Selection of a drill according to the geological conditions

 use single bottom of auger core drilling bit bucket, if the diameter is too small can or bucket with dumping soil clovenfooted board core drilling bit bucket. 2, mud, sticky soil is not strong, sand, cement poor gravel layer smaller particle size, can be equipped with a double bottom core drilling biting core drilling bit bucket. 3, hard clay: use a single port into the soil (single double bottom can) auger core drilling bit bucket, bucket teeth straight or spiral. 4, permafrost: less available ice bucket teeth straight auger hopper and auger core drilling bit bucket, can be large cone ice auger, a description that auger for soil (except silt outside) are valid, but there must be no use of groundwater in the case, in order to avoid the suction effect caused by stuck. 5, cemented gravel and strongly weathered rock: be equipped with a conical double bottom auger and auger core drilling bit bucket (large diameter single-port, dual-port with a small particle size) 6, stroke bedrock: drum cutter with coring core drilling bit - Tapered auger - rotary core Drilling Tools bucket digging double bottom, straight or spiral cutter core drilling bit - rotary core drilling bit bucket digging double bottom. 7. breeze bedrock: with cone core drilling bit coring barrel - conical auger - Rotary core drills bits bucket digging double bottom should be taken if the diameter is too large grade core drilling biting process.

core drilling bits The second choice of carbide drill consideration

Processing stability
     In addition to considering core drills bits accuracy requirements, the need to consider the stability of the machine tool when selecting drill. Machine stability is essential for safety and drilling precision drill bit life and therefore require careful inspection machine spindle, fixture and accessories working condition. You should also consider the stability of the drill itself. For example, the overall rigidity of the best carbide drill, so you can achieve high precision. The poor structural stability carbide indexable insert drills, prone to deflection.  Drilling Tools is installed on two indexable inserts, wherein the central portion of the inner hole of the insert for machining, then working from the inside of the outer blade to the blade edge portion at the outer diameter. Since only the initial stage in the processing of the cutting blade into the drill in an unstable state, can easily cause the drill body deflection, and the longer the drill, the greater the amount of skew. Therefore, when using longer than 4D carbide indexable insert core drills bit and drilling, drilling should begin at an appropriate stage to reduce the amount of feed, cutting into the stable phase after the feed rate to normal levels . Welded carbide drill and replaceable carbide drill crown is composed of two symmetrical self-centering cutting edge geometry blade type, which has a cutting edge design and high stability when it does not need to cut into the workpiece reducing the feed rate, only when the drill bit into the workpiece surface tilt when installed with a certain inclination to cut exception, this time recommended drill, drill when the feed rate is reduced from . Because these drill steel drill body can produce small deformation, and therefore well suited for lathe; carbide drills due to the larger overall brittleness, when used lathe easier to break, especially when the poor condition of the drill centering when even more so.

 

core drilling bits Selection step drill

Rational use of carbide core drills bits in the past, it was believed that drilling must be carried out at a lower feed rate and cutting speed, this view using ordinary drill under processing conditions used to be correct. Now, with the emergence of carbide Drilling Tools bits, drilling concept has changed. In fact, by the correct selection of a suitable carbide drills, drilling can greatly improve productivity, reduce processing costs per hole.

core drilling bits Drill classification

The drill is used for drilling in solid materials with a through hole or blind hole, and can have a hole for the reaming tool.Core drills bit classification? Material, technology, standards and other classification Material: High-speed steel, cobalt high speed steel, carbide Process: grinding, milling,Drilling Tools Standard: DIN, ANSI, ASME, BSF, BSW, JB, ISO, GB / T, as well as other non-standard Some also divided according to surface treatment: TiN, TiAlN, nitriding, grilled blue.

core drilling bits Selection considerations carbide drill

Precision:
  Selection of carbide core drills bit, the first need to consider the size of the drilling accuracy. Generally, the smaller the aperture is processed, its tolerance is smaller. Therefore, the drill bit manufacturers usually be processed according to the nominal diameter of the hole size on theDrilling Tools classification. In the four types of carbide drill, solid carbide drill precision highest solid carbide tolerance range , so it is the best choice for machining precision holes; welded carbide drill or replaceable carbide drill crown tolerance range  hole machining is generally more suitable for accuracy requirements; installation carbide indexable insert drill is more suitable for heavy roughing, Although it is usually lower than the processing cost of several other bits, but the precision is relatively low, the tolerance range  , it is generally used for hole machining accuracy is not required , or by complete facelift boring blade finishing hole.

core drilling bits Drill classification

 Core drilling bits should be packed in a special packing boxes, to avoid vibration collide.When ⒉ use, remove the drill bit from packing boxes to be loaded into the spindle collet that header or automatic replacement drill tool library. Then run back into packing boxes. ⒊ core drill bits  diameter measurement tools to use microscopes and other non-contact measurement equipment, to avoid the cutting edge in contact with the mechanical gauges were bruised.⒋ some CNC drilling using some CNC  core drilling bits  positioning ring retaining ring is not used, such as the use of its fixed ring during installationDepth positioning must be accurate, as it does not use retaining ring fitted to the  core drilling bits spindle elongation to adjust consistency, multi-spindle drilling machine to pay attention to this point, to make the drilling depth of each spindle to be consistent. If it is not possible to make the drill bit to drill the table or unable to Drilling Tools through the circuit board caused scrapped. Drill slowly lifting the box, the four legs of the box corresponding drill holes into four turntable rig, according to the choice of the appropriate size drill core drill box, lifting the  core drilling bits core box drill box into the body and then to groove and drill drill core box corresponding convex tip installed, will drill into the box drill, drill that card on the turntable heart. Then turn on the drill spin coupling nut drill pipe.

core drilling bits What are the different types of drill bit used

Common core drills bits, probably divided into rolling twist, the whole ground drilling, divided into straight shank drills, taper shank drill, 1/2, etc. shank drill, drill-headed, single-head short Drilling Tools, center drill, hex shank drill , hammer drill, impact drill, etc., the material also can be roughly divided, 4241 #, 4341 #, 9341 #, 6542 #, M35, M42, alloys.