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fire hazard/sparks on trim saw

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Author Topic: fire hazard/sparks on trim saw  (Read 987 times)
Neural
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« on: April 28, 2009, 03:43:29 pm »

This is a biggie for me here, as I use Mineral Oil to cut my rocks. 
No matter how slow I seem to go, once in a while I see a spark or two come off a rock I'm working on.  This seems to happen especially with Aventurine.  Never had this issue with black jade, which I know is a lot harder.

Any clues on what is happening, and just how much of a spark it takes to get mineral oil to ignite?  I'd like to have the use of my hands for some time to come in my life.

thanks
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catmandewe
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« Reply #1 on: April 28, 2009, 04:25:43 pm »

The National Fire Protection Association has assigned a flammability rating of 1 (slight fire hazard) to mineral oil. The flash point should be somewhere around 380 degrees Fahrenheit, so you really have to get it hot before it will ignite. If you watch your saw blade at night, you will see that most times it has a constant glow to it, it is just not very noticeable during the day.
The oil mist is slightly more flammable than the oil itself, but it is still only a flammability rating of 1.

You really shouldn't have anything to worry about unless the oil gets uncomfortably hot, if it is too hot for you to touch, then you can start worrying.

Tony
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Bluesssman
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« Reply #2 on: April 28, 2009, 06:03:13 pm »

One thing also to remember, a liquid does not ignite. It is the vapors that can ignite. Your mineral oil would have to be so hot that you could not touch the saw table with your hands.
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about2
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« Reply #3 on: April 29, 2009, 07:15:08 pm »

Terrific advice and opinions all around.  I'm glad to know this as I am about ready to work on the 18" slab saw I bought and want to put into service.  I was worried about this very issue.  Thanks.
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Neural
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« Reply #4 on: May 02, 2009, 02:37:22 pm »

Now that I have the fire issue resolved, another issue comes to mind.  Working on weekends.   Normally my wife is not around when I use the trim saw, but I am concerned about the fine mist from the saw blade (the reason I wear a mask).
How far away do you need to be from the saw in order to be safe enough to not wear a mask?  Does the mist dissipate in a few minutes?
This is a big safety issue for me, as I'm not interested in having my wife get lung issues from inhaling mineral oil mist.

Your help is much appreciated.

-Jon
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travelerga
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« Reply #5 on: May 02, 2009, 03:09:44 pm »

If the mist is excessive wear a mask. Oil that coats your lungs can cause pneumonia. Minrial oil is a laxative but absorber through the skin or lungs.
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Neural
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« Reply #6 on: May 02, 2009, 03:33:03 pm »

Yes.  this is why I wear a mask all the time.  What I'm wondering about is whether or not my wife should be wearing one when she's across the room. :)  I don't normally cut when she's home.
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akansan
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« Reply #7 on: May 02, 2009, 03:49:30 pm »

I was told once about a product that keeps the mist down.  I can't for the life of me remember what it was right now, though!
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catmandewe
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« Reply #8 on: May 02, 2009, 09:12:42 pm »

The additive you can use is Bardahl "No Smoke" and it does keep the mist down.
There is also another generic brand that is the same stuff, but I don't remember what it is called.
The No Smoke is about 5 or 6 bucks and the generic one is a couple of bucks, they both have the same ingredients. I found the generic stuff in a truck stop, might look there or your local parts store.

Tony
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Taogem
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« Reply #9 on: May 03, 2009, 12:39:07 am »

After Rhonda mentioning a likely product, I was hoping someone would know and post it..

Thanks Tony!  :)
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woodyrock
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« Reply #10 on: January 11, 2010, 01:23:57 am »

For many years most lapidaries used kerosene with a wee bit of motor oil thrown in for slab saw oil. I did a bit of research into this in regard to fires, and could not find any documented instance of a slabsaw fire using kerosene. Now, personally, I would not use kerosene due to the low flashpoint. I would not wish to be the first person to have a slab saw light off.
Woody
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« Reply #11 on: January 11, 2010, 06:34:51 am »

Jon, I have been using an ISO 32 hydraulic oil from MFA farm stores. It has no smell or mist, and am approaching 4 years with it on my slab saw, and the blade is near new acting. Believe me I have abused that blade, too.
Dean (slabber) carries this in his shop for us cutters.
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« Reply #12 on: January 11, 2010, 08:44:45 am »

If your saw is generating a lot of mist, you might be running it too fast. I have a Lortone 8" trim saw and I get virtually no mist (splash at the point of contact with the blade, though). I'm using refrigeration equipment oil. Probably in the ISO 35 range.
Bob
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