By Bernard Hodges
A part of the "Computer-Aided Engineering" sequence, this workbook presents Computer-Aided Engineering Scheme 230 and similar BTEC classes. it may be used independently of the others and of the center textual content. CNC (computerized numerical keep watch over) structures are crucial parts in lots of commercial approaches. this article comprises 15 studying assignments, every one with a few conscientiously selected and established initiatives which may still boost the abilities had to paintings from engineering drawings of parts that are to be machined, and to supply half courses which include some of the instructions and features of a CNC approach. There also are life like work-based initiatives which collect quite a few facets lined within the workbook. All beneficial issues are incorporated from application making plans and writing, to modifying and proving.
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Extra info for CNC Part Programming Workbook
You can see from this example that using the macro facility reduces not only the programming time but also the length of the CNC part program. 1 using incremental programming. Then re-program using subroutines and macro programs. Produce a print-out of the CNC part program and the toolpaths. 2, using the macro method for machining the slots. 6. X 12 24 36 48 60 72 84 96 ~ 19. 1 is quite complex and for clarity's sake letters are used to designate certain points on the profile. Their X and Y co-ordinates are tabulated at the top left-hand corner of the drawing, thus avoiding a mass of dimension lines.
O. 3 Three horizontal parallel lines 50 mm apart, each 100 mm long. 4 A circle passing through three points with co-ordinates X20 Y20, X35 Y35, X65 Y35. S A circle of 35 mm radius and a second circle of 50 mm radius such that the second circle touches the first circle at 0°. 6 Two circles of 80 mm diameter, centres 250 mm apart, with a horizontal tangent line passing between them. 7 A 10 mm chamfer on a comer at 45°. 8 Two vertical lines 30 mm apart, each 80 mm long. Join them with a horizontal line.
3 • ::: ... ~ '\. 0 I HOLE 6 DIA 0 0 "' RIO 4 ALL DIMENSIONS IN HH _. Project P3 Project 3 HOLES 6 OIA SECTION ON A-A SPOTFACE 10 OIA X 5 DEEP Project 3 Cover plate with machined pocket and 'island' Hold the plate in a vice and drill the four 8 mm diameter holes. Bolt the workpiece in a fixture using the four holes for securing and location, and machine the pocket and profile. Drill and counterbore the four holes in the pocket. (Hint: When machining the pocket, use a pocket-milling cycle and machine 5 mm deep.
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