Crack, or normal casting? |
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Crack, or normal casting? |
74ravenna |
Sep 24 2016, 10:04 AM
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#1
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Member Group: Members Posts: 471 Joined: 19-October 14 From: nh Member No.: 18,032 Region Association: North East States |
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veekry9 |
Sep 25 2016, 06:48 AM
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#2
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OldMember Group: Retired Members Posts: 3,068 Joined: 17-June 13 From: TO Member No.: 16,025 Region Association: Canada |
Not a crack,it's a 'shrink riser'.
The mold of the part is(was),a polished steel surface of <63rms finish,nearly mirror. As the molten metal cools and changes volume,it shrinks,creating stress risers,and ridges. A superficial blemish,and acceptable in it's application,which may appear as a crack,to the untrained eye. https://www.google.ca/webhp?sourceid=chrome...e+for+aluminium (IMG:style_emoticons/default/smile.gif) / |
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