87+ manual transmission destruction, rebuilding, discussion etc....
09-14-2018, 04:19 PM
#76
Nordschleife Master
Thread Starter
Broadcasting this periodically: If someone has used 87-88 LSD unit in good condition for sale (part number 92833205220), I'm interested in buying it.
09-18-2018, 03:29 PM
#79
Nordschleife Master
Thread Starter
09-22-2018, 06:14 PM
#81
I'm no expert, but isn't Brinell used for aluminum and Vickers used for steel, I think one is a ball test the other a point test. I could be wrong...
09-22-2018, 10:45 PM
#82
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__________________
greg brown
714 879 9072
GregBBRD@aol.com
Semi-retired, as of Feb 1, 2023.
The days of free technical advice are over.
Free consultations will no longer be available.
Will still be in the shop, isolated and exclusively working on project cars, developmental work and products, engines and transmissions.
Have fun with your 928's people!
greg brown
714 879 9072
GregBBRD@aol.com
Semi-retired, as of Feb 1, 2023.
The days of free technical advice are over.
Free consultations will no longer be available.
Will still be in the shop, isolated and exclusively working on project cars, developmental work and products, engines and transmissions.
Have fun with your 928's people!
09-23-2018, 12:32 AM
#83
Nordschleife Master
Thread Starter
09-23-2018, 01:04 PM
#84
Nordschleife Master
09-29-2018, 06:29 PM
#86
Nordschleife Master
Thread Starter
"For instance when hardness is checked on a mounted tooth sample, it is typically checked by taking a microhardness traverse. The microhardness is taken either by Knoop, a method using a 500- or 1000-gram load, or sometimes Vickers, using a kg load. Yet nearly all drawings specify surface and core hardness in values of Rockwell "C", a method which uses a 150 kg load. For this reason, a conversion must be made from either the Knoop number or the Vickers number to determine whether the part met the specified Rockwell number. Conversion is not simply a mathematical relationship. Since the structure and cold working properties vary for different materials and hardnesses, The 150kg load used for a Rockwell "C" check is inappropriate to check the hardness close to the surface or elsewhere in the case. This is because the size of the indention made by the 150 kg load homogenize the conditions over a large area. This can mask local deficiencies."
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Mpfaff (06-27-2019)
09-30-2018, 01:37 AM
#87
Archive Gatekeeper
Rennlist Member
Rennlist Member
Greg has a Rockwell hardness tester on a stable table at the shop, but I've never seen him use it on a gear. Not sure which sets of indenters he has nor which sets of hardness scales it can be set up to measure.
09-30-2018, 09:33 AM
#88
Nordschleife Master
Thread Starter
John Kuhn had some gears measured at a lab, which used Knoop method. The Knoop method is local enough to be useful for gears, while Rockwell C test is not as useful. What's confusing is that the reference values are often quoted in HRC even though they aren't measured with that method.
10-10-2018, 04:46 PM
#90
