Downloads
BUILD Information
- Add a Comment
The Builder
About Builder
Builder Last Online: Nov 2020
Model Scale: 1/8
Rating: 
Thanks: 0
Thanks: 0
Started: 11-07-20
Build Revisions: Never
SupportedGentlemen,
Quite awhile back I presented my flathead (Fordillac) V-8 engine. In looking for a project I thought it would be neat to build a period transmission for it. I had already built a Borg-Warner T-5 for my 302 V-8 engine so I needed another for this engine. Through my son I got introduced to a fellow that's into flatheads and flathead powered vehicles. He offered me a trans to borrow and take measurements from so I took him up on it. I didn't do a full tear down but just far enough to get the dimensions I needed. This information along with the exploded views on the Van Pelt website gave me everything needed to make a set of drawings. The case and covers were machined from 6061 aluminum which is the standard material for most aluminum machining. The shafts were made from drill rod with special home-made cutters made to cut the spines. When I built the T-5 I had just delved into making helical gears and didn't want to 'practice' at that point but for this trans I decided that it was worth the extra effort to make it as close as possible.
Here's a little back story to making helical gears in the home shop. On one of the model engineering forums that I belong to a fellow came up with a fixture and the calculations for making helical gears. I built the fixture and practiced making gears because the flathead engine required them. The fixture is fairly simple, a block of aluminum that has a reamed hole for a shaft. On one end of the shaft is an adapter for holding the gear blank and on the other end is a helical template and an indexing plate to cut the needed number of teeth. The templates are made from 1/16 brass sheet. A helical gear, like a screw thread, has a lead to it. This means that if you take a point on the screw and follow it around until it comes back to the same longitudinal point it has advanced by X dimension. This is the lead. For a gear with a 45 degree helix this lead will change relative to the diameter of the gear. The larger the gear the farther the lead has to travel to get back to the same point. For each gear being cut, left hand or right hand and varying diameters a template is required so in the case of this transmission 7 templates were required.
The gears and shift collars slide on splines. These were taken from stock pieces purchased from Stock Drive Products and machined accordingly.
The main case required quite a few setups to create all the contours and shapes, the hardest of which was the conical bulge that had to meet the existing curved shape of the case. After machining the finish work was done with a Dremel
flex shaft using mounted stones and riffler files.
gbritnell
Quite awhile back I presented my flathead (Fordillac) V-8 engine. In looking for a project I thought it would be neat to build a period transmission for it. I had already built a Borg-Warner T-5 for my 302 V-8 engine so I needed another for this engine. Through my son I got introduced to a fellow that's into flatheads and flathead powered vehicles. He offered me a trans to borrow and take measurements from so I took him up on it. I didn't do a full tear down but just far enough to get the dimensions I needed. This information along with the exploded views on the Van Pelt website gave me everything needed to make a set of drawings. The case and covers were machined from 6061 aluminum which is the standard material for most aluminum machining. The shafts were made from drill rod with special home-made cutters made to cut the spines. When I built the T-5 I had just delved into making helical gears and didn't want to 'practice' at that point but for this trans I decided that it was worth the extra effort to make it as close as possible.
Here's a little back story to making helical gears in the home shop. On one of the model engineering forums that I belong to a fellow came up with a fixture and the calculations for making helical gears. I built the fixture and practiced making gears because the flathead engine required them. The fixture is fairly simple, a block of aluminum that has a reamed hole for a shaft. On one end of the shaft is an adapter for holding the gear blank and on the other end is a helical template and an indexing plate to cut the needed number of teeth. The templates are made from 1/16 brass sheet. A helical gear, like a screw thread, has a lead to it. This means that if you take a point on the screw and follow it around until it comes back to the same longitudinal point it has advanced by X dimension. This is the lead. For a gear with a 45 degree helix this lead will change relative to the diameter of the gear. The larger the gear the farther the lead has to travel to get back to the same point. For each gear being cut, left hand or right hand and varying diameters a template is required so in the case of this transmission 7 templates were required.
The gears and shift collars slide on splines. These were taken from stock pieces purchased from Stock Drive Products and machined accordingly.
The main case required quite a few setups to create all the contours and shapes, the hardest of which was the conical bulge that had to meet the existing curved shape of the case. After machining the finish work was done with a Dremel
flex shaft using mounted stones and riffler files. gbritnell
Build Photos
Show Complete First Post
Show Your Support
- This build may not be copied, reproduced or published elsewhere without author's permission.Please note: The first post will be displayed at the top of every page.
QUOTE 
Bookmarks