Calculating Linear Distance From Rotation

Shane

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Nov 28, 2012, 1:27:46 PM11/28/12

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I'm deferring to all the people who know better than I....

I need to calculate the distance that a piece will move downward in
relation to the rotation of a gear.

Think of a drill press....As you rotate the handle, the press moves
downward into the material.

How would I calculate the distance the press moves as a function of
rotation of the gear that drives the press down?

I suspect I could sit here and figure it out on my own, but my brain
is taking a day off.

I'm not entirely sure what to search for in Google, either. I keep
getting results that have to due with momentum and velocity, which are
negligible factors in this project.

Jerry [HM]

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Nov 28, 2012, 1:32:27 PM11/28/12

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Is it a 'gear' or a lead screw type of assembly?

(I know for lathes/mills that rated on the movement per turn/rotation)

Maybe start with the gear size/teeth/ratio.. and what it meshes with?
Start there for help/answers?

Or maybe do what my generic drill press does? Put a ruler along size the
'travel'.. and measure how much it moves (in distance) per tooth and per
rotation of the gear itself?

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Chris C

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Nov 28, 2012, 1:33:15 PM11/28/12

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I believe, and I could be wrong..

360 * ( [Distance to move] / (2*pi*R) ) = Angle to move circle

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Chris C

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Nov 28, 2012, 1:34:48 PM11/28/12

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this is of course assuming a circle, and not a gear (didnt compensate for teeth of a gear and how that affects it)

Have Blue

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Nov 28, 2012, 1:36:15 PM11/28/12

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If it's a gear, use the "pitch diameter".

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Vishal Rana

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Nov 28, 2012, 1:36:38 PM11/28/12

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(pi)x(diameter of gear) will give you linear distance traveled for a full rotation of a gear.

Divide that by the # of teeth to get distance moved per tooth of gear moved. This will give you the rough distance.

Vishal

-----Original Message-----
From: Shane <Imp...@hotmail.com>
Sender: milwaukee...@googlegroups.com
Date: Wed, 28 Nov 2012 10:27:46
To: milwaukeemakerspace<milwaukee...@googlegroups.com>
Reply-To: milwaukee...@googlegroups.com
Subject: [MakerSpace] Calculating Linear Distance From Rotation

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Shane

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Nov 28, 2012, 1:40:57 PM11/28/12

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Yep. Thank you all. I just found a link.

I don't think that the teeth of the gear will affect the distance
travelled.

The issue is that none of this has been constructed yet, so I can't
just use a ruler.

Pi*D=C. C=Linear distance travelled per one rotation of the gear. As
Vishal said, all I have to do is divide by the number of teeth...once
I figure out just how many teeth to give them.

David Buggs

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Nov 28, 2012, 1:55:50 PM11/28/12

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Why not move it 1 full rotation and measure the distance traveled?

Buggs

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Shane

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Nov 28, 2012, 2:08:55 PM11/28/12

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Because it doesn't exist yet. :D

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