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# How would you solve this? watch

1. Hey Guys, Using my bros account right now so bare with me...

I have this question to solve but am unsure on how to tackle it? Can you help?

A Pillar drill has four spindle speeds arranged in AP (Arithmetic Progression) Holes are drilled between 5mm - 14mm in diameter. The drill has a cutting speed of 20m/min, find the spindle speeds.

I understand that the equation is V / Pi / D x 1000 to find the speed, but I cannot for the life of me remember how to find the missing diameters?

2. Anybody??
3. (Original post by Ryanx623)
Anybody??
people are still sleeping as it is half term
4. (Original post by Ryanx623)
Hey Guys, Using my bros account right now so bare with me...

I have this question to solve but am unsure on how to tackle it? Can you help?

A Pillar drill has four spindle speeds arranged in AP (Arithmetic Progression) Holes are drilled between 5mm - 14mm in diameter. The drill has a cutting speed of 20m/min, find the spindle speeds.

I understand that the equation is V / Pi / D x 1000 to find the speed, but I cannot for the life of me remember how to find the missing diameters?

From what I understand of the question, the speeds form an arithmetic sequence of four values and the cutting speed is the same for each end so they have different diameters. If you work out these spindle speeds you can substitute into the equation you've been given to work out the diameters.
5. (Original post by morgan8002)
From what I understand of the question, the speeds form an arithmetic sequence of four values and the cutting speed is the same for each end so they have different diameters. If you work out these spindle speeds you can substitute into the equation you've been given to work out the diameters.
Okay so could you bullet point the steps I need to make for me?
6. (Original post by Ryanx623)
Okay so could you bullet point the steps I need to make for me?
No. We're not supposed to give full solutions.
Do you know how to do the first bit? Finding the values of the spindle speeds.
7. (Original post by morgan8002)
No. We're not supposed to give full solutions.
Do you know how to do the first bit? Finding the values of the spindle speeds.
Not really, I didn't want it done for me, I just need to know the order in which to do things

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