What is the maximum allowed value of VB in mm for HSS tool used with cast steel work piece for rough machining?

Tool wear can be caused by: Thermal cracking: Cracks that appear perpendicular to the cutting edge. These cracks are caused by large, rapid temperature changes at the cutting edge. Plastic deformation: When the cutting tool material is softened. This occurs when the cutting temperature is too high for a certain grade. Edge buildup: An accumulation of heavily strained work material on the cutting edge. This leads to dimensional errors and inconsistent surface finish.    Some effects of tool wear include: Increased cutting forces Increased cutting temperatures Poor surface... Show more

Tool wear can be caused by:
Thermal cracking: Cracks that appear perpendicular to the cutting edge. These cracks are caused by large, rapid temperature changes at the cutting edge.
Plastic deformation: When the cutting tool material is softened. This occurs when the cutting temperature is too high for a certain grade.
Edge buildup: An accumulation of heavily strained work material on the cutting edge. This leads to dimensional errors and inconsistent surface finish. 
 

Some effects of tool wear include:
Increased cutting forces
Increased cutting temperatures
Poor surface finish
Decreased accuracy of finished part
May lead to tool breakage
Causes change in tool geometry 

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