для размещения заказа - guhring@guhring-tools.ru
Reaming Tools
Troubleshooting
Adapted cutting speed, an appropriate 1 Holes too large 2 Holes too small
feed rate and good cooling and lubricating
agents should always be a top priority for reaming reaming
reaming operations. A further point to dRiemibemnasion dRiemibemnasion
be considered is that the reamer always
follows the direction of the pre-drilled hole. desired desired
An exception is the machine bottoming Sdoimllmenasion dSiomllemnasion
reamer. Consequently reamers do not • Tool diameter too large • Reamer blunt. Does not cut, only
correct alignment errors of pre-drilled • Cutting speed/feed rate too high scrapes
holes. Errors between the spindle axis • Concentricity error of machine • Cutting speed/feed rate too low
and the axis of a pre-drilled hole can be spindle • Component is thin-walled, springs
adjusted with the aid of floating holders. • Bevel lead of tool too short/uneven back
The following fault finding chart will be • Cutting edge build up due to • Insufficient stock removal
found useful in tracing the cause of some excessive cutting speeds allowance, tool seizes in hole
common reaming problems. • Lubricating agent unsuitable, holes
Wording: too large due to lubrication
Desired dim. Required finish dimension • Axis shifting between tool and pre-
of bore hole, defined as drilled hole. Application of floating
max./min. dimension of holders
tolerance zone
Reaming dim. the finish dimension
reached in fact
„Bore hole“ The reached bore hole
after reaming
3 Conical hole malformation 4 Unsatisfactory surface 5 Misalignment of hole
finish
ddSeiomsllimerenadsion mFvleuirscsahalttiuzgnngms-ent
fFaelhslema • No/insufficient lubrication. Cutting • Pre-drilled hole misaligned
dimension edge build-up. • Concentricity bevel lead incorrect
• Tool knocks in spindle • Tool damaged, i. e. broken cutting
• Bevel lead incorrect edge
• Axis shifting between tool and pre-
• Material has a tendancy to cause
drilled hole. Application of floating build up on cutting edges.
holders
• Pre-machining inaccurate • Surface finish of pre-drilled hole
unsatisfactory
• Concentricity bevel lead incorrect
• Chip evacuation restricted
6 Hole has chatter marks 7 Reamer seizes and breaks 8 Feed scoring marks in hole
• Cutting edge build-up • Back taper incorrect • Worn cutting edges
• Grease content in coolant too low • Circular lands too wide • Crumbling on cutting edges
• Circular lands too wide • Pre-drilled hole is too small • Build up on cutting edges
• Stock removal allowance • Bevel lead blunt/ground unevenly
• Feed rate too high
insufficient
• Tool incorrectly clamped in tool
holder
• Machine spindle not concentric
guhring@guhring-tools.ru 67
www.guhring-tools.ru
