y directions of the tool on the workpiece; the actual bed will go in the opposite direction. Also note that the designers of this mill don't have the same idea of X and Y as the rest of us. The big blue dot indicates where you would put the origin of the coordinate system.
> 
> There is a knob on the rotary tool that is used to set the speed. The tool should actually be turned on and off inside LinuxCNC/EMC2.
> 
> The wires are currently not routed in a very good way. If you are going to be using the mill a lot, feel free to do some good routing, and cut off / add any zip ties you want.
> 
> It would be great if someone would resize the existing file system so we can install the LinuxCNC version of Ubuntu permanently.
> 
> The parallel port wires from the ribbon cable are really too thin for the screw terminals. Sometimes they come loose. Daniel added a dab of solder to one of them.
> 
> If I'm not in I will probably be available on email or text or irc. 
> 
> <photo.JPG>
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