techymechy
Aluminum
- Joined
- Oct 24, 2018
I'm a newby and am just starting a shop.
I bought an older Dumore 44 tool post grinder that hasn't been used for years. I turned the spindle and motor by hand and things seemed to turn fine. The motor has the #4 sheave on it and the spindle has the #3 sheave on it (supposed to be 15,000 rpm spindle speed). I bought some Velocite #6 oil and put 20 drops in the spindle and spun it by hand for a few minutes then places the belt on the motor and spindle and turned it for a couple of minutes. I then added 6 more drops of oil and ran it for maybe 10 minutes. Then I added 6 more drops and ran it for 10 minutes. then I added about 15 more drops and ran it for 10 minutes and measured the bearing temperatures. The instructions say not to add more than about 50 drops at one time.
My garage temperature is about 66F. The max bearing temperature on the belt side was about 112F (Trise ~46F). The max bearing temperature on the grinding wheel side was about 130F (Trise ~ 64F). I have zero experience with these grinders. Is my bearing temperature too high or what is too high of a temperature?
I look forward to your thoughts?
The spindle did turn easier after oiling and running.
Dave
I bought an older Dumore 44 tool post grinder that hasn't been used for years. I turned the spindle and motor by hand and things seemed to turn fine. The motor has the #4 sheave on it and the spindle has the #3 sheave on it (supposed to be 15,000 rpm spindle speed). I bought some Velocite #6 oil and put 20 drops in the spindle and spun it by hand for a few minutes then places the belt on the motor and spindle and turned it for a couple of minutes. I then added 6 more drops of oil and ran it for maybe 10 minutes. Then I added 6 more drops and ran it for 10 minutes. then I added about 15 more drops and ran it for 10 minutes and measured the bearing temperatures. The instructions say not to add more than about 50 drops at one time.
My garage temperature is about 66F. The max bearing temperature on the belt side was about 112F (Trise ~46F). The max bearing temperature on the grinding wheel side was about 130F (Trise ~ 64F). I have zero experience with these grinders. Is my bearing temperature too high or what is too high of a temperature?
I look forward to your thoughts?
The spindle did turn easier after oiling and running.
Dave