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Does your coolant advertise it contains rust-inhibitors? Mixing coolant at 5% does not mean it stays stable at 5%. Use a refractometer to actually test your coolant that is in use.
Hi,
I have just come back to work after a few days off and found rust on the table of my mill where the coolant has dropped onto it. This obviously means that the concentration is too weak. I always mix the coolant to 5% and it doesnt take long before the coolant is like water and causes rust on the machine. How is the concentration getting weaker? i would have thought that the water would evaporate causing the concentration to increase. Does anyone have any advice? It doesnt seem right that i have to keep adding neat coolant oil to increase the concentration all the time
Does your coolant advertise it contains rust-inhibitors? Mixing coolant at 5% does not mean it stays stable at 5%. Use a refractometer to actually test your coolant that is in use.
http://www.kirkcon.com/
it states that it has good anti-corrosion properties and should be a concentration of 5%. I do use a refractometer and when i do a coolant change i wash the sump before adding the coolant but within maybe a couple of months the coolant seems to have diluted
I do not know your shop operation. Shops I work in have multiple operators/machinists. Anyone can go top off a coolant tank with straight water because they are too lazy to mix coolant.
http://www.kirkcon.com/
What concentration it is measuring now is what is important. Not at what concentration you mixed previously.
http://www.kirkcon.com/
i am the only machinist so i know that the machines arent getting topped up with water. I wonder whether its due to the machines not being used everyday and this is causing the problem somehow?
I have seen some coolants "separate out" after sitting unused for a period of time.
http://www.kirkcon.com/
on my lathe it was 2% and i only replaced the coolant about 6 months ago id say. As for the lathe it doesnt even read as it is bascially dirty water
this is what i was thinking. Does this mean i should just add neat oil or will this cause even more problems with the coolant? will it make it unstable?Originally Posted by txcncman
As good maintenance habits, machines should be cycled frequently, even if not being currently used, to keep parts lubricated and coolant circulated.
http://www.kirkcon.com/
I would not purposely add oil to coolant. It is certainly acceptable to wipe exposed steel with oil.
http://www.kirkcon.com/
but if i dont add neat coolant oil to get the concentration back up to 5% i will have to change the coolant every 2 months which isnt very cost effective. I think the answer is to run the coolant pump everyday to keep it moving. The top of the coolant in the sump is covered in a brown skim so im sure this is the cause
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