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functional gage

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rupeshpahwa

Automotive
Mar 17, 2010
9
Thanks pmarc & drawoh,you both are very much right, but i have my drawing in that shape so i want to have Gage for that,without having any engineering change,can any body suggest ,how it will look like.
 
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rupeshpahwa,

Ctopher is right. You should have continued the previous thread.

If you want to gauge this thing, then you really should use a profile tolerance on the hex. This will give you a well defined MMC state that you can test with a hexagonal, female GO gauge. Your NOGO gauge will be a fork, .3129" wide that must not fit over any of the three flats.

Your drawing controls width and angle separately. You can make a GO gauge fork to test each flat separately.

I figure that based on your positional tolerance of .010", and your across flats dimension of .315", you have a total angular tolerance of 3.6°. You should be able to figure out how to interpret a 120° comparator gauge. Accounting for the MMC state requires you to measure across flats with micrometer.

A well prepared drawing will save you all sorts of inspection time.

Critter.gif
JHG
 
Drawoh,

Thanks a lot for your reply, I have one idea in my mind,i donot know i am right in this case , i have to hold on datum feature b to inspect the width. so i can have a mmc cylinder & two flats to inspect the width.
 
 http://files.engineering.com/getfile.aspx?folder=101ad1fa-eb2e-4d40-8b0c-975c2488dd6e&file=hex_gage.jpg
rupeshpahwa,

Your inspection gauge, as shown, will not work. You have a larger diameter between your reference diameter and your flats gauge. The piece that measures across your flats may have to be attached separately through dowel pins.

Critter.gif
JHG
 
I am thinking to make the .38 at mmc & check the accross flats .315 with respect to that.

thanks

rupesh
 
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