Lathe Machine Accessories and Mechanisms

The threaded spindle allows accessories to be screwed directly onto it, ensuring they are true to the axis of the spindle.

The accessory is located on a tapered spindle, and a threaded locking ring, when tightened, firmly holds the accessory in the taper.

Cam locks use holes in a flange on the spindle that receive studs from the accessory, tightening which draws the accessory onto a taper.

<p>Accessories are bolted to a flange on the spindle using studs that protrude from the rear of the accessory.</p> Signup and view all the answers

<p>Power should be turned off, and the spindle and accessory mating parts should be cleaned to avoid damage and ensure accurate location.</p> Signup and view all the answers

<p>Using power can jam the accessory and damage the threads, affecting accuracy.</p> Signup and view all the answers

<p>The fit of the external thread on the spindle holds the accessory true to the spindle's axis.</p> Signup and view all the answers

<p>A 'C' type spanner is commonly used to tighten and loosen the locking ring.</p> Signup and view all the answers

<p>It supports the accessory during fitting and protects the lathe bed from damage.</p> Signup and view all the answers

<p>The drive plate rotates the work set up between centres but does not support it.</p> Signup and view all the answers

<p>A face plate is used when work cannot be held between centres or in a chuck.</p> Signup and view all the answers

<p>The three jaw chuck grips work simultaneously, while the four jaw chuck allows for independent jaw movement.</p> Signup and view all the answers

<p>The jaws must be fitted in the correct order as marked on them.</p> Signup and view all the answers

<p>Power to the lathe should be switched off.</p> Signup and view all the answers

<p>Chucks can hold work of various sizes and shapes using adjustable jaws.</p> Signup and view all the answers

<p>Using chucks improperly can distort them when gripping irregular work or taking heavy cuts.</p> Signup and view all the answers

<p>The correct order is to release jaw number 3 first, followed by jaw number 2, and then jaw number 1.</p> Signup and view all the answers

<p>It's important to ensure that the jaws and chuck are a matched set for proper concentricity.</p> Signup and view all the answers

<p>The internal scroll should be lightly oiled to facilitate smooth operation, while avoiding excess oil.</p> Signup and view all the answers

<p>The jaws should be engaged in the sequence of 1, 2, and then 3, ensuring proper alignment.</p> Signup and view all the answers

<p>The jaws should be adjusted as necessary until they are all concentric with the chuck body.</p> Signup and view all the answers

<p>It allows for the independent movement of each jaw, enabling it to hold regular and irregular shaped workpieces.</p> Signup and view all the answers

<p>The chuck key should be removed from the chuck after confirming that all jaws are properly engaged.</p> Signup and view all the answers

<p>The jaws may not function correctly, leading to a loss of the self-centering feature and potential workpiece instability.</p> Signup and view all the answers

<p>Thoroughly clean the centre, sleeve, and bore of the headstock spindle.</p> Signup and view all the answers

<p>The centre should project about one and a half times the length of the point from the sleeve.</p> Signup and view all the answers

<p>Remove and check the inside of the sleeve and spindle for damage, clean, and reassemble.</p> Signup and view all the answers

<p>Oil prevents the centre from holding properly in the taper.</p> Signup and view all the answers

<p>Use a corner of a smooth file to check if the centre is soft enough to machine.</p> Signup and view all the answers

<p>Set the compound rest to 30 degrees to the lathe centre line.</p> Signup and view all the answers

<p>Use a smooth file to remove the sharp point.</p> Signup and view all the answers

<p>Knock it out using a bar with a soft end placed in the rear end of the headstock spindle.</p> Signup and view all the answers

<p>The lathe carrier drives the work to be turned between centres by clamping onto it.</p> Signup and view all the answers

<p>The carrier should be proportional to the work, fitting clearly over it without causing imbalance.</p> Signup and view all the answers

<p>The clamping screw must be tightened firmly, possibly using a scrap piece of metal to protect the finished surface.</p> Signup and view all the answers

<p>Plain centres are hardened and do not rotate with the work, while live centres run on bearings and rotate with it.</p> Signup and view all the answers

<p>Live centres do not require lubrication between the centre and the work.</p> Signup and view all the answers

<p>A small flat is filed to provide a positive drive for the clamping screw, ensuring a secure fit.</p> Signup and view all the answers

<p>Pipe centres are used to support work with a large bore and can have cones attached for better fit.</p> Signup and view all the answers

<p>Excessive pressure can cause the bearings within the live centre to overheat and become damaged.</p> Signup and view all the answers

<p>It prevents long slender work from springing away from the cutting tool.</p> Signup and view all the answers

<p>One pad is situated behind the work and the other on top, positioned 90 degrees apart.</p> Signup and view all the answers

<p>It indicates that the pads were not adjusted close enough to the work.</p> Signup and view all the answers

<p>The fixed steady supports long slender work held between centres or one end of long work in a chuck.</p> Signup and view all the answers

<p>Each pad is adjusted by means of a screw thread and can be locked in position.</p> Signup and view all the answers

<p>The pads should be adjusted to lightly touch the trued surface of the work.</p> Signup and view all the answers

<p>The fixed steady is bolted directly onto the top of the lathe bed.</p> Signup and view all the answers

<p>The surface between the work and the pads should be lubricated continually.</p> Signup and view all the answers