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QT15N slide way oil

tsabo

Plastic
Joined
Feb 14, 2021
Hello,

I'm curious as to what slide oil I should use in my 1994 Mazak QT15N. The info plate is scratched up and looks to say MOBIL DTE24 for both the hydraulic and slide oil so I got that.

The DTE 24 doesn't have the consistency or smell as of what's in the machine. The oil in the reservoir seems even tackier than vactra no 2 that I use on my mills.

Any thoughts? I'm thinking just clean out the reservoir and using vactra no 2 like my mills use. Would doing so cause any issues?

-Tyler
 
I use iso 68 slideway oil, brand doesn't matter.


Wysłane z mojego D5803 przy użyciu Tapatalka
 
This topic is of interest to me. I have the issue that I am surrounded by farmers and virtually all industrial supplies have to be special ordered including all machine oils. I did some research recently on the subject of what attributes these different oils should possess. My conclusion is that trying to compare attributes and specs is a minefield of incomparable specs from manufacturer to manufacturer. You see, not only do you need to know the stated viscosity of the oil which can be stated in an ISO number. Saybolt number or several other viscosity systems, which cannot be directly compared to each other because the viscosity tests are not uniform nor are they done at the same temperatures. Making this even worse is that the industry uses a viscosity index number to identify the viscosity change relating to temperature change, but by itself making this determination is not possible with just a number, you need the curve because the viscosity change is not linear and these curves are never stated. Even worse, the viscosity, when stated, is at 40 degrees C and 100 C degrees. In our application these oils operate at room temperature. Making this even worse is that performance attributes are rarely stated in meaningful terms either, like a slide way oil should have extreme pressure lube properties and yet be impervious to dilution from coolant. I could also go into stated specs for gear oils, but the story is the same.

I ended up with a Shell product SHELL TONNA S3 M68, not because it is good or bad, but it is all I could find and I had to buy a 20 liter pail. Does anybody else use this oil?
 
One more point is that it appears to me that most of us have no idea what viscosity is. So for those that fall into that category, viscosity is the thickness of the oil and is measured by the time it takes to flow through a hole. Now that sounds simple, but it is not the full story. Effectively viscosity relates to the molecular length of the hydrocarbon chain, but because the test is so simple, it does not differentiate between blended multi length chains and oils having chains all the same length, as both the blended and unblended chains both pass the same viscosity test. That is very important to know because blended (Multi-grade) oils have very poor sheer strength in comparison to straight grade oils. The advantage of blended oils is the viscosity index number which reflects the amount of viscosity change over temperature change. In our case where our machines operate at room temperature, a low index number is an advantage. In other words, we should never use blended multi-grade oils. We need to have maximum sheer strength. Simply because we don't need multi-temperature ability.

Of course viscosity is still not the whole story either. I will briefly talk about performance and the real difference between the different types of oil. Oil companies add a chemical package to the base oils to enhance the oils performance in their intended application role. These packages are secret and are rarely ever stated, but they enhance or attenuate certain attributes, like extreme pressure lubricity (adding metallic powders), chemicals that enhance particulate suspension or coagulation where contaminating particulate coagulates and settles out of the oil and settling to the bottom of the sump. This is why we should never use SAE automotive oils in our machines, we do not want to keep foreign particulate in suspension because we don't have oil filters that are designed to filter the contaminates.

I am not an oil specialist by any means, just a curious consumer that has found this information almost non-existent and very difficult to find. I have tried to put this info in layman terms. Please don't shoot me if I am incorrect. This is simply how I understand the subject.
 
Thanks for the info, Steve.

I ended up using the mobil vactra no 2. ISO 68.
 
That is a linear guide machine. Use a 68 weight oil and you will regret it. That is why it requires a lighter weight oil.
 
That is a linear guide machine. Use a 68 weight oil and you will regret it. That is why it requires a lighter weight oil.

I don't understand your comment. Mobil vactra no.2 is a ISO 68 slide way oil, which is exactly what a linear guide machine requires. Now, slide way oils do come in lighter viscosities, like ISO 32, but not so common.
 
I don't understand your comment. Mobil vactra no.2 is a ISO 68 slide way oil, which is exactly what a linear guide machine requires. Now, slide way oils do come in lighter viscosities, like ISO 32, but not so common.

All the older Mazaks require the lighter way oil. A Mazak tech told me that the metering valves in the oil system were designed for the lighter oil. With a heavier oil you will not get the proper amount of lube to the balls in the guide trucks.
 
All the older Mazaks require the lighter way oil. A Mazak tech told me that the metering valves in the oil system were designed for the lighter oil. With a heavier oil you will not get the proper amount of lube to the balls in the guide trucks.

Good to know, thanks.
 
All the older Mazaks require the lighter way oil. A Mazak tech told me that the metering valves in the oil system were designed for the lighter oil. With a heavier oil you will not get the proper amount of lube to the balls in the guide trucks.

Let me clarify-unless they have box ways.
 








 
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