Question
Download Solution PDFTaper shank drills are held in drill machine by using -
This question was previously asked in
ISRO SAC Technician B Fitter 6 Nov 2016 Official Paper
Answer (Detailed Solution Below)
Option 2 : Sleeve
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ISRO Technician B: Fitter Full Test 1
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Detailed Solution
Download Solution PDFConcept:
- Usually, all the drilling tools have straight or tapered shanks.
- This shank must be held in a machine spindle when machining is to be carried out.
- To hold the drill in the spindle, proper drill heads are required.
- Some of the tool-holding devices commonly used in a drilling machine are:
- Sleeve
- Socket
- Drill chucks
Sleeve
- When the drill shank size is smaller than the spindle of the machine, then the device used to hold the small shank drill is called Sleeve.
- The drilling tool required to hold in the spindle is first fitted into the inner taper of the sleeve.
- Then the sleeve along with the tool is fitted into the machine spindle.
- This outer taper of the sleeve always matches the spindle taper.
- The availability of different types of sleeves facilitates the use of a drilling tool with any taper corresponding to a sleeve that fits in the spindle.
Socket
- The device used to hold the drill, when the tapered shank of the tool is larger than the spindle taper, is called a Socket.
- The generally used socket is shown in Figure. In which, the socket taper matches the spindle taper, and the inside taper of the socket matches the spindle taper.
Drill chuck
- For fixing and removing drills, the chucks are provided either with a pinion and key or a knurled ring.
- Drill chucks are held on the machine spindle by means of an arbor fitted on the drill chuck.
Last updated on May 28, 2025
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