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Knurling is an operation

Knurling is an operation Correct Answer of generally roughing the surface for hand grip

Knurling 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)

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Related Questions

Knurling can be performed by special attachments.
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