Reamers
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Frequently asked questions
How much stock should be left before reaming?
Diametral stock is typically about 0.1 to 0.2 mm for holes under 10 mm and 0.2 to 0.3 mm for larger holes. Too little causes rubbing, work hardening and rapid wear; too much gives oversize holes and poor finish.
Does an H7 reamer guarantee an H7 hole?
An H7 reamer is ground so the hole falls within ISO 286 H7 under normal conditions. Some ductile materials close up and others cut oversize, so for critical fits gauge the first hole with a plug gauge.
How does reaming speed compare with drilling?
Reaming typically runs at about half to two thirds of the drilling cutting speed, with a higher feed than a drill of the same size. Too low a feed causes rubbing and chatter marks. Do not reverse the spindle when retracting, or the edges can chip.
How do I choose straight or spiral flute reamers?
Straight flutes are common for through holes and short-chipping materials such as cast iron. Left-hand spiral pushes chips forward for through holes; right-hand spiral lifts chips out, suiting blind holes and holes with keyways or cross holes.
Can reamers be reground?
The front chamfer of a reamer can be reground when the edges wear, but grinding the periphery reduces the diameter and loses the tolerance class. Reamers worn on the sizing section are therefore usually reclassified to another size or replaced. Recording the number of holes reamed shows when regrinding is due.
Why are reamed holes tapered or lobed?
Taper usually comes from the reamer being out of line with the drilled hole or from spindle runout. Three- or five-lobed holes appear when the reamer vibrates in the hole, often due to uneven stock or rigid holding when the pilot hole is off position. A floating holder or a more accurate pilot hole corrects this.
Does cutting fluid affect reamed hole size?
Yes, neat cutting oil usually gives a better finish and a slightly smaller hole than water-based fluid, because good lubrication reduces built-up edge. Changing fluid type or concentration can shift hole size by a few micrometres. Keep the fluid consistent when reaming tight-tolerance holes.
How do machine reamers differ from hand reamers?
Hand reamers have a long lead taper and a square end for a tap wrench, used for manual reaming or on-site repair. Machine reamers have a short chamfer and a straight or Morse taper shank for mounting on a machine at a steady feed. Do not mount hand reamers on machines, because the long taper does not suit machine cycles.
