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Required gripping force for two jaws calculator

Engineering calculators (Beta)

Find normal gripping force per jaw for a vertically held object.

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=m(g+a); Nreq=kW/(2μ); Ffriction=2μNₐ; margin=Nₐ/Nreq.

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.

この計算で求められること

縦に保持する物体の質量・加速度・摩擦から、片爪あたりの把持力を求めます。

入力・結果・適用条件を確認する

選択した形状・計算方法により、使う項目は変わります。実際の計算は上の図と入力欄で行えます。

主な入力

  • 保持する質量 m (kg / g / mg)
  • 上向きの最大加速度 a(静止は0) (m/s² / mm/s² / g)
  • 爪と物体の摩擦係数 μ (—)
  • 荷重に掛ける比較倍率 k (—)
  • 実際の把持位置での片爪の把持力 Nₐ (N / kN / mN)

得られる結果

  • 必要な片爪把持力 Nreq (N)
  • 両爪の把持力の合計 (N)
  • 倍率を掛ける前の下向き荷重 W (N)
  • 両接触面の摩擦力の上限 (N)
  • 把持力の比較余裕(実力/必要力) (—)

計算式の概要

W=m(g+a); Nreq=kW/(2μ); Ffriction=2μNₐ; margin=Nₐ/Nreq.

2爪が等しい垂直面を外側からつかみ、重心が中央にある理想的な摩擦保持です。Nは片爪の面に垂直な力です。把持力の合計や駆動シリンダー推力と混同しないでください。aは上向き加速または下降時の減速の最大値。k・μ・把持力は実条件から入力します。偏心モーメント、爪のたわみ、接触面圧、衝撃、停電・供給圧低下、落下防止は別に確認します。

現在選択中の方法には、操作欄の「計算式・適用条件」を使ってください。参考計算であり、設計全体の安全性を保証するものではありません。

関連する計算

What this calculator does

Find normal gripping force per jaw for a vertically held object.

Inputs, outputs and applicability

The selected model determines which of these inputs and outputs apply. Use the working diagram and input panel above to calculate.

Inputs

  • Held mass m (kg / g / mg)
  • Maximum upward acceleration a (0 at rest) (m/s² / mm/s² / g)
  • Jaw / object friction coefficient μ (—)
  • User-selected load multiplier k (—)
  • Available normal force Nₐ per jaw at actual grip position (N / kN / mN)

Calculated results

  • Required normal force Nreq per jaw (N)
  • Sum of both jaw normal forces (N)
  • Downward load W before multiplier (N)
  • Combined limiting friction force (N)
  • Grip comparison margin (available / required) (—)

Formula overview

W=m(g+a); Nreq=kW/(2μ); Ffriction=2μNₐ; margin=Nₐ/Nreq.

Ideal symmetric external pinch on two vertical faces, with centred CG. N is normal force per jaw, not total gripping force or cylinder thrust. a is maximum upward acceleration / deceleration while lowering. Select k, friction and available force for the actual conditions. Eccentric moments, jaw deflection, contact pressure, impact, loss of supply and fall protection are separate.

The displayed formula and conditions in the working panel apply to the currently selected model. Reference calculation only; it does not certify a complete design.

Related tools

目的から順に確認する設計ガイド

図で条件を整理してから計算し、最後に実際の部品仕様を確認します。

Purpose-based design guides

Understand conditions with diagrams, calculate, then verify actual specifications.

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