The Ford Barn

Tom Elliott · 01-17-2015, 11:28 PM

How much would one shim on a tapered axle shaft move the hub outward? I know it would be more than the thickness of the shim but was wondering how much. Thanks, Tom

Tom Wesenberg · 01-18-2015, 01:25 AM

You'd have to use math and measure the slope of the axle and the shim thickness. Just looking at the slope, I'd estimate the hub would move out about 3 times the thickness, but it would be good to know the true answer.

tbirdtbird · 01-18-2015, 01:39 AM

just use 2 of them per side; that is how Tom Endy does it

JRHoward · 08-07-2015, 03:53 PM

If the small end of the taper is about 7/16 and the larger end is about 17/16, and the length is about 45/16 of an inch then the horizontal movement would be about 45/(17-7) or 4.5 times the shim thickness. A .004 shim should move the hub out about ..018 of an inch. Two shims gives about 1/32 movement.

d.j. moordigian · 08-07-2015, 05:46 PM

Uhhhh.......no wonder the U.S. is in economic trouble !

I think you fellas need to re-think the amount of movement. On a .004" shim, it
mite be .003",....and that's on the LARGE side.

160B · 08-07-2015, 06:04 PM

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Quote:

Originally Posted by d.j. moordigian

Uhhhh.......no wonder the U.S. is in economic trouble !

I think you fellas need to re-think the amount of movement. On a .004" shim, it
mite be .003",....and that's on the LARGE side.

I agree with the above.

Apply a common sense look at the geometry. If the seating area was flat to flat the .004" shim would move the hub .004", the shim thickness. Now taper the seating surface, why would the .004" shim on a tapered seat cause the hub to move .018", 5 times the thickness of the shim???

The movement would be the thickness of the shim less any compression of the shim that might occur.

I hope this is not the result of the teaching of Common Core Math!

http://truthinamericaneducation.com/...math-problems/

Pete · 08-07-2015, 06:09 PM

It's the fault of the school system, totally.

Sparky · 08-07-2015, 06:20 PM

Two shims moved mine about 1/8"

Bob Johnson · 08-07-2015, 06:52 PM

Here is my math using a 0.004" shim and a 4.12 degree angle I get 0.056" movement.

Here is a blow up.

taffrail · 08-07-2015, 06:59 PM

You forgot about the crunch factor, all I know is one worked for me.

MikeK · 08-07-2015, 07:12 PM

Thanks Bob. Nice to see a real answer complete with a graphic.

Fred K-OR · 08-07-2015, 07:45 PM

Tom, you can get two different thickness of the shim. So you may want to order both and see which one will work best for you.

And the next question is, why do you need to move the hub out? Is it rubbing on the brake shoes? Or the nut will not tighten? Or ???

I had a hub rubbing on the brake shoe and one thin one did the job for me. A thick one was to much.

160B · 08-07-2015, 08:45 PM

Quote:

Originally Posted by Bob Johnson

Here is my math using a 0.004" shim and a 4.12 degree angle I get 0.056" movement.Here is a blow up.

I went back to my geometry and you are correct!!!

I get 0.0556

Brendan · 08-08-2015, 06:51 AM

Quote:

Originally Posted by Tom Elliott

How much would one shim on a tapered axle shaft move the hub outward? I know it would be more than the thickness of the shim but was wondering how much. Thanks, Tom

why do you need them?

jw hash · 08-08-2015, 09:15 AM

Brendan
over the years when the key way gets sheared off and the hub spins on the axle, it bores out the hub and turn down the axle. when you put the hub back on, it goes on to far and the drum and or hub will rub on the backing plate and brake parts. using the shims it moves the hub and drum out.

d.j. moordigian · 08-08-2015, 01:48 PM

I talked to the engineer, next door, about this yesterday. He assured me that there
was no way that the shim would move it that far!

Well, today I sent him the drawing, and he said "no-way". So we took an A axle shaft
and did it in "Solid Works", and did the problem.

Yep,...you guy's are correct,...it does move it about .056"! Well done!

