Possible Causes – Unequal chamfers, Incorrect margins, Excessive spindle runout, Chatter
Possible Solutions – Regrind reamer with equal chamfer angle. Regrind reamer with narrow margins for reaming lower tensile materials. Increase reamer back taper (will lose size faster). Reduce speed and increase feed rate. Use power feed unless material is hard. Use right or left spiral fluted reamer. Grind secondary lead angle immediately back of 45° chamfer.
Possible Causes – Misalignment, Insufficient, cutting action
Possible Solutions – Use bushing – .0002″/.0003″ over reamer diameter. If hole location varies, use floating reamer holder. Increase reamer back taper (will lose size faster). Specify reamer with positive radial rake to reduce cutting pressure – may produce slightly larger diameter holes.
Possible Causes – Insufficient stock for removal, Excessive reaming pressure, Misalignment
Possible Solutions – Decrease previous operation drill size to allow more material for removal by reamer – leave about 3% of hole diameter for cast iron and more stock for non-ferrous materials. Increase feed rate. Reduce stock to be removed by increasing previous operation drill size – leave about 3% of the hole diameter. See Problem #2
Possible Causes – Not drilled straight
Possible Solutions – Correct previous drilling operation – reamer will follow the drilled hole. Increase reamer attack angle (chamfer) to 120°/180° included angle.