Knowledge
Reaming
Troubleshooting

Troubleshooting for reaming

Main problems

Spindle or tool run-out is too high
Wrong cutting data
Built-up edge

When solving a problem:

Look at the whole system (tool, clamping, spindle, coolant, etc.)
Always change only one parameter at a time


Oversized bore Size of the tool diameter is too high Cutting speed/feed is too high Spindle or tool run-out is not good Cutting chamfer is too short or varying Built-up edge Oil percentage in coolant is too high Pre-drilled hole not aligned to reamer

Undersized bore Tool with high wear Cutting speed/feed is too low Thin-walled workpiece Workpiece springs back after machining Allowance for reaming is too small

Tapered bore Spindle or tool run-out is not good Failure on the cutting chamfer Pre-drilled hole not aligned to reamer Inaccurate pilot bore

Bad surface finish bore No or not enough coolant resulting in built-up edge Poor chip removal Material bends resulting in built-up edge Poor surface in the pilot bore Bad run-out of the cutting chamfer Cutting speed/feed is too high Damaged tool, for example broken cutting edge

Wrong position of the bore Position of the pilot bore is wrong Bad run-out of the cutting chamfer

Bore is convex or oval Workpiece is not stable in the clamping fixture

Chattermarks in the bore Built-up edge Oil percentage in the coolant is too low Circular land is too wide Allowance for reaming is too small Tool is wrongly clamped in the holder (not strong enough, not straight, for example) Bad spindle run-out Feed is too low

Tool clamps and breakage Back taper is too small Circular land is too wide Pilot bore is too small Cutting chamfer with high or unequal wear Feed is too high Problems with chips

Feed grooves in bore Tool with high wear Broken cutting edge Build up on the cutting edges

Chip removal problems Cutting speed/feed is too high or too low Incorrect coolant pressure Check if the right reamer is used Spiral flute for through hole Straight flute for blind hole