Tool Height (Leaving Cert Engineering): Flashcards
📚Flashcards
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12 cards from this deck
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Practise the cards
12 cards from this deck
What is tool height?
What is tool height?
Vertical position of cutting tool relative to workpiece centre line
3 impacts of tool height
3 impacts of tool height
Cutting performance, tool life, finished workpiece quality
Tool on centre position
Tool on centre position
Tip aligns perfectly with workpiece centre line
Optimal tool position for turning
Optimal tool position for turning
On centre
Rake angle when tool below centre
Rake angle when tool below centre
Reduced (makes cutting less sharp, increases cutting forces)
Clearance angle when tool below centre
Clearance angle when tool below centre
Increases (weakens tool tip)
Facing problem with tool below centre
Facing problem with tool below centre
Dimple left on face, impossible to get flat finish
Rake angle when tool above centre
Rake angle when tool above centre
Increases (but tool tip loses proper contact with workpiece)
Clearance angle when tool above centre
Clearance angle when tool above centre
Reduced or eliminated
Main problems with tool above centre
Main problems with tool above centre
Massive friction, excessive heat, rapid tool wear
Why tool above centre must be avoided
Why tool above centre must be avoided
Causes dangerous conditions with friction and heat damage
Why correct tool height is essential
Why correct tool height is essential
Ensures rake and clearance angles work as designed