Centreless Machine Tools - FAQ's
Our many years of experience refurbishing and servicing centreless machine tools gives us the ability to identify problems and make corrections that will improve your grinding process. Trouble shooting of a customer's problem can in many cases be identified by discussion on the telephone. We can advise the customers maintenance personnel or our engineers can visit to undertake on site repairs or adjustments of your centreless machine tools.
We have identified common problems below and given possible corrections and adjustments to carry out.
- Low ends on work
- Burn marks on workpiece
- Chatter
- Blunt diamond
- Erratic Sizing
- Incorrect surface finish
- Intermittent cut
- Low centre
- Out of round work
- Low ends on work
- Work guides deflected towards grinding wheel.
- Face of regulating wheel not straight at work contact point. (Truing slide worn or not set to correct angle.)
- Burn marks on workpiece
- Insufficient coolant on workpiece.
- Blunt diamond
- Wheel too hard
- Truing rate to grinding wheel too slow
- Chatter
- Work set too high above centre.
- Wheel out of balance
- Workblade too thin.
- Machine levelling screws not adjusted correctly.
- Glazed wheel caused by blunt diamond, too hard a wheel, grit size too fine, dressing speed too slow.
- Outside influences vibration from other machines etc.
- Grinding wheel motor out of balance.
- Grinding wheel mount loose on spindle.
- Too heavy stock removal.
- Workblade loose.
- Blunt diamond
- Diamond not turned periodically.
- Excessive cut when truing grinding wheel.
- Erratic Sizing
- Main slides worn or loose.
- Infeed screw and nut worn.
- Incorrect use of infeed lever
- Grinding wheel too soft
- Slides sticking.
- Workblade loose.
- Parts overheating.
- Regulating wheel camming.
- Too much variation on size of components.
- Incorrect surface finish
- Incorrect wheel grade.
- Dirty coolant.
- Setup incorrect.
- Truing speed too fast.
- Grinding wheel out of balance.
- Loose cracked or blunt diamond.
- Work too high above centre.
- Regulating wheel angle or R.P.M. too excessive.
- Intermittent cut
- Grinding wheel not trued correctly.
- Regulating wheel camming.
- Low centre
- Workguides deflected towards grinding wheel.
- Face of regulating wheel not straight at work contact point. (Truing slide worn or not set to correct angle.)
- Out of round work.
- Out of balance workpiece.
- Work not high enough above centre.
- Workpiece bowed.
- Regulating wheel not dressed correctly.
- Regulating wheel loose.
- Not enough stock on component.
- Regulating wheel too slow.
- Interrupted cut due to holes or keyways etc.
- Endstop or ejector worn.