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Reaming tools
Special recommendations for reaming with machine reamers
Blind hole or through hole Stock removal allowance of the would be lost. In most cases this
Straight-fluted reamers are gene- pre-drilled hole leads to tool breakage. If the pre-
rally applied in blind holes as they, In the event of the stock removal tension has been taken from the
due to their cutting edge geometry, allowance of the pre-drilled hole tool, it requires re-adjusting and
evacuate the chips from the hole exceeding the standard stock re-grinding.
against the direction of the feed. remo-val allowance of 0.2 to 0.3 Positional accuracy of the hole
Spiral reamers are preferred for mm for reaming, a quick spiral A machine bottoming reamer
the application in through holes reamer or a machine bridge ream- often provides the best solution
because the spiral evacuates the er should be applied. It is possible when optimal positional accuracy
chips from the hole in direction of to machine a considerably larger is required, thanks to its special
the feed. stock removal allowance with chamfer lead the ‘wander’ of the
Interrupted holes these tools, however, they should tool is minimal. In addition, ma-
Spiral reamers are preferred for not be applied in blind holes due chine bottoming reamers are of-
the application in interrupted to the bevel lead length and the ten applied when the pre-drilled
holes because the cutting edge spiral angle. hole and the reamer are not on the
geometry, in comparison to Expanding reamers same axis (slight misalignment).
straight-fluted tools, possesses a Expanding reamers can only be
lesser tendency of grabbing on the expanded. Subsequently, if the re-
oblique hole. If the oblique hole is sulting measurement is too large
> 0.25 x D, spiral reamers can also it is not possible to turn the screw
be applied in blind holes. back as the pretension of the tool
Schematic depiction No distance between taper-
of expanding and of risk shaped set screw and taper hole.
of tool breakage when
re-turning set screw Nenn-
(excessive depiction)
Expanding angle for
enlargement, resulting from
tightening the set screw.
vergrerter
Un-screwing the set screw results in an
overstretching and a lasting gap, red marked
in the depiction. This leads to instability
because of structural deformation.
expectable tool breakage by
overstretching and un-screwing
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