Tons of material available for removal.  Original thickness is 7mm and despite the grooves, that’s what it still is.  Minimum thickness is 6mm.  So lots of room.  By all accounts though it should probably be ground on something like a flywheel grinder.  Apparently, because of the hardness of the stainless steel, a lathe can tend to chatter, and the tools must be really sharp and won’t stay sharp very long. 

In any case, I have a new aftermarket rotor en route.

  March 26th, 1977, Hall and Oates score their 1st of 6 Billboard #1 hits, with "Rich Girl".

https://www.youtube.com/watch?v=MJsloJmMbis   Live at TopPop Studios, The Netherlands, 1977.


Weekly charts
Chart (1977)   Peak
position
Australia (Kent Music Report)[10]   6
Canada RPM Top Singles   5
Canada RPM Adult Contemporary [11]   45
Netherlands (Dutch Top 40)[12]   18
Netherlands (Single Top 100)[13]   15
New Zealand (Recorded Music NZ)[14]   33
US Billboard Hot 100[15]   1
US Hot Soul Singles (Billboard)[16]   64
US Radio & Records CHR/Pop Airplay Chart[17]   1


Certifications
Region   Certification   Certified units/sales
Denmark (IFPI Danmark)[21]   Gold   45,000‡
New Zealand (RMNZ)[22]   3× Platinum   90,000‡
United Kingdom (BPI)[23]   Platinum   600,000‡
United States (RIAA)[24]   Gold   1,000,000^

This was the best song in 1992.


https://www.youtube.com/watch?v=U3sMjm9Eloo

Was the rotor worn below the acceptable limit?  I've never found one that was worn that badly.

When I get the new rotor installed, and weather permits a ride, I’ll be able to report differences, if any, in braking performance between old and new.

Posted this in another thread as well:

Damn the torpedos.  I did a bit of reading about resurfacing these rotors.  It seems you only get about 20 thou to remove from each side.  And because of the hard stainless material, it’s recommended to grind rather than turn.  So I bit the bullet and ordered a new rotor.  Could have saved some $ by ordering through the US and shipping to a US address.  But considering current border issues, the ship $ saved wouldn’t be worth the hassle.  And I’ll have it in hand from the Ontario supplier early next week.

Damn the torpedos.  I did a bit of reading about resurfacing these rotors.  It seems you only get about 20 thou to remove from each side.  And because of the hard stainless material, it’s recommended to grind rather than turn.  So I bit the bullet and ordered a new rotor.  Could have saved some $ by ordering through the US and shipping to a US address.  But considering current border issues, the ship $ saved wouldn’t be worth the hassle.  And I’ll have it in hand from the Ontario supplier early next week. 

I have sandblasted rotors before. It helps on the grip side.

This Toronto group has been around for many years.  They won in 1989.


https://www.youtube.com/watch?v=hkMaBy6EX0w

  RIP to Rough Trade   Co-founder Kevan Staples. March 23/25 age 74.

https://www.youtube.com/watch?v=PFwom4D3i4g&pp=ygULcm91Z2ggdHJhZGU%3D    High School Confidential