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U Drill
Spade Drill
Crown Drill bit
U drill is also called fast drill bit or quick violence u-drill cutter, is a kind of drill with internal coolant hole, row Cutting, high efficiency, can be continuous drilling. The front end of the insert is replaceable, which reduces the cost of use.
The difference between U drill and ordinary drill is that U drill uses the insert ----- peripheral insert and center insert, and the insert can be replaced directly after the tool is worn without re-grinding. The use of indexable insert saves material than the solid drill, and the consistency of the insert makes it easier to control the hole size. The rigidity of U drill is good, you can use a high feed rate, and the processing diameter of U drill is much larger than that of ordinary drill bits, which can reach diameter 50~60mm
| Feature Dimension | U-Drill (Indexable Drill) | Spade Drill | Crown Drill |
|---|---|---|---|
| One-sentence Positioning | The "high-speed sprinter" for shallow holes | The "precision stabilizer" for deep holes | The "all-rounder" for high-end applications |
| Core Advantages | Extremely high efficiency: Cutting speeds can reach 1500–3000 RPM, several times faster than ordinary drills. Very low cost: Indexable inserts are replaceable, with a single insert costing around $3–6 USD. | Strong deep-hole capability: Can reliably machine deep holes with a length-to-diameter (L/D) ratio of 5× to 30×. High precision: Hole tolerance down to ±0.05 mm and surface finish up to Ra 1.6. | Balanced performance: Combines relatively high efficiency with good precision, achieving tolerances of IT9–IT10. Replaceable heads eliminate regrinding and tool-setting time. |
| Main Limitations | Limited hole depth: Typically only suitable for shallow holes with an L/D ratio of 2× to 5×. High machine requirements: Requires rigid CNC equipment; not suitable for traditional radial arm drills. | Lower cutting speed: Typically runs at 20–40 m/min; less efficient than U-drills. Higher blade cost (approx. $30 USD per blade). | L/D ratio <15D Higher cost: Heads are often imported and can cost more than twice that of a spade drill blade. |
| Ideal Applications | High-volume, shallow-hole machining, such as standard holes in automotive parts and aerospace components. Can drill directly into surfaces with inclinations up to 30°, and handle complex conditions like stepped holes and intersecting holes. | Deep-hole, high-precision machining, such as ejector pin holes in molds, hydraulic valve body holes, and as an alternative when machine rigidity is low (e.g., radial arm drills, pillar drills). | Difficult-to-machine materials and critical holes, such as stainless steel, titanium alloys, and superalloys. Suitable for applications requiring high surface finish and consistent dimensional accuracy, or for counterboring bolt clearance holes. |
Contact: Luoxu
Phone: +86-13438285256
E-mail: Sales@mightools.com
Whatsapp:+86-13438285256
Add: 7F,No.2,Tongfu Alley,Xiyulong ST.,Chengdu 610015,China
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