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The Builder
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Builder Last Online: Nov 2020
Model Scale: 1/8
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Started: 05-03-13
Build Revisions: Never
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Gentlemen,
In xken's thread about the Allerton steam pumper there was some conversation about my rearend looking good at the NAMES show. While this may have been taken out of context (never) I thought that maybe I could enlighten everyone.
Many years ago when I built the 302 V-8 engine I would get asked from time to time "when are you going to build the rest of the car?" To this I would respond "probably won't happen."
Now a couple of years ago I built a 1/3 size Borg-Warner T-5 transmission and when I would put it out for display I would get asked "when are you going to build the rest of the car?" To this I would respond "probably won't happen."
Well this winter's project was to build a 1/3 scale 9 inch Ford differential. I had all 3 pieces on display at the NAMES show the end of April and upon seeing them people asked the same question. This time I said, "I'm working on it." Somewhere in the future I hope to have the full chassis complete and eventually turn it into a 32 Ford street rod.
The project got started when I was at a buddies house for our weekly car get-together. Over in the corner I spotted this 9 inch center section sitting in a plastic bucket. The winter idea was sparked and I took the 'heavy' bucket home. Over the next couple of weeks I cleaned it up, pulled it apart and measured and made sketches of all the parts. Upon completion I sat down with my Cad program and started making formal drawings.
With the full sized diff having hypoid gearing and while having seen this type of gearing many times I really didn't know what was involved in recreating it so it was off to Youtube and Google. What I came to find out was that hypoid gearing is a gear generating process that involves way more than the home shop machinist can create so an alternative gearing setup was investigated. I found in some old magazines a construction article with the attendant math to create what is known as skew bevel gearing. With a lot of math help I was able to make the required cutters and cut a test set from Delrin. With the gearing proven I went ahead and cut the gears from steel (ring gear) and brass (pinion).
Had I not been able to cut gears the project wouldn't have gone any farther.
In xken's thread about the Allerton steam pumper there was some conversation about my rearend looking good at the NAMES show. While this may have been taken out of context (never) I thought that maybe I could enlighten everyone.
Many years ago when I built the 302 V-8 engine I would get asked from time to time "when are you going to build the rest of the car?" To this I would respond "probably won't happen."
Now a couple of years ago I built a 1/3 size Borg-Warner T-5 transmission and when I would put it out for display I would get asked "when are you going to build the rest of the car?" To this I would respond "probably won't happen."
Well this winter's project was to build a 1/3 scale 9 inch Ford differential. I had all 3 pieces on display at the NAMES show the end of April and upon seeing them people asked the same question. This time I said, "I'm working on it." Somewhere in the future I hope to have the full chassis complete and eventually turn it into a 32 Ford street rod.
The project got started when I was at a buddies house for our weekly car get-together. Over in the corner I spotted this 9 inch center section sitting in a plastic bucket. The winter idea was sparked and I took the 'heavy' bucket home. Over the next couple of weeks I cleaned it up, pulled it apart and measured and made sketches of all the parts. Upon completion I sat down with my Cad program and started making formal drawings.
With the full sized diff having hypoid gearing and while having seen this type of gearing many times I really didn't know what was involved in recreating it so it was off to Youtube and Google. What I came to find out was that hypoid gearing is a gear generating process that involves way more than the home shop machinist can create so an alternative gearing setup was investigated. I found in some old magazines a construction article with the attendant math to create what is known as skew bevel gearing. With a lot of math help I was able to make the required cutters and cut a test set from Delrin. With the gearing proven I went ahead and cut the gears from steel (ring gear) and brass (pinion).
Had I not been able to cut gears the project wouldn't have gone any farther.
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