MetalworkingFun Forum

Can velocite 6 be used in place of velocite 10 for a mill spindle? We have some 6 but our fiscal year is up and can't order any 10 ? Its a south bend vertical mill

The excerpt below is from Mobil's site.

Oh.....and "Yes"!

Best Regards,
Russ

The Mobil Velocite Oils are recommended for lubricating high speed machine tool spindles.
Mobil Velocite Oil No. 3 is recommended for the ‘zero clearance’ type of spindle bearing which operates with
extremely close clearances - which may be no more that 0.0001" per inch of arbor diameter.
The majority of sleeve type spindle bearings have greater clearances and for these Mobil Velocite Oil No. 4,
No. 6 and No. 10 are recommended. Choice of viscosity depends upon relationship between clearance and
spindle speed. High speed and close clearance require Mobil Velocite Oil No. 4 - slower speed and wider
clearance require Mobil Velocite Oil No. 10
Mobil Velocite Oil No. 3 is also recommended for use in EDM applications where its low viscosity and electrical
characteristics, together with resistance to degradation, make it an ideal cooling and flushing medium.
Mobil Velocite Oil No. 6 and No. 10 are also suitable for use in hydraulic systems that do not require ‘anti-wear’
oils.

Great, thank you!!