Compare suction capacity and required holding force
Engineering calculators (Beta)
Match the diagram conditions, then follow the example inputs and results. Change numerical values in the calculator.
1. Match the diagram to your question
上面を2個のパッドで吸着して、下の荷物を保持する例です。
Dはパッドの有効径、Δpは内外の差圧です。個数n・質量m・安全係数Sも指定します。
保持方向
水平面から上向き保持（法線方向）
有効吸着径 D（外径とは限りません）
50 mm
吸着パッド数 n
2
周囲との差圧 Δp
0.06 MPa
周囲の絶対圧 pamb
0.101325 MPa
保持する質量 m
5 kg
上向き加速度 a
0 m/s²
保持力を割り引く係数 S（入力例）
3
安全係数を入れた保持容量と必要な力を比べます。差が正でも、漏れ・剥離・動的な保持は別の確認です。
係数Sを適用した方向別保持力
78.5398 N
荷重・加速に必要な力
49.0332 N
保持力 − 必要な力
29.5066 N
Two pads on the top surface hold the load below.
D is effective pad diameter and Δp is pressure difference. Also specify pad count n, mass m and factor S.
Holding orientation
Lift from horizontal surface, normal load
Effective suction diameter D
50 mm
Number of pads n
2
Vacuum pressure difference Δp
0.06 MPa
Ambient absolute pressure
0.101325 MPa
Held mass m
5 kg
Upward acceleration a
0 m/s²
Capacity reduction factor S (example)
3
Compare factored capacity with required force. A positive difference alone does not check leakage, peeling or dynamic holding.
Directional capacity after factor S
78.5398 N
Required force including acceleration
49.0332 N
Capacity minus required force
29.5066 N
Blue marks inputs; orange marks outputs. These diagrams explain the fixed example below; dimensions and deformation are not drawn to physical scale.
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2. Example inputs
Holding orientationWhat goes here?
Choose the option matching your mechanism and diagram. A different model can change required inputs and applicable results.
Lift from horizontal surface, normal load
Effective suction diameter DWhat goes here?
Use the dimension marked in the diagram. Distinguish radius from diameter, bore from outside diameter, and overall length from support span.
50 mm
Number of pads nWhat goes here?
Match the field symbol to the diagram and check dimensions, specifications or operating conditions. Replace example numbers with your actual conditions.
2
Vacuum pressure difference ΔpWhat goes here?
Force per area. Gauge pressure is relative to ambient; absolute pressure is relative to vacuum.
0.06 MPa
Ambient absolute pressureWhat goes here?
Force per area. Gauge pressure is relative to ambient; absolute pressure is relative to vacuum.
0.101325 MPa
Held mass mWhat goes here?
This is mass, including fixtures or loads that move with it where required. Kilograms describe mass; newtons describe force.
5 kg
Upward acceleration aWhat goes here?
Change in velocity per time. Check signs for acceleration along travel versus deceleration.
0 m/s²
Capacity reduction factor S (example)What goes here?
A reduction factor: this model compares the load against ideal holding force divided by S.
SMC’s values belong to its own equations and conditions, not a prescribed input here. This tool also treats friction μ separately, so compare definitions. The initial 3 is an example, not a guaranteed anti-drop design factor.
Choose values for actual contact, lubrication, temperature and other conditions. These initial values are examples.
3
These are fixed teaching inputs. Coefficients, properties and comparison limits are not recommendations. Enter your conditions in the calculator.
3. Results for this example
Directional capacity after factor S
78.5398 N
Required force including acceleration
49.0332 N
Capacity minus required force
29.5066 N
This example lifts normally from a horizontal surface. Distinguish ideal suction force reduced by S from force required by weight and acceleration.
Table units are not always the units required in the formula. The calculator converts selected units to its internal base units before computing.
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Assumptions and exclusions
Static estimate with equal load sharing and maintained seals. Choose S and friction from actual conditions; defaults are examples, not recommendations. Peeling, leakage, eccentric loads, response, deformation and product ratings are excluded. A positive difference is not a safety approval; verify on the real system.
