Thread: Which Type of Limit Switch
Hybrid View
-
12-07-2014 #1
Optical or proximity would work, difficulty with either, on a mill as opposed to a router, is finding somewhere they can be kept clean and dry. Also where is 'home' on a mill? nominally its the centre of the table (as opposed to one corner on a router). Mach3 homing is to detect the homing switch change of state then back off til it changes back again. a bit tricky to do for the middle of the table.
-
13-07-2014 #2
Is this any use ? it might solve the issues Irving rightly brought up.
http://www.cnccookbook.com/CCMillCNCHomeSwitches.htmLast edited by EddyCurrent; 13-07-2014 at 10:36 AM.
Spelling mistakes are not intentional, I only seem to see them some time after I've posted
-
14-07-2014 #3
-
14-07-2014 #4
If you use a proximity switch such as the LJ12A3-4-Z/BX, you will need a supply voltage of 6 to 36v. anything below 10v won't work reliably (I found to my cost). The advantage of this proximity switch is that it is a sealed unit, you just need to keep swarf away from the sensor end.
-
14-07-2014 #5
Which is tricky on a mill, also the mill itself is a big chunk of iron so mounting proximity switches so they're not affected isn't so easy. Optical sensors as shown in the link on Eddie's post in suitably sealed boxes are a neater solution. A suitable sensor is this one: http://uk.farnell.com/omron-electron...ive/dp/1348961
-
14-07-2014 #6
-
14-07-2014 #7
-
14-07-2014 #8
Many thanks for the explanation, this switch seems rather small, the spec sheet says it has a gap of only 3 mm, therefore i would need a piece of metal less than 3 mm thick to go through it, would this not be a bit flimsy for a robust milling machine? and also would this switch be ok powered by my ZP5A Breakout Board, which only gives out 5 volts? and does it wire directly to the BoB?
Ray
Thread Information
Users Browsing this Thread
There are currently 3 users browsing this thread. (0 members and 3 guests)
Similar Threads
-
Limit switch issues?!?
By jonbabbz in forum General ElectronicsReplies: 10Last Post: 06-02-2014, 07:37 PM -
Another Home - Limit switch question
By Cube3 in forum General ElectronicsReplies: 6Last Post: 26-12-2013, 07:51 PM -
One limit switch per axis
By EddyCurrent in forum General ElectronicsReplies: 17Last Post: 30-09-2013, 11:38 AM -
Limit switch Cable ...
By Wobblybootie in forum General ElectronicsReplies: 3Last Post: 17-01-2011, 04:37 PM -
Limit switch's - best configuration?
By HiltonSteve in forum General ElectronicsReplies: 16Last Post: 13-08-2009, 01:26 PM
Bookmarks