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spindle bearings

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Kevin Bennett13/10/2013 17:48:37
161 forum posts
28 photos

hi my spindle bearings are shot in my Chester Champion Mill the Chinese bearings have lasted 12 years the question is do I fit like for like, the angular bearings 30x55x13.

or do I modify the spindle and fit taper bearings 30x55x17

any suggestion please

ty Kevin

John Rudd13/10/2013 18:22:43
1366 forum posts
58 photos

I fitted tapers to my Chester Conquest when I went to a belt drive........

Kevin Bennett13/10/2013 19:27:18
161 forum posts
28 photos

hi John did you have to modify the spindle for the extra 4mm taken up with the taper bearings

John Rudd13/10/2013 21:18:15
1366 forum posts
58 photos


the only mod I had to make was ensure the inner races were a tight sliding fit on the spindle to ensure that they could be preloaded.

John McNamara14/10/2013 00:18:38
1309 forum posts
113 photos

Hi Kevin

If you do a lot of high speed machining angular contact bearings will run cooler. They are pretty much the "standard" bearing for machining centre spindles. If you do use taper roller bearings check the maximum speed rating for the bearing you select to make sure it is within spec.

The twelve years you got from the Chinese angular contact bearings was a pretty good run. They clearly were able to cope with the loads you imposed on them.

Lubrication is important! Don't be tempted to use plain old automotive wheel bearing grease. Get the manufacturer recommended lubricant for your selected bearings, you may need to sit down when they tell you the price. Maybe you can share the cost with a mate.


Kevin Bennett14/10/2013 13:04:32
161 forum posts
28 photos

John that for that I will keep it standard as it has lasted this long all the best


Kevin Bennett17/10/2013 17:28:02
161 forum posts
28 photos

OMG I have just jot the cost for my 2 off mill bearings, when I picked myself up from the floor what a rip off from a UK supplier Part No: 7006 Single Row Angular Contact Bearing Brand: NTN or equivalent Quantity: 2 Price each: £75.50 total £151.00.

I called Chester machine tools with no luck all they said was we do not stock or sell them is this the case for Chinese machines'

looked at most UK bearings suppliers and on eBay in the UK they do not stock the size 30x55x13 the US & China have them but are as good as they look

as for my first post do I change to tapper bearing to keep the cost down

thanks Kevin

Richard Marks17/10/2013 17:56:43
184 forum posts
8 photos


First thing to do is contact Arc Euro Trade and Keiran will help you to decide and will supply the correct bearings,

I have no association with them but have always got good advice and good prices.


jason udall17/10/2013 18:02:06
2011 forum posts
41 photos
When you see the price of bearings you might have doubt about the ones " built in" in first place
mgnbuk17/10/2013 18:11:57
516 forum posts
13 photos


Under £30 each here - and they are precision bearings as well


Edited By Nigel Barraclough on 17/10/2013 18:12:15

John Rudd17/10/2013 18:36:32
1366 forum posts
58 photos

I paid £20 for a pair of quality bearings from a local bearing supplier when I changed them.....Best bet is Arc.....usual disclaimer.... Just a happy bunny

Kevin Bennett17/10/2013 19:23:03
161 forum posts
28 photos

hi Nigel the Bearing boys are not Single Row Angular Contact Bearing I have looked and researched it

thanks Kev

mgnbuk17/10/2013 19:35:50
516 forum posts
13 photos

7006-CSUP4 Precision Ball Bearing Single 30mm x 55mm x 13mm

  • Precision grade - P4
  • 15 degree contact angle
  • Single bearing


Only one type of 7006 single row angular contact bearing -

in your position, that is the one I would be ordering.



Edited By Nigel Barraclough on 17/10/2013 19:36:09

Ketan Swali17/10/2013 19:54:34
1116 forum posts
91 photos


Funny enough, I will be needing to order one of these for myself.

There are two+ grades. The ones in your mill are standard and not high precision. I will be needing the high precision 7006 for my KX3 mill in our workshop because of CNC higher speed requirement, but still not super high precision.

If you want, give me a call in the morning. I will check for you when I am ordering mine. Also, stick with the angular contact ball bearing. The choice is yours standard or high precision. In your mills case, no special grease necessary. Just don't overload it with the grease.

Ketan at ARC.

Richard Marks17/10/2013 20:58:01
184 forum posts
8 photos


Sorry meant Ketan not Keiran, age you know!


Kevin Bennett17/10/2013 21:07:23
161 forum posts
28 photos

thanks for that I have already sent a pm to Ketan

TY Kevin

John McNamara17/10/2013 23:49:40
1309 forum posts
113 photos

Hi Keven

VXB Bearings (US) list them for about $14.00 Standard grade
They will also supply high spec if required

I do wonder about using super precision bearings on a conventional mill? OK if you have a temperature controlled high spec mill. that will no doubt be fitted with a cartridge spindle that has been fitted with high spec bearings and then the taper ground in situe before being tested for run out, greased up and certified.

The difference between super precision and commercial grade bearings is only a tenth or two these days, the main thing as mentioned before is that the speed and load rating for the particular bearing chosen is appropriate.

Maybe the cost premium for super precision could be better spent elsewhere?

The will ship anywhere....

I have no connection to them


Edited By John McNamara on 18/10/2013 00:02:43

Michael Horner15/06/2019 08:51:58
202 forum posts
55 photos

Hi Kevin

How did you get on with your bearing replacement?

I am in a similar position with my KX3, it took a hard dive into the job and took out the bearings.

Cheers Michael

RMA15/06/2019 09:10:50
199 forum posts
4 photos

Interesting debate here. When you say they have lasted for 12 year's, how much work have they actually done in that time, and at what sort of loads? I'm a firm believer in taper roller bearings, you can preload and adjust, but these day's quality doesn't come cheap. However, if you use the machine a lot then the cost is well worth it. The machine is virtually useless if the spindle doesn't run true.

Ian S C15/06/2019 12:25:40
7447 forum posts
230 photos

Just follow Ketan's advice, he knows bearings.

Ian S C

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