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The Dormer A120 Metric HSS Stub Drill Bits (4.00mm) are designed for professionals performing general machining tasks. They offer easy starting and accurate hole placement, ideal for use in portable drills, turrets, and automatic lathes. A key benefit is the special split-point design which prevents wandering. One caveat is that these are specialized bits and may not be suitable for all materials or heavy-duty industrial applications without proper setup.
| Model Part Number | 5063750581507 |
|---|---|
| Brand | DORMER |
The split-point design provides excellent self-centering, allowing the drill bit to start accurately on the material surface without the need for a center punch, and it significantly reduces the tendency for the bit to 'walk' or wander.
These drill bits are designed for general machining applications and are suitable for materials such as mild steel, aluminum, brass, and plastics. For very hard or exotic materials, specialized drill bits may be required.
The stub length makes the drill bit more rigid and less prone to deflection or bending compared to standard length bits. This is particularly advantageous when used in portable drills or when drilling deeper holes where chatter can be an issue.
No, these are drill bits designed for creating holes. For precision hole sizing or finishing, reaming tools are required.
Keep the drill bits clean and dry after use. Store them properly in a bit holder to protect the cutting edges. Sharpening may be required after extensive use, but this should be done by a professional to maintain the split-point geometry.
The product code for the Dormer A120 Metric HSS Stub Drill Bits - 4.00mm is TK8140.
Ensure the split-point is sharp. If using very hard material or if wandering persists, a center punch mark may still be beneficial, or ensure the workpiece is securely clamped.
Ensure you are using appropriate drilling speeds and feed rates. Periodically retract the drill bit to clear chips from the hole. Consider using a cutting fluid.
Verify that the material being drilled is within the intended application range. Check that drilling speeds are not too high and that adequate cooling/lubrication is being used. Ensure the drill press or portable drill is stable and not wobbling.
Confirm the drill bit is the correct size (4.00mm). Ensure the drill chuck is not slipping and that the drill press or portable drill is running true without excessive runout.
Setup: Securely fasten the drill bit in the chuck of your drill, ensuring it is properly aligned. Use appropriate speeds and feed rates for the material being drilled. For harder materials, consider using a cutting lubricant.
Compatibility: These drill bits are compatible with standard drill chucks found on portable drills, turrets, and automatic lathes. They are designed for general machining applications and are best suited for materials like mild steel, aluminum, and plastics. Consult machining data for optimal speeds and feeds for specific materials.
Care: After use, clean the drill bit to remove any debris or coolant residue. Store the bits in a dry place, ideally in a bit holder, to prevent corrosion and damage to the cutting edges. Avoid dropping or mishandling to maintain the integrity of the split-point.
