Fingers crossed it'll cut ally

[Jonathan]

Are switching live and neutral, or just live?

I know that VFD's are prone to tripping RCDs if you switch both on at the same time, and given that VFDs are basically a very fancy switch mode power supply...

Slightly off topic but that reminds me...my router had a switch in it which switched both live and neutral. Is it safe to connect the neutral permanently and have the live on a relay (solid state)?

[templecorran]

If you think about it ... the mains plug only switches the live, the neutral is unswitched. you can happily feed through the relay. Solid State relays are prone to not switching off though. I use a 4PDT relay with all 4 poles switching the current. I was concerned with the inductive load of the router causing contact burn with just one pole. my 1020W motor is capable of drawing over 4 amps on load, I lacked confidence that my relay contacts were up to that :-)

[Jonathan]

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.

[blackburn mark]

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 :)

[blackburn mark]

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

[h4ppy-chris]

glad you found the prob mark on wards and up :)

[blackburn mark]

its a bit scruffy at the mo but it is working well :)



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


20mm o/d o-ring with 0.34mm protruding above face

one way valve

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


35mm o/d o-ring 0.3mm protruding above the face

valve holding the vacuum

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 :)

[M250cnc]

Mark

Another tip is double sided tape for your application.

Phil

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[blackburn mark]

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

[M250cnc]

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


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