Bearing

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Bearing

Postby martin007 » 19 Dec 2020, 20:46

Hello.


Soon I'll have to be a mechanic in my powerchair.
Some bearings need replacement.
The first step is to identify the technical name of the bearings.

They are bearings similar to this one.
rodamiento.png
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Re: Bearing

Postby Burgerman » 19 Dec 2020, 21:54

I dont know. That is not a standard bearing.
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Re: Bearing

Postby martin007 » 19 Dec 2020, 21:56

You hit the nail.
It is not a common bearing.
That's the problem.
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Re: Bearing

Postby ICEUK » 19 Dec 2020, 22:06

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Re: Bearing

Postby martin007 » 19 Dec 2020, 22:19



No.
The length of the cylinder (added) is approximately twice that of the bearing.
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Re: Bearing

Postby Burgerman » 19 Dec 2020, 22:25

Where is it used? Any drawing?
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Re: Bearing

Postby martin007 » 19 Dec 2020, 22:26

Front wheel fork attachment.
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Re: Bearing

Postby martin007 » 19 Dec 2020, 22:38

> https://www.mobinova.nl/en/ball-bearing ... heels.html

maslargo.jpg


With the longest (marked) cylinder.
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Re: Bearing

Postby Burgerman » 19 Dec 2020, 22:49

Well you will either have to pay it or use a spacer.
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Re: Bearing

Postby martin007 » 19 Dec 2020, 23:04

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Re: Bearing

Postby Burgerman » 20 Dec 2020, 00:01

No thats a bearing of some type used on a longboard in this case. You need to know the size too. Yours are bigger. Measure to closest mm ID, OD and width.
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Re: Bearing

Postby martin007 » 20 Dec 2020, 00:10

Now I have an idea of how to look for the bearing.
I'll keep you informed.
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Re: Bearing

Postby ex-Gooserider » 22 Dec 2020, 02:56

There should be a number or set of numbers on the bearing, you may need to clean it thoroughly and / or use a magnifying glass or play with lighting in order to read them. Put those numbers into a search engine, and you will probably get links to bearing supply houses...

Those numbers will describe the bearing if it is an industrial standard one (most are). Worst case, pull one out and take it to a bearing supplier (most decent sized cities will have at least one)...

Most bearings don't have an extension like the one you have in the picture, if you can't find one that does have the extension, you may need to get a spacer or have one made to account for the difference. Aside from possibly being more of a pain to put together, this won't hurt anything, and bearings w/o the extension are likely to be less expensive.

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Re: Bearing

Postby martin007 » 22 Dec 2020, 19:03

I think an alternative would be to place 2 normal bearings instead of the current one.

What do you think?
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Re: Bearing

Postby woodygb » 22 Dec 2020, 19:32

Use a Standard bearing plus a suitable spacer to make up the difference.... using another bearing as a spacer could work but ...YUCK!
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Re: Bearing

Postby martin007 » 22 Dec 2020, 19:39

woodygb wrote: using another bearing as a spacer could work but ...YUCK!




Can you extend it a little more?
What problems can there be?
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Re: Bearing

Postby Burgerman » 22 Dec 2020, 20:13

None if that will fit.
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Re: Bearing

Postby martin007 » 22 Dec 2020, 20:18

In theory (it seems) that there are 2 long bearings on top of each other.
I wonder.

Why?
Do engineers like to complicate life?
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Re: Bearing

Postby Burgerman » 22 Dec 2020, 20:23

Who knows. They may well use 2 on top, so the spacers allow you to tighten the bolt/nut and not load the mearings. You can do the same thing with 2 spacers.
You ca make two spacers by taking apart a nomal bearing and using just the centre part. Add grease so it all comes apart later without rust...
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Re: Bearing

Postby martin007 » 22 Dec 2020, 20:35

imagen_2020-12-22_202749.png
imagen_2020-12-22_202749.png (4.26 KiB) Viewed 1350 times


I think (I will confirm later) that the long bearings are placed like this.
The black part is a screw that holds the wheel.

imagen_2020-12-22_203436.png
imagen_2020-12-22_203436.png (44.84 KiB) Viewed 1350 times
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Re: Bearing

Postby martin007 » 22 Dec 2020, 21:11

bearings.jpg
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Re: Bearing

Postby woodygb » 22 Dec 2020, 22:46

Image

That part of the caster is called a stem.
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Re: Bearing

Postby martin007 » 22 Dec 2020, 23:05

Any idea why 2 bearings?
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Re: Bearing

Postby biscuit » 22 Dec 2020, 23:15

@Martin: are you looking for bearings for the castor stem or for the middle of the wheel? Or both places?
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Re: Bearing

Postby martin007 » 22 Dec 2020, 23:21

for the castor
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Re: Bearing

Postby woodygb » 23 Dec 2020, 00:08

martin007 wrote:for the castor
That statement still doesn't make things clear Martin...

The word "Castor" usually applies to the assembly including the wheel...
cas·tor (kăs′tər) A small wheel on a swivel, attached under a piece of furniture or other heavy object to make it easier to move.


So ... Bearings are for ?....Going ON the STEM or going IN the WHEEL or for BOTH ?
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Re: Bearing

Postby martin007 » 23 Dec 2020, 00:18

Sorry.

The bearings are for the STEM.
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Re: Bearing

Postby biscuit » 23 Dec 2020, 17:41

https://www.bilcastors.co.uk/product-ca ... ng-spacer/
This company might have a part you need? Or eBay might have entire wheelchair castors that fit?
I don't seem to have swivel bearings on my castor stems. But I suppose I must have.
I have just put a pair of castors from my old chair in the tip. You might be lucky if you look for complete replacement castors in eBay.
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Re: Bearing

Postby martin007 » 23 Dec 2020, 20:19

The wheels are in perfect condition.
I'll get to work next week.
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Re: Bearing

Postby iainsherriff » 23 Dec 2020, 23:34

do you KNOW the correct bearing is 608ZZ ?
22 x 7 x 8 maybe the right physical size but a bearing on the stem in that position should be a taper roller not a ball bearing, unless there is a thrust bearing as well ?
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