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What is Gun Drill Tool?

Deep-Hole Drill was initially invented for ‘Gun-Driiling’application in Europe during the second world war, and since then it’s popular as Gun-Drill. However, last 75 year, its applications are extended automobile and other engineering metal cutting industries for Deep-Hole Drilling. still, these Deep Hole Drills are yet popularly called ‘Gun-Drills’, even if other used for other applications. It is a thin cutting tool to produce hole in a metal at high depth diameter ratio

 

What is Gun Drill Tool?

For exceptionally precise deep holes in metal work pieces, Gun drill tool are perishable tooling components that enter coolant through the machine spindle and midsection of the tool, and exhaust chips in a groove along the length of the tool.

A sophisticated grinding equipment, or CNC cutter grinder, can be used to sharpen gun drill tool numerous times to extend their life. For form tool operations, customised forms can also be machined into gun drill tooling tips.

By using high pressure coolant for clean chip exhaust, the gun drilling method can drill deep holes beyond what is achievable with conventional gear and tooling such as twist drills, even at extreme depths.

Gun drilling was first established for the production of gun barrels, when straightness and barrel durability were both required for proper operation. For maximum performance and utilisation on current, specialised gear, the gun drilling technique and tooling have been optimised. Gun drilling is still widely used in the firearms industry. Diesel fuel components, medical tooling, plastic injection moulds, and other industries are among the others.

 

Accusharp Cutting tools have entered into this new segment of Round tools For Deep Hole Drilling applications. The applications are for deep hole drilling On Crankshaft, Engine-Blocks, turbo-Blades, Paper Rollers, Machine Tools, and Fixturing etc. we are the leading Gun drill tool manufacturers from pune.

 

The main purpose of a gun drill tool is to drill consistent holes in one pass. The machine work is therefore fairly simple. The entire machine consists of the gun drill itself, the machine, the coolant supply system, the work holding fixture, and the part handling equipment.

Standard geometry for Gun Drill has been shown herewith. However, it may change according to its applications for different work materials and machining parameters. Moreover any change, in cutting edge geometry will have an effect on bore surface finish, geometrical accuracy, drill centring, chip shape, chip removal, process reliability and useful life of the Drills etc.

 

Deep Hole Drilling 

Gun drilling is a deep hole drilling technique that produces holes in metal with large depth-to-diameter ratios by using a long, thin cutting instrument. Gun drilling works on diameters ranging from 3.00mm to 32 mm.

The distinctive head shape of a gun drill tool distinguishes it from a normal twist drill; a standard gun drill has a single effective cutting edge that removes chips as it advances into a metal work piece.

Gun drilling was first established for the production of gun barrels, when straightness and barrel durability were both required for proper operation. For maximum performance and utilisation on current, specialised gear, the gun drilling technique and tooling have been optimised. Deep hole drilling utilized in a variety of industries. Gun drilling is still widely used in the firearms industry. Diesel fuel components, medical tooling, plastic injection moulds, and other industries are among the others.

By using high pressure coolant for clean chip exhaust, the gun drilling method can drill deep holes beyond what is achievable with conventional gear and tooling such as twist drills, even at extreme depths.

Gun drilling can be done on standard CNC machines, but only to a limited extent. To achieve the best productivity and process dependability, more often than not, specialized equipment is required.

Accusharp cutting tools provide perfect deep hole drilling solutions for customer problem.

 

ACCUSHARP Gun drills are straight fluted drills which allow cutting fluid (either compressed air or a suitable liquid) to be injected through the drill’s hollow body to the cutting face. ACCUSHARP drills used for deep drilling—a depth-to-diameter ratio of 300:1 or more is possible. Gun barrels are the obvious example; hence the name. 

Other uses include moldmaking, diemaking, and the manufacture of combustion engine parts such as crankcase, cylinder head, and woodwind musical instruments, such as uilleann pipes, as gun drills can drill long straight holes in metal, wood, and some plastics. 

The coolant provides lubrication and cooling to the cutting edges and removes the swarf or chips from the hole. Modern gun drills use carbide tips to prolong life and reduce total cost when compared with steel tips. Speed of drilling depends on the material being drilled, rotational speed, and the drill diameter.

