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540i Swapped Rat rod Build thread


ThatRatRodProject

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25 minutes ago, RobZR said:

I would not recommend using a stripper bolt in this manner. They are not intended to handle lateral forces and have a inherent stress riser at the base of the thread that is prone to failure.

Ideally you would support both sides of the pivot point from the subframe.  if you must support it from one side a spool and bolt design will bend before failure, since it keeps the bolt in tension.

 

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I 100% agree with you. If you are using a Harden alloy shoulder bolt. But with that being said I will be mostly turning up a custom shoulder bolt . But any side load should be transferred to linear load with the thrust bearings. Not 100% transferred but lessened a great deal. I’m not saying you wrong in anyway and I will take any input I can. 

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8 minutes ago, Jdesign said:

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CAD to Metal overnight. I like your fast pace.

What did you use to cut the parts? Waterjet?

 

I work In a Tool Shop so i May have utilized Our CNC Laser.

I did have some of this work done Prior to posting the cad up date. 

Its been after hours progress the past 2 weeks . I have 3 of the 4 Control Arms done. So you should see up-dates later this week. 

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On 9/30/2019 at 4:49 PM, RobZR said:

 

spool-n-washer.jpg

With some help from RobZR. I believe we have reached a much safer option from using a shoulder bolt. I made up this spindle design last night. This will have a castle nut and cotter pin in its end form. I did tighten it all down and I’m very pleased with how it turned out. zero play. 

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Just now, B C said:

Great work man! You may also consider using oil impregnated solid thrust washers instead of roller bearing thrust washers if the loads are low enough and you want to improve environmental protection.

 

The castle nut is a great idea

I would like to possible try 3d Printing some bushings for weather protection. Out of some soft filament. Or Nylon 

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  • 1 month later...

Pulled the frame out from underneath the car and worked on getting the front end mounted to the frame. Holiday week is letting me get some shop time in. I’m just waiting on the rear wheels  From basset racing. and then I will have everything to make it a roller. Glad to see all me card board templates and napkin drawings are working out. 

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Today’s progress flipped the frame back over and set the body back on. Dropped the motor in and line up the drive line components. 

Up next motor mounts and rear sub frame modification. I have to finish weld the the front subframe. And waiting on rear wheel from bassets racing.  So I can start string lining gauging for. Rear sub Frame mounts.

 

 

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