Question
Download Solution PDFKnurling is an operation
Answer (Detailed Solution Below)
Detailed Solution
Download Solution PDFKnurling is the operation of producing straight lined, diamond-shaped pattern or cross lined pattern on a cylindrical external surface by pressing a tool called knurling tool. Knurling is not a cutting operation but it is a forming operation. Knurling is done at a slow spindle speed (1/3 the turning speed). However, speed & feed given for knurling is to be divided according to the job material and the finish required.
Purpose of knurling
- A good grip and make for positive handling
- Good appearance
- For raising the diameter to a small range for assembly to get a press fit
Knurling can be done in three grades. Coarse knurling, Medium knurling and Fine knurling
- Coarse knurling is done by using coarse pitched knurls of 1.75 mm pitch; (14 TPI)
- Medium knurling is done by using medium pitched knurls of 1.25 mm pitch; (21 TPI)
- Fine knurling is done by using finely pitched knurls of 0.75 mm pitch; (33 TPI)
Last updated on May 25, 2025
-> NMDC recruitment 2025 application form has been released at the official website.
-> The NMDC recruitment 2025 notification has been released for the Maintenance Assistant.
-> A total of 446 vacancies are announced for Maintenance Assistant recruitment.
-> Candidates can fill NMDC recruitment 2025 form till June 14.
-> The selection of the candidates depends on two stages, which are the Written Test and Trade Test.
-> The selected candidates for Maintenance Assistant will get an NMDC Maintenance Assistant Salary of Rs. 18,000 to Rs. 31,850.
-> Candidates appearing in the exam can refer to the NMDC Maintenance Assistant syllabus and exam pattern.