This week-end I had more time to play with my Shapeoko, I mean, continue the build. I know, I have drawn the Shapeoko "Hello World!", but that doesn't mean the build is over. Far from it.
Last Friday I noticed an "official" limit switch kit on Carbide's store. While I find it simple and effective, I was wondering about the clearance between the M5 spacer and the wheel on the Y axis. Using a thin and long M5 spacer, one I got at Openbuilds, I affixed the spacer on the Y axis and I found the space between the wheel and the spacer itself to be quite small. While there is space and the kit will work without problems, I'd love a little more spacing. I'd move the holes on the Y axis plate a good 5mm higher to ensure clearance, and to make sure if the machine rams the limit switch, no damage to the wheels would occur. But that is just me, the kit is fine.
Carbide's kit is obviously for homing, but I know limit switches can be plugged in parallel and serial, as demonstrated in an easy to understand pictorial here:
http://www.hobbycncaustralia.com/Instru ... Switch.htm
Then I thought why not trying to use 2 limit switches per axis. This is what I came up with:
(nice place for a logo, hey!)
And the business end:
As you can obviously see, I tried to kill 2 birds with one stone here. A dust cover and the X end, and a limit switch holder.
Now, I will have to wire the end switches (parallel vs serial) and see if indeed 2 switches can be used per axis. All I have are Dupont connectors, the same you would use on a PC motherboard headers. The seem to fit the grbl board, but man, there are a tight fit.
I used regular 3D printer limit switches and added a PG-7 cable gland to have a nice and cheap cable stress relief. The 3D printer limit switches might not last long in the dust, but I paid 8$ for 30 of them so, there are cheap enough to replace.
If I succeed with my wiring tests, I'd print a second cover (while fipping it in the design), then use XTC-3D to add a nice finish to the boxes and paint them black.
Anyone tried to wire 2 limit switches on Carbide's grbl board yet ?
Any help would be appreciated.