Offenhauser Mighty Midget Racing engine

Home Model Engine Machinist Forum

Help Support Home Model Engine Machinist Forum:

Eccentric

Well-Known Member
HMEM Supporting Member
Joined
Dec 29, 2020
Messages
311
Reaction score
692
Location
Southern California
3D Model Complete

I feel that the 3D model of the Offenhauser 97 cu in. Mighty Midget is complete enough to take it to the next stage and start building the prototype. Including the hardware, there are 86 different part types in the model and over 300 individual parts.
1644455913286.png



I have 3D printed a few of the major components to get a sense of scale.
1644455929727.png


The gear tower is pretty small and has very intricate details.
1644455946399.png



I am going to machine the crankcase top first. Working on the mill, I square up the work piece and drill 4 holes as entry points for the 1/4" flat end mill that will rough out most of the inside material.

1644455974883.png


I create the tool paths in Fusion 360 then output G-code for the LinuxCNC router.
1644456000558.png


Then I start making chips.
1644456014736.png


I believe that this will wrap up this thread in the "Plans" section. I will start a new thread in the "Work in Progress" area to document the machining of the prototype. As I build the prototype, I will be feeding back what I learn into the 3D model and the drawings.

Thanks for tagging along,

Greg
GregsMachineShop.com
 

petertha

Well-Known Member
HMEM Supporting Member
Joined
Jun 24, 2010
Messages
1,991
Reaction score
627
Will be following the build!
Maybe I missed it or maybe my brain has been devoted to my own after-the-fact gear issues, but what is the plan to key the timing gears to the shafts once clocked in?
 

Attachments

  • SNAG-2022-02-11 9.29.53 PM.jpg
    SNAG-2022-02-11 9.29.53 PM.jpg
    64 KB · Views: 42

propclock

Engine builder, Blown V8 to wobbler, Love it all.
HMEM Supporting Member
Joined
Jan 24, 2012
Messages
225
Reaction score
66
Location
Crockett calif
Man that is small!! it is one thing to look at your cad drawings but with a real life block next to
a caliper. It really brings it in to reality. Too much like watch making for me. Perhaps 2x would be
big enough for these old eyes.
 
Top