• 1. Please fill in the words. Low helix drills have a shorter (1) therefore the (2) is good. However the (3) is not sharp therefore (4) is high.

  A(1) Chip disposal, (2) Spiral length, (3) Cutting edge, (4) Cutting resistance. B(1) Spiral length, (2) Chip disposal, (3) Cutting edge, (4) Cutting resistance. C(1) Spiral length, (2) Cutting resistance, (3) Cutting edge, (4) Chip disposal.

• 2. As the flute length increases?

  AOverall hole accuracy and drill tool life are influenced. BChip disposal increases. CHole accuracy increases.

• 3. As the point angle of a drill decreases?

  AThe chip thickness increases leading to improved cutting resistance. BThere is no actual effect at all. CThe chip thickness also decreases leading to poor chip disposal.

• 4. Solid carbide drills are best used on what type of machines?

  ABench drilling machines. BNC machining centres. CGeneral lathes.

• 5. What is the result of increasing the web thickness of a drill?

  AOverall chip disposal increases. BThe overall drill rigidity reduces. CThe overall drill rigidity increases.

• 6. The back taper of a drill is to ensure:

  AThat the drill can effective dispose of the chips generated. BThat the drill does not rub with the inside of the drilled hole. CThat the coolant reaches the tip of the drip.

• 7. The flute width of a drill is the ratio between the flute and the land width, if the flute width is large then?

  AThis means that the drill offers high chip disposal. BThis means that the drill offers high rigidity. CThis means that the drill offers effective cooling of the cutting edge.

• 8. Web tinning of a drill is used for what purpose?

  ATo reduce the thrust force that acts upon the drills cutting edge. BTo reduce the cutting speed acting upon the cutting edge. CTo reduce the torque acting upon the drill.

• 9. When machining a deep hole, L/D over 10, what is the recommended process?

  ATo pre-drill a prep-hole to a depth of L/D of up to 1~3, then carry out the actual machining of the deep hole. BDo not machine a prep-hole, go straight ahead and open up the deep hole. CTo machine a pre-hole to L/D of 6 then open up the hole.

• 10. Margin width of a drill is for what purpose?

  ADesigned to guide the drill into the hole. The deeper the drill has to drill the narrower the width becomes. BDesigned to guide the drill into the hole, the deeper the drill has to drill the width is made wider. CDesigned to allow coolant to reach the cutting edge.
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