Homing switch wiring for xxl confusion

[drummer412]

The muttering started when I told her she would have to help me move it (jokingly, of course). My idea of amusement is apparently different than hers.

[WillAdams]

I have the same problem --- fortunately, also a 17 year old son --- and in the next year or so will have to mount his XL on a dolly for outside cutting.

[drummer412]

Just noticed the control board featured in the Carbide homing switch document is different than the one on my machine. Do the homing switches plug into spots labeled X Limit, Y Limit, and Z Limit? I thought homing and limit switches were different.

[RoguePirin]

Yes, they plug into the limit switch spots. Limit and homing is functionally different, but your switches actually pull double duty on the Shapeoko. The limit switches for back (Y-Axis), right (X-Axis) and all the way up (Z-Axis) are also where the machine homes to.

[WillAdams]

Yes, they plug in there.

Homing / limit switch terminology is a bit strange. Fundamentally the same, the differences are:

- homing switches only exist at one corner and are used to determine the initial machine position
- homing switches may be used to enable soft limits which sort of allow them to be termed limit switches (stretching here...)
- limit switches exist at one or both ends of a machine's travel and sound an error if hit during operation --- they may also be used at one corner to determine home (at a certain safe offset from them --- on the Shapeoko the default for that is 5mm, I believe)

More on the wiki of course: http://www.shapeoko.com/wiki/index.php/ ... t_Switches

[drummer412]

As far as I know, I have everything set up correctly and will run the Hello World program tomorrow. Here's hoping for a smooth first run!

[harlji]

I just built my shapeoko XXL last might and had the same issue with wires not being long enough. I undid wiriring and re-did the wiring several times before I noticed in the instructions "Remove 12 links" turns out the drag chain was too long, you need to take off 12 of the links from the y axis drag chain. All the wiring should be long enough. I misinterpreted these instructions ...I thought it meant removing the 12 covers from the drag chain to expose the wiring.

[WillAdams]

Yeah, the instructions could use some work (we're working on a new set).

remove 12 for the XXL and 20 for the XL --- I've updated the wiki on this.

EDIT: had numbers reversed

[drummer412]

I never saw anything about 20. I only removed 12 for my XXL and it seems to be working fine. Should I remove the other 8 or just go as is?

[WillAdams]

No, I should type the right thing. Fixed.