Looking to Tow a Crossover with my Evo

Nate@RAM said:
When lathing a part, it HAS to be balanced. The process automatically balances the part as it's made. ...
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This is not true. The lathe only touches the perimeter of the part that is being machined. The material thickness and internal structure have a greater impact on balance than the perimeter profile.

Observe; Parts that cannot be balanced on a lathe:

Internal weight saving cavities unevenly distributed.
View attachment 236605

Inconsistent material thickness.
View attachment 236609
 
tchuck said:
This is not true. The lathe only touches the perimeter of the part that is being machined. The material thickness and internal structure have a greater impact on balance than the perimeter profile.

Observe; Parts that cannot be balanced on a lathe:

Internal weight saving cavities unevenly distributed.
View attachment 236612

Inconsistent material thickness.
View attachment 236614
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Please don't argue just to argue. The lathe is used to do the perimeter as well as the interior. The milling was designed so that each pocket is equally spaced and equally sized. The sum of the mass is balanced as a result. I will also be sending these out to be tolerance tested before they get sent out to you guys. But I'm 99.5% sure they're going to be perfectly balanced based on the design. If for whatever reason, they're not, we'll balance them before selling them.
 
Are there holes in the light weight pulleys? The holes could throw off a balance like you wouldn't believe. I understand this isn't your first walk in the park, but if an aftermarket pulley is not perfectly balanced, the negatives outweigh the positives when replacing the stock piece.

I had a CNR pulley on my FX35 (anybody remember that fiasco?) and long story short, it was a horrible experience. Just bad for me and absolutely horrid for others on this very forum.

I would just like to make sure you do not follow in their footsteps.
 
Nate@RAM said:
Please don't argue just to argue. The lathe is used to do the perimeter as well as the interior. The milling was designed so that each pocket is equally spaced and equally sized. The sum of the mass is balanced as a result. I will also be sending these out to be tolerance tested before they get sent out to you guys. But I'm 99.5% sure they're going to be perfectly balanced based on the design. If for whatever reason, they're not, we'll balance them before selling them.
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My point was to correct the misinformation you posted for the members who may not know what a lathe is and what it does, not to argue with you for fun. The six trapezoidal interior cavities shown in the pic below are not made on a lathe, they are made on a mill, and neither machine automatically balances anything. Not only that but the "pockets" in the model below clearly aren't even equally sized, which makes Frank's question about how exactly you balance them dually valid.

RAMVQ35-2.jpg
 

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Hey Nate,

Do you have details on the grounding kit for our FX? What points does it hit and also cost shipped to 10312?

I'm getting bored, need to turn some wrenches :tongue (2):
 
Frankiago said:
Are there holes in the light weight pulleys? The holes could throw off a balance like you wouldn't believe. I understand this isn't your first walk in the park, but if an aftermarket pulley is not perfectly balanced, the negatives outweigh the positives when replacing the stock piece.

I had a CNR pulley on my FX35 (anybody remember that fiasco?) and long story short, it was a horrible experience. Just bad for me and absolutely horrid for others on this very forum.

I would just like to make sure you do not follow in their footsteps.
Click to expand...

CNR makes me cringe. Tony had one of their pulleys on his Z if memory serves. Needless to say, they made some HUGE design flaws.

I'd have to get into some deep physics in order to explain how you can have evenly distributed masses of multiple quantities and still have a balanced rotating mass. I could bust out the calculus and calculate the moment of inertia for every point on the pulley and show how it has a counterpoint opposite of it, but that's way too much. I'll just get a shop to verify balance and leave it at that.

A quick and dirty caveat. If there were unevenly spaced pockets on the pulley, then there would be room for serious concern. The thing would wobble like a bent wheel. Since they're evenly spaced, it works out the kinks.


As for the FX grounding kit. It's $110 for the FX35 and $120 for the FX45.
 
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