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  1. Quote Originally Posted by Desertboy View Post
    But you cannot go wrong with Cherry or Happ microswitches, high repeat-ability and guaranteed for 10 million clicks which should be good for a few weeks lol. Should cost ~1 to 1.50 a switch which for cnc is refreshing lol.
    You should be aware that mechanical switches often have a minimum switching current needed for those kind of expected lifespans. If switch contacts don't switch enough current, they oxidise and fail to conduct, as they rely on a certain amount of arcing to keep the contacts conducting.

    The same also applies to relay contacts.
    Avoiding the rubbish customer service from AluminiumWarehouse since July '13.

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  3. #272
    Chaz's Avatar
    Lives in Ickenham, West London, United Kingdom. Last Activity: 5 Hours Ago Has been a member for 5-6 years. Has a total post count of 1,171. Received thanks 84 times, giving thanks to others 54 times.
    So many options.

    http://uk.rs-online.com/web/c/automa...sort-order=asc

    Id probably consider the ones like this (http://uk.rs-online.com/web/p/limit-switches/0199046/) or similar.

    Panasonic, so not cheap crap. NC, Easy to mount, should work for me but I dont really want to buy 6 if I can avoid it.

  4. #273
    Quote Originally Posted by Chaz View Post
    Getting them to work as single NC switches is fairly easy on the CS Labs / Mach 3 setup.

    Im trying to work out how to wire them in series and how to mix between limit / home options.

    Another way is to wire something via the E Stop circuit for limit switches and not actually use the 'limit switch' pins available to Mach 3.
    You should be fine to wire them in series no problems but only if you use them as Normally Closed, if you use them Normally open they won't trigger! Normally closed the circuits is flowing and your detecting a break it doesn't matter which one triggers. Normally open the circuit is closed and unless you trigger both microswitches at the same time (Which can never happen in real world use) the circuit can't complete.

    There's no real power going through them so wire from one to the other so should be no need for anything else.

    If I were you I would wire a 2nd set of limits to the Estop regardless as it seems more reliable than relying on the software and you really can't afford a crash.
    http://www.mycncuk.com/threads/10880...60cm-work-area My first CNC build WIP 120cm*80cm

    If you didn't buy it from China the company you bought it from did ;)

  5. #274
    Quote Originally Posted by Chaz View Post
    So many options.

    http://uk.rs-online.com/web/c/automa...sort-order=asc

    Id probably consider the ones like this (http://uk.rs-online.com/web/p/limit-switches/0199046/) or similar.

    Panasonic, so not cheap crap. NC, Easy to mount, should work for me but I dont really want to buy 6 if I can avoid it.
    You're paying for the IP rating mostly if you're not running liquid coolant I would be happy with Cherry or Happ microswitches simply because arcades have used them since the 80's pretty much unchanged design and they have proven themselves to be ultra reliable over a long time and arcade machines were abused! They are certainly not suitable if your cutting under running liquid but they are so cheap 6 would cost the same as 1 panasonic and although the panasonic might be better the happ's or cherry's have certainly had a lot lot more real world testing as almost every arcade machine, including gamblers in the 80's, 90's, 00's and even today had/have either happ or cherry switches
    Last edited by Desertboy; 08-06-2017 at 09:41 AM.
    http://www.mycncuk.com/threads/10880...60cm-work-area My first CNC build WIP 120cm*80cm

    If you didn't buy it from China the company you bought it from did ;)

  6. #275
    Chaz's Avatar
    Lives in Ickenham, West London, United Kingdom. Last Activity: 5 Hours Ago Has been a member for 5-6 years. Has a total post count of 1,171. Received thanks 84 times, giving thanks to others 54 times.
    Quote Originally Posted by Desertboy View Post
    You're paying for the IP rating mostly if you're not running liquid coolant I would be happy with Cherry or Happ microswitches simply because arcades have used them since the 80's pretty much unchanged design and they have proven themselves to be ultra reliable over a long time and arcade machines were abused! They are certainly not suitable if your cutting under running liquid.
    True. At the moment I'm not sure if Ill be using coolants. Ive been thinking to get some form of metal / material bellows system in place, id be more comfortable to have them IP Rated, just in case. Suppose in the overall costs of the machine, paying 50 for switches is not really an issue.

