Cooling on mill

This topic has 10 replies, 9 voices, and was last updated 1 January 2017 at 22:36 by Enough!.

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22 December 2016 at 22:19 #273347
Men Ifr
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@menifr84251
What cooling do you use or none?

I bought a spray mister unit which keeps the tool wet but makes a lot of mess.

Im wondering if a graviy feed or car washer pump may be the trick?

Or mill dry but i see oil misting off so the cutter quickly gets upto 200deg plus which cant be good for it….
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22 December 2016 at 22:19 #18329
Men Ifr
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@menifr84251
What do you use?
22 December 2016 at 22:42 #273349
terry simpson 1
Participant
@terrysimpson1
Do not use this system, it is a health hazard, the air that you breath in whilst working is saturated with tiny globules of coolant. Not good for your lungs.

This system was primarily designed for totally enclosed CNC machines.
22 December 2016 at 22:44 #273350
Anonymous
All of my mills have built in coolant pumps. I use Castrol Hysol XF as a coolant and I keep the mix correct with a refractometer. How I use coolant depends on the mill.

CNC: I always use flood coolant (except for cast iron, brass and plastics) primarily to wash the swarf away rather than cooling the mainly carbide cutters.

Horizontal: As for CNC, except mostly for cooling as I only use carbon steel and HSS tooling.

Vertical: I almost never use coolant since there is no drip tray and the stuff gets flung everywhere. I wouldn't worry if a HSS cutter was running with the swarf coming off yellowish. For carbide tooling anything goes, the swarf is normally at least blue in colour and when running hard the cutter has a hint of red in subdued light.

A summary is that for carbide tooling I almost never use coolant (except for the CNC mill) and for HSS tooling I almost always use coolant (except where the material doesn't need it or on the vertical mill).

Complicated isn't it!

Andrew
22 December 2016 at 22:48 #273352
Enough!
Participant
@enough
When I don't cut dry, I use a coolant mist spray (like this) but without the coolant. Clears the chips so you aren't recutting them and helps cool the tool without getting messy.

You need an air source of course.
22 December 2016 at 23:15 #273355
John Reese
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@johnreese12848
I use a squirt bottle with water based coolant. My primary goal is to prevent aluminum welding to the tool.
23 December 2016 at 09:37 #273380
Brian Oldford
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@brianoldford70365
Posted by Bandersnatch on 22/12/2016 22:48:32:

When I don't cut dry, I use a coolant mist spray (like this) but without the coolant. Clears the chips so you aren't recutting them and helps cool the tool without getting messy.

You need an air source of course.

Air blast cooling! I haven't tried that yet. I'll need to rig up something to trap/collect the chips as they are thrown off.
23 December 2016 at 09:42 #273382
not done it yet
Participant
@notdoneityet
Do not use this system, it is a health hazard

Only if you breathe it in! Only if the mist is made with lubricant as well as water! If really fussy, one can wear a face mask, but adequate ventilation applied, to drag the mist away from the area of the operator is quite satisfactory, I would expect.

Using water as a coolant is better than just compressed air – a far higher specific heat capacity for water – but every little bit of cooling can help in some situations.
23 December 2016 at 09:49 #273386
Chris Evans 6
Participant
@chrisevans6
I am with John Reese on this, a squirt bottle for lathe or mill. Most times however I just use a small acid brush and undiluted soluble oil. For home machining we are never in that much hurry to move metal surely ? My garage is attached to the house and my wife always complains if to much smell pervades weather from cutting oils or paint.
23 December 2016 at 10:02 #273388
SillyOldDuffer
Moderator
@sillyoldduffer
Fitting flood cooling to my mill must be my least cost effective workshop purchase yet. It's hellish messy and not usually needed for light hobby work, for which I use a squirt bottle &/or brush, or cut dry.

I do switch it on for 'heavy duty' work, for example when a lot of steel has to be removed in one quick session with an HSS cutter.

As always with choosing tools and technique, much depends on what you are doing. I usually find out what's best for me the hard way!

Dave

Edited By SillyOldDuffer on 23/12/2016 10:03:24
1 January 2017 at 22:36 #274959
Enough!
Participant
@enough
Posted by Brian Oldford on 23/12/2016 09:37:33:

Air blast cooling! I haven't tried that yet. I'll need to rig up something to trap/collect the chips as they are thrown off.

Sorry Brian, only just saw this – Christmas and all that.

I didn't mean to imply that I use the air system at full pressure. I have a spur taken off the main supply via a regulator which I use for this (and a few other things such as running small steam engines). I usually have the pressure on this section regulated to around 10 psi or so and I further control the air-flow with the valve on the (dry) coolant spray device. So it certainly doesn't throw chips all over the place …. just gets them out from under the cutter.
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