title: Optical activities in industry.
abstract: When making a very flat highly polished chopper wheel of stainless steel polished on both sides, we-and many others-find that it warps like a potato chip if such a chopper is polished one side at a time. Our solution is to lap and polish both sides at the same time so that stock removal is bilateral and warping from one side to the other is precluded.
authors.forename: F
authors.initials: F
authors.lastname: Cooke