Drill sleeve is used when the taper shank of the drill is smaller than the machine spindle.
The lip clearance angle of twist drill for general purpose should be 8 Degree to 12 Degree.
Soluble oil are made from mineral oils with emulsifying material added to make for mixing with water. Soluble oil is diluted with water to form an emulsion. The water cools whilst the oil lubricates. The extent of dilution depends upon the type of operation.
A hacksaw blade is made of either low alloy steel (LA) or high speed steel (HSS), and is available in standard lengths of 250 mm and 300mm.