Use LEFT and RIGHT arrow keys to navigate between flashcards;
Use UP and DOWN arrow keys to flip the card;
H to show hint;
A reads text to speech;
24 Cards in this Set
- Front
- Back
|
What is milling? |
Shaping metal or plastic using a revolving multi tool cutter |
|
|
What is routing? |
Shaping wood using a revolving multi tool cutter |
|
|
What is CNC milling? where is it often used? |
Milling where each axis controlled by stepper motor using CNC code. often used in furniture industry |
|
|
What is a centre lathe? |
Machine where work is rotated towards a cutter which can be moved along x and y axis |
|
|
What are the 6 types of tool used in centre lathes? |
Roughing tools, knife tools, round nosed tools, parting tools and boring tools |
|
|
What is the difference between a centre lathe and a wood turning lathe? |
In a wood turning lathe tool is rested on a support and guided by hand |
|
|
What 3 tools can be used on a wood turning lathe? |
skew chisels, gauges, parting chisels and scrapers |
|
|
What is CNC turning? |
Where the movements of the work and tool are controlled by stepper motors run by CNC code |
|
|
What are the 4 general mechanical movements? |
rotating, linear, reciprocating and oscillating |
|
|
Describe a first class lever and give an example |
Fulcrum between load and effort. force multiplier so less effort needed than load e.g crowbar |
|
|
Describe a second class lever and give an example |
Load applied between effort and fulcrum and so effort needed is less than load as load nearer fulcrum e.g. wheelbarrow |
|
|
Describe a third class lever and give an example |
Effort applied between load and fulcrum. Effort needed is more but movement is multiplied. E.g elbow |
|
|
What is a crank? |
converts reciprocating to rotating motion or visa versa |
|
|
What is a CAM |
Converts rotary to reciprocating motion |
|
|
What are the two parts of a CAM |
Follower- Rod which moves up and down Guide- Holds follower in place |
|
|
What are the 4 types of spring? |
Resist extention Resist compression Resist radial movement Resist twisting |
|
|
What two things can linkages be used for? |
As levers of to convert types of movement |
|
|
Give three types of linkages |
Moving wings Push/ pull Tongs |
|
|
If a gear moves another with twice the number of teeth how fast will it move and with what force? |
Half the speed with twice the force |
|
|
what are three different types of gears? Describe the motion in each |
rack and pinion- circular to linear motion Worm and wheel- turns through 90 degrees and gives lots of torque Bevel- turns though 90 degrees |
|
|
What is good about a chain and sprocket? |
Direct drive so doesn't stretch or slip but can be difficult to remove |
|
|
What is good about a pulley? |
Twist in belt can make second pulley move in opposite direction and can stretch to absorb shock but belt can slip |
|
|
Draw a DPDT output |
photo |
|
|
Draw an LED |
photo |
