- #1

Femme_physics

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That means that to find the RPM of the screw I do

pi x mean diameter of the screw x rotation per minutes / 60000

and I get the answer?

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- Thread starter Femme_physics
- Start date

- #1

Femme_physics

Gold Member

- 2,547

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That means that to find the RPM of the screw I do

pi x mean diameter of the screw x rotation per minutes / 60000

and I get the answer?

- #2

CWatters

Science Advisor

Homework Helper

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If the thread has a very coarse pitch the ball will move a long way for each revolution. If the thread has a very fine pitch it will move only a short distance for each revolution.

EDIT: I assume by "linear speed" you mean the speed along the threaded rod parallel to it's axis not the velocity around the rod? Perhaps I misunderstand what you mean?

- #3

Femme_physics

Gold Member

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I know the pitch (it's 4mm)

I just can't find the formula that relates it to rotational speed, taking the axial speed of the nut into consideration

- #4

vk6kro

Science Advisor

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So you can work out how many times it rotates for the nut to travel 300 mm.

This gives revs per second, so you can work out how many revs per minute that is.

- #5

Femme_physics

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4mm x RPS = 300mm

RPS = 75

RPM = 75 x 60 = 4500 [RPM]

Is that right?

RPS = 75

RPM = 75 x 60 = 4500 [RPM]

Is that right?

- #6

gneill

Mentor

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4mm x RPS = 300mm

RPS = 75

RPM = 75 x 60 = 4500 [RPM]

Is that right?

4500 RPM looks good.

- #7

Femme_physics

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Thank you all :-)

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