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Old 01-08-2009, 06:42 PM
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David Kirkham David Kirkham is offline
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Join Date: Mar 2001
Location: Provo, Ut
Cobra Make, Engine: Kirkham, 427
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Gents:

I am sorry to say, the education is about to continue.

When I measured the Trigo pins the first time, I just grabbed a simple protractor tool. They obviously did not have a 90 degree taper and 82 looked pretty close so I figured that is what it was.

Well, today I bused out the Mitutoyo angle gauge to check our pins as we made them...it wasn't pretty. Our pins are right on the money at 82 degrees, but I held the taper up to a Trigo taper and noticed it was slightly off...hmmm???

What gives?

Remeasured our pin...82 degrees. Remeasured the Trigo pin (this time with a proper angle gauge...76 degrees!!!!!!!



Let's see. Standard tapers in machining. 60, 82, 90, 100 and 120 degrees. NO 76 ANYWHERE I have ever seen.

Oh well. I'll wait to see what the adapter is actually machined to and then we will fix the pins. No big deal, but irritating, none the less.

Perhaps, (and only perhaps) this is why some people have had problems with the pins. Perhaps the taper of the pin doesn't match the taper of the hub adapter. If the tapers don't match, you will have very high point loading on the parts, exceed the yield of the material, and have a galling fest. Galling could very well cause the pins to tip and cause all sorts of grief.

David


ps. CNGreen
Better send me along the tracking number. Fed Ex didn't deliver today.
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David Kirkham, President Kirkham Motorsports
Manufacturer Aluminum Body Kit Cars and supplier to Shelby* for their CSX4000, CSX7000, and CSX8000 289 and 427 Cobra
*Kirkham Motorsports is not affiliated with Ford or Carroll Shelby or any of their trademarks.
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