how to indicate slip fit between parts on drawings?
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Posted by: elenz ®

01/06/2006, 03:34:54

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hi, in some parts im designing, i have a hole dimensioned to 2.05 +0.05,-0 mm diameter.
A pin/cylinder would be inserted in the hole with a slip fit. how do i dimension the cylinder? its diameter is related to the holes.
thanks in advance






Modified by elenz at Fri, Jan 06, 2006, 04:00:08


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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

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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

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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 ®
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01/06/2006, 23:02:21

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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.





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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

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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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