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Reamers take off material at the circumference of the cylindrical bore hole. This happens when they are turned with the help of a tap wrench with little pressure from above in clockwise direction in the bore hole.
Figure 8 - Reaming
In doing so, lubricating and cooling agents roust be fed.
Straight and spiral-fluted reamers cannot carry off any chips during the process, the chips remain in the chip grooves filling them after a short time.
Conclusion:Especially with longer bores, reamers must be taken out and cleaned during the reaming process, otherwise they will become jammed and break.
Why must reamers - after the process has begun - not be turned in reverse (anticlockwise) direction?
Figure 9 - Chipping of the cutting
edge when turning the reamer in reverse direction
1 - Workpiece,
2 - Cutting edge,
3 - Chips
With spiral-fluted reamers - in contrast to the drill - the hand of the helix is opposite to the direction of rotation (sole exception: the structural reamer) in order to prevent the reamer from being drawn into the bore.
Such reamers are used, if there are pockets or grooves in the bore (feather or oil grooves).
Figure 10 - Spiral-fluted reamer
applied to a bore hole with feather groove
What happens, if with reaming a bore with feather groove a
straight-fluted reamer is
used?
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