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Machining Face Surfaces -- Question
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Posted by: Angi ®

04/04/2005, 16:25:27
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Question -- I have a spec requiring machined surface finish of 3.2um max on one item; and 12.5um max on another. Can someone please tell me how this converts to uin? Normally we just state '125rms' or '500rms' surface machining.

Thanks,
Angi







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Re: Machining Face Surfaces -- Smile
Re: Machining Face Surfaces -- -- Angi Post Reply Top of thread Forum
Posted by: bjhughes ®

04/05/2005, 12:05:28
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Angi,

1 um = 1/40 uin

Therefore, 3.12 um = 125 uin, and 12.5 um = 500 uin.

Hope this helps.







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Re: Machining Face Surfaces -- Question
Re: Re: Machining Face Surfaces -- -- bjhughes Post Reply Top of thread Forum
Posted by: Angi ®

04/05/2005, 12:20:37
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Thank you for your reply. It was very helpful.

Can you also please tell me the definition of 'uin' and 'um'. I'm assuming uin is units in inches or something like that and um refers to metric units. I am trying to pass along this knowledge to my production department and don't want to stear them the wrong direction.

Again, thanks so very much for your help.







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Re: Machining Face Surfaces -- Question
Re: Re: Machining Face Surfaces -- -- bjhughes Post Reply Top of thread Forum
Posted by: Angi ®

04/05/2005, 12:20:14
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Thank you for your reply. It was very helpful.

Can you also please tell me the definition of 'uin' and 'um'. I'm assuming uin is units in inches or something like that and um refers to metric units. I am trying to pass along this knowledge to my production department and don't want to stear them the wrong direction.

Again, thanks so very much for your help.







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Re: Machining Face Surfaces -- Smile
Re: Re: Machining Face Surfaces -- -- Angi Post Reply Top of thread Forum
Posted by: bjhughes ®

04/05/2005, 12:55:10
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Angi,

um = micro-meters (10E-6)

uin = micro-inches (10E-6)

The "u" should actually be the greek letter "mew", which is standard engineering symbol for "micro" (10E-6).

Good luck. Take Care.







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Re: Machining Face Surfaces -- Smile
Re: Re: Machining Face Surfaces -- -- bjhughes Post Reply Top of thread Forum
Posted by: Angi ®

04/05/2005, 13:44:12
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Thank you! You have been very helpful.

Angi







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