ball bearings

Depends on the type of bearing. What kind of bearings are you talking about?

i am talking about ball bearings 6325 what should be acceptable interferance fit on shaft and inner race of bearing

Hello trev1

Please refer to the selection process: http://www.mapro.skf.com/mp3000e.htm

Then look at: http://www.pacamor.com/technical/shafthousing.php

If you are still in need of help after those, reply here, with

Kind Regards....

All excellent sources.

I'm fondest of the data published in the FAG Standard Program catalog.

i find its format easiest to read.

Contact:

Are you sure that the part number is 6325? Is this a deep groove ball bearing, an angular contact ball bearing, a roller bearing? Also, what is the bore of the bearing that you have? The last two numbers of a metric bearing part number indicate the bore size as follows:

00 10mm
01 12mm
02 15mm
03 17mm
04 20mm
05 25mm
12 60mm
20 100mm

Once you get above 04, you multiply the last two numbers by 5 to get the bore in millimeters. A bearing that has 25 as the last two numbers would indicate that the bearing has a 125mm bore. A 6300 series bearing is a medium duty radial ball bearing, but I was unable to find a manufacturer who makes a 6325.

Do you know who the manufacturer is? All bearing manufacturers should furnish housing and shaft size tolerances, so if you know the manufacturer, you should be able to find this info. If the bearing is a standard number, you can cross reference it to any manufacturer for this information as well, but the first place to start is with the manufacturer of the bearing you have.

dear sir,

we are Changzhou JinQiu Bearings Factory, which is a professional bearing manufacturer in china. And Our main products are deep groove ball bearings. So if in any need of our service, please feel free to contact us. We will satisfy you with the top quality bearings and the most competitive price.

Our website is: www.jqbearing.com

Thanks & Best regards

Amanda

Email: amanda831105@foxmail.com

I'd refer back to the PDF I have on my desktop "Engineering - Basis of Selection for Fittingpdf_tech_p1379.pdf"

Now, if I knew how to attach a PDF, I'd do it ;o)

What is the application? For instance a shaft and bearing for a rock crushing operation will have different requirements than the shaft and bearing of a water pump.

it is for a 2mw generator.it is for the rotor shaft

Hello trev1

Your 6325 bearing is presumably a Deep Groove Ball Bearing (6000 series) - {information from a bearing distributor reference website in China}.

However, like 8320 above, I have not been able to locate a manufacturer of a ball bearing with the number 6325.

You say it's <"....for a 2mw generator.it is for the rotor shaft....">

2mw = 2 milliwatts - a very small generator....

Do you mean 2MW = 2 Megawatts?

Advise further details please:

1. Make of generator
2. Model of generator
3. Horizontal shaft
4. Vertical shaft
5. Where the 6325 bearing is located on the shaft
6. Is the 6325 bearing part of the main generator?
7. Is the 6325 bearing part of the main exciter?
8. Is the 6325 bearing part of the primary (control exciter)?
9. Does the 6325 bearing carry end loading (such as the lower end of a vertical shaft)?
10. Is this generator in a ship, windmill, other - advise please.
11. Motive force: Diesel, steam turbine, geared windmill, other - advise please.
12. RPM of the 6325 bearing, under normal conditions.
13. Any other useful advice - thanks.
    

Note that depending on your answers, a 2MW generator would normally weigh some 50 tons, of which the rotor would weigh at least 25 tons, and would not rely on a ball-bearing to support that sort of mass.

Thus most alternators of that size, if operating with a vertical shaft, would use white-metal kidney type bearings, which rely on pumping oil at high pressure to lift the rotor/turbine assembly, before rotation can commence, at which point the bearings tilt and self-lubricate by self-drawing the lubricating oil across the surface.

Likewise, if that rotating weight was with a horizontal shaft, white-metal type bearings would normally be used, with once again, pressurised oil feed.

Reply here, with

Kind Regards....

oops it is for a 2megawatt genset caterpillar sitting in a 40 feet container on air filled rubber wheels

Every manufacturer has a standard for this details.