WORK OUT OF ROUND (THROUGHFEED) Work centreline too low. Set work centreline ½ of its diameter above wheel centreline, but on work 1" in diameter or above never exceed ½". Stock removal too heavy on roughing cuts. Make first cut light at high traverse rate to attain maximum straightening effect. Then use heavier cuts and finish with a light cut. Insufficient passes on hardened work. Increase number of passes. Wheel grade too hard. Increase traverse or infeed rate to make wheel act softer. Or use a softer grade wheel—consult your grinding wheel manufacturer’s representative for specific particulars. Insufficient coolant when grinding tubing or other hollow work such as pistons, etc Increase flow of coolant at point of contact. Grinding pressures too high. Especially on tubing, pistons, etc. Dress wheel more open with a sharp diamond and more rapid traverse. Regulating wheel speed too slow. Increase regulating wheel speed. Regulating wheel loose on spindle or mount. Tighten spindle nut and collet screws Loose spindle or regulating wheel bearings. Adjust bearings.  Angle on work blade too low Gradually increase blade angle until right Loose or tight regulating wheel chain will cause periodic or intermittent flats on work piece. Remove or add links from or to chain until setting is correct. Irregular flats on infeed work pieces when work left between wheels too long. Eject work pieces as soon after sizing as possible. Flats on in feed work caused by ejector ‘cocking work into grinding wheel. Eliminate cause of side strain on ejector mechanism. Flats on throughfeed work caused when it stops rotating between wheels. Dress wheels correctly, and, if necessary, increase inclination angle of regulating wheel spindle so work feeds all the way out.