surface finish requirement----Engine components
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Posted by: ravindraspatil1 ® 10/10/2006, 11:34:07 Author Profile eMail author Edit

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 ® 10/10/2006, 22:44:24 Author Profile eMail author Edit

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? The worst suggestion of your lifetime may be the catalyst to the grandest idea of the century, never let suggestions go unsaid nor fail to listen to them.

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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 Author Profile eMail author Edit

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 -- ravindraspatil1	Post Reply	Top of thread	Forum

Posted by: Kelly Bramble ® 10/19/2006, 09:48:22 Author Profile eMail author Edit

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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