1953 Ford standard transmission (1/3 scale)

[gbritnell]

Trying to fill up the winter with projects so I took my CAD drawings for the 1953 Ford standard transmission and made Solidworks models for all the parts. My CAD drawings are meant for machining from metal so changes had to be made to make them printer friendly. Things like shaft to hole dimensions, ease and assembly of printed parts and the big one for me making the parts so I don't need as much support material.
Anyway, I'm happy the way they came out. You can even shift gears albeit carefully.
The trans is a 1/3 scale model of the real thing. About 10 inches end to end. I started with PTEG, not my favorite but initially everything was going fine then my Ender 3 Neo decided it didn't like the PTEG so I switched to tough PLA.
The problem with the PTEG was that flat surfaces on the build plate would curl up at one corner. I tried adjusting temps and feed rates but no luck. The build plate was level and clean with just a hint of hair spray. The PLA has to be knocked of when cool so I know it's not that.

 

[GreenTwin]

That is a most impressive 3D printing/design project.
Very nice.
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[timo_gross]

Trying to fill up the winter with projects so I took my CAD drawings for the 1953 Ford standard transmission and made Solidworks models for all the parts. My CAD drawings are meant for machining from metal so changes had to be made to make them printer friendly.

Are you planning to machine the metal parts as well?
I saw that a while ago. Thought that would be a nice project to make, but It is too much challenge for now. Making the housing seems to be the most difficult part.

Is the function of this straight gearbox similar to your model?

 

[kvom]

Are you willing to provide/sell the STL files? I have a MarkForged printer that uses a very hard medium that could work very well here. It doesn't get much use, so having a fun project would be interesting.

 

[gbritnell]

Hi kvom,
I'm putting together a build information sheet so soon as I get it together you can send me a PM for my email address and we will talk.

 

[JimSvarv]

Looking good!
Did you also make a model with straight cut gears?
Also how does one make the gears end up on the same centre to centre distance?
I did try to make a cad model of the webster and I think I followed the gear specs quite well.
But the gear axles didn't end up I the same place as in the drawing...
Doesn't matter much in that case but for a transmission that wouldn't work.

 

[kvom]

Hi kvom,
I'm putting together a build information sheet so soon as I get it together you can send me a PM for my email address and we will talk.

I'll wait for your post here. Thanks. I'll be at Cabin Fever if you're going.

 

[gbritnell]

Hi Jim,
When I built the actual metal model of the Borg Warner T5 transmission years ago I didn't know how to make helical gears so I made spur gears. To maintain the proper spacing between the main shaft and the countershaft I had to use a couple of different pitch diameter gears which meant making my own oddball cutters.
When I made the metal model of the 53 Ford transmission I had been making helical gears for awhile, thanks in part to the fixture that Chuck Fellows designed. When using spur gears of a certain Mod Or P.D. you are limited to the ratios that can be used by the diameters for a certain tooth count. The really neat aspect of using helical gears is that once you determine the shaft spacing and a gear ratio close to what you want by changing the helix angle you can dial in the perfect center to center spacing. Helical gears use the same Mod or P.D. tooth profiles but by changing the helical angle to greater than zero, like a spur gear, the pitch diameter will increase. The wonderful world of Trigonometry. On a piece of paper draw a straight line from left to right. This would be the line representing the center of one tooth of a spur gear. If you fold the paper at 90 degrees at the end of the line and draw a tooth profile you have one spur gear tooth. Now vdraw a line at 45 degrees from the right end of the line out to the fold. This will represent a helical centerline angle of 45 degrees. With scissors split the folded 90 degree angle just ahead of the tooth profile you drew. Now fold the paper at 90 degrees to the 45 degree line and draw the tooth profile again. If you wold project 2 lines from the tooth profile representing the widest point of the tooth (pitch circle) parallel to the 45 degree line you now have a standard tooth at 45 degrees. Now draw a line at 90 degrees to the very first line up through the 3 lines you drew representing the helical tooth. Now measure the width of the tooth along the 90 degree line. The measurement is wider on the 45 degree line. So for 2 gears, one spur and one helical with the same Mod or P.D. and same tooth count you have 2 different pitch circles.

