Try to solve this problem !

Discussion in 'Off-Topic' started by Jonasxx, Nov 9, 2018.

  1. Jonasxx

    Thread Starter New Member

    Nov 5, 2018
    0
    0
    Drill used in the manufacture of the engine parts is designed to have seven speeds. The range of hole sizes anticipated is from 6mm to 25mm.
    You have been asked to determine the six spindle speeds (rev/min) given that the cutting speed is 20m/min.

    These spindle speeds are to be arranged in:
    a) arithmetic progression
    b) geometric progression

    Note: N=1000s/pi x D, N=spindle speed (rev/min), s=cutting speed (m/min), D=hole diameter (mm)
     
  2. ericgibbs

    Moderator

    Jan 29, 2010
    7,519
    1,517
    hi Jona,
    Welcome to AAC.
    Is this a College or Homework assignment, I see that you are a Student.?
    E
     
  3. wayneh

    Expert

    Sep 9, 2010
    16,003
    6,093
    I'd start by determining the minimum and maximum. Then you can fill in the other values based on the type of progression. You have everything you need, right?
     
  4. Jonasxx

    Thread Starter New Member

    Nov 5, 2018
    0
    0
    What i need to find first ?

    You are investigating the electrical testing circuits and find that, in an inductive circuit, the relationship between instantaneous current i (amps)
    and the time t (secs) is given by:

    i = 2.1(1-e-9t)
    You have been asked to determine the time taken for the current to rise from 1 to B amps.


    Thanks
     
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