01-17-2015, 11:28 PM	#1
Tom Elliott Senior Member Join Date: Oct 2014 Location: Peyton, Co. Posts: 100	Tapered axle shims question How much would one shim on a tapered axle shaft move the hub outward? I know it would be more than the thickness of the shim but was wondering how much. Thanks, Tom

01-18-2015, 01:25 AM	#2
Tom Wesenberg Senior Member Join Date: May 2010 Location: Mpls, MN Posts: 27,582	Re: Tapered axle shims question You'd have to use math and measure the slope of the axle and the shim thickness. Just looking at the slope, I'd estimate the hub would move out about 3 times the thickness, but it would be good to know the true answer.

01-18-2015, 01:39 AM	#3
tbirdtbird BANNED Join Date: May 2012 Location: inside your RAM Posts: 3,134	Re: Tapered axle shims question just use 2 of them per side; that is how Tom Endy does it __________________ '31 180A

08-07-2015, 03:53 PM	#4
JRHoward Junior Member Join Date: Aug 2014 Posts: 1	Re: Tapered axle shims question If the small end of the taper is about 7/16 and the larger end is about 17/16, and the length is about 45/16 of an inch then the horizontal movement would be about 45/(17-7) or 4.5 times the shim thickness. A .004 shim should move the hub out about ..018 of an inch. Two shims gives about 1/32 movement.

08-07-2015, 05:46 PM	#5
d.j. moordigian Senior Member Join Date: May 2010 Location: Fresno, Ca. Posts: 3,636	Re: Tapered axle shims question Uhhhh.......no wonder the U.S. is in economic trouble ! I think you fellas need to re-think the amount of movement. On a .004" shim, it mite be .003",....and that's on the LARGE side.

08-07-2015, 06:09 PM	#7
Pete Senior Member Join Date: May 2010 Location: Wa. Posts: 5,409	Re: Tapered axle shims question It's the fault of the school system, totally.

08-07-2015, 06:20 PM	#8
Sparky Senior Member Join Date: May 2010 Location: Rhode Island Posts: 649	Re: Tapered axle shims question Two shims moved mine about 1/8"

08-07-2015, 06:52 PM	#9
Bob Johnson Senior Member Join Date: May 2010 Location: California Posts: 979	Re: Tapered axle shims question Here is my math using a 0.004" shim and a 4.12 degree angle I get 0.056" movement. Here is a blow up. Last edited by Bob Johnson; 08-07-2015 at 06:55 PM. Reason: add information

08-07-2015, 06:59 PM	#10
taffrail Senior Member Join Date: Dec 2010 Location: Hingham, MA Posts: 135	Re: Tapered axle shims question You forgot about the crunch factor, all I know is one worked for me.

08-07-2015, 07:12 PM	#11
MikeK Senior Member Join Date: May 2010 Location: Windy City Posts: 2,919	Re: Tapered axle shims question Thanks Bob. Nice to see a real answer complete with a graphic.

08-07-2015, 07:45 PM	#12
Fred K-OR Senior Member Join Date: May 2010 Location: Stayton, Oregon Posts: 3,806	Re: Tapered axle shims question Tom, you can get two different thickness of the shim. So you may want to order both and see which one will work best for you. And the next question is, why do you need to move the hub out? Is it rubbing on the brake shoes? Or the nut will not tighten? Or ??? I had a hub rubbing on the brake shoe and one thin one did the job for me. A thick one was to much. __________________ Fred Kroon 1929 Std Coupe 1929 Huckster

08-08-2015, 09:15 AM	#15
jw hash Senior Member Join Date: May 2010 Location: Auburn Washington Posts: 2,552	Re: Tapered axle shims question Brendan over the years when the key way gets sheared off and the hub spins on the axle, it bores out the hub and turn down the axle. when you put the hub back on, it goes on to far and the drum and or hub will rub on the backing plate and brake parts. using the shims it moves the hub and drum out.

08-08-2015, 01:48 PM	#16
d.j. moordigian Senior Member Join Date: May 2010 Location: Fresno, Ca. Posts: 3,636	Re: Tapered axle shims question I talked to the engineer, next door, about this yesterday. He assured me that there was no way that the shim would move it that far! Well, today I sent him the drawing, and he said "no-way". So we took an A axle shaft and did it in "Solid Works", and did the problem. Yep,...you guy's are correct,...it does move it about .056"! Well done!