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surface finish requirement----Engine components Idea
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Posted by: ravindraspatil1

10/10/2006, 11:34:07

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Hello All,

I want to know is there any necessity to define surfce finish requirement for waher sitting face to avoid failures ??? Especially crankshaft / camshaft. Also can any one suggest me standard practices folllowed for the same








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Re: surface finish requirement----Engine components
Re: surface finish requirement----Engine components -- ravindraspatil1 Post Reply Top of thread Forum
Posted by: randykimball
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10/10/2006, 22:44:24

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Well, you don't want to allow any tears in the surface that can become stress cracks, so you need to establish a finish mininum, and some magnet flux/dye process to locate any surface fractures. Plus you want to call out a radius in all the inside corners for the same reason. AND, I'm sure you aren't talking about the journals... clearly they must be called to a fine finish as a bearing surface, right?




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Re: Re: surface finish requirement----Engine components
Re: Re: surface finish requirement----Engine components -- randykimball Post Reply Top of thread Forum
Posted by: ravindraspatil1

10/18/2006, 23:36:51

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Thanks for reply !!

I am talking abt the counter weight to crankshaft mounting bolt sitting area !! Could pl eplain whether Surface finish requiremnt are needed !!








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Re: Re: Re: surface finish requirement----Engine components
Re: Re: Re: surface finish requirement----Engine components -- ravindraspatil1 Post Reply Top of thread Forum
Posted by: Kelly Bramble

10/19/2006, 09:48:22

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Surface finish should always be defined or specified on your engineering drawing. Normally, a crankshaft is sand cast then has post machining operations performed on it to create the accurate bearing surfaces. It is not uncommon to see the non-critical surfaces of a crankshaft in the as-cast condition. The as cast surface finish created by sand casting ranges from 64 Ra best case and up.







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