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Re: Replacement blade guide bearings


 


Hi Terry
I presume from the header you need new guide bearings.
All Taiwanese and Chinese manufactured saws have metric bearing sizes even if they have UNC threads on their (metric headed) bolts. Some early American made saws had special bearings with a flange on the outer race instead of a rear guide-roller and some had cam-follower bearings, these may have been inch sizes.

The following metric size deep groove ball bearings have been used:

Inside Diameter

(mm)

Outside

Diameter

(mm)

Width

(mm)

?±õ²Ô³Ù¡¯±ô.[1]

Bearing code

Preferred

Radial Internal Clearance grade

Comment

5

16

5

625

MC3

as rear guide-roller

8

22

7

608

MC3

as rear guide-roller

9

26

8

629

MC3

as rear & side guide-rollers

10

26

8

6000

CM or Normal

as side guides on later saws

10

30

9

6200

CM or Normal

most popular, esp up to y2000 from Taiwan

12

32

10

6201

CM or Normal

only some older saws

?These bearings are used at v.low speed and low load, so the ABEC rating[2] is not applicable, however the Radial Internal Clearance[3] grading should be considered.
Just measure the bearings ID, OD and Width and pick out the ones you need - jv

[1] Not all mnfr¡¯s follow the international codes for similar size bearings e.g. SKF, who work off IDxODxW.

[2] ABEC scale is a bearing industry standard for manufacturing tolerances on every measurable dimension except internal clearance. Higher ABEC ratings allow those bearings higher operational speeds, in excess of 30,000rpm, but no more load and even less shock resistance. ABEC 1 are cheap and wear out quickly, these are what you will get if you do not ask for better. ABEC 3 or 5 are usually better manufactured and still reasonably inexpensive.? You¡¯ll pay 5-10x as much for ABEC 7 or 9 for absolutely no measurable difference in performance over ABEC 3 in a 4x6. You can even buy an ABEC 9 bearing with C5 radial internal clearance (for high speed roller skates) that is worse for side guide rollers than a much cheaper ABEC 3 with even C3 radial internal clearance.

[3] Radial internal clearance is essentially the amount of up&down movement the bearing will allow.? Less is better for 4x6? guide rollers.

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