ME 440

Fall 2012

Project 2

The following data are taken from Omega.com (http://www.omega.com/ppt/pptsc.asp?ref=RPM_Series&ttID=RPM_Series&Nav=).

Design a similar gripper that uses an electric motor instead with the following specifications:

· 4.8 mm stroke

· Grip force 10N

· Use power screw to improve precision. A suggested design is shown below.

· You may want to choose the motor from Pololu http://www.pololu.com/catalog/category/22

· Design moving part to have infinite life using fatigue strength criteria

Note: You may need to disassemble a valve to better understand its workings. A typical valve used for irrigation or plumbing has many similar components.

Parallel Pneumatic Grippers Miniature Series

RPM Series - Mini Parallel 2-Jaw Gripper   

Miniature Parallel Grippers

^$ 347.00  RPM-1M

•	Pneumatic Parallel Mini Gripper Available in 3 Stroke Lengths
•	Precision Gripper-Preloaded V Roller Bearings Eliminate Side Play Resulting in Excellent Part Positioning
•	Gripper Accuracy of 0.05 mm (0.002") and Repeatability of 0.03 mm (0.001")
•	Rated Grip Force @ 7 Bar (100 psi), 36 N (8 lbs)
•	Compact Design for Gripping Small Parts in Small Places
•	Rigid and Low Friction Design Allows for Longer Finger Lengths for Use on Delicate Parts
•	Group Multiple Grippers in Close Array Using Top Manifold Mounting Surface
•	Up to 5 Million Cycles in Typical Operation and 10 Million with Maintenance
•	Operating Temperature -35 to 80°C (-30 to 180°F)
•	System Requires 3 to 7 bar (40 to 100 psi) Dry Filtered (40 micron or Better) Air Supply
•	Requires 4-Way, 2 Position Valve and Regulator for Delicate Parts

RPM Series Gripper is a miniature pneumatic parallel gripper with excellent parallelism and accuracy between the gripper mounting surface and jaw surface. Jaws are front mounted and are supported with 'Dual-V" roller bearings to provide low friction motion and are preloaded for maximum support and zero side play. RPM Pneumatic Grippers are top mounted and have air ports on the side or top for manifold mounting to keep the air line away from the gripper area. These grippers are available in stroke lengths from 3.2 to 6.3mm (0.13 to 0.25") with a gripper force of 36 N (8 lbs). Pneumatic linear motion pneumatic components are double acting air cylinders that require a dry air supply with filtering to 40 microns or better. For best control of pneumatic components, flow control valves (regulating out) should be installed to regulate the speed of the device. To learn more about pneumatic valves, view the Technical Reference Article Technical Principles of Valves To learn more about pneumatic grippers, view the Technical Reference Article "Introduction to Grippers" SPECIFICATIONS Pneumatic Specifications Pressure Operating Range: 3 to 7 bar (40 to 100 psi) Cylinder Type: Double acting Dynamic Seals: Internally lubricated Buna-N Valve Required to Operate: 4-way, 2-position Air Quality Requirements Air Filtration: 40 micron or better Air Lubrication: Not necessary* Air Humidity: Low moisture content (dry) Temperature Operating Range Buna-N Seals (Standard): -35 to 80°C (-30 to 180°F) Viton® Seals (Optional): -30 to 120°C (-20 to 250°F) Maintenance Specifications* Expected Life: Normal Application: 5 million cycles With Preventative Maintenance: 10+ million cycles* Field Repairable: Yes Seal Repair Kits Available: Yes *Addition of lubrication will greatly increase service life.

Part Number	Availability	Price	Description
RPM-1M		$347.00	Mini Parallel Pneumatic Gripper with 3.2 mm (0.13") Stroke
RPM-2M		$352.00	Mini Parallel Pneumatic Gripper with 4.8 mm (0.19") Stroke
RPM-3M		$357.00	Mini Parallel Pneumatic Gripper with 6.3 mm (0.25") Stroke
Accessories
SLKT-121		$16.00	Standard seal repair kit
SLKT-142V		$27.00	Top air port manifold seal kit (Viton® only)
OM-AIR-M22270403		$9.00	Mini-swivel elbow air fitting, 3M thread and 4mm tubing barb