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: terminology
: terminology -- kmintexas	Post Reply	Top of thread	Engineering Forum

Posted by: jboggs ® 01/15/2010, 07:28:19 Author Profile eMail author Edit

Do you have access to a Machinery's Handbook? If not, get one. According to Machinery's: ANSI Standard "RC" is a Running or Sliding Clearance Fit. There are nine classes of RC fits. The book gives the exact hole/shaft tolerances for various size ranges. Basically it is a fit that locates a moving part while still allowing smooth motion along its axis with various allowances for lubrication.

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: : terminology
: : terminology -- jboggs	Post Reply	Top of thread	Engineering Forum

Posted by: kmintexas ® 01/15/2010, 09:14:41 Author Profile eMail author Edit

Boggs. Your right. There are actually three types of class fits. RC is one of them and has nine class's of fits. I guess in general purpose drafting you could use those class fits? Right. But I have found in the past that the use of the feature found in it's working environment sometimes needs special attention. Has this been true on your side?

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: : : terminology
: : : terminology -- kmintexas	Post Reply	Top of thread	Engineering Forum

Posted by: jboggs ® 01/15/2010, 10:02:29 Author Profile eMail author Edit

Not sure exactly what you mean, but over the years I have generally adopted a policy on drawings of machined parts that I specify what I want for the final condition (fits, hardness, etc.) rather than the methods. I leave it up to the professional machinists to know how to achieve it. I don't really care about the means, just the end.

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: : : : terminology -- jboggs	Post Reply	Top of thread	Engineering Forum

Posted by: kmintexas ® 01/15/2010, 11:00:16 Author Profile eMail author Edit

That's basically what I am talking about. I've been a tool maker for years even though I can still learn good methods form other machinist and tool makers that I specify on my prints. Thanks for your input. Have a great day.

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