- A Is 2 And B Is 1 1 (211.53 KiB) Viewed 19 times
170 + A 30 R5 R50+A 45+(A/2) © 25+(A/2) SECTION A-A 210 + A 0 75+(A/2 R60 +B 7.50 12.50 R60-B
A is 2 and B is 1
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A is 2 and B is 1
A is 2 and B is 1
The item shown below is to be machined out of aluminium stock. the roughing cuts, leaving 1.0 mm all around and the 8 mm diameter through holes can be assumed to be done previously. Remember, the path of the tool centre is what's required. Questions: 1. Draw a freehand sketch (do NOT use CAD or a ruler) of the object showing where the program zero” is defined and include any machining instructions that would be needed for the CNC machine operator. This has to include how the job would be held to the machine table for this finishing cut. Choose a tool type and size that you think is most suitable for the job and the instructions for the machine operator has to include the tool details. (25%) 2. Write an NC program fragment, using ONLY the codes shown below, to do just the finishing cut around the contour and the details of the shape drawn. Assume that the thickness is 20 mm. Show the tool path. (60%) 3. Note: A= last digit of your SID number; B = second last digit of your SID number 4. If this piece is to be modelled using a CAD/CAM system and a suitable postprocessor were made available, what would be the differences in the way you would create the machine program (G & M program) compared to manual programming? (15%) GOO - rapid travel G01 - linear move G02 - cw circular move G03 - ccw circular move MO3 - start spindle CCW M00 - stop program
170 + A 30 R5 R50+A 45+(A/2) © 25+(A/2) SECTION A-A 210 + A 0 75+(A/2 R60 +B 7.50 12.50 R60-B
The item shown below is to be machined out of aluminium stock. the roughing cuts, leaving 1.0 mm all around and the 8 mm diameter through holes can be assumed to be done previously. Remember, the path of the tool centre is what's required. Questions: 1. Draw a freehand sketch (do NOT use CAD or a ruler) of the object showing where the program zero” is defined and include any machining instructions that would be needed for the CNC machine operator. This has to include how the job would be held to the machine table for this finishing cut. Choose a tool type and size that you think is most suitable for the job and the instructions for the machine operator has to include the tool details. (25%) 2. Write an NC program fragment, using ONLY the codes shown below, to do just the finishing cut around the contour and the details of the shape drawn. Assume that the thickness is 20 mm. Show the tool path. (60%) 3. Note: A= last digit of your SID number; B = second last digit of your SID number 4. If this piece is to be modelled using a CAD/CAM system and a suitable postprocessor were made available, what would be the differences in the way you would create the machine program (G & M program) compared to manual programming? (15%) GOO - rapid travel G01 - linear move G02 - cw circular move G03 - ccw circular move MO3 - start spindle CCW M00 - stop program
170 + A 30 R5 R50+A 45+(A/2) © 25+(A/2) SECTION A-A 210 + A 0 75+(A/2 R60 +B 7.50 12.50 R60-B
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