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Required caster load rating calculator

Engineering calculators (Beta)

Estimate the per-caster rating from cart and payload mass, an assumed effective support count and an explicit load multiplier.

Inputs

Choose units and enter numbers. Full-width digits and fractions such as 1/8 or 1 3/8 are accepted. Changing a unit converts the entered value.

Results

Reference calculation only. Results do not certify suitability for an actual design or its safety.

Diagram

Inputs: select a blue symbol to edit Results: red-orange values and lines

Formula and applicability

W=(m₀+m)g; Creq=kW/nₑ; m_total,max=nₑC/(kg); m_payload,max=max(0,m_total,max−m₀); margin=C/Creq.

Displayed values are rounded. Diagrams illustrate the calculation conditions. Initial material and fluid properties are examples; replace them with values for the actual material, temperature and conditions.

Reference
Using this information as a reference

Equations assume particular loads, supports and deformation ranges. Check inputs, units and the applicability of each equation. Diagrams explain conditions; they are not manufacturing drawings or proof of safety.

Material values are typical values or reference ranges, not certified product properties or ready-to-use design allowables. They vary with standards, product form, dimensions, temper and temperature. Check the specifications and inspection certificates for the actual product.

Displayed safety factors and checks apply only to the supplied inputs and calculation model. They do not automatically establish the safety of a complete design, including code compliance, service life, fatigue or joints. For actual design, manufacture and use, separately verify applicable regulations and standards, product specifications, and the necessary tests and engineering review.

Calculations do not submit input values to a server. Results are not an automatic code-compliance or safety determination.

この計算で求められること

台車自重と積載質量から、想定する支持輪数・荷重倍率に対応する1輪の必要許容荷重を求めます。

入力・結果・適用条件を確認する

主な入力

  • 台車・機器そのものの質量 m₀
  • 積載する質量 m
  • 取り付けるキャスター数 n
  • 計算上で荷重を分担する輪数 nₑ
  • 使用条件から決める荷重倍率 k（例）
  • 比較する1輪の許容荷重 C（例）

得られる結果

  • 1輪に必要な許容荷重 Creq (N)
  • 必要荷重の力換算（kgf。質量kgではない） (kgf)
  • 同じ仮定での積載質量の上限 (kg)
  • 自重と積載を合わせた重力 W (N)
  • 倍率前の1支持輪あたりの仮定荷重 (N)
  • 入力許容荷重／必要荷重 (—)
  • 同じ仮定での総質量の上限 (kg)

W=(m₀+m)g; Creq=kW/nₑ; m_total,max=nₑC/(kg); m_payload,max=max(0,m_total,max−m₀); margin=C/Creq.

nₑ輪で等しく分担するという選定用の仮定です。実際の各輪反力は求めていません。4輪・3輪支持の入力例も、重心の偏りや床のうねりを含む最悪荷重を保証しません。nₑとkは取付状態・荷重位置・床面・段差・速度・牽引・製品指定条件で決め、同じ影響を二重に係数へ入れないよう確認します。k=1.25とC=1000 Nは例です。Cは使用条件に合う許容荷重であり破壊荷重ではありません。走行抵抗、取付板・ボルト、ブレーキ保持、衝突、転倒、床面強度は別に確認します。

関連する計算

What this calculator does

Estimate the per-caster rating from cart and payload mass, an assumed effective support count and an explicit load multiplier.

Inputs, outputs and applicability

Inputs

  • Cart / equipment mass m₀
  • Payload mass m
  • Installed caster count n
  • Assumed effective load-sharing count nₑ
  • Application load multiplier k (example)
  • Entered allowable load C per caster (example)

Results

  • Required allowable load Creq per caster (N)
  • Required load in kgf (force, not mass kg) (kgf)
  • Payload mass limit under the same assumptions (kg)
  • Combined gravity load W (N)
  • Assumed load per supporting caster before multiplier (N)
  • Entered allowable / required load (—)
  • Total mass limit under the same assumptions (kg)

W=(m₀+m)g; Creq=kW/nₑ; m_total,max=nₑC/(kg); m_payload,max=max(0,m_total,max−m₀); margin=C/Creq.

Selection assumption of equal sharing among nₑ supports, not a solution for actual wheel reactions. Even the four-installed / three-effective example does not bound eccentric-CG or uneven-floor reactions. Establish nₑ and k for mounting, load location, floor, steps, speed, towing and product conditions; avoid counting the same allowance twice. k=1.25 and C=1000 N are examples. C is an applicable allowable, not a breaking load. Rolling resistance, mounting plates/bolts, brakes, collisions, tipping and floor strength require separate checks.

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