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Unread 10-02-2017, 15:45
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JVN tabs question

What is the difference between the "intake mechanism" tab and the "linear mechanism" tab. I get the same travel times but the current draw is a LOT LOWER on the linear tab.
I am trying to use it for our winch.
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Unread 10-02-2017, 15:59
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Re: JVN tabs question

To calculate a winch, you would use the Linear Mechanism tab. The Intake Mechanism tab is for calculating intakes used to pick up spherical objects from the floor.
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Unread 10-02-2017, 16:11
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Re: JVN tabs question

THANKS It will go a lot faster now
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Re: JVN tabs question

I don't completely understand. Why would the intake calcs show a much higher amp draw?
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Re: JVN tabs question

Drag load =/ Applied load
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Re: JVN tabs question

Quote:
Originally Posted by EricLeifermann View Post
Drag load =/ Applied load
ok no big math guy here I read your post as Drag load equals divided by Applied load. You really lost me there.
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Re: JVN tabs question

Quote:
Originally Posted by Bruceb View Post
What is the difference between the "intake mechanism" tab and the "linear mechanism" tab. I get the same travel times but the current draw is a LOT LOWER on the linear tab.
I am trying to use it for our winch.
Linear mechanism tab is the way to go. Note that you have to account for any increase in pulley diameter (due to rope wrapping increasing the effective diameter of the pulley) manually when setting up the calculations.

You can also use the rotary mechanism tab but then you have to calculate the number of rotations required to climb.
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Re: JVN tabs question

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Originally Posted by Bruceb View Post
ok no big math guy here I read your post as Drag load equals divided by Applied load. You really lost me there.
Drag load is not the same as applied load, that is why your seeing an amperage difference.
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Re: JVN tabs question

I think Eric meant the not-equal-to symbol, =/= he just forgot that second =.
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Re: JVN tabs question

Quote:
Originally Posted by EricLeifermann View Post
Drag load is not the same as applied load, that is why your seeing an amperage difference.
ok please explain the difference
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Re: JVN tabs question

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Originally Posted by cbale2000 View Post
Linear mechanism tab is the way to go. Note that you have to account for any increase in pulley diameter (due to rope wrapping increasing the effective diameter of the pulley) manually when setting up the calculations.

You can also use the rotary mechanism tab but then you have to calculate the number of rotations required to climb.
Yes. The linear and rotary tabs produce the same current draw. The intake tab shows a much higher current draw. I guess that is what I am having a difficult time digesting. Can someone explain this to me please? Examples of each would be nice. Thanks
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Re: JVN tabs question

The intake tab is for calculations for a conveyor sliding/rolling a game piece and the linear motion tab is for a winch moving a linear mechanism.

The linear tab uses load applied directly to the winch and the intake tab uses drag load of the game piece. It doubles the drag load number for the calculations. Maybe to account for the fact that a rolling game piece is moving half as fast as the conveyor? Maybe for safety factor? I'm not exactly sure.
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Re: JVN tabs question

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The intake tab is for calculations for a conveyor sliding/rolling a game piece and the linear motion tab is for a winch moving a linear mechanism.

The linear tab uses load applied directly to the winch and the intake tab uses drag load of the game piece. It doubles the drag load number for the calculations. Maybe to account for the fact that a rolling game piece is moving half as fast as the conveyor? Maybe for safety factor? I'm not exactly sure.

OK I get what you are saying but it DOUBLES the current draw and I would think a rolling game piece would reduce the current draw.
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Re: JVN tabs question

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Originally Posted by Bruceb View Post
OK I get what you are saying but it DOUBLES the current draw and I would think a rolling game piece would reduce the current draw.
It could be assuming you're attempting to lift the object rather than just draw it in (IE, an intake that feeds up into a hopper or something). Perhaps in addition to loosing 50% of the speed of the roller, you also loose 50% of the torque?
I suspect sticking a 150lb ball into an intake roller is going to present some different results than using that same roller to winch up a 150lb robot, whatever the case may be.

If you want the correct answer to the question of what that tab assumes, I suspect you might have better luck PMing JVN.
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