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Thread: Mist Coolant systems
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13th Aug 2019, 11:55 PM #31Member
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Hey BobL,
how is the misting going? Are you happy with the cheap Ebay unit? Did you come up with any other potential misting fluids?
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14th Aug 2019, 09:20 AM #32Member: Blue and white apron brigade
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14th Aug 2019, 10:05 AM #33Senior Member
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Skin problems
I haven't ever had skin problems,
Then you have been lucky.
A toolmaker who used to work for me often had BandAids on his fingers: the commercial coolant was forever cracking his skin. That's why I use olive oil: biocompatible for sure!
It is worth reading up on 'MQL' or 'Minimum Quantity Lubrication' to see what is possible. It is now being widely used by aerospace companies. Forget the whole 'coolant' concept: it is a dinosaur. You just need to keep the cutter lubricated to avoid any build-up at the edge (BUE). Air blast removes the chips so you don't get 'second cuts' which damage the surface of the job.
Cheers
Roger
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14th Aug 2019, 11:07 AM #34Member: Blue and white apron brigade
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Not always so - there are a few folks that are allergic to OO. Very few are allergic to internal consumption of OO but more are allergic to extended skin contact which is why OO is now no longer recommended for use by masseurs.
All bio oils exposed to air also eventually become rancid and produce toxins fortunately OO is one of the slowest to oxidise and produces amongst the lowest amounts of toxins. The other thing that can happen with bio oils when the oxidise is they polymerise (ie form long chains of organics which can bind into a sticky layer that is hard to remove). I used to use canola in the auxiliary oiler of my chainsaw mill but over 2-3 years it formed a tacky layer all over everything that was really hard to remove and there was not much that would dissolve it. That's the main reason why I steered clear of using any bio oils on my machinery.
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14th Aug 2019, 08:27 PM #35Member
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Thanks for your reply. I'm going to try a misting set up on a vertical bandsaw that I just bought. There's no facility for flood coolant recycling so it's the only option other than manually squirting. It comes with a compressor for a chip blower so should be an instant modification. I read that a mister was an original option on the bandsaw anyway.
I was thinking that an ethanol based fluid would be a good idea.... it evaporates easily, has a high specific heat of vapourisation as mentioned earlier, and is non toxic. I'm going to try not methylated spirits because of the smell but 90% medical handwash which I can get as a business cost. I just need to dissolve a bit of lubricant in it (yet to work out what). Will probably try a cheap Ebay system as I can't see much advantage with the expensive misting systems. I'll let you know how it goes.
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14th Aug 2019, 09:05 PM #36Member: Blue and white apron brigade
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Ethanol is toxic if exposed to high enough quantities and because its quite volatile it can be very dangerous as you can fill your shed up with it pretty quickly without you even knowing it so I wouldn't use it unless you have really good ducted ventilation. As well as being highly flammable is has a low flash point so can ignite very easily from a small spark. Vapours are usually heavier than air so it will pool around your feet and before you know it BOOM. Ethanol does have a lot higher long term allowable level in the workplace than say kero/ATF mix BUT well before that level it will also make you drunk which is not a good way to be in the shed. I've experienced a similar effect when I mill or turn Al and use Meths as a lube and forget to turn my exhaust system on. The first sign is a slight lightheadedness and euphoria then you get clumsy and over confident and then you start stumbling and falling over.
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14th Aug 2019, 09:13 PM #37Member
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Yes but going by the volumes of mist coolant that you were getting through I don't think I'll run into trouble, it's a big shed too. In hospitals 90% ethanol is used as a hand disinfectant and on high turn over operating lists the workers are evaporating 5ml or so off their hands every 15min. I'm thinking of ethanol plus a bit of glycerine, they are misceable.
PS don't do an internet search for "glycerine as a lubricant"
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14th Aug 2019, 10:20 PM #38Member: Blue and white apron brigade
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Sure BUT Hospitals are also very large volume spaces with constant ventilation. All I can say is in my smallish (45 m^2) shed, if I use meths when working with Al and don't run my ventilators I start to feel mildly intoxicated after about 30 minutes.
PS don't do an internet search for "glycerine as a lubricant"
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