Thread: DIY sandblasting cabinet

Originally Posted by Turbine Builder

No will make up a cyclone dust collector system.

Hooked up to a shop vac?

Originally Posted by NedsHead

Hooked up to a shop vac?

No will be more heavy duty than a shop vac.

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Made up a couple of air baffles and bolted them into the cabinet, suction outlet pipe screw on and flitted most of the air line parts. Going to use a electric air valve and have a push switch to operate the air instead of a foot switch, the push switch is set just above my knee, do any you guys know were a good place to place the earth wire to for the air valve

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What voltage is the solenoid operating at? That determines what happens with the earth wire.
Where does the other end go? Im assuming to the box the switch is in and attached to the box itself?

Originally Posted by Turbine Builder

do any you guys know were a good place to place the earth wire to for the air valve
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Hi TB,

Since you have other electrical items in your cabinet, the whole cabinet should be earthed ! In which case a nut & bolt through the metalwork would earth the air valve. Even though a lot of stuff nowadays is supposed to be double insulated, it doesn't preclude having a good earth !

Originally Posted by racingtadpole

What voltage is the solenoid operating at? That determines what happens with the earth wire.
Where does the other end go? Im assuming to the box the switch is in and attached to the box itself?

240 volts and that wire is the earth from the power cord, only two wires from the solenoid valve.

Then you need to attach it to the frame and cabinet
Also expect that you may experience nuisance tripping of any RCD that is feeding that circuit if you get a static build up through the dust extraction or media suction pipes.

Originally Posted by BaronJ

Hi TB,

Since you have other electrical items in your cabinet, the whole cabinet should be earthed ! In which case a nut & bolt through the metalwork would earth the air valve. Even though a lot of stuff nowadays is supposed to be double insulated, it doesn't preclude having a good earth !

Hi BaronJ, yeah did use nut & bolt through the metalwork but when i push the switch it trips the circuit breaker. My thinking i may need to clean off a spot of paint to bare metal and bolt the earth wire directly into the metal.

Originally Posted by racingtadpole

Then you need to attach it to the frame and cabinet
Also expect that you may experience nuisance tripping of any RCD that is feeding that circuit if you get a static build up through the dust extraction or media suction pipes.

OK thanks mate

Originally Posted by Turbine Builder

Hi BaronJ, yeah did use nut & bolt through the metalwork but when i push the switch it trips the circuit breaker. My thinking i may need to clean off a spot of paint to bare metal and bolt the earth wire directly into the metal.

Hi TB,

Yes you do need a clean connection to the earthed frame ! But I'm a bit concerned by the circuit breaker tripping out when you apply power. You need to find out why its tripping out !

The whole idea of having an earthed frame/chassis is to protect you in case of an electrical fault that could make the equipment live. This means that the fuse/circuit breaker removes the supply voltage rather than the supply voltage going through you !!!

Originally Posted by BaronJ

Hi TB,

Yes you do need a clean connection to the earthed frame ! But I'm a bit concerned by the circuit breaker tripping out when you apply power. You need to find out why its tripping out !

The whole idea of having an earthed frame/chassis is to protect you in case of an electrical fault that could make the equipment live. This means that the fuse/circuit breaker removes the supply voltage rather than the supply voltage going through you !!!

Hi BaronJ,
The valve and push switch are new items,have no wiring diagrams on how to wire them up. Would it be that i have the cabinet on wheels which might be isolating the earth Anyway will try again and see what happens and if that fails will call in the expert.

Is the circuit breaker tripping for earth leakage or overload?

Originally Posted by Turbine Builder

Hi BaronJ,
The valve and push switch are new items,have no wiring diagrams on how to wire them up. Would it be that i have the cabinet on wheels which might be isolating the earth Anyway will try again and see what happens and if that fails will call in the expert.

Hi TB,

If the the earth wire from the mains lead is correctly wired in the mains plug then connecting it to the chassis/frame will provide the earth connection irrespective of the wheels.

I assume that the mains plug is not a moulded on one, in which case you need to check that it is wired correctly.
Here in the UK green&yellow is the earth wire, brown is live, on old wiring it used to be red, blue is neutral. Again on old wiring it used to be black.

Connection wise, the mains live wire should go to one side of the switch, one of the valve wires would go to the other side of the switch. The other valve wire should go to the mains neutral wire. That will allow the switch to turn the valve on and off.

Take care 240 volts is dangerous and can easily kill you so make sure that when you are playing about with the wiring it is not plugged in !

HTH.

Originally Posted by racingtadpole

Is the circuit breaker tripping for earth leakage or overload?

I don't really know, i am no expert on electrical stuff.

Originally Posted by BaronJ

Hi TB,

If the the earth wire from the mains lead is correctly wired in the mains plug then connecting it to the chassis/frame will provide the earth connection irrespective of the wheels.

I assume that the mains plug is not a moulded on one, in which case you need to check that it is wired correctly.
Here in the UK green&yellow is the earth wire, brown is live, on old wiring it used to be red, blue is neutral. Again on old wiring it used to be black.

Connection wise, the mains live wire should go to one side of the switch, one of the valve wires would go to the other side of the switch. The other valve wire should go to the mains neutral wire. That will allow the switch to turn the valve on and off.

Take care 240 volts is dangerous and can easily kill you so make sure that when you are playing about with the wiring it is not plugged in !

HTH.

OK thanks mate yes the plug is moulded and is mark with earth, live and neutral on the front end of the plug.