ASM2 Gearbox Failure
Discussion
I found an interesting article on Shot Peening that summarises this shambles quite well
Shot Peening causes the material in the surface zone to yield by literally shaking the metal grains into a more relaxed state. As a result, the surface layer counteracts tensile stress and effectively prevents cracking. Blast Finishing and shot peening are state-of-the art technology that deburr, clean and enhance appearance. Shot peening can even improve the fatigue life of parts such as: gears, housings and shafts.
What are the benefits of shot peening?
Machining and forming metal parts creates stress concentrations internally (burns, scratches, welds, etc.) and can cause other additional defects.
These problems may be responsible for premature fatigue failure, porosity, deteriorated strength and corrosion, but can be prevented with shot peening.
Since fatigue cracks generally begin at surface imperfections, a compressively stressed peened skin is highly effective in preventing crack formation and growth.
Hence this!
20140619_082239 by mikey k V8VR, on Flickr
All to save a few hundred pounds/make more margin at the point of sale, I wonder how much it will cost with warranty claims for replacement gearboxes? Especially as AM buy them in
Shot Peening causes the material in the surface zone to yield by literally shaking the metal grains into a more relaxed state. As a result, the surface layer counteracts tensile stress and effectively prevents cracking. Blast Finishing and shot peening are state-of-the art technology that deburr, clean and enhance appearance. Shot peening can even improve the fatigue life of parts such as: gears, housings and shafts.
What are the benefits of shot peening?
Machining and forming metal parts creates stress concentrations internally (burns, scratches, welds, etc.) and can cause other additional defects.
These problems may be responsible for premature fatigue failure, porosity, deteriorated strength and corrosion, but can be prevented with shot peening.
Since fatigue cracks generally begin at surface imperfections, a compressively stressed peened skin is highly effective in preventing crack formation and growth.
Hence this!
20140619_082239 by mikey k V8VR, on FlickrAll to save a few hundred pounds/make more margin at the point of sale, I wonder how much it will cost with warranty claims for replacement gearboxes? Especially as AM buy them in
Edited by mikey k on Friday 4th July 09:51
My understanding is AM have no IP rights on the box as it is also sold to Ferarri and Maserati in far more developed forms
Legalities and contractual obligations aside the ethos and ethics of how AM dealt with this is does not encourage loyalty
BTW Johnny has done 300 miles today roof up NVH is dramatically lower so much so I'm hearing tyre noise from cars and getting just under 30 mpg at 80 mph and cruise on - astounding!
Legalities and contractual obligations aside the ethos and ethics of how AM dealt with this is does not encourage loyalty
BTW Johnny has done 300 miles today roof up NVH is dramatically lower so much so I'm hearing tyre noise from cars and getting just under 30 mpg at 80 mph and cruise on - astounding!
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