ABSTRACT
Directmeasurementoftherollgapwiththeworkpiecepresentintherollbiteisaproblemyettobe resolved.Currently,onlyindirectmethodsofrollgapmeasurementhavebeendeveloped.
Oneofthemostcommonmethodsinvolvesmeasuringtheactualthicknessoftherolledmaterialat theexitofamillstand.Amajordeficiencyofthismethodisthetimedelayduetothefactthatthethicknesssensorcannotbeeasilyinstalledclosetotherollbite.Thisdeficiencyiseliminatedbylocatingthe rollgapsensorsbetweentheworkrolls[9],asshowninFig.9.5.Inapplyingthismethod,however, anothererror,whichiscausedbyrollbending,isintroduced.Insomerollgapcontrolsystems[10,11],the sensorsareinstalledeitherbetweenthebackuprollchocks(Fig.9.6)orbetweenthebackuprollchocks andpartofthehousingpostcalleda"MaeWest"block.
