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Source for the Cup washers on the SU Air cleaner Wing Bolts


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Had a chance last night to go through the process and take pictures for posterity.

Won’t be taking them in for plating any time soon. 

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Get ready

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Use a little bushing I made to center. 

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Squish!

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Cup made

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Turn die over, put cup underneath and squish the wings flat. Makes the machining steps easier

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Part two.

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Use die to drill 21/64 hole

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Install on custom mandrel on the lathe and remove excess.

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Parted off to right length. Quick sand paper polish while it’s spinning. 

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Flash clean up on the inner edge of the parted cut complete. 

 

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Final stage, a bit of dremel work to clean up any burrs and rough edges. 

Scratches on the back side need to smoothed from contact area on the mandrel. Quick abrasive rub, then sandblast for consistent finish. Off to plating with the next batch of hardware. Hopefully not too far in the future....

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Edited by zKars
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Awesome. When you said you were going to cut off the excess material on the lathe, I was going to suggest trepanning. I suspected that if you tried a traditional outside edge cut, there was no way you were going to be able to do that mounted on a mandrel like that. The interrupted cut would have made that impossible. Either the part would spin on the mandrel or the corners would have just bent over. Seems you're a step ahead of me!

Looks great!

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21 minutes ago, psdenno said:

At a reasonable $100 an hour......only $4,000 per washer.  Any price break if I buy a pack of six?  ?

Given the tough position so many of us are probably in or going to be in soon, you can have 6 for $4k. Canadian. 

Good news is I’ll lots of time to make plenty. Got a big sheet of 18 gauge to gobble up.

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  • 3 weeks later...

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