If you are using or designing a deep hole trepanning drill bit, the following knowledge is essential and critical for optimal performance.  

1. How to Determine the Cutting Edge Width (B)?  

The cutting edge width determines the chip evacuation space, directly affecting whether chips can be removed smoothly. The width of the cutting teeth influences metal removal rates, power consumption, and the strength/rigidity of the tool body. Generally, a narrower cutting width is preferred, provided chip evacuation and tool rigidity are ensured. Larger diameters allow for wider cutting edges.  

For deep holes with high length-to-diameter ratios, consider the weight of the core bar and its pressure on the tool. If necessary, add rear guide pads or a central support pillar. For large-diameter, deep holes, an external chip evacuation design may be used.  

Formula for Cutting Width (B):  B=0.05d1+（3-6）mm 

(d1 = core bar diameter)

2. What Are the Structural Classifications of Deep Hole Trepanning Drill Tools?  

There are three main types:  

– Welded Solid Type: One-time use, limited regrinding, compact structure.  

– Indexable Insert Type: Replaceable inserts, but the tool body must be replaced if damaged.  

– Insert Holder Type: Long-lasting tool body; both inserts and holders are replaceable. Allows micro-adjustments for size but requires more installation space.  

3. Key Design Requirements for Deep Hole Trepanning Drill  

1. Chip Evacuation Space must exceed chip size to ensure smooth removal—a critical factor in design.  

2. Tool Body Strength & Rigidity: The mounting area for inserts must provide sufficient rigidity to ensure tool longevity.  

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