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Application Conditions

Running Accuracy parallelism deviation Δ of the running surface vs guideway length

Curves digitised from the SCHNEEBERGER catalogue accuracy charts. Running accuracy = maximum parallelism deviation Δ of the running surface to the reference surface, rising with guideway length; stroke is used here as an approximation of length, the selected grade is shown in wine red. Guideways use G0–G3 (0–6000 mm), linear bearings NQ/SQ/SSQ (0–1000 mm) — two independent scales.

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※ Ratings are for one carriage / one set. If your axis has several carriages, each carriage’s share must be determined from the actual layout and load position; with uneven loading do not simply average.

Recirculating units are linear bearings that consist of the carriage only, without a guideway; the rolling elements recirculate inside the unit for unlimited stroke, and the unit must be mounted on the matching guideway to form a system: SR cross roller (with R/RD, heavy load), NRT roller (NRT + NRV preload wedge + guideway = three separate elements), SK/SKD ball, SKC ceramic ball (vacuum/cleanroom). The catalogue gives only the dynamic load C₁₀₀, no static load C₀, so S₀ is not used; life L₁₀ = (C₁₀₀/P)^p×10⁵ m (roller p = 10/3, ball p = 3). “Suitable” requires C₁₀₀/P ≥ the condition S₀ threshold (same threshold as guideways, to avoid recommending very short-life options); units below it are tagged “low margin” but still listed. Running accuracy depends on the guideway, not the unit, so this table is not filtered by accuracy — anything that carries the load is listed; NRT can also be ordered as a matched set (dimensional sorting ±5 µm for multi-row mounting, not running accuracy).

MINISLIDE is a complete slide unit (guideway + carriage + ball cage in one, ball p = 3); the stroke is fixed per part (type suffix = system length.stroke, e.g. MS 5-30.20 = system length 30 mm, stroke 20 mm). Judged by the static safety factor S₀ = C₀/P (same condition threshold); running accuracy Δ = straightness by system length (10–30 → 3, 40–80 → 4, 90–130 → 5 µm, 13.3.4). C₀/C₁₀₀ from catalogue 13.3.8 (MSQ 15 from the same table of the MINI-X catalogue, cross-checked against MSQ 12). Speed limit MS 1 m/s, MSQ 3 m/s; all zero backlash, vacuum / cleanroom capable.

This table lists only the (guideway type × size × cage) combinations judged “suitable” — unsuitable ones (guideway / cage too long, stroke over) are hidden. Each row = one specific guideway size + cage: the element count R_A is computed from your load, the minimum guideway length from the stroke, and snapped to the orderable standard length for that size (min = computed minimum). Choose the size by the machine’s guideway section / space; several cages (roller / ball) of the same size are listed on separate rows for comparison.
The linear-bearing chapters give no S₀ safety-factor table — the static criterion is equivalent load per element ≤ C (no plastic deformation, see 12-1); so R_A is the smallest count with P_e = F/(2·R_A) ≤ C (R_A = ⌈P/(2C)⌉); cage length K = (R_A−1)·t + 2w; life L₁₀ = (C/P_e)^p×10⁵ m (roller / needle p = 10/3) — add elements for longer life. Minimum guideway length L = max(H/L ratio term, K + H₁) — per 11.1: stroke < 400 → L ≥ H/0.7, > 400 → L ≥ H, and K ≤ L − H₁ must fit (H₁ = H/2, stops mount on the table, not the cage). Running accuracy Δ is the value of the selected grade (NQ/SQ/SSQ) at that minimum guideway length. All usable cages are listed per type: R/RD with AC · AA-RF · EE (roller) and AK (ball, lower C, p = 3); RN/RNG with KBN · KBS; N/O · M/V with SHW · HW. C₁₀₀/t/w come from the linear-bearing data source (needle SHW/HW offset w backfilled from the Linearbearings catalogue cage dimension tables). Check the actual size against mounting space and moments.