Shop Bench Machine Flashcards
Shear machines can be broken down into types by
Shear design
Drive systems
Power shear are electrically run with motors driving either a
hydraulic system or mechanical system
When cutting stainless steel the shear’s capacity is reduced
4 gauges
Varible rack machines require materials
1/2 or thicker
Direct drive shears motor turns off once the cut is made true or false
True
Mechanical shears are fast by design true or false
True
Once the mechanical shears activated it will not ?
Stop
Having a lower rack angle will give a better ?
Cut
What shear is more forgiving when the the pedal is released
Hydraulic
Air bending provides greater greater leverage with ?
Wider v-die and less pressure
What’s the top and bottom bending tool name
Top is the bunch
Bottom is die
Coining offers ?
Most accurate but requires highest amount of pressure
Bottom bending is used in high to low production and offers
Sharp corners and consistent accuracy
Air bending offers ?
Less accuracy and less tonnage
Disadvantage of air bending
Inconsistent of bends
Making a break above the tonnage chart is ?
Dangerous
Inside corner bend must add
20 percent
Outside corner bend must subtract
80 percent
Name two methods of forming methods
Coining
Air bending
Bottom bending
When forming inside dimensions, we must add
20%
When forming outside dimensions, we must subtract
80%
What is the most accurate way to determine bend allowance
Make trial bend
Name two methods of forming on a press break
Coining
air bending
How to compensate for springback
Overbend
What can be done to minimize irregularities caused by deflection?
Shimming should be done from the centreline outward
What day can be used to form unlimited number of shapes?
Rubber are you urethane rubber dies
List advantages of rubber dice
Will not scratch metal
Unlimited shapes
Fast set up
List the disadvantage of rubber dies
More tonnage
Rubber wears out faster
Cost of rubber dies
Coin is the most accurate but it’s disadvantage is
Distort the material
Less than half metal thickness will use how …….less tonnage
8 times out of
More then 1/2 metal thickness will use
10 times the tonnage
Name the guys used to eliminate marks and scuffing one forming
Rotator
Rollform dies
Can radius forming with roll forming roll dies
Yes
Press brakes are rated how
Psi
When sharing stainless steel, you must remember that stainless steel reduces the sheer by
4 gauges
Power shears are on made cut materials that exceed quarter an inch true or false
False yes they can
What dose the rack angle refer to
Shearing angle