 

[gbritnell]

I can't make Cabin Fever this year due to some health issues.

 

[Bentwings]

Trying to fill up the winter with projects so I took my CAD drawings for the 1953 Ford standard transmission and made Solidworks models for all the parts. My CAD drawings are meant for machining from metal so changes had to be made to make them printer friendly. Things like shaft to hole dimensions, ease and assembly of printed parts and the big one for me making the parts so I don't need as much support material.
Anyway, I'm happy the way they came out. You can even shift gears albeit carefully.
The trans is a 1/3 scale model of the real thing. About 10 inches end to end. I started with PTEG, not my favorite but initially everything was going fine then my Ender 3 Neo decided it didn't like the PTEG so I switched to tough PLA.
The problem with the PTEG was that flat surfaces on the build plate would curl up at one corner. I tried adjusting temps and feed rates but no luck. The build plate was level and clean with just a hint of hair spray. The PLA has to be knocked of when cool so I know it's not that.

Totally cool model ! We just got a large size 3 dprinter . Making our first prints. Project #1 was to make a new case for my 7 year old Apple I phone first try the tabs broke off For of the for the snap together feature of the case. New case being printed as this is being typed. We already have a note book of projects for our up coming giant scale
WW 2 warbirds. 6 50 cal browning anm 2 operating gun bays static will have moving ammo belt with recoiling guns. Ejection chute for dropping simulated belt clips and bullet cases ( bio degradable Airsoft BB. Field rules prohibit dropping non degradable items. Still searching for degradable filament. Big dream is 3 d printed Hogson 18 cyl radial desk top model. Instant thought is maybe you your trans mounted backwards as overvdrive for supercharger. Question how much $ fo r a copy of your files . We are using Fusion 360. We already have printed landinding gear for a SBD Heldiver. I’m just digging in stored items for Hogson 18 cyl. May just order 7 cyl plans and print 4 units. Then print the gear coupling we used to connect engines on twin engine dragster years ago. Thus semi scale 28 cyl radial engine ( desk top model.

Hi kvom,
I'm putting together a build information sheet so soon as I get it together you can send me a PM for my email address and we will talk.

great I’ll try and look for it I’m on the verge of getting new laptop the 3d printer. Long term a 3D printed desk to 28 cyl radial engine driven by electric motor. Looked into compressed air driven option but that’s too much extra work for now.

 

[timo_gross]

Hi Jim,
... When using spur gears of a certain Mod Or P.D. you are limited to the ratios that can be used by the diameters for a certain tooth count. The really neat aspect of using helical gears is that once you determine the shaft spacing and a gear ratio close to what you want by changing the helix angle you can dial in the perfect center to center spacing. Helical gears use the same Mod or P.D. tooth profiles but by changing the helical angle to greater than zero,

Something that is really helpful to know, it also allows to use Metric gear cutters instead of DP cutters and vice versa.
I noticed that some of the gear generating softwares reduce the "normal module" when modelling gears. That is working for 3d printing and keeps pitch diameter same between helical and spur gear of same tooth count.
But it makes things really a pain when the unexperienced "designer" tries to purchase sa(i)d gears. I ran into that issue asking myself why the CAD is giving me the wrong gear blank size? Then I noticed that the "normal module" was secretly changed.

Example: All three gears are same module (1), same tooth count (20) and same pressure angle (20°). Left to right: 45° helix angle "normal module", 20° helix angle "normal module" and 20° helix angle "radial module". (radial module means: the projection described by gbritnell is "reversed" instead of the tooth getting bigger, the size of the respective gap is reduced #8 (hope that makes sense)

Greetings Timo

 

[GreenTwin]

You can download 2D and 3D files for gears at McMaster Carr.

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