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naumuk(at)alltel.net
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 Posted: Tue Oct 23, 2007 2:39 pm Post subject: Corvair Crank tap |
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All-
I seem to be SOL. Two of the tapped holes of my crank won't accept the hybrid studs, and I have to chase them.
Anyone know where to get an 11/32-24 tap?
Bill Naumuk
HDS Fuse/Corvair
Townville, Pa
[quote][b]
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leinad
Joined: 19 Sep 2006
Posts: 283
Location: Central Virginia
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| Posted: Tue Oct 23, 2007 4:54 pm Post subject: Re: Corvair Crank tap |
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Bill,
The way I did mine was to re-tap all the holes for standard 3/8 fine thread and then used standard AN hardware. I know this is contrary to William Wynne's recommendation as he says it's very difficult to get the holes straight when tapping but the way I solved that problem was to make a jig which is a round piece of aluminum with the same bolt pattern as the crank end, and a pilot that fit the crank end. The hole sizes in the jig were in pairs. Two were a snug fit on the 11/32 bolts. 2 were the size of the tap drill for the 3/8 fine thread. 2 were sized to guide the tap, a little smaller than 3/8. I bolted the jig on using 2 of the 11/32 bolts. And drilled out 2 holes the tap drill size for the 3/8 bolts. I unbolted the jig and turned it so that I could then tap the first 2 to 3/8 fine. After the first 2 holes I opened up the 11/32 holes in the jig to 3/8 and from there used 3/8 bolts to hold the jig. The jig has to be accurately drilled. I drilled mine on a milling machine and a rotary table.
It might even work to make the jig with all the holes one size if you can find bushings to size it down for various sizes required. But that idea was hind sight.
Dan
plans building 601XL
[quote="naumuk(at)alltel.net"]All-
I seem to be SOL. Two of the tapped holes of my crank won't accept the hybrid studs, and I have to chase them.
Anyone know where to get an 11/32-24 tap?
Bill Naumuk
HDS Fuse/Corvair
Townville, Pa
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Scratch building XL with Corvair Engine |
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Ron Lendon
Joined: 10 Jan 2006
Posts: 685
Location: Clinton Twp., MI
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naumuk(at)alltel.net
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| Posted: Wed Oct 24, 2007 1:59 pm Post subject: Corvair Crank tap |
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Ron-
Been there, done that. The lead-ins have to be cleared, and the bolts
aren't hard enough after the crank's been nitrided.
Bill Naumuk
HDS Fuse/Corvair
Townville, Pa
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