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? Proper Use of Feeler Gauge

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Ken Reese

12-22-1999 07:39:11




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I am reassembling my 1950 John Deere Model B and have a question about the use of a feeler gauge.

This is in regard to checking the proper backlash in the power takeoff between the bevel gear and the bevel pinion/drive shaft. The manuals says to use a feeler gauge or dial indicator to check for the correct backlash (clearance) between the bevel and pinion gears. Recommended backlash is .006 to .010. WHEN CHECKING SHOULD THE BLADE OF THE FEELER GAUGE GO THROUGH THE ENTIRE DEPTH OF THE GEAR TEETH? I have never done this before and want to be sure I have the proper backlash. There seems to be more clearance at the top. As the gauge goes further into the space between the teeth, the clearance is less. What is the proper procedure?

Thanks for your help.
Ken Reese
E-mail: [email protected]

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RonMC

12-22-1999 17:47:10




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 Re: ? Proper Use of Feeler Gauge in reply to Ken Reese, 12-22-1999 07:39:11  
Just my 2 cents. If you're doing much of this kind of resto/repair, buy a dial indicator and magnetic base. They are so much faster and more accurate than a feeler gauge in setting up any kind of free play, that the feelers, though they have their place, just can't compare.



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Gerald J.

12-22-1999 11:02:07




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 Re: ? Proper Use of Feeler Gauge in reply to Ken Reese, 12-22-1999 07:39:11  
All the way in. That's the backlash you'd measure with the dial indicator.

Gerald J.



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Ken Reese

12-22-1999 20:21:19




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 Re: Re: ? Proper Use of Feeler Gauge in reply to Gerald J., 12-22-1999 11:02:07  
I have a dial indicator. Where should the tip of the dial indicator be placed? I can only get it on the pinion/drive shaft at the top or outside where the two gears intersect.

Ken Reese
E-mail: [email protected]



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Gerald J.

12-22-1999 21:28:34




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 Re: Re: Re: ? Proper Use of Feeler Gauge in reply to Ken Reese, 12-22-1999 20:21:19  
The dial indicator should be on a tooth, doesn't matter which gear or where on the gear but tangential to the gear. Then you move the gear touching the dial indicator while holding the other gear fixed and see how much the gear tooth moves between contacts. That's the backlash. If you can't get it direct on a tooth you might get it on some other part of the shaft so long as its at the same diameter circle as the gear on that shaft. Maybe a pair of vice grips even or a clamp of some sort. Just hold the same radius and its a valid measurement.

Gerald J.

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RonMC

12-23-1999 18:02:30




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 Re: Re: Re: Re: ? Proper Use of Feeler Gauge in reply to Gerald J., 12-22-1999 21:28:34  
Exactly right.



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