Question
For a shaft designated as 40 H8/f7, calculate the tolerances.
Answers
Given: Shaft designation = 40 H8/f7
The shaft designation 40 H8/f 7 means that the basic size is 40 mm and the tolerance grade for
the hole is 8 ( i. e. I T 8) and for the shaft is 7 ( i. e. I T 7).
Since 40 mm lies in the diameter steps of 30 to 50 mm, therefore the geometric mean diameter,
D = Square root of (30 x 50) = 38.73 mm
We know that standard tolerance unit,
i = 0.45 x Cube root of (D) + 0.001 D
i = 0.45 × 3.38 + 0.03873 = 1.559 73 or 1.56 microns
i = 1.56 × 0.001 = 0.001 56 mm ...(1 micron = 0.001 mm)
The standard tolerance for the hole of grade 8 (IT8)
= 25 i = 25 × 0.001 56 = 0.039 mm
The standard tolerance for the shaft of grade 7 (IT7)
= 16 i = 16 × 0.001 56 = 0.025 mm   Your Comment




  • Contributors: *,
More mechanical engineering Questions..
What is the function of EGR value?
Explain the difference between rotational and irrotational flow?
what is unit power of a Turbine ?
What are the points in the stress strain curve for steel?
What is boundary layer thickness in free convection case ?
Give one example of metal classified as per structure as BCC, FCC, HCP and CCP.
Explain water hammer?
What is radiosity ?
Define pipe flow ?
Define the terms hydraulic similitude and dimensional analysis?
In convection heat trfer, if heat flux intensity is doubled then temperature difference between solid surface and fluid will ?
Mention two major differences between shaper and planer ?
What do you understand by timed cylinder lubrication?
How the analyses and calorific values of fuels can be reported?
What should be done to prevent a safety valve to stick to its seat ?
What do you mean by drill sleeve and a drill socket ?
What for water/steam is injected in combustion zones of a gas turbine ?
What is the purpose of Corliss valve in place of D’-slide valve in steam engine ?
Extreme pressure in the cutting zone
What is mechanism?


Search
Can you Answer!!
  • Q What can keep for up to 4 years if stored in a cool dark place
  • Q What is recursion in C
  • Q A family X went for a vacation. Unfortunately it rained for 13 days when they were there. But whenever it rained in the mornings, they had clear afternoons and vice versa. In all they enjoyed 11 mornings and 12 afternoons. How many days did they stay there totally?
  • Q What does the function get_magic_quotes_gpc() means?
  • Q Can storage locations be created automatically? how can they created automatically?
  • Q In ancient time the place was called Dakshin Kosala. The current name was popularized by the Marathas and used for the first time in an official document in 1795. Name the place/location?
  • Q Which one of the following Courts is responsible for the enforcement of FRs?
  • Q Explain about composite indexes?
  • Q How to change a 32 bit kernel to 64 bit kernel?
  • Q What is a data cable?
  • Q Name the chief minister who has constituted a steering committee to monitor and coordinate the states drug de-addiction and rehabilitation programme.