The Crowning Touch in Roll Grinding

A basic, relatively inexpensive device for grinding calender rolls in place, instead of removing them for servicing off-site, has a new feature that allows it to “crown” the rolls.

A basic, relatively inexpensive device for grinding calender rolls in place, instead of removing them for servicing off-site, has a new feature that allows it to “crown” the rolls. Crowning tapers the rolls slightly so that each end is 0.005 in. smaller in diameter than the middle. This prevents formation of a center gap between two rolls under pressure. Roll Grinding Solutions Inc. in Worcester, Mass., has built its In-Place Portable Roll Grinders for 20 years, but developed the crown attachment as an option late last year. Crowning attachments can remove 0.005 to 0.040 in. from each end of a roll. The basic grinder costs $17,000; the crown option adds another $6000.