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Hudy Knob Job recalibration


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#1 Pablo

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Posted 11 April 2013 - 10:52 AM

My Hudy Knob Job by Triggerman has seen a lot of use, and it was time for a tune up/recalibration.

I originally used it for wing car wheels, but since then I have expanded all over the map, from 1.2" Manta Ray wheels to .620 flexi wheels, and everything in between.  :)

 

I started with this:

DSC06958.JPG

 

Re-zeroed the calibration knob using the allen wrench:

DSC06965.JPG

 

Started with a huge JK donut/hub:

DSC06973.JPG

 

First cut at zero was .895 

DSC06976.JPG

 

Now I have coverage from .895 to .620

DSC06984.JPG

 


Paul Wolcott




#2 JohnnySlotcar

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Posted 11 April 2013 - 11:19 AM

You are the new "Knob Job" king! IMHO


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#3 Dennis David

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Posted 11 April 2013 - 12:09 PM

Yep, but don't spend too much time playing with your knob.

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#4 Pablo

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Posted 11 April 2013 - 12:17 PM

Good thing I posted this thread in "General Technical Info"

instead of "Pablo's Builds" :laugh2:  Blame Dale Ryan for the funky name, not me :laugh2:


Paul Wolcott

#5 Pappy

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Posted 27 August 2013 - 06:46 AM

Thanks for the tips Pablo. I put a diamond wheel on mine and it needs to be recalibrated.


Jim "Butch" Dunaway
 
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#6 penske

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Posted 27 August 2013 - 07:47 AM

Hi Pablo.   On your tire chart you have 0.0 = .895 and so on down to  3.7 = .670.  Does that count for any shrinkage after they cool down ?

 

It's a bit funny I'm talking about  "shrinkage   on a post  about a  "Knob Job"   :laugh2:   Oh well i guess it's better then beating to death motor seals and 

blueprinting of motors. :dash2:

 

Roger Ruggieri


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#7 MSwiss

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Posted 27 August 2013 - 08:37 AM

Just curious, if one turn, (0.0 to 1.0) goes from .895 to .825 / is .070, shouldn't the size at 3.0 be minus .140 or .685, instead of .675 ?


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#8 Pablo

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Posted 27 August 2013 - 11:17 AM

Roger, no, I didn't do much "cool down" research.  I trued mine real slow anyway.

But the point is moot.  Every machine is going to calibrate slightly different anyway.

There will always be a fudge factor also, due to air temp, rotation of the earth, etc.

For example, If I wanted a pair of .720's, which are listed in my unit as 2.4, I'd probably start at about 2.2

 

Mike, your math works, but heck, that's only 5 thou per side variance, maybe a speck of dust on the knobber threw the readings off :laugh2:


Paul Wolcott

#9 penske

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Posted 27 August 2013 - 12:51 PM

Never, ever underestimate the horrible effects of shrinkage  :o 


Roger Ruggieri

#10 JerseyJohn

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Posted 27 August 2013 - 05:14 PM

Roger whatever size your shooting for. I go .015 over for treated and .07 for wonder

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#11 John Streisguth

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Posted 27 August 2013 - 08:06 PM

JJ, I assume you mean .007 for wonder?


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