Reaming drive shaft bushing

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John Illinois
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Reaming drive shaft bushing

Post by John Illinois » Mon Jan 06, 2020 4:35 pm

The MTFCA book calls for .002-.003” clearance on drive shaft. What is the best size to ream it?

John


Original Smith
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Re: Reaming drive shaft bushing

Post by Original Smith » Mon Jan 06, 2020 4:45 pm

Why not try a combination reaming and facing tool. They are available.

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RajoRacer
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Re: Reaming drive shaft bushing

Post by RajoRacer » Mon Jan 06, 2020 5:07 pm

You have to consider the lubricant used - grease, so at least that.

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Pep C Strebeck
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Re: Reaming drive shaft bushing

Post by Pep C Strebeck » Mon Jan 06, 2020 5:14 pm

John Illinois wrote:
Mon Jan 06, 2020 4:35 pm
What is the best size to ream it?

John
That would depend on the diameter of the machined bearing surface on your drive shaft. A new drive shaft should be 1.000" in diameter and for a used drive shaft the upper wear limit would be 0.005" (0.995" minimum diameter). So if you are going by the MTFCA booklet, 0.002" over whatever your major diameter is. The last axle/drive shaft that I had done needed a new drive shaft and the bushing was reamed at 1.000" and had a slip fit. Hopefully this is helpful.
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Re: Reaming drive shaft bushing

Post by Allan » Mon Jan 06, 2020 11:57 pm

It depends on any wear on the driveshaft journal to a large degree. If the shaft is worn .010" then the bush needs to be undersized, and a fixed reamer will not be of much use. To use a driveshaft with such wear will also mean the square end needs to be machined back to allow an undersized bush to slide over it to run on the worn journal.
If the shaft is new, none of this applies.

Allan from down under.

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Re: Reaming drive shaft bushing

Post by TRDxB2 » Tue Jan 07, 2020 2:40 am

Allen - you brought out the important point. No matter what your measure you can start reducing the size of the square end to fit through the bushing. If you do that then it will be loose in the u-joint, unless you have a u-joint with an undersized square end. ;)


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Re: Reaming drive shaft bushing

Post by Kerry » Tue Jan 07, 2020 3:22 am

The flats would remain the same, only the corners would require machining.

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Re: Reaming drive shaft bushing

Post by Mark Gregush » Tue Jan 07, 2020 3:32 am

The drive shaft square end only gets reduced a small amount on the corners when you have them cleaned up. The corners in hole in the U-joint are not right angles, they are curved and I would have to go look for sure but I think the radius of the corners are already larger then the corners on the drive shaft from the broching process. The flats turn the shaft not the corners.
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John Illinois
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Re: Reaming drive shaft bushing

Post by John Illinois » Tue Jan 07, 2020 9:59 am

Thanks for all the ideas. I am using a new drive shaft but I do not have it yet. If I have to enlarge the bushing, I plan on boring it close to size with a lathe. I will then install it and finish it with a hone.

John

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Re: Reaming drive shaft bushing

Post by Pep C Strebeck » Tue Jan 07, 2020 10:46 am

John Illinois wrote:
Tue Jan 07, 2020 9:59 am
I am using a new drive shaft but I do not have it yet.

John
There are 2 issues that I found with the newly made drive shafts, both on the machined square end for the universal joint. The first is the chamfer on the end, they only chamfer the edge of the machined flat surfaces and ignore the "corners" that are left (I apologize for the photo quality, it is the only one that I have):

IMG_6582_2.JPG
IMG_6583_2.JPG
Be sure to chamfer those four corners. If you look at an original Ford Drive shaft versus a modern made drive shaft you will see that Ford chamfered the entire leading edge and the newly made ones only chamfer what they machined. Those sharp edges can/will dig into your nicely reamed bushing and raise some material and create a bind.

Second, you may need to dress/break/reduce the aforementioned corners down their length to get the u-joint to fit. If you look at an original Ford drive shaft, they not only machined the flats for the u-joint, but also the corners that were left. The new drive shafts leave the corners at a 1.000" diameter and that can create an interference problem when trying to install the u-joint to the drive shaft. Check your u-joint fit to the drive shaft end and if it is tight or does not want to go on, that is your problem. On the original drive shafts, these "corners" were machined flat. Aside from those 2 issues, the drive shaft is excellent, they just missed a couple of steps.
"Remember son, there are two ways to do this: The right way, and your way” Thanks Dad, I love you too.

LOOKING FOR A LUFKIN Model 1671A Center Punch.


Topic author
John Illinois
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Re: Reaming drive shaft bushing

Post by John Illinois » Tue Jan 07, 2020 1:38 pm

Pep,thanks for the tip. My old driveshaft is in bad shape but I get the idea. I will make a 1" hole in a piece of aluminum and make sure everything clears and is not sharp.

John


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Re: Reaming drive shaft bushing

Post by rays22t » Wed Jan 08, 2020 8:28 pm

Has anyone welded a driveshaft end and machined it to 1.000". Thanks Ray


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Re: Reaming drive shaft bushing

Post by Allan » Wed Jan 08, 2020 10:36 pm

Ray, I have had a few hard chromed and ground back to 1.000" That way there's not so much heat involved, and the ground journal is smooth and hard.

Allan from down under.


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Re: Reaming drive shaft bushing

Post by Scott C. » Thu Jan 09, 2020 1:27 am

I recently did the rear axle on my roadster and with a new bushing and new drive shaft. All I had to do was run a ball hone in the bushing to clean up the bur from drilling the grease hole and polish the bore a bit and it fit fine. I just installed another one for my coupe and it was the same. The new bushings fit on the new drive shafts before pressing them in. So they compressed very little when installed. I think the press fit is around .002"?


Topic author
John Illinois
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Re: Reaming drive shaft bushing

Post by John Illinois » Thu Jan 09, 2020 9:10 am

That is good to hear.


rays22t
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Re: Reaming drive shaft bushing

Post by rays22t » Sun Feb 02, 2020 10:42 am

Thanks Allan. I like that idea! Ray

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