USING MILLING TECHNIQUES Flashcards
1
Q
Engineering info on a drawing (5)
A
- Dimensions
- Scale
- Tolerance
- Material
- Designers name
2
Q
Factors effecting speeds & feeds when milling (4)
A
- cutting fluid
- material
- Required surface finish
- Machine power
3
Q
Types of work holding equipment (4)
A
- Vice
- Direct clamp
- Rotary table
- Fixture
4
Q
Requirement for leaving milling machine (3)
A
- Remove work from holding device
- Remove swarf and clean down machine
- Return surplus material to store
5
Q
DTI plunger type gauge (2)
A
- Plunger range is 0-12 mm
* 1mm = 1 rev on dial
6
Q
Properties of high speed steel (3)
A
- Wear resistance
- hardness retention - even at red heat
- Toughness
7
Q
Applications for HSS (2)
A
- Drills, taps, saw blades
* Wood-turning
8
Q
Procedure for selecting a cutter (2)
A
- Select tool with correct diameter
* Check teeth are not damaged
9
Q
Checks when assembling a tool for milling a pocket (3)
A
- Choose a slot drill
- Check cutter and collet is in good condition
- The shank of the cutter and collet match
10
Q
Calculations for cutter RPM (1)
A
•N = 1000* V/ π*D
- V = surface speed (m/min)
- D = diameter (mm)
- N = speed in rpm
11
Q
Classes of fit (2)
A
- Clearance fit - the shaft is always smaller than the hole it needs to go into
- interference fit - the shaft is always bigger than the hole it needs to go into
12
Q
Types of milling cutter (2)
A
- Face mill - for creating a large flat area with a good surface finish
- End mill - for milling the end of a block, outsife profile, or cutting a thin slot or internal pocket
13
Q
Dividing head (1)
A
•W = R*H/D
- R = ratio
- H = number of holes
- D = number of divisions required
- W = whole number