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-   Porsche 911 Technical Forum (http://forums.pelicanparts.com/porsche-911-technical-forum/)
-   -   Checking condition of used Fuchs (http://forums.pelicanparts.com/porsche-911-technical-forum/528168-checking-condition-used-fuchs.html)

Wilhelm 02-25-2010 08:24 PM
Thanks Flieger, Diamondblue, and island911 for the price info . I should have done more "Googling".

Ach du Lieber ! My assumptions about the price of new Fuchs has been confirmed. When I am ready to buy, I will find a good set of used wheels - that have been carefully inspected - from Weidmann or Al Reed. A used set plus the inspection/x-ray certainly must be less expensive than the new ones.

911pcars 02-25-2010 11:09 PM
Quote:
Originally Posted by island911 (Post 5205245)
Well, my post was to mostly correct the misinformation. As to production vs one-off parts... first; wheels are not generally "one off." Second, wheels have symmetry. --this means a single Fuchs (5-spoke) could be tested, turned 72°, retested . .. turned 72°, retested . .. turned 72°, retested. With each test compared to each other. --they should all appear the same.
Unless someone here is mass-producing factory Fuchs, tell me who has such a setup as shown in the video for testing used wheels I buy from a private party?

Sherwood

Flieger 02-25-2010 11:54 PM
You know when I first saw that Magnaflux Quasar machine I could only think of this.:D

<object width="640" height="505"><param name="movie" value="http://www.youtube.com/v/RXJKdh1KZ0w&hl=en_US&fs=1&"></param><param name="allowFullScreen" value="true"></param><param name="allowscriptaccess" value="always"></param><embed src="http://www.youtube.com/v/RXJKdh1KZ0w&hl=en_US&fs=1&" type="application/x-shockwave-flash" allowscriptaccess="always" allowfullscreen="true" width="640" height="505"></embed></object>

T77911S 02-26-2010 03:40 AM
Quote:
Originally Posted by 911pcars (Post 5205126)
"i have always heard that fuchs bend before they break, IE, no cracks."

On occasion, they crack. Some photos in the archives confirm that.

Magnaflux is a trade name for crack-testing ferrous metals. The company also has a process for testing non-ferrous materials. Apparently, they also own the Zyglo trade name (flourescent dye test).

If your application requires the utmost safety, I'd test.

If you're buying used wheels for your street car, it's up to you. A close physical inspection along with one of many crack-testing kits might be prudent.

Sherwood
will they break? i have never seen any info on fuchs, just what people say.

island911 02-26-2010 07:14 AM
Quote:
Originally Posted by 911pcars (Post 5206403)
Unless someone here is mass-producing factory Fuchs, tell me who has such a setup as shown in the video for testing used wheels I buy from a private party?

Sherwood
wth is with the attitude? I never suggested that people go get their used wheels magnufluxed. I was just saying that it could be done. I was simply giving a response to when you and another gave misleading technical information.

...ah, I corrected you - that's why you have a hair up your ass. (squirm squirm)

James Brown 02-26-2010 07:34 AM
Most NDT is something left for a tech to do regardless of what method. A quick check with a 10x glass should be fine. And if you find something questionable, take it to an aircraft mechanic at a nearby airport to have them check it out. That should be the quickest and cheapest route

island911 02-26-2010 07:40 AM
+1

For a forged wheel, signs of fatigue will show at the surface first.

B D 02-26-2010 08:31 AM
Quote:
Originally Posted by island911 (Post 5205193)
Not true. Aluminum affects a magnetic field.

<object width="425" height="344"><param name="movie" value="http://www.youtube.com/v/AoPqtZv5AoQ&hl=en_US&fs=1&"></param><param name="allowFullScreen" value="true"></param><param name="allowscriptaccess" value="always"></param><embed src="http://www.youtube.com/v/AoPqtZv5AoQ&hl=en_US&fs=1&" type="application/x-shockwave-flash" allowscriptaccess="always" allowfullscreen="true" width="425" height="344"></embed></object>
What? This is a video of resonant inspection no magnetic field needed.

An eddy test works on aluminum and is very common in wheel repair and also to test scuba tanks.

island911 02-26-2010 09:13 AM
My bad ... shouldn't have used the term "magnaflux" so loosely. (like xerox, Kleenex) the video (a Magnaflux inspection product) isn't using magnetics.

...but, point being, as you say, (magnetic) eddy currents work for Aluminum. (which was my original point)

Flieger 02-26-2010 02:01 PM
OK, we all agree that Aluminum is affected by a magnetic field but has less coupling than does ferrous metal. Eddy currents work to some degree or another on both.

This means that magnetic dye can be used to find those eddy currents along cracks provided the field is strong enough to make it visible.

James Brown 02-26-2010 02:15 PM
(insert icon of dead horse here)


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