Originally Posted By: miro
1. Base oil viscosity
As alredy mentioned ISO VG 220 is way to heavy even if the operationg temerature is 100C
Remember the grease is 90% oil. If the bearing was oil libricated do you gonna use the heavy ISO VG 220 Gear low speed oil?
T=40C you need ISO 22
T=65..80C you need something around ISO 100 grease
http://www.machinerylubrication.com/Read/798/grease-selection
2. Consistency NLGI 2 grease is ok unless you have special temerature requirements.
3. Type of thinkener you can define on you environmental requirements. e.g. water resistance dust sealing etc...
Than you can buy any grease that meet the calculated values.
Oh I forget something. My advice is not to use moly grease for this application. Experts say that ,moly is to slippery. At high speed rolling aplications rollers may not roll anymore.
Thanks Miro for your much helpful detail suggestions...
There is NO water contamination issue, just some flying dust & fluff, otherwise a clean ambient environment.
Can you also suggest a method to calculate the AMOUNT of GREASE to use during greasing/regreasing and if NLGI 2 is absolute necessary or will a NLGI 0/1/other consistency also work out well ?
And do you feel i should use a tacky / adesive type of grease, or will it be hurting the overall results ?
Note that these FAST 12,500 rpm needle roller bearings have an outer diameter of 16.5 mm and inside diameter of 16.0 mm. The Shaft diameter is very near to 16.0 mm too...
I want to extend the regreasing intervals to 7-10 days at the least.
One last thing... is the viscosity of grease T=40C of 22 cSt the maximum allowed ?
Definitely let me know if this 22 cSt is a must requirement OR can it be like ~68 cSt or slightly higher ?