L10: Hand Tools

Question 1

What is RMI & CTD

Answer 1

Repetitive Motion Injury

Cumulative Trauma Disorder (can be come permanent disability)

Question 2

What are the basic causes of RMI

Answer 2

Excessive force
Awkward or extreme joint motions
High repetition
Duration of Work

Question 3

Describe Cubital Tunnel Syndrome

Answer 3

Compression of Ulnar nerve in elbow
Tingling and numbness
Caused by resting elbow on hard surface or sharp edge

Question 4

Describe Tendinitis

Answer 4

Inflammation of a tendon
Symptoms are pain, burning sensation, swelling
One special case is shoulder tendinitis or bursitis at the rotator cuff

Question 5

Describe Tenosynovitis

Answer 5

Special case of De Quervain’s Disease occur due to forceful gripping and twisting of a hand, using a screw driver

Question 6

Guidelines for hand posture

Answer 6

Avoid 90* wrist rotation
Keep finger pinches less than 10N
Keep forces low during rotation or flexion of wrist

Question 7

Guidelines for handtools

Answer 7

Cylindrical grips should not exceed 5cm
Avoid gripping that spreads the fingers more than 6cm
Use hand tools that make it possible to maintain neutral position

Question 8

Guidelines for workstation design

Answer 8

Keep the work surface low to permit the operator to work with elbows to the side and wrists in a neutral position

Question 9

Guidelines for Process Engineering

Answer 9

Allow machinery to do repetitive tasks and leave variable tasks to human operators
Provide jigs to support workload
Allow works to work on their own pace

Question 10

Guidelines for Product Design

Answer 10

Minimize # of loose parts like screws
Minimize force required for screws
Design product with large parts to permit gripping with fingers.

Question 11

3 requirements of a tool?

Answer 11

Fit the task
Fit the user and hand
Not create injuries