Thread: Motor coupling
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Unread 23-06-2002, 23:35
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#0047 (ChiefDelphi)
  
Join Date: May 2001
Location: Pontiac, MI
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No, no, Anton... set screws inhale!
Posted by Andy Baker at 1/25/2001 7:34 AM EST


Engineer on team #45, TechnoKats, from Kokomo High School and Delphi Automotive Systems.


In Reply to: Re: Motor coupling
Posted by Anton Abaya on 1/24/2001 9:35 PM EST:



We just attached the coupling to the gearbox shaft yesterday.

By all means, don't use a set screw. As Woodie says... "set screws inhale audiably" (suck).

Here's what we did, and by the way, this operation was made by a machinist, since no coach or student on our team has ever had sucess doing this operation without buggering it up. So, if you want to do this, get a professional's help.

Put a 3/8" lock washer on the shaft, then thread the motor coupling on (yeah, the one provided by SPI). Screw it on until it bottoms out on the lock washer (lock washer holds it in place).

There is a 1/16" dia. pilot hole on the coupling... use a "spade drill" or a "carbide bit" to drill a pilot hole for a #8-32 screw, all the way through the coupling (this is hard to do).

Once your hole is drilled, use a titanium coated #8-32 tap... I think it's called "titankote" (or something like that)... to tap all the way through the coupling, with the shaft included. Take your time as you tap... don't break it or your gearbox is junk.

Then, put a #8-32 socket head cap screw in there, and voila, a killer coupling attachment.

No, the #8-32 screw is not too big, as long as you don't drill your pilot hole too big.

We used this procedure for the past three years. I think that we've only shattered three screws in the gearbox shaft during competition over the years.

Good luck, and be careful... like I said, get a pro to help you with this one!

Andy B.


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