General Information
The accuracy of the fits and the geometrically correct design of all connecting parts have a direct effect on the running accuracy and the dynamic properties of the bearing and the table.
Please observe the construction notes in the general catalogue chapter.
The actual dimension of the bearing outer diameter can be found in the inspection report included with each bearing.
Outer Ring Stationary (NGX Series)
For the NGX series housing, design a clearance fit according to G7, or dispense with centering. The housing fit serves mainly for centering, while the bearing is secured by bolts.
Outer Ring Rotates (NGX-SBI Series)
For the NGX-SBI series housing, design according to the J6 specification in the table below. For special requirements, the fit must be further restricted within the specified tolerance grade:
- High accuracy requirements: If maximum accuracy is required, aim for a clearance fit target value of 0. Otherwise, the clearance fit can add itself to the radial runout of the bearing.
- High dynamic properties: At higher speeds and longer duty cycles, the interference fit must not exceed 0.005 mm.
Housing Fit Recommendation Diagram
(Click the image to enlarge)
1 The envelope condition Ⓔ applies here
2 Note the countersinking of the threads
3 Note the bearing diameter D1 in the drawing or the data sheet; ensure that there is sufficient distance between the rotating bearing rings and the adjacent construction
4 It is possible to dispense with a fit in the housing, or alternatively to choose a G7 fit
Housing Tolerance Specifications
- øDa: Nominal housing bore diameter (= bearing outer diameter, mm)
- G7: Housing tolerance band for stationary outer ring (upper / lower deviation, mm)
- J6: Housing tolerance band for rotating outer ring (upper / lower deviation, mm)
- J1: Pitch circle diameter (mm)
- øD1min: Minimum shoulder diameter (mm)
- T1: Roundness tolerance (µm)
- T3: Perpendicularity tolerance, housing end face relative to housing bore axis (µm)
- Rmax: Maximum corner radius (mm)
| Bearing Model | øDa1 [mm] | Stationary Outer Ring Tolerance G74 upper / lower [mm] | Rotating Outer Ring Tolerance J6 upper / lower [mm] | Pitch Circle2 J1 [mm] | Shoulder Diameter3 øD1min [mm] | Roundness T1 [µm] | Perpendicularity T3 [µm] | Max. Corner Radius Rmax [mm] |
|---|---|---|---|---|---|---|---|---|
| AXRY 180-NGX | 280 | +0.069 / +0.017 | +0.025 / −0.007 | 260 | 244.5 | 8 | 8 | 0.1 |
| AXRY 200-NGX | 300 | +0.069 / +0.017 | +0.025 / −0.007 | 285 | 274.5 | 8 | 8 | 0.1 |
| AXRY 260-NGX | 385 | +0.075 / +0.018 | +0.029 / −0.007 | 365 | 345.5 | 9 | 9 | 0.3 |
| AXRY 325-NGX | 450 | +0.083 / +0.020 | +0.033 / −0.007 | 430 | 415.5 | 10 | 10 | 0.3 |
| AXRY 395-NGX | 525 | +0.092 / +0.022 | +0.034 / −0.010 | 505 | 486.5 | 11 | 11 | 0.3 |
| AXRY 460-NGX | 600 | +0.092 / +0.022 | +0.034 / −0.010 | 580 | 561 | 11 | 11 | 0.3 |
| AXRY 580-NGX | 750 | +0.104 / +0.024 | +0.038 / −0.012 | 720 | 701 | 13 | 13 | 1 |
| AXRY 650-NGX | 870 | +0.116 / +0.026 | +0.044 / −0.012 | 830 | 801 | 15 | 15 | 1 |
Notes
- The actual dimension of the bearing outer diameter can be found in the inspection report included with each bearing
- Fit accuracy directly affects the running accuracy and dynamic properties of the bearing
- Ensure sufficient clearance between the rotating bearing ring and the adjacent construction
- If in doubt, email sales@eb-system.com
For detailed housing fit technical data, please refer to: NGX Housing Fit Recommendation PDF