DML Final Exam guide questions and answers

Lathe Turning Which term best matches the following definition? "A metal cutting process used for the generation of cylindrical surfaces. Normally the workpiece is rotated on a spindle and the tool is fed into it radially, axially, or both ways simultaneously, to produce the desired surface. The term, in the general sense, refers to the generation of any cylindrical surface with a single point tool." Profiling In a "______" operation, both modes of tool feed are simultaneously desired to created tapered and contoured surfaces. Boring A single point tool is fed linearly and parallel to the axis of a workpiece to enlarge a hole made by a previous process in the operation known as "_______." Chamfering For a "_____" operation, a tool cuts the corner of a cylinder at an angle. Drilling In the "_______" process, a hole is produced by feeding a drill into a rotating workpiece along its axis. Facing Surfaces are typically positioned perpendicular to the axis of the workpiece in the "______" operation. This operation is dominated by radial feed. Turning The generation of any cylindrical surface with a single point tool is referred to as "______." In this operation, the direction of the feeding motion is predominantly axial with respect to the machine spindle. Parting For a "______" operation, the end of a part is cut off by feeding a tool radially into a rotating workpiece at a particular location along its length. Threading During a "______" operation, external or internal threads are achieved by feeding a pointed tool linearly across the outside or inside surface of a rotating part. Knurling In an operation known as "________," a regular cross-hatched pattern is produced in work surfaces through metal forming. "Held in a collet" "held between centers" "Held in a Chuck" A variety of work holding methods may be used for machining on a lathe. When a workpiece is __________ , it is clamped in a rotary chuck containing 3 or 4 jaws for security. When a workpiece is ____________ , it is held in precision cylindrical bushings. When a workpiece is _________, it is supported between 2 pointed mandrels. This last work holding method is most often used for long, slender workpieces.___________ T True or False: All standard tool holders are designed to cut with the cutting edge or point located on the centerline of the machine and workpiece. 1. Headstock 2. Spindle 3. Ways 4. Tool post 5. Cross slide 6. Carriage 7. Bed 8. Tailstock The red boxed numbers on the included engine lathe illustration refer to specific components of the lathe as indicated by the arrows. Each number is to be matched with the name of its corresponding component. Turret Lathe - This lathe type represents the first step toward high production turning machines. - This lathe type replaces the tailstock and tool post compound assembly with tool-holding turrets. - This machine includes the "skill of the worker" within itself, so inexperienced operators can reproduce identical parts. - This machine type is more ideal for higher production needs. Engine Lathe - This machine requires a skilled operator and requires more time to produce identical parts. - This machine requires a skilled operator and requires more time to produce identical parts. Milling A process of generating machined surfaced by progressively removing a predetermined amount of material or stock from the workpiece which is advanced at a relatively slow rate of movement or feed to a milling cutter rotating at a comparatively high speed. End Milling