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Participant

Join Date: Feb 2012
Posts: 4

# Regarding Backlash

05/09/2012 10:28 PM

I have application where I have to move weight say 200 kg with help of ball screw and I have connected planetary gearbox having backlash 5arcmin. What will be backlash at output of ball screw as it is connected to planetary gearbox of 5 Arcmin or I have to move with gearbox having minimum backlash.

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Guru

Join Date: May 2009
Location: Richland, WA, USA
Posts: 20128
#1

### Re: Regarding Backlash

05/09/2012 10:41 PM

Not calculable from given information; the ball screw backlash is basically independent of the gearbox, except for the small contribution of 5 arcmin ÷ (screw threads per unit).

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Anonymous Poster #1
#7
In reply to #1

### Re: Regarding Backlash

05/10/2012 12:43 AM

The calculation part (which is virtually irrelevant) needs also to be divided by 360 degrees. (That just makes the screw backlash even smaller.)

ξ

Participant

Join Date: Feb 2012
Posts: 4
#2

### Re: Regarding Backlash

05/09/2012 10:59 PM

for Example say i have to move weight say 535lb with help of ball screw having 1.875 in lead and i have connected planetary gearbox having backlash 5arcmin to ballscrew ,what will be backlash at output of ball screw as it is conected to planetary gearbox of 5 Arcmin

Guru

Join Date: May 2009
Location: Richland, WA, USA
Posts: 20128
#3
In reply to #2

### Re: Regarding Backlash

05/09/2012 11:02 PM

Please see post 1.

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Guru

Join Date: Oct 2008
Posts: 40597
#4

### Re: Regarding Backlash

05/09/2012 11:45 PM

If a chicken and a half can lay an egg and a half in a day and a half, how many hens to lay six eggs in six days?

Guru

Join Date: May 2009
Location: Richland, WA, USA
Posts: 20128
#5
In reply to #4

### Re: Regarding Backlash

05/09/2012 11:50 PM

Well, this time the answer is not 42!

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Guru

Join Date: Jan 2007
Location: Moses Lake, WA, USA, Thulcandra - The Silent Planet (C.S. Lewis)
Posts: 4088
#6
In reply to #4

### Re: Regarding Backlash

05/10/2012 12:12 AM
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Guru

Join Date: Jan 2010
Location: Mineral wells Tx
Posts: 617
#8

### Re: Regarding Backlash

05/10/2012 5:37 AM

Better, Use This

Anonymous Poster #2
#9

### Re: Regarding Backlash

05/10/2012 6:18 PM

i'm not sure if i undstand the question. set the backlash of each component to specs reguardless off the overall lash.

Score 1 for Off Topic
Guru

Join Date: Jan 2008
Posts: 1756
#10

### Re: Regarding Backlash

05/10/2012 10:57 PM

NO, YOU DO NOT!

The question is nonsense posted as homework.

You may need to move a mass.

You may need to arrive at a location with some precision.

Please note, that in these statements neither a screw nor its precision was mentioned as any possible factor.

Restate your question in some sane fashion.

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Guru

Join Date: Aug 2008
Location: City of destiny, INDIA
Posts: 775
#11
In reply to #10

### Re: Regarding Backlash

05/11/2012 4:14 AM

GA

Guru

Join Date: May 2009
Location: Red Hook, New York (Mid-Hudson River Valley)
Posts: 4370
#12

### Re: Regarding Backlash

05/11/2012 8:32 AM

Obvious Homework problem! FAIL!!!!

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Score 1 for Good Answer
Guru

Join Date: Dec 2006
Posts: 3347
#13

### Re: Regarding Backlash

05/11/2012 9:45 AM

It's a matter of the gear ratio. Please draw a picture showing all dimensions and gear ratios, and label what is known and what it wanted. Then we will have a chance of helping you.

Score 2 for Off Topic
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