Another "i cant find this simple bearing" one

[julianf]

Ive got a few bearings, all of which should have the same ID, but they have different ODs (to control offset on a cutter)
-

Specifically, the one i want to replace is this one -

The measured ID of that one is 6.44mm (heavily used, and failed)

The measured ID of the others are 6.46 and 6.26


The measured OD of what they fit onto is 6.27



So, do i "assume" thats quarter inch, and ive got some measuring in accuracy.

The average of 6.44 and 6.27 is 6.355, which is, basically, spot on, if the wear has been equal on the OD of the fitting and the ID of the bearing.



So, 1/4"


The OD of the bearing seems to be spot on 22mm.


The height of the unit is 6mm, but im not fussed if thats greater.




There are loads of 1/4 x 3/4 inch bearings about - thats not a problem.
There are loads of 6mm x 22mm about.

But this mix and match of imperial and metric doesnt seem to make sense?


I always have issues with this, so is it actually common and i just need to go to [somwhere] and theyre all over the shelves, or is this an oddity?


Thankyou.

 

[RWD3M]

Hi Julian,

Just search the part number on the side of the bearing. Somebody like Bearingboys or bearingsrus should have them. I can't rad the number from the picture, is it 69002?

https://simplybearings.co.uk/shop/advanced_search_result.php?search_in_description=1&keywords=69002&

Or simplybearings

 

[OJCar]

https://bearing-king.co.uk/products...bearing-10mm-inside-x-22mm-outside-x-6mm-wide

 

[Pete.]

Press the bush out of the ID and you'll have a stock item you can buy.

 

[julianf]

https://bearing-king.co.uk/products...bearing-10mm-inside-x-22mm-outside-x-6mm-wide

View attachment 505924

That says its 10mm ID

 

[julianf]

Press the bush out of the ID and you'll have a stock item you can buy.

Ahh, right, so this is just an off the shelf one, with a bush pressed into it - that makes sense.

 

[carbon]

I’m only looking at this on my phone. But the bearing in the last picture looks to be a 69002. I’d 10mm od 22mm and width 6mm.from the picture it also looks like it has a bush in the middle to reduce the bore

 

[julianf]

In my haste, i mis-aligned my drift slightly, but im hoping it wont all shatter at speed -

 

[julianf]

damage on rhs showing as slight discoloration -

 

[Keithmac]

A bit ironic but I have used these in the past and they are very helpful.

Simply Bearings Ltd - Ball Bearings, Oil Seals, O-rings, V-Belts, SKF

simplybearings.co.uk

 

[carbon]

When assembled the bush should securely fixed. The only thing that should be rotating is the bearing

 

[hotponyshoes]

In my haste, i mis-aligned my drift slightly, but im hoping it wont all shatter at speed -

View attachment 505926

I expect the bearing suppliers sell bushes as well

 

[Pete.]

Nah that'll be fine.

In my haste, i mis-aligned my drift slightly, but im hoping it wont all shatter at speed -

View attachment 505926

It'll be just fine. press it back into the new bearing and fit it all up.

 

[Agroshield]

I expect the bearing suppliers sell bushes as well

A router bearing is quite a niche market, so I suspect bushes with a constant ID (to suit the cutter) and variable OD (to suit the bearing) may be a rare commodity.

Another option is to find a single bearing with the correct ID and use an external sleeve to produce the correct offset. That sleeve could be 3DP or made of delrin or nylon.

In theory, the OD of the bearing should only rotate as fast as you push the machine along the workpiece, but that is only true when the sleeve is in contact with something.

 

[julianf]

In theory, the OD of the bearing should only rotate as fast as you push the machine along the workpiece, but that is only true when the sleeve is in contact with something.

The bearing is on the cutter. So it (the center relative to the outer) rotates at the rpm of the cutter, when it outer is held stationary by the work.

 

[Turbo]

I would think that you would need high speed bearings to cope with the 20,000 rpm+ router speed.

 

[Agroshield]

...it outer is held stationary by the work.

Think about what you have written. If the outer is stationary, the body of the router is not moving relative to the piece of wood and all you will do is drill a hole.

The outer does move (unless it skids along the guide surface), albeit only as fast as you push the machine through the wood.

 

[Pete.]

Think about what you have written. If the outer is stationary, the body of the router is not moving relative to the piece of wood and all you will do is drill a hole.

The outer does move (unless it skids along the guide surface), albeit only as fast as you push the machine through the wood.

A truth that didn't really need telling TBH. It was clear what he was trying to convey.

 

[Seadog]

Think about what you have written. If the outer is stationary, the body of the router is not moving relative to the piece of wood and all you will do is drill a hole.

The outer does move (unless it skids along the guide surface), albeit only as fast as you push the machine through the wood.

In relation the the spindle it is stationary.

 

[bricol]

So if a plane is going down the runway to take off, but the runway is actually a belt being driven in the opposite direction, speed matched to exactly match the acceleration of the plane, are the wheel bearings rotating at normal speed, twice speed, or not moving at all?