Gun drill tool are easily consolidated with CNC machining centres, lathes and milling machines for a reasonably small investment, which makes these tools economical for a small or large business with varying production requirements. 

Our standard grinding geometry can take care virtually of all drilling operations successfully. However, for any special working conditions like deep hole drilling long chipping material that is difficult to machine. we design and manufacture  Gun-Drills with special geometries accordingly.

Our Present range of Gun drill tool is of Diameters between 4 and 30 mm, having length up to 1000 mm.

Accusharp Cutting Tools is leading Gun drill manufacturers in India. It’s a deep hole drilling technique that use a long, thin cutting tool to drill holes in metal with large depth-to-diameter ratios

 

Features :    

  • High-calibre Performance
  • Deep Hole drilling solutions end here.
  • It is developed for long, straight hole of high accuracy, dimensional requirement.
  • Gun drill tool can make hole of specified size.     
  • Gun drill tool used in deep hole drilling applications 
  • Superior Quality.                                                                                                                                

                                                                                                                            

Application :  

  • Medical Equipment Industry
  • Plastic injection molds
  • Die and Mould Industry
  • Aerospace Industry
  • Defence
  • Metal Industry
  • Diesel Fuel Components
  • Firearm
  • Automotive Industry
  • Turbo Blades 
  • Paper Rolls, Water lines
  • Heat Exchanger Tube sheet

More ever, guidance from our technical experts would always be available for any critcal problem other than the above common issues to resolve.

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High Ratio Drill | Break point Drills | Accusharp Cutting Tools

A high ratio Drill generally used for the machining of mining bits, ACCUSHARP provides the best solution for this. The bits which require a high accuracy hole as tolerance given, Accusharp make ratio drills used for drilling high accuracy holes with higher parameters. No, retract line, no burr folding. Eliminate the 180° end mill in flat-bottom drilling, geometry-combinations available to cover most common materials drills are easily consolidated with CNC machining centre’s, lathes and milling machines for a reasonably small investment, which makes these tools economical for a small or large business with varying production requirements.

Accusharp provides high performance Ratio Drills tool to reduce machining cost especially in extravagant machining centers, workable machining systems and transfer lines. Our Ratio Drills offer a new dimension, especially with regard to quality and quantity.

For one of our customer, Accusharp designed a tungsten carbide special drill. This special drill is used for final operations on a component of large batch sizes having component dimension s between 125 mm to 330 mm. the components have multiple holes in the range of 36 to 70 no’s in a single work piece.

Project Profile

The end-user is manufacturing Mining Drill Bits (Cone & Shirttails Legs) made from EN36c material, Using a STAMA Twin spindle (5Axis) vertical machining centre with flood coolant.

Challenge

Previously the customer was using Other Make tools on Stama Twin spindle VMC. The drill Dia 14 mm hole in the Major in all cones. As cones have two types one is regularly turned cones and the other is welded cones. Existing drills having the issue of Size consistency, taper hole and bottom finish Rough. As component tolerance 0 to 25 micron, but still getting the drill life issue and continue tip breakage issue and inconsistent tool life of 100 to 400 holes only. The rejection percentage is more. Accusharp was called into the customer’s shop and offered the opportunity to provide a solution to the terrible tool life and costly machine time they were experiencing.

Our Solution

Accusharp Provides the Best Drilling grade (Super Fine Grade).

Project Data

Accusharp Provides the Best Drilling grade resulted in Good Tool Life with an excellent bottom mirror finish. Using 705 RPM and 0.14 feed. No of holes getting 700 to 750 as previous have 300 to 400 holes. Taper ovality of holes within 3 to 4 micron.

By using Accusharp drills customer gets the below Benefits.

  • Tool Life increased by 40 To 50%
  • Tool Breakage stopped.
  • Avoided components rejection
  • Tool changing frequency saved
  • Increasing productivity due to less tool change.
  • Cost/pc is low than existing
  • Quality of drilled hole improved up to last drilled hole
  • Operator’s waiting getting less for taking quality approval

Competitor’s drill had issue of:

  • Size inconsistency for required tolerance 0 to 25 micron,
  • Hole taper > 25 micron.
  • Bottom surface finishes rough 1.6 to1.8 Ra).
  • Poor and inconsistent tool life between 10
  • 0 & 400 holes.

