Drill Bits Straightening Machine Testing
Before a straightening machine is proposed, it is tested on the customer workpiece. This page documents the test for drill bits of 6 mm thickness and 120 mm length with a 0.2 mm straightness requirement, run on the AMS-300S drill bits straightening machine. The photos and the testing video below are from the actual run.
Test Parameters
Drill bits size: 6 mm thickness and 120 mm length; 0.2 mm straightness is required.
Drill bits size: 6mm thickness and 120mm length; 0.2mm straightness is required
The Machine: AMS-300S
AMS-300S drill bits straightening machine: suitable for the drill bits with 3-8 mm diameter and 300 mm maximum length. The machine measures the runout of each bit, presses at the calculated points and re-measures until every point meets the tolerance set on the control panel.
What the Test Verifies
A test on sample parts answers three questions that a specification sheet cannot. First, capability: does the machine reach 0.2 mm on this exact geometry, with its flute, shank and heat-treatment condition? Second, repeatability: does the result hold across a batch of bits with different incoming bend patterns, rather than only on the easiest part? Third, cycle time: how long does a bit actually take from loading to verified result, which is the number that determines whether the machine matches the line it will feed.
The measurement method is part of the answer. The bits are rotated while sensors scan the runout profile, so the bend map covers the full circumference instead of a single direction an operator happened to sight. The press then corrects the measured bend, not an assumed one, and the post-check on the same measurement chain confirms the result with the same instrument that demanded the correction. For how to structure such a test before committing to a machine, see sample test acceptance for straightening machines; a worked drill bit example with customer parts is in the drill bit straightening case study for Korean customers.
Reading the Before-and-After Data
The useful output of a test like this one is not a single pass or fail but the distribution: how many bits reached 0.2 mm on the first pressing cycle, how many needed a second, and whether any part refused to converge. A healthy distribution concentrates in the first cycle, which means the press force and the measurement are matched to the workpiece. If a meaningful share of parts needs multiple cycles, the machine settings need revisiting before the tolerance is blamed, because a repeated light press and a single heavy press deliver very different residual stress and surface condition.
The after-measurement also documents where on the bit the residual runout sits. A bit that reads 0.18 mm overall but concentrates that deviation at the tip behaves differently in wood from one that spreads the same figure along the shank, and the flute geometry makes the tip the more sensitive location. This is why the recorded profile, not only the headline number, is worth reviewing when a straightening test is evaluated, and why we keep the measurement data together with the video from tests like the one on this page.
Machine Testing Video
Machine testing video is as bellow:
Related Pages
Drill bits and similar drilling tools are covered across several pages on this site: the tooling family overview at tool straightening solutions, the drilling-specific process background at drilling tools straightening, and a related workpiece walkthrough for extension bars at straightening drill bit extension bars.
More information about the straightening machine, please visit our website:
www.straighteningmachinery.com
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