9.1 Tolerance of the Supporting Surface to the Track
Tolerance of the supporting surface to the track
In addition to the geometric precision as set out in chapter 7.1, SCHNEEBERGER guideways are also manufactured to the dimensions of the supporting surface in relation to the track within a very tight tolerance (+/- 0.005 mm).
Advantages:
- Interchangeability is guaranteed at all times
- In most cases, additional matching of the guideways is surplus to requirement
9.2 Length Tolerances and Distances Between Fixing Holes
Length tolerances and distances between fixing holes
| Length L ≤ 300 mm: | ±0.3 mm |
|---|---|
| Length L > 300 mm: | ±0.1% of L |
| Hole pitch L1: | ±0.3 mm |
| Mass Xn ≤ 350 mm: | ±0.3 mm |
| Mass Xn > 350 mm: | ±0.08% of xn |
The fixing holes are manufactured before the hardening process, which is why the length tolerances and spacings differ from the usual standards. The deviations can be offset using undercut fastening screws of type GD or GDN (see chapter 5) and/or by choosing a suitable hole (see chapter 7.10).
9.3 Operating Temperatures
Operating temperatures
SCHNEEBERGER linear guideways can be used at operating temperatures from –40 °C to +80 °C. For brief periods, temperatures up to +120 °C are possible.
9.4 Speeds and Accelerations
Speeds and accelerations
The following limit values apply for the standard designs:
| Product | Max. speed | Max. acceleration |
|---|---|---|
| Linear guideways R, RD, RN, RNG, N/O and M/V | 1 m/s | 50 m/s² |
| Linear guideways RN and RNG with cage control FORMULA-S | 1 m/s | 300 m/s² |
| Linear guideways N/O and M/V with cage control | 1 m/s | 200 m/s² |
9.5 Friction, Running Accuracy and Smoothness
Friction, running accuracy and smoothness
When manufacturing the linear guideways, SCHNEEBERGER places great value on a high level of smoothness. Transitions, run-ins and run-outs or the quality of the synthetic materials and synthetic composite cages are given top priority. This also applies to the rolling elements used, which must satisfy the most stringent quality demands.
For guideways with cages under normal operating conditions, a friction factor of 0.0005 to 0.0030 can be assumed.