# Homework Help: Tolerance tables homework

1. Aug 16, 2006

### teng125

Determine, by using the attached tolerance tables,the deviations for 145H8/d9 .

for only 145H8 ,i know what i mean but 145H8/d9 what does it mean??

pls help
thanx

2. Aug 16, 2006

### Meson

I don't have the formal definition with me, but for quick reference here we go:

Capital letter refers to sockets or holes, while small letter refers to shafts. Remember this form: Socket/Shaft

3. Aug 16, 2006

### teng125

ok....but then for 145H8/d9 , do u mean the nominal=145 is the same for H8 and d9??

bacause normally i know how to solve 145H8 but for 145H8/d9 which there appears a /d9, what should i do with it??

4. Aug 16, 2006

### Meson

This is because

"Inner diameter of the socket (tube) = 145 unit = outer diameter of the shaft."

Hence, there is no point repeating 145 twice.

By the way, why are you posting machine design problem here in Advanced Physics forum?

5. Aug 16, 2006

### teng125

because i post on the other forum,and got little replies,so i try it out here