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Fixing up the Ford Model A Doodlebug


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#106 tiretrx ONLINE  

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Posted November 17, 2017 - 08:45 AM

Speaking of the Loboy; maybe this will give you the itch.

attachicon.gifspeedster.jpg

 

That's a hoot, Rich. Is that two auto fenders joined, and one headlight? Like a tractor Minion!

 

The Loboy is right next to the Doodlebug in the shop. It not liking me right now.


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#107 LilysDad ONLINE  

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Posted November 17, 2017 - 01:22 PM

The description with the photo said it was made with a '51 Gravely and Studebaker fenders.


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#108 tiretrx ONLINE  

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Posted December 05, 2017 - 03:50 PM

Been waiting on a part to come in, but in the mean time I changed some gaskets and fluids. The part was another Model AA u-joint. These things are rarer than hen's teeth I've come to find out. Model A u-joint? No problem. AA's......good luck. Fortunately, because I'm stubborn, and got lucky, I tracked one down on the Ford Barn forum. Not only was it in great shape, but it was very reasonable(35 skins). My thanks to Roger on the West Coast!

 

Now, I have two. Now, I can make a proper driveshaft(I hope) using authentic period Ford AA parts. Thing is......I don't have a drive shaft. Checked into 1-1/4" ten splines. They go for money, and they're from a country I'm not high on getting my stuff from. So, after some noodling, to the vertical mill I went. The normal process, as I understand it, is to use a round milling cutter with the proper profile in a horizontal mill running axially down the shaft, index the shaft, repeat. I don't have that setup. Time to improvise.

 

First we turned a couple blank ends on a lathe.

db spline1.jpg

 

That was chucked in a 4th axis in a vertical mill. Using a 7/32" end mill, I made 10 blind end slots 36 degrees apart. At the blind end, I ramped out the end mill for a smoother transition. It somewhat replicates what the radius of a round milling cutter would produce.

 

db spline2.jpg

 

If you look close at this picture, you can see that this process creates a "bow tie" shape to the splines.

 

db spline3.jpg

 

To make the splines square I took an 1/8" end mill, and after an initial index of 18 degrees, I milled each side of the 10 splines. They being indexed at 36 degrees. Part came out to size and slid right in the u-joint on the first try. Step one, done.

 

db spline4.jpg db spline5.jpg

 

 


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#109 jdcrawler OFFLINE  

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Posted December 05, 2017 - 04:05 PM

That is an excellent job of index milling.

I really like this idea and think that it will make a much better looking drive shaft then the flex tube.


Edited by jdcrawler, December 05, 2017 - 04:21 PM.

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#110 KennyP ONLINE  

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Posted December 05, 2017 - 05:08 PM

Glad you have the machining experience to tackle this! Looks great!


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#111 Cvans ONLINE  

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Posted December 05, 2017 - 06:53 PM

Nice to see your back to making progress. Kind of been missing your posts. 


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#112 SimplyRad OFFLINE  

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Posted December 06, 2017 - 08:02 AM

Making a gear or spline shaft is an interesting process. The factory where I worked as a maintenance machinist had a few gear cutters and an indexing machine. How did you index without one?


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#113 tiretrx ONLINE  

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Posted December 06, 2017 - 09:31 AM

That is an excellent job of index milling.

I really like this idea and think that it will make a much better looking drive shaft then the flex tube.

 

Thanks a lot, Ray. Once I got through the "hope" of the flex working out, I realized it was time to pony up and try and do it proper. Just another reason my projects go on so long, I guess.

 

Glad you have the machining experience to tackle this! Looks great!

 

Thanks Kenny, much appreciated.

 

Nice to see your back to making progress. Kind of been missing your posts. 

 

Thanks Chris, it's good to have the part in hand, so we can get busy again.

 

Making a gear or spline shaft is an interesting process. The factory where I worked as a maintenance machinist had a few gear cutters and an indexing machine. How did you index without one?

 

The chuck in the mill is a 4th axis. Basically, I program it's positions using an A readout. I do have a Bison conventional indexing chuck for the Bridgeports, but it's pretty tired, and I didn't have the right milling cutter.


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#114 tiretrx ONLINE  

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Posted December 08, 2017 - 03:56 PM

Worked on the driveshaft today. First parted the splined ends off, then turned a plug on the end. These will get welded onto the ends of the 6" long piece of pipe.

 

db dshaft1.jpg db dshaft2.jpg


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#115 KennyP ONLINE  

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Posted December 08, 2017 - 04:01 PM

Nice work! Know who to go to if I need something like this! LOL


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#116 MFDAC ONLINE  

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Posted December 08, 2017 - 09:19 PM

Great work Ellis, keep the updates coming!

 

DAC


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#117 SimplyRad OFFLINE  

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Posted Yesterday, 09:36 AM

That is some good work.


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#118 CRFarnsworth OFFLINE  

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Posted Yesterday, 10:50 AM

When you weld them will you need to index them to align the splines or will it matter?

 

The voice in my head tells me the yokes will need to be aligned to each other.    Rick


Edited by CRFarnsworth, Yesterday, 10:53 AM.

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#119 KennyP ONLINE  

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Posted Yesterday, 05:45 PM

When you weld them will you need to index them to align the splines or will it matter?

 

The voice in my head tells me the yokes will need to be aligned to each other.    Rick

Good thought!


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#120 tiretrx ONLINE  

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Posted Today, 02:20 PM

When you weld them will you need to index them to align the splines or will it matter?

 

The voice in my head tells me the yokes will need to be aligned to each other.    Rick

 

If I'm understanding the question right, no I don't think that would matter, as the tranny and differential splines are free to move where necessary to align. Did I align them when I welded them up? Absolutely. I'm a bit anal with things like that. It just looks better to me  :smilewink:


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