Question
Download Solution PDFAt particular drill diameter, if rpm is increased, the cutting speed
Answer (Detailed Solution Below)
Detailed Solution
Download Solution PDFExplanation:
Cutting speed:
- Cutting speed is the speed at which the cutting edge passes over the material while cutting, and is expressed in meters per minute.
- It is given by:
V = \(\frac{\pi~\times~D~\times~N}{1000}\)
Where, D = Diameter of drill (mm), N = rpm, V = Cutting speed in m/min
- At a particular drill diameter, if rpm is increased, the cutting speed increases.
- Cutting speed is also sometimes stated as surface speed or peripheral speed.
- The selection of the recommended cutting speed for drilling or turning etc. depends on the materials to be machined, and the tool material.
|
Materials being drilled for HSS |
Cutting speed (m/min) |
|
Aluminium |
70 - 100 |
|
Brass |
35 - 50 |
|
Bronze(phosphor) |
20 - 35 |
|
Cast iron (grey) |
25 - 40 |
|
Copper |
35 - 45 |
|
Steel (medium carbon/mild steel) |
20 - 30 |
|
Steel (alloy, high tensile) |
5 - 8 |
|
Thermosetting plastic (low speed due to abrasive properties) |
20 - 30 |
Last updated on May 28, 2025
-> ISRO Technician Fitter recruitment notification 2025 has been released
->Candidates can fill ISRO Fitter application form from June 2 to 16.
->A total of 20 vacancies are announced for ISRO recruitment 2025 for Fitter.
->Candidates must have passed SSLC/ SSC/ Matriculation and should have NTC/ITI/NAC in ->Fitter Trade Certificate from an NCVT recognized by the government to satisfy the ISRO Technician B Fitter Eligibility Criteria.