Mechanical Engineering - Production Engineering - Discussion

Discussion Forum : Production Engineering - Section 2 (Q.No. 3)
In machining soft materials, a tool with negative relief angle is used.
Answer: Option
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24 comments Page 1 of 3.

Vinay said:   4 years ago
Relief angle never negative. It lie between 3-15 degree.

Small relief angles are essential when machining hard and strong materials, and they should be increased for the weaker and softer materials. A smaller angle should be used for interrupted cuts or heavy feeds, and a larger angle for semi-finish and finish cuts.

LIGHT YAGAMi said:   4 years ago
Rake angle will be POsitive as the workpiece is soft and RELIEF angle will negative means below ZERO ANGLE LINE (X-AXIS). Here, negative means sign convention not actual value.

Saddam said:   4 years ago
Relief angle can't be zero or negative, so here should be negative rake angle which is used for hard and brittle materials.

Salahuddin said:   4 years ago
This is the first time am hearing negative relief angle. I think it is a negative rake angle. And the negative rake angle is used when machining hard materials.

MUKESH YADAV said:   5 years ago
Relief angle couldt negative it lies 3 to 15 degree.

Lagertha said:   5 years ago
What in the world is a negative relief angle?

Does it mean the tool will interfere in to the workpiece? I don't think negative relief is possible. Also, if they are talking about rake angle then why would soft workpiece require negative rake? If it is a rake. Then please someone explains the concept of negative rake on soft materials.

Dew said:   6 years ago
Explain the concept of negative relief angle.

Bk uma said:   6 years ago
Relief angle is always positive.

Somu spartaa said:   6 years ago
The negative insert has an angle of 90° (0° clearance angle), while a positive insert has an angle of less than 90° (for example, 7° clearance angle).

Manish D.Patel said:   6 years ago
Relief Angle can not be negative. It is always positive in any condition to minimise rubbing between flank and work surface.

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