How to know the correct size for bearings

#1: Post by **peacecup** » April 29th, 2017, 1:50 pm

The lower bearing on my knock housegrind died this morning.

How does one know the correct bearing size? Inside and outside diameter plus thickness? Anything else?

PC

#2: Post by **ira** » April 29th, 2017, 2:13 pm

Inside, outside and thickness define what will fit. Then there is unsealed, shielded and sealed one side or both, type of lubricant, ball load and type of ball cage if any. Lastly quality, though I doubt quality matters much in a Hausgrind as it tends to relate to accuracy and stability and noise level. Noise as in how perfect are the balls and races, how perfectly do they fit together, how well do the 2 halves of the bearing stay in alignment when rotated and how even is the torque required to rotate the bearing. Some of that is measured in millionths of an inch or maybe even less.

In your case, if you can find any correctly sized double sealed food safe lubricated bearing, you'll be fine. Finding everything but the food safe lubricant is trivial, never tried for food safe lubricant so no clue if it's hard or easy.

Ira

#3: Post by **Prairiedawg** » April 30th, 2017, 9:50 pm

Typically there is a number on the side of the bearing. There is a number of online vendors that should be able to match one up for you.