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  8. #276
    Chaz's Avatar
    Lives in Ickenham, West London, United Kingdom. Last Activity: 5 Hours Ago Has been a member for 5-6 years. Has a total post count of 1,171. Received thanks 84 times, giving thanks to others 54 times.
    Ok, fundamental question.

    Is it normal or acceptable to use the same switch (mechanical or proxy) for both home and limit? I dont understand how the machine would know if it was simply sent home or it actually needs to stop as its a limit. Is there logic that says 'ref all' and it goes home but if its hits the home limit during any other movement (manual or programmed) that the machine will then stop?

  9. #277
    Quote Originally Posted by m_c View Post
    You should be aware that mechanical switches often have a minimum switching current needed for those kind of expected lifespans. If switch contacts don't switch enough current, they oxidise and fail to conduct, as they rely on a certain amount of arcing to keep the contacts conducting.

    The same also applies to relay contacts.
    That I didn't know I built an arcade cabinet to Jamma specifications including the correct jamma wiring loom, sanwa joysticks & cherry microswitchs and a pirate 200 in 1 cart but I cannot remember how I wired it up now lol it was over 10 years ago, the cabinet still works fine after a hell of a lot of abuse, sits on a campsite my mate owns in Luxembourg on free play.

    Arcades could take a hell of a lot of abuse but there was 1 type of game that killed the microswitchs in an insanely short time, Daley Thompson's Decathalon type games lol.

    I would think that if you got even 1% of the performance out the microswitches (100,000 presses) unpowered it would last any cnc machine well over 10 years as you don't really trigger the limits much a day even if you're using the machine 24/7.
    http://www.mycncuk.com/threads/10880...60cm-work-area My first CNC build WIP 120cm*80cm

    If you didn't buy it from China the company you bought it from did ;)

  10. #278
    Quote Originally Posted by Chaz View Post
    Ok, fundamental question.

    Is it normal or acceptable to use the same switch (mechanical or proxy) for both home and limit? I dont understand how the machine would know if it was simply sent home or it actually needs to stop as its a limit. Is there logic that says 'ref all' and it goes home but if its hits the home limit during any other movement (manual or programmed) that the machine will then stop?
    I know how it works on grbl (Arduino cnc solution) when it's doing a home it ignores the limit so doesn't go into shutdown mode. If it's not homing then it treats it as a limit switch and shuts everything down until reset G code is sent.

    I'm sure Mach 3 treats it the same way (I think LinuxCNC does)

    If I were you though I would fit another set of limit switch further back that trigger an E stop as well as extra protection! I can maybe help you source high quality IP64 rated microswitches I have a friend who services and repairs 4 poster lifting ramps for steam cleaning bays I'll give him a bell see how much he would charge for new ones if they're cheap enough I'll use them lol.
    Last edited by Desertboy; 08-06-2017 at 10:12 AM.
    http://www.mycncuk.com/threads/10880...60cm-work-area My first CNC build WIP 120cm*80cm

    If you didn't buy it from China the company you bought it from did ;)

  11. #279
    Quote Originally Posted by Chaz View Post
    This is the limitation (for limit switches).
    Attachment 21860

    'Only 5 of these inputs blah blah' ....

    Ive actually crashed Mach 3 before by trying to use other inputs than those (for limit switches, I must stress). No problem using them for ATC switches etc.
    Chas I have not used the IP/A but doesn't the controller use its own plugin with Mach and it states on the website 24 inputs at 24V I don't think it uses the Mach screen to set them up. I could be wrong.
    ..Clive
    The more you know, The better you know, How little you know

  12. #280
    Chaz's Avatar
    Lives in Ickenham, West London, United Kingdom. Last Activity: 5 Hours Ago Has been a member for 5-6 years. Has a total post count of 1,171. Received thanks 84 times, giving thanks to others 54 times.
    Quote Originally Posted by Clive S View Post
    Chas I have not used the IP/A but doesn't the controller use its own plugin with Mach and it states on the website 24 inputs at 24V I don't think it uses the Mach screen to set them up. I could be wrong.
    Clive, yes, I need to check. All I recall is 'killing' Mach 3 when I inadvertently used the inputs outside of Mach 3's range. Maybe coincident but its all I could relate to making Mach 3 crash.

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