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Re: how to indicate slip fit between parts on drawings?
Re: how to indicate slip fit between parts on drawings? -- elenz	Post Reply	Top of thread	Forum

Posted by: sunnyputu12 ® 11/14/2006, 01:54:29 Author Profile eMail author Edit

I see that the range for your hole is 2.05 to 2.1 mm .So to have a transition fit i would prefer your pin dia to be 2.05 +0,-.05mm. Please note : 1. Tolerances depend on the type of fit you want ( loose , transition and interference) 2. If possible try to avoid unilateral tolerances ( like you have used ) and instead give a bi-lateral symmetrical tolerance .Because while tooling the part the manufacturer will convert the unilateral tolerances to bi-lateral

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Re: how to indicate slip fit between parts on drawings?
Re: how to indicate slip fit between parts on drawings? -- elenz	Post Reply	Top of thread	Forum

Posted by: Kelly_Bramble ® 01/07/2006, 17:20:03 Author Profile eMail author Edit

The following webpage has several suggested mechanical tolerance charts /tolerance_chart.htm. The submenu "Shaft and Hole Fits" /general_tolerances.htm delineates several types of fits for different hole / shafts.

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Re: how to indicate slip fit between parts on drawings?
Re: how to indicate slip fit between parts on drawings? -- elenz	Post Reply	Top of thread	Forum

Posted by: randykimball ® 01/06/2006, 23:02:21 Author Profile eMail author Edit

One good way is to an American National Standard Prefered Shaft Basis Metric Clearance Fit. To shorten this down you simply call out a G7 tolerance for the hole and a h6 tolerance for the shaft for 2.05 nominal sizes. The G7 and h6 will explain the rest to the machinest. These will provide a sliding fit. If you want a close running fit call out F8 and h7, (shaft and hole respectively) The G7 fit would be 2.062mm to 2.052mm, and the h6 fit would become 2.050mm to 2.044mm. These diameters need to be of a good RMS finish of near 32RMS or better at those sizes. Also note, if the shaft or the hole is not round enough you may get a press fit at some rotation position. (the "G" [the hole] is a capital and the "h" [the shaft] is not) For more details this information is published in the Machinery's Handbook under fits. Example: <-------------- 2.05mm G7 ---------------> These can be calculated from data provided in ANSI B4.2-1978. 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. Modified by randykimball at Sat, Jan 07, 2006, 00:00:57

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Re: how to indicate slip fit between parts on drawings?
Re: how to indicate slip fit between parts on drawings? -- elenz	Post Reply	Top of thread	Forum

Posted by: pwehmer ® 01/06/2006, 10:33:10 Author Profile eMail author Edit

0.05mm is a large tolerance for such a small hole. slip fit for a 2mm hole: Hole = 2 +0.01/-0 Shaft = 1.998 +0/-.006 This allows between .002 to .018 gap.

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