Choosing the Right Boring Head in Deep Hole Drilling Machines
When boring aerospace components, medical equipment or engine blocks, precision is critical to speed up production and maintain finish quality. Choosing the right tooling can make the difference between a job defined by delays and one where productivity flourishes. In deep hole drilling, which involves long series production, operators have a range of tools to choose from including drills, gun drills and even boring heads.
Choosing the wrong boring head can exacerbate chatter, lower rigidity and shorten tool life. This will ultimately cost production. In the best case, this will mean remaking a few parts to remove gummed-up stock, in the worst case it could result in scrapping whole batches of finished work. In addition to the usual factors (such as abrasiveness, cutting depth, feed rate and lubrication) that determine bore accuracy, it’s important to consider the orientation of the boring bar. To avoid creating a negative rake that can lead to chatter or poor surface finish, always orient the top (flat) surface of the boring bar so it passes through the center line of the spindle axis. This is referred to as the neutral rake angle and will produce good results.
In addition, minimizing boring bar stick-out, using a sleeve or collet that wraps over the bar and burying it deeper in the chuck or vise will help to improve the positioning. Digital boring heads also simplify the adjustment process by allowing operators to read the increments on a screen rather than having to rely on a vernier scale.
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