Tutorial: How to make engine part 34
CYLINDER HEADS
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Step 1:
roll it back up to here again
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Step 2:
open a sketch on the right plane and draw a big circle
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Step 3:
continue the sketch
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Step 4:
use trim command and finish your sketch
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Step 5:
use cut revolve command
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Step 6:
open a sketch on the right plane again
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Step 7:
start to drawing
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Step 8:
finish your sketch
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Step 9:
use extrude command
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Step 10:
roll the line forward
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Step 11:
open a sketch on the shown face .
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Step 12:
draw two circles
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Step 13:
use cut extrude command
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Step 14:
open a sketch on this face at this time
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Step 15:
draw two 19mm radiused circles
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Step 16:
cut the body like shown
next: http://grabcad.com/questions/tutorial-how-to-make-engine-part-35