Generating Motion Moving a part adds no value (except in packaging)

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Presentation transcript:

Generating Motion Moving a part adds no value (except in packaging) Moving a tool adds no value unless work is done on part. So, we want to avoid moving parts or tools any more than necessary One metal machining batch factor: 95% of a parts time is spent moving or waiting, 5% of time is on tool, of which only 30% is spent cutting.

Linear translation is most common motion Linear Motion Linear translation is most common motion Linear movement can be caused by: Pneumatic or hydraulic cylinders Rotary motion converted to linear Vibratory systems Electric solenoids Linear electric motors Piezoelectric actuators

Pneumatic power very popular in industry Pneumatic Systems Pneumatic power very popular in industry High force, economical actuators Force is independent of stroke Non-flammable, compressible, storable medium Compact, low heat production actuators Pneumatics best suited to discrete motion (not proportional) Energy costs of pneumatics are very high ~$0.005 / cu.ft. / year 1” cylinder with 6” stroke once/sec=>$392/year

Pneumatic Systems Ideal Gas Law: PV=mRT Boyle’s Law: P1V1 = P2V2

Pneumatic System Layout

Air Preparation

Single-Acting Cylinder

Single-Acting Cylinder

Double-Acting Cylinder

Pneumatic Cylinder Mounting Off-axis loading must be prevented! Pivoting mounts can eliminate axial loading: Clevis mount Trunnion mount Universal joints Shaft may rotate unless antirotation model is used

Trunnion Mount

Pneumatic Twin Cylinder

Pneumatic Bellows

Pneumatic Bellows

Pneumatic Rotary Actuators

Pneumatic Rotary Actuators

Pneumatic Schematics

Pneumatic Schematics