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  1. Nels

    Nels United States Founder Staff Member H-M Supporter-Premium

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    http://web.mit.edu/2.670/www/Tutorials/Machining/lathe/Description.html

    Lathe
    Labeled Photograph
    Description
    Choosing a Cutting Tool
    Installing a Cutting Tool
    Positioning the Tool
    Feed, Speed, and Depth of Cut
    Turning
    Facing
    Parting
    Drilling
    Boring
    Single Point Thread Turning
    Advanced Work Holding

    [paste:font size="5"](click here for video) 2.11MB
    The tool post is secured to the compound with a T-bolt. The tool holder is secured to the tool post using a quick release lever. (click here for video) 1.99MB



    [paste:font size="5"](click here for video) 860kB

    There are also power feeds for these axes. Procedures vary from machine to machine.

    A third axis of motion is provided by the compound. The angle of the compound can be adjusted to allow tapers to be cut at any desired angle. First, loosen the bolts securing the compound to the saddle. Then rotate the compound to the desired angle referencing the dial indicator at the base of the compound. Retighten the bolts. Now the tool can be hand fed along the desired angle. No power feed is available for the compound. If a fine finish is required, use both hands to achieve a smoother feed rate. (click here for video) 2.05MB

    The cross slide and compound have a micrometer dial to allow accurate positioning, but the saddle doesn't. To position the saddle accurately, you may use a dial indicator mounted to the saddle. The dial indicator presses against a stop (often a micrometer as shown in the clip below). (click here for video) 1.29MB

    [paste:font size="5"]clamp the part securely in a lathe chuck (636kB). The part should not extend more that three times its diameter. Then install a roughing or finishing tool (whichever is appropriate). If you're feeding the saddle toward the headstock (as in the clip below) use a right-hand turning tool. Move the tool off the part by backing the carriage up with the carriage handwheel, then use the cross feed to set the desired depth of cut. In the clip below, a finish cut is made using the power feed for a smoother finish. Remember that for each thousandth depth of cut, the work diameter is reduced by two thousandths. (click here for video) 821kB
    [paste:font size="5"]clamp the part securely in a lathe chuck (636kB). Then, install a facing tool. Bring the tool approximately into position, but slightly off of the part. Always turn the spindle by hand (248kB) before turning it on. This ensures that no parts interfere with the rotation of the spindle. Move the tool outside the part and adjust the saddle to take the desired depth of cut. Then, feed the tool across the face with the cross slide. The following clip shows a roughing cut being made; about 50 thousandths are being removed in one pass.(click here for video) 2.35MB If a finer finish is required, take just a few thousandths on the final cut and use the power feed. Be careful clearing the ribbon-like chips; They are very sharp. Do not clear the chips while the spindle is turning. After facing, there is a very sharp edge on the part. Break the edge (205kB) with a file.
    [paste:font size="5"](click here for video) 2.45MB When the cut is deep, the side of the part can rub against sides of the groove, so it's especially important to apply cutting fluid. In this clip, a part is cut off from a piece of stock. (click here for video) 246kB
    [paste:font size="5"](click here for video) 1.93MB
    Move the saddle forward to make room for the tailstock. Move the tailstock into position, and lock the it in place (otherwise it will slide backward as you try to drill). Before starting the machine, turn the spindle by hand. You've just moved the saddle forward, so it could interfere with the rotation of the lathe chuck. Always use a centerdrill to start the hole. (click here for video) (2.30MB). You should use cutting fluid with the centerdrill. It has shallow flutes (for added stiffness) and doesn't cut as easily as a drill bit. Always drill past the beginning of the taper to create a funnel to guide the bit in. (click for computer generated animation of funnel effect, not yet available). In this clip, a hole is drilled with a drill bit. (click here for video) 1.07MB Take at most one or two drill diameters of material before backing off, clearing the chips, and applying cutting fluid. If the drill bit squeeks, aplly solvent more often. The drill chuck can be removed from the tail stock by drawing back the drill chuck as far as it will easily go, then about a quarter turn more. A pin will press the chuck out of the collet. (click here for video) 554kB

    [paste:font size="5"](click here for video) 554kB
    If the part has a very large hole through it, a lathe arbor may not be a practicable solution. You may instead use the outside of the jaws to hold the inside diameter of the part. (click here for video) 983kB

    If the part has a very complex geometry, it may be neccesary to install the part onto a face plate. The face plate is then attached to the spindle. (click here for video) 452kB


    On to the belt sander.
    Return to the machine shop.
    Return to the Mechanical Engineering Department.

    Maintained by 2.670adm@mit.edu
     
    Last edited: Jan 21, 2017

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