DML Final Exam Set questions and solutions

weld - made when separate pieces of material to be joined combine and form one piece when heated to a temperature high enough to cause softening or melting benefits of welding - dependable, efficient, economic method for permanently combining materials how many axes of motion do the manual lathes have - 2 (x and z) what typically gets clamped into the lathe's chuck - the part you are working with what typically gets clamped into the tailstock - the drill bit list four lathe operations used to produce the assigned wheel hubs in class - facing, chamferring, turning, drilling list four lathe operations used to produce the assigned motor mounts in class - how much is the diameter of a workpiece reduced if the cutting tool is moved .1" towards the spindle's centerline and why (lathe) - .2", the .1" will be taken off radially three controllable cutting parameters for lathes - feed rate, cutting speed, depth of cut what type of manual milling machines do we have in the lab - knee and column mills (3 axes of motion) from what type of material are the milling cutters and drills used in the lab made - high speed steel (HSS) what is the limiting factor (not the .100" limit) for how deep you can cut per pass with an endmill in a particular material - machine stiffness, cutting tool stiffness, and/or workpiece stiffness what type of internal thread is better for softer materials? - COURSE threads are better becasue they have a smaller minor diameter, and consequently the cross section of the softer material is larger, making the material stronger T/F Bolt holes are always clearance holes - TRUE when should you use a CNC - complex geometry, mass production typical tolerance range for features machined on milling machines and lathes - +-.005" to +-.020" I.D. - inner diameter O.D. - outer diameter D.R.O - digital readout thou - thousandths of an inch 1 INCH - 25.4 MM 1 MM - .039 INCH 1 M - 3.28 FT 1 LB - 4.48 N 1 KG - 2.2 LB what are the two varieties of fasteners - coarse and fine how are threads on all quality fasteners made - they are made by rolling or sliding dies what is the sole purpose of fasteners - to clamp parts together what keeps a fastener tight or secure - a properly designed and torqued fastener joint are coarse or fine threads stronger - whichever thread has the larger minor diameter will be stronger which thread type is stronger in soft materials - higher pitch and smaller diameter T/F All standard tool holders are designed to cut with the cutting point located on the centerline of the spindle (or workpiece) - TRUE