Morse taper

For manual tool change only the Morse taper according to ISO 296 is used (Fig. 1) on shop floors in some cases. The force and torque transfer is achieved via the frictional contact of a self-locking taper angle of 1 20. For higher loads there are models with a clamp thread or a cotter. This type of interface is used in drilling spindles and sleeves of tailstocks. 

DrUls are available with Morse-taper shanks which fit directly into the spindle without the need for a chuck. 

The size of Morse taper depends on the drill diameter, and the range is shown in Table 8.1. 

Where a cutting tool or chuck has a Morse taper smaller than that of the spindle, the difference is made up by using a sleeve. For example, a drill with a No. 1 Morse-taper shank to be fitted in a spindle with a No. 2 Morse taper would require a 1-2 sleeve, i.e. No. 1 Morse-taper bore and a No. 2 Morse taper outside. Sleeves are available from 1-2, 1-3, 2-3, 2-4 and so on over the complete range. 

The tailstock can be moved on its guideways along the length of the bed and locked in any position. The quill contains a Morse-taper bore to accommodate centres, chucks, drills and reamers and is graduated on its outer top surface for use when drilling to depth. It can be fed in or out by... 

Drilling is carried out on a lathe by holding the drill in a chuck or mounting it directly in the quiU of the tailstock, which contains a Morse taper for this purpose. As with all drilling operations, some guide is required to enable the drill to start central, and a centre drill. Fig. 9.26, is commonly used. 

Drills are available with Morse-taper shanks which fit directly into the spindle without the need for a chuck. The size of Morse taper depends on the drill diameter, and the range is shown in Table 8.1. 

Fig. 8.12. Machine reamers have a Morse-taper shank, although reamers below 12 mm diameter are available with parallel shanks. The diameter is constant along its length, and cutting takes place on the chamfer or bevel at the front, which is usually 45°. This chamfer can be reground using a cutter-grinding machine.

An index plate containing a number of circles of different-spaced holes is attached to the front of the head. The spring-loaded pin attached to the crank locates in the required hole circle. The head spindle has a central hole to accept a morse taper centre while the outside is threaded to take a three- or four-jaw chuck (Fig. 11.16). 

Small boring head in which morse taper shank is held by high strength anaerobic retainer... 

Morse taper arbor having mounting boss attached with high strength anaerobic retainer. 

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