Troubleshooting for reaming

Oversized bore

• Size of the tool diameter is too high
• Cutting speed/feed is too high
• Spindle or tool runout 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 runout 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

Chatter marks 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 clamped wrong 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
• Ensure the right reamer is used

• Spiral flute for through hole
• Straight flute for blind hole