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Linear Ball Bearings Calculator

View all Linear Ball Bearings Products

1. Mounting Orientation Required Please select an orientation.

Floor Mount Horizontal Axes
Vertical Axes
Wall Mount Horizontal Axes

Reset All Metric / Inch

2. Specify Dimensions Required Please enter required parameters.

Linear Bushing Span

Diagram of the span dimensions

Diagram of the span dimensions

Diagram of the span dimensions

X mm in required
Y mm in required

Center of Mass

Diagram of the center of mass

Diagram of the center of mass

Diagram of the center of mass

X₀ mm in required
Y₀ mm in required
ℓ₁ mm in required
Applied Load W N N required

3. Calculate Basic Dynamic Load Rating Required Please enter required parameters.

Required Total Life i

𝑖 Required Total Life

Generally, between 5 to 10 years of repeated use. When a Linear Bushing is loaded in reciprocating motion, scaly damage called flaking appears due to material fatigue as the stress works on the rolling elements and rolling contact surfaces constantly. Rated Life is the total travel distance that 90% of Linear Bushings of the same type can reach, under the same conditions, with no occurrence of flaking damage.

Note: One Cycle is considered a travel of the full stroke and then back again. (2 x stroke)

Distance
Hours

Required Total Life L km km required

Life Span Hours L_H hr hr required
Stroke Length ℓ_s mm in required
Cycles Per Minute n₁ cpm cpm required

Parameters

Working Load (calculated) i P N N required

𝑖 Working Load

Linear Bushings perform reciprocating motion while supporting object weight. Therefore, load applied varies depending on the center of gravity of the object, thrust force applied position or changes in speed at start, stop, acceleration and deceleration. This calculator does not address dynamic forces.

Load Calculation.

This factor is also checked against Basic Static Load Rating: A load applied on non-moving Linear Bushings where a sum of rolling element plastic deformation amount and rolling surface plastic deformation amount becomes equal to 0.0001 times that of the diameter of the rolling element (balls).
Required Total Life (calculated) L km km required
Condition of Use i ⨍W

𝑖 Condition of Use / Load Factor

To calculate load applied to Linear Bushings, other than object weight, requires inertia force attributed to motion velocity or moment loads. However it is difficult to attain accurate calculations due to potential vibration and impacts caused during reciprocating motion, other than repeated start-stop motions. Here a load factor table is used to simplify the calculation.
< 15m/min ⨍W = 1.5
No impact/vibration. < 60m/min ⨍W = 2
Low impact. > 60m/min ⨍W = 3.5
Heavy impact/vibration.

Basic Dynamic Load Rating i

𝑖 Basic Dynamic Load Rating

C: Basic Dynamic Load Rating: A constant load applied in a constant direction and ran under equal condition on a group of Linear Bushing specimen where 90% of the specimen will reach 50km without eperiencing any damages due to rolling fatigues.

L: Required Total Life

⨍W: Condition of Use / Load Factor

P: Working Load

⨍H: Hardness Factor

⨍T: Temperature Factor

⨍C: Contact Factor - fixed at 2 points, ⨍C = 0.81

Basic Dynamic Load Rating Equation

Bearing Steel Load Rating (calculated) C N N required

58 HRC ⨍H = 0.95
Stainless Steel Load Rating (calculated) C N N required

56 HRC ⨍H = 0.90

4. Filters

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Size

Value

Form

Standard
Flanged

Maximum Diameter (mm) D

Pillow Block

Material

Value

Options

Value

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