• Hello Customer - Log in or Register!

Buy Thin Section Angular Contact ball bearings

Country:
Singapore
Posted Date:
Dec 22, 2012
Expiry Date:
Apr 22, 2013

Dear Sir

We request you to quote for the following items which are mentioned in each column. We also request you to comply the technical specifications which you are offering against each line.

RFQ NO. 748
 

SL. No

UMAC SPECIFICATIONS

QTY

PRICE

SUPPLIER’S OFFERED SPECIFICATIONS

Thin Section Angular Contact ball bearings

 20 pairs

 

 

1

Description

 

 

 

1.1

Type

 

 

 

Non-separable, non interchangeable, thin angular contact ball bearings as matched pairs with built in pre load

 

 

 

1.2

Application

 

 

 

These bearings shall be suitable for jitter free operation of 25 rpm(inner race revolving)under an axial pre-load of 100N±10N in face to face(DF)mounting. Operating is -10° to +70° C under hard vacuum of more than 10⁻⁶ torr and shall be suitable for spacecraft application of more than 10 years life without degradation in performance

 

 

 

1.3

Dimensions

 

 

 

 

Bore diameter

80 mm

 

 

 

 

Outer diameter

100 mm

 

 

 

 

Width

10 mm

 

 

 

1.4

Cage

One piece machined type with cylindrical ball pockets

 

 

 

1.5

Contact angle

15±2°

 

 

 

1.6

Pre-load

100N±10N when Face to Face mounted

 

 

 

2

Tolerances

 

 

 

 

 

Ring

ABEC-7P

 

 

 

 

Ball

Grade 3 AFBMA standard

 

 

 

3

Materials

 

 

 

 

 

Rings and balls

AISI 440 C, Consumable Electrode

 

 

 

 

Cage

Cotton based phenolic

 

 

 

4

Engineering data

 

 

 

 

 

Static radial load rating

9950 N

 

 

 

 

Static thrust load rating

25400 N

 

 

 

 

Basic dynamic capacity

8700 N

 

 

 

5

Passivation and TCP Treatment

Balls and rings should be subjected to Passivation and TCP treatment so that the rings and balls highly wettable

 

 

 

6

Lubrication

 

 

 

 

 

Lubricant

By thin film of Nye-2001A-T oil

 

 

 

 

Vacuum oil impregnation of cages

By Nye-2001 A-T oil

 

 

 

7

Barrier film coating

 

 

 

 

The barrier film coating, suitable for Nye 2011A-T oil to be applied on the bearing faces to prevent oil migration.

 

8

Visual inspection and Wettability test

 

Inner race, outer race and cage ball pockets are to be inspected under 30X magnification for defects like pits, dents, Brinell marks, scratches, burrs, foreign particles poorly bonded particles etc. The critical areas(contact area) shall not have any defects mentioned above.

Rings and balls are to be checked for Wettability after Passivation and TCP treatment. It shall be ensure that the rings and balls are highly wettable by maintaining proper chemical cleanliness.

 

 

9

Torque testing

 

All assembled bearing pairs shall be tested for low speed torque trace. The torque shall be low (250gmcm maximum per pair) and uniform with least hash width(less than 20% of mean torque)

Test Conditions:

·         Shaft axis of the pair to be vertical

·         Rotating inner ring

·         Rotating speed  :  2rpm

·         Addition axial load on the preloaded pair : 50N approximately

In both directions of rotation, one revolution in clock-wise and one revolution in counter clockwise shall be traced and supplied

 

10

Packaging

 

Each bearing shall be individually packed in envelope with excess lubricant. Package shall be suitable for long term storage.

 

11

Documentation

 

1

Bearing bore, COD and inner race width to the nearest of 0.5 micron

 

2

Nominal  osculation of inner and outer race grooves with respect to ball diameter

 

3

Nominal Ball size and Number of balls

 

4

Bearing Load rating(static radial, static thrust and dynamic)

 

5

Nominal cage dimensions (ID, OD, Width, Pocket diameter)with tolerance

 

6

Batch properties of the cage material used

 

7

Typical dry weight and quantity of oil rented after impregnation(after 75g centrifuge for 2 min at ambient) for the cages to the nearest of 0.1 mg

 

The purchasing information has expired