helo to decide tolerance
 

helo to decide tolerance
hi all,
i need a little help to determine a tolerance.
i have to design a bracket to fit to a vehicle using two pins. the two holes on the vehicle are at 1000+/-5mm centres. the holes are each 50+/-1mm diameter.
if i make the holes in my bracket the same diameter, what tolerance should i use on the holes centres to ensure the bracket always fits? it is not possible to use slots or adjust the centre distance on site. if i use 1000+/-5mm then their could be a nominal 10mm error.
thanks
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hi max44
what size are your pins and what tolerance, not sure that with such a wide tolerance of +/- 5mm you can get what you want.
desertfox
hi desertfox,
pin dimensions not yet determined but need to be a nice running fit. i also think that i cannot get a perfect solution but thought i would see if i can get some 'best practise' replies.
thanks
hi max44
not sure how your going to get a nice running fit with +/- 1mm on hole diameters.
to get a useful answer we need all the information (if a useful answer is possible in your case.
with the tolerances your quoting the pins would have to be a large clearence fit at present.
desertfox
the spreadsheet in my 4 sep 08 3:26 post on