Thread: Which Type of Limit Switch
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14-07-2014 #11
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
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14-07-2014 #12
These are the ones I used;
http://www.ebay.co.uk/itm/2pcs-SN04-...item5d38dcb5f5
Albeit on a router, they work well and are very repeatable. Because they are 3 wire NPN you can power them from a 24v supply but still connect the output to your 5v bob input where they either leave it open (high) or short it to ground (low).
The drawing here shows how they are connected; (bottom left corner of drawing)
http://www.mycncuk.com/threads/6565-...7622#post57622Last edited by EddyCurrent; 14-07-2014 at 05:39 PM.
Spelling mistakes are not intentional, I only seem to see them some time after I've posted
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14-07-2014 #13
Eddy beat me to it but there are these as well and bit cheaper. I use this sort of thing on my router and will be fitting them to the mill. You do have to watch out for swarfe but if they are mounted under the bed or have a cover over I don't see a problem.
Normally open http://www.ebay.co.uk/itm/TL-Q5MC2-I...item1c41faa863 or
http://www.ebay.co.uk/itm/New-LJ12A3...item53ffd022e5
Normally closed:- http://www.ebay.co.uk/itm/DC-6-36V-N...item417755e4ae and
http://www.ebay.co.uk/itm/4mm-Tubula...item43bbcedff7 Also
this :- http://www.ebay.co.uk/itm/DC-10-30V-...item43bbcddc3b ..CliveLast edited by Clive S; 14-07-2014 at 07:05 PM.
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15-07-2014 #14
Many thanks, I like the look of this one,http://www.ebay.co.uk/itm/New-LJ12A3...item53ffd022e5 i can easily fit these to my machine, my Bob is only 5 volt so do i need a relay? and how do i wire a 3 wire switch, can you do me a schematic, i'm not an electrician.
RayQUOTE=Clive S;60092]Eddy beat me to it but there are these as well and bit cheaper. I use this sort of thing on my router and will be fitting them to the mill. You do have to watch out for swarfe but if they are mounted under the bed or have a cover over I don't see a problem.
Normally open http://www.ebay.co.uk/itm/TL-Q5MC2-I...item1c41faa863 or
http://www.ebay.co.uk/itm/New-LJ12A3...item53ffd022e5
Normally closed:- http://www.ebay.co.uk/itm/DC-6-36V-N...item417755e4ae and
http://www.ebay.co.uk/itm/4mm-Tubula...item43bbcedff7 Also
this :- http://www.ebay.co.uk/itm/DC-10-30V-...item43bbcddc3b ..Clive[/QUOTE]Last edited by manofgresley; 15-07-2014 at 11:43 AM.
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15-07-2014 #15
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15-07-2014 #16
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16-07-2014 #17
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16-07-2014 #18
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16-07-2014 #19
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17-07-2014 #20
This is the drawing. You will have to make sure the 0v terminals of both power supplies are connected together otherwise it will not work. Where it shows a 24v dc PSU you could use a 12V dc PSU instead if desired.
Colours of the proximity switch wires are for the ones I used but I think they are pretty standard.
Because these are home switches I was not overly concerned about N/O, N/C, so for example mine are 'off' and 'open' until they are activated whereupon they are 'on' and 'closed'. If you get yours wired up and they operate the wrong way you thought they would you can just 'invert' their operation in the software.
Last edited by EddyCurrent; 17-07-2014 at 12:14 PM.
Spelling mistakes are not intentional, I only seem to see them some time after I've posted
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