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Blind hole or through hole Expanding reamers
Straight-fluted reamers are generally applied in blind holes Expanding reamers can only be expanded. Subsequently,
as they, due to their cutting edge geometry, evacuate the if the resulting measurement is too large it is not possible
chips from the hole against the direction of the feed. Spiral to turn the screw back as the pre-tension of the tool would
reamers are preferred for the application in through holes be lost. In most cases this leads to tool breakage. If the pre-
because the spiral evacuates the chips from the hole in di- tension has been taken from the tool, it requires re-adjus-
rection of the feed. ting and re-grinding.
Interrupted holes Positional accuracy of the hole
Spiral reamers are preferred for the application in inter- A machine bottoming reamer often provides the best solu-
rupted holes because the cutting edge geometry, in compa- tion when optimal positional accuracy is required, thanks
rison to straight-fluted tools, possesses a lesser tendency to its special chamfer lead the ‘wander’ of the tool is mi-
of grabbing on the oblique hole. If the oblique hole is > 0.25 nimal. In addition, machine bottoming reamers are often
x D, spiral reamers can also be applied in blind holes. applied when the pre-drilled hole and the reamer are not
on the same axis (slight misalignment).
Stock removal allowance of the pre-drilled hole
In the event of the stock removal allowance of the pre-drilled
hole exceeding the standard stock removal allowance of 0.2
to 0.3 mm for reaming, a quick spiral reamer or a stepped
machine reamers should be applied. It is possible to ma-
chine a considerably larger stock removal allowance with
these tools, however, they should not be applied in blind
holes due to the bevel lead length and the spiral angle.
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