Home / myonic / Docs

Positioning / Lubrication Hole

AXRY-NGX Series

Positioning Hole

For error-free positioning of the lubrication hole of the bearing to the lubrication hole in the machine housing, the AXRY-NGX bearings have a so-called locating pin hole (1) on the outer ring.

The following sketch shows the fastening screw (4) and the bearing mark on the inner ring lying on top. The axial washer is installed on the table.

Positioning hole design diagram
Figure: Locating pin hole design schematic
Bearing positioning hole
Figure: AXRY-NGX bearing positioning hole location

Hole Position Relationship

  • The positioning hole (1) is offset by half a pitch division to the fixing hole (3)
  • The positioning hole (1) is offset by one whole pitch division to the lubrication hole (2)
  • The pitch divisions in the individual bearings are listed in the product data sheet in the "Fixing holes" table

The diameter dPB of the positioning hole of the bearing outer ring is designed slightly larger than the recommended pin diameter dST (see table).

Positioning Hole Design for the AXRY-NGX

Important Note

Secure the positioning pins appropriately during assembly. The pins must be reliably prevented from dropping out in operation.

AXRY Pin height
hmax [mm]		 Pin diameter
dST [mm]		 Positioning hole
dPB min. [mm]
AXRY 180-460-NGX 4 4 5
AXRY 580-NGX 6 6 8
AXRY 650-NGX 8 8 10

Symbol Description:
hmax = Maximum pin height
dST = Recommended pin diameter
dPB min. = Minimum positioning hole diameter

Lubrication Hole Configuration

NGX (Rotating Inner Ring)

NGX bearings for a rotating inner ring can be lubricated either radially through the annular groove on the outer ring or axially.

Radial Lubrication

  • Through the annular groove on the outer ring
  • The housing lubrication channel should be close to the radial lubrication hole of the bearing
  • Suitable for connection to the machine tool central lubrication system

Axial Lubrication

  • Through the end face of the outer ring
  • The axial holes are closed with plugs upon delivery
  • Remove the plugs when using axial lubrication

Note

Upon delivery, the axial lubrication holes are closed with plugs. For axial lubrication, remove the plugs axially and close the holes radially.

NGX-SBI (Rotating Outer Ring)

NGX-SBI bearings for a rotating outer ring are lubricated radially through the annular groove on the inner ring.

NGX-SBI Lubrication Characteristics

  • Radial lubrication only (through the inner ring)
  • The bearing lubrication hole should be close to the housing lubrication channel
  • Suitable for applications with a stationary shaft and rotating outer ring

Lubrication Groove Filling Recommendation

For relubrication through the outer/inner ring lubrication groove, it is recommended to completely fill the lubrication groove with grease before installing the bearing.

Advantages

  • Grease can enter the bearing more quickly during relubrication
  • Reduced friction during initial operation
  • Ensures the lubrication channel remains clear

Filling Guidelines

  1. Use the same type of grease as the bearing
  2. Ensure the lubrication groove is clean and free of foreign matter
  3. Fill the entire annular groove evenly
  4. Avoid overfilling, which may make installation difficult

Relubrication Recommendations

Item Recommendation
Relubrication interval Typically once per year
After relubrication Perform a running-in cycle
Lubricant quantity Email sales@eb-system.com
Grease type Standard: DIN 51825-KPH-C1N-30

Over-Lubrication Warning

Over-lubrication directly leads to increased bearing friction and a significant temperature rise, which may cause premature bearing failure. If the bearing has been over-lubricated, repeat the running-in cycle to restore the original frictional torque.

ESC