I’m building a Large OX from @SMW3D and I have a TinyG control board for it. I’d like to add min+max limit detectors on the X and Y axes. I was thinking I’d like to use induction sensors. Has anybody else done this? If so, do you have a preferred sensor? Links to your source for it? Also, pictures and/or links to mounts? I have a 3D printer so I could print mounts while I’m getting the rest done, but models for use with the CNC would be great, too. TIA.
Never used induction sensors, but I’ve seen others use them successfully. They’re cheap in bulk from China too.
With the use of standard (nc) limit switches on the min on the x&y and max on the Z, used as homing switches, that’s all you really need. It’s real easy to set up, in the congifuration of the tinyG you to input the max length of travel for each axis and use the soft limit option. This means the switch will stop the axis and rebound it to the home positions and the software setting of (soft limit) makes sure the head only travels the maximum length defined. This makes sure your machine won’t crash an axis.
Truth be told, these belt and pully setups won’t really break anything if you do happen to crash an axis. the rubber belt gives, and it’s just skips, so you really don’t have to set up limit switches. just remember to push the head to the home positions before you turn on the machine this will become x0,y0, z0 and you can enter g code to send the head back to 0 when ever you want, just dont use the home buttons.
I will be filming a homing switch setup tutorial tomorrow, give me a few days to get it up on the web… T
+Peter van der Walt that looks a lot like the PS-05N. I already have one because I was going to use it on my old Printrbot+ re-work. It sounds like I could just use that. I couldn’t find the diode config you mentioned–could you please provide a link? On that note, I have some jelly bean transistors lying around (2N3904 & 2N3906)–could I just use some of them as diodes and call it good?
Oops. Meant to include a link to the unused sensor I have now:
http://www.amazon.com/gp/product/B00FZUECJA
@Thomas_Shue please let me know when you have your video up. It sounds helpful, thanks!
Also I have the switch .stl too
+Peter van der Walt I looked at the file and couldn’t find this sensor circuit, but @Michael_Jacobsen 's recent circuit image post will be sufficient, I think. Side note: I didn’t know I could use Eagle CAD! Looks like it is pretty powerful. But I am not currently an EE, so my use of it will probably be minimal for now.