Tread Wear Measurement System (CTWIST) Tire designers are challenged to develop new tread patterns and compounds that deliver longer tread life and more uniformtread wear. Starrett-Bytewise partnered with Ford Motor Company and several leading OEM tire makers to developCTWIST as a way to measure and characterize tread wear so the designers could better understand wear behavior . With the CTWIST process, new tires are scanned after break-in, then periodically scanned during the wear cycles . CTWIST predicts the tread life for each rib, and produces several tread wear reports to help the designer understandwhere improvements are needed. CTWIST utilizes a non-contacting high-speed laser sensor to collect about 1,000,000 measuring points in less than 5 minutes. Fea tures • Tread Depth Profile Report shows the tread depth profile for each wear cycle • Heel/Toe Wear Report shows the heel-toe wear profile across the tread • IrregularWearReportshowsa3Dcolormapofthetreadloss • TreadLossReportshowsthetreadlossprofileacrossthetread • Tread Life Mileage Projection shows the predicted tread life of each rib System Specifications Typical Measurement Time 5 minutes Measurement Technology Scanned Laser Triangulation Measurement Range 32mm Laser Standoff 180mm Measurement Spot Diameter 0.1mm Laser Classification Class lllb Gallium Arsenide Laser Resolution < 0.008mm Data Signal Digital with Invalid Data Signal Data Points per Scan Line 4096 Senor Frequency 16kHz Encoder = 16,000 PPR Typical Data File Size 1Mb Compatible Tire Radius Range 200 to 625mm Compatible Tire Widths Up to 400mm MaximumTire andWheelAssemblyWeight 100kg Maximum Tire Rotation Speed 120RPM Machine Dimensions (W x D x H) 1000 x 1150 x 900mm Tread Wear Measurement System 547 starrett.com L aser M easurement