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  1. #151
    Quote Originally Posted by templecorran View Post
    If you think about it ... the mains plug only switches the live, the neutral is unswitched....Solid State relays are prone to not switching off though
    Thanks for clarifying that. I got a SSR as I thought solid state generally means more reliable. It's not a huge issue if the spindle doesn't turn off I don't think since I'll have a normal switch nearby on the mains in addition to the relay. It's a 25 amp relay.

  2. #152
    Are switching live and neutral, or just live?
    interesting

    im using a cheap 16A switch to switch both live and neutral... are you saying i should be useing a relay and only switching the live ? ill comence experimentations when its not so dark

    iv bought a plug in rcd adapter so hopefully it will win the race against the main one and save my house mates missing flash gordon on the telly :)

  3. #153
    ok i removed the surge protector, ran the neutral passed the power switch and bought a rcd adapter
    no joy :(
    tripped the building out a couple more times (house mates cursing and growling)
    stripped the whole thing down looking for a short
    i managed to norrow the problem down to some kind of interaction betwean my 24v supply and the driver board
    took them over to my girlfreinds house, tripped her power out a dosen times before i twigged than one of the brass risers i was using to mount my driver board to the power supply was reaching through the supply case and touching the top of one of the large caps in there
    FFF***nvpkdjsdkcning Hell!!!!!!

    thats what i get for being lazy and not making sure they were clear... three days with my thumb up my arse!

    ill have to keep my fingers crossed that i havnt damaged the board

  4. #154
    glad you found the prob mark on wards and up :)

  5. #155
    its a bit scruffy at the mo but it is working well :)

    Click image for larger version. 

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    iv been looking at ways of clamping work to the bed without drilling and taping hundreds of blind holes that will inevatably clog with shit
    im thinking i will drill and tap some choice holes as and when things develop

    i may have a job with a hundred or so small control panles to engrave so iv been looking at ways to clamp easily and with repeatability

    Click image for larger version. 

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    20mm o/d o-ring with 0.34mm protruding above face
    Click image for larger version. 

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    one way valve
    Click image for larger version. 

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    one way valve holding the vacuum,, at 20mm O/D it only just holds onto this alli plate

    Click image for larger version. 

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    35mm o/d o-ring 0.3mm protruding above the face
    Click image for larger version. 

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    valve holding the vacuum
    Click image for larger version. 

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    takes quite a bit of effort to get this one to pull off
    i left it stuck there like that for an hour and i had to give it a good pull to get it off, i wouldnt trust it to hold while on the cnc but it gives a good indication of how well the valve holds the vacuum

    very simple and cheap to make in any size , im looking at machining both sides and just placing them between my bed and work peice out of the way of the cut

    once iv proven the cocept i may use a peristatic pump (nice and quiet) to pull the vacuum
    iv also orderd some transparent valves so i can see which modules are failing to seal

    cant see it not working at least for engraving :)
    Last edited by blackburn mark; 09-01-2011 at 12:45 PM.

  6. #156
    Mark

    Another tip is double sided tape for your application.

    Phil

    Sent from my HTC Desire using Tapatalk

  7. #157
    Quote Originally Posted by M250cnc View Post
    Mark

    Another tip is double sided tape for your application.
    hi phil
    sounds messy and not quite as elegent for 100+ pices ... iv used bu-tac before now for engraving :) worked ok

  8. #158
    Quote Originally Posted by blackburn mark View Post
    hi phil
    sounds messy and not quite as elegent for 100+ pices ... iv used bu-tac before now for engraving :) worked ok
    It's only messy if you machine through the tape.

    It is the number one method used for holding down small flat thin components.

    Carpet tape is the best type.

    Phil


    Sent from my HTC Desire using Tapatalk

  9. #159
    It is the number one method

    well maybe i can change all that nonsense lol

  10. #160
    Quote Originally Posted by blackburn mark View Post
    iv used bu-tac before now for engraving :) worked ok
    Well I've never heard of that method. You must like doing things the hard way lol

    Phil

    Sent from my HTC Desire using Tapatalk

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