Tool Pictorial (Photo)

Tool Conceptual Drg.

Component Photo

Features:

  • Strong Break point geometry
  • Smooth flute form
  • High Accuracy
  • Reliable high Quality hole
  • Tolerance achieved within 7 micron
  • Creates a true flat-bottom hole from O.D. to center.
  • Extremely high speed and feed rates.
  • Good surface quality
  • Dimensional accuracy of holes
  • High Dynamic stability

Application:

  • Machining of mining bits
  • Heat-treatable stills
  • Suitable for long and short-chipping materials such as construction, tempered steels.
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Drill | Solid carbide Step Drill | Accusharp Cutting Tools

Drill or drill machining tools used for making round holes in solid material. Drilling tools are End cutting tools designed for producing holes in the work piece. The diversity of drills can be used to cut circular holes in work pieces. Step drill preferably suited for cutting metals, Plastic, Wood.

ACCUSHARP offers a complete range of high performance, general-purpose, finishing, roughing, high-speed, micro, and material-specific S/C Step drill for high productivity and extended tool life. HSN2 coating for the higher life, SC drill that offers a one-pass solution in steels and irons in traditional tap sizes to reduce cycle time and increase productivity. Drilling and chamfering in one shot. The highly polished surface ensures superior chip evacuation even when a low-pressure coolant is applied.

For General Purpose usually HRc30 ~ HRc50

Special design for good centring, smooth chip removal and powerful drilling

Special surface treatment after coating to reduce friction and better chip flow

With the help of experienced engineers, we have been able to design and develop Solid Carbide Step Drill. These are designed and manufactured by the professionals in compliance with the industry standards. The offered drills are widely acknowledged for their attributes such as perfect finish, accurate dimensions, high strength and durability.

Step drill used for all Alloy steel, Cast Iron, stainless steel, Inconel and Aluminium material. For Aluminium material step drills available in uncoated with flute polish and for other material with special coating (HSN2 & Alcrona).

Features:

  • Cylindrical shank
  • 4 facet
  • Countersink angle 90°
  • Point angle 140°
  • Right hand cutting
  • 2, 3 or 4 flute
  • Helical or straight flute
  • Single or multiple diameter
  • Single or double margin
  • Solid or coolant through
  • High performance point

Grade:

  • KF40 micro-fine
  • GU25
  • TiAln/TIN coating
  • All dimensions are in mm

Parameters:

The Parameter recommendation for Accusharp step drill for steel material VC is 45 to 80 mtr/min, for cast iron 65 to 120 mtr/min and for aluminium 90 to 200 mtr/min for solid step drills reduce 15 to 20 % VC as given for TCH step drills.

Parameters:

  • Solid Carbide Step Drill
  • Solid Carbide TCH Double Margin Long Drills
  • Solid Carbide Micro Drills
  • Solid Carbide Center Drill
  • Solid Carbide TCH Double Margin Drills
  • Solid Carbide Ratio Drills

Benefits:

  • STEP DRILL combines two or more than two operations in Single Tool.
  • Operation cost gets reduced.
  • Cycle time to manufacture the Component gets reduced.
  • Inventory of tool gets reduced.
  • Overall Productivity Increase.

Accusharp product is better than our competitor product.

  • Accusharp Design, Manufacture and supply the Special Step Drills within 15 Days.
  • Each Tool and Each parameter of Tool gets 100% Inspected.
  • Inspection report gets for all tools.
  • Final Approval of Tool Design is done by Customer who checks and Confirms Deigned tool can full the requirement.
  • Step Drills are manufactured on World CNC Grinding Machine
  • Selection of Carbide rod is done as per application of Tool.
  • Mostly used in Batch or Mass production.

Applications:

  • Suitable for centring holes in steel, SS, CI, AL, applications
  • Automobile Industry
  • Aerospace Industry
  • Medical Equipment Industry
  • Suitable for drilling tap holes with countersinks
  • specific point geometries
  • Micro engineered edge prep
  • Coated to maximize performance, the high efficiency in drilling