Fire in the hole

**BobL** · 6th August 2017, 03:55 PM

I decided to follow up on M&Js pressure sensor idea.

4 of my WW machines (DP, BeltS, Lathe and BandS) are on VFDs so wiring a pressure sensor in line with the the remote switches (which are only 10V) is going to be a doddle.

I already have one of these low pressure sensors on my forge and I just checked I paid US$14 for it in 2013.
Just checked eBay/Banggood/Aliexpress, and see that a budget versions that would be suitable are available for ~$4

The blurb says the switch is only rated for 125V - i.e. appealing to north american market.
BUT
Magnifying the microswitch up from one of the supplied photos says the microswitch is rated to 2.5A @ 250V
Microswitch.jpg

I have ordered one and will test it out.

It could be used direct for machines up to ~3/4HP.
Above that you'd still need to use a relay, but relays are not expensive so even in a rated enclosure the whole switch should only cost about $25.

**richmond68** · 7th August 2017, 11:07 PM

Originally Posted by BobL

Extracted from the WA Design Tech E-journal (July 2017)
Sorry its not too clear - its the best I could do.
I suspect the the risk could have been reduced by using 6" ducting right up to the machine.

To the best of my knowledge the casadei c30 and c41 are rebadged minimax, from what I've seen online they appear identical. I've outlined the problems that exist with my C300 before - Minimax token dust collection, how to fix? - I suspect that the Casadei of similar age may suffer the same flaws. That a fire could occur in the blade shroud and flexible duct below the table comes as no surprise to me.

Addressing those fundamental design flaws is needed, 6 inch ducting to the machine won't fix a blade shroud lucky to flow 80cfm. That burnt piece of duct is from inside the machine, it is 120mm and runs from the shroud to the port on the rear of the machine. It's garbage, probably costs a quarter of the flow itself.

**safari** · 8th August 2017, 10:07 PM

Ensure fire extinguishers of the correct type

Could someone please advise what the correct size and type of extinguishers should be in a wood shop/

Thanks

**BobL** · 8th August 2017, 11:38 PM

Originally Posted by safari

Ensure fire extinguishers of the correct type

Could someone please advise what the correct size and type of extinguishers should be in a wood shop/

Thanks

workplace or DIY?
For a Workplace you should get a professional assessment done.
For DIY wood work shops an ABE type is usually sufficient.
Size wise you should be looking at around a 1kg for a single car garage and increase the size accordingly.
I have a 1kg ABE next to the back door and a 2kg and a fire blanket next to the front door

I also have a CO2 specifically for electrical fires. Letting off an ABE will fill your shed with powder and may damage electrical devices like VFDs on machines that are not on fire.

**safari** · 9th August 2017, 02:33 PM

Thanks for your reply BobL

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