Low Cost Automation Tutorial

#080 LCA for Transfer - Standard Component Selection Practices

Category : Hints on designing

July22, 2011

The previous LCA discussion (Vol.83) on non-circular gears and link mechanisms as an example, selecting of standardized component specification selection is explained.

The selection of standard components vary depending on the environments where the LCA are applied. The table below shows the examples for general manufacturing applications.

(1) Selection criteria based on LCA usage environments

Industry Classification	LCA Usage Environment	Standard LCA Component Selection Criteria
Semiconductor Mfg. Electronics Mfg. High Prec. Bearing Mfg. Pharmaceutical Mfg. etc.	Cleanroom	Non-rusting material, surface treated, does not generate wear particles, non-grease and maintenance free, high performance
Food Mfg. Printing Ind.	Semi-cleanroom	In accordance with above.
General Mfg.	Air conditioned general room	Good cost vs, performance

(2) Explanation on standard component selections by LCA functionality

The figure below is an example of motion control LCA. The table below explains the standard component selection.

[Fig.1] Example of an LCA mechanism with non-circular gears and a link using MISUMI FA Mechanical Standard Components

Functions

Location

Standard LCA
Component
Selection Criteria

Standard Component Selection Specification
(From: MISUMI FA Mechanical - Standard Components)

Transmission of force and torque.

Link
Link connections

Strength against moment force.
Prevent wear and seizure of pivot pins and bearings.

1.	Link: LNFB Material: S45C Surf. Treatment: Black oxide
2.	Pivot pin: HCDG Material: S45C, 40HR or more
3.	Oil-less bushing: LFZB (For Heavy load / Low speed)

Force vector change

Slider
fulcrum pin

Strength
(Stress considered)

4.	Fulcrum pin: CMSG (Larger dia. selected for strength)

Rotation

Link connections

Durability
(Wear, Seizure)

5.	Linear bushing: LHSS (Requires selection by given load)

Motion guide

Shaft

Rigidity, Durability

6.	Solid shaft: SFJ Material: SUJ2 Surf. treatment: Induction hardening (58HRC or more)

Guide supports

Shaft support

Cost vs.
performance

7.	Shaft support: SHA

(3) Other constraints

1. Overall size determined based on special constraints.
2. Not to overlook safety aspects such as cover and etc.



LNFB	HCDG	LFZB	CMSG



LHSS	SFJ	SHA

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