Drill

The program will calculate the Spot Drill Size and Drill Time based on the speeds and feeds residing in the database for the material selected.

The final time includes spot drilling and drilling of the hole(s). Allowance for the approach of the tools is also included.

The program will factor in the new time based on the type of drill with the feeds and speeds result changed base on the factor rules in the table within.

The special drill table includes the change in SFM and Feed based on reports from industry. The results of those changes are multiplied to calculate the final multiplication factor used to change the original time for high speed steel drill.

Example: If a drill manufacturer says his drill can result in an increase of 25% speed (SFM) and an increase of 15% (Feed), than the table will include a time rate change as follows: SFM = 1/1.25% = .8 and feed = 1/1.10 = .87. Multiplying the two together, the time factor change is .696. So, if the Drill process yields a time of 1 minute, this drill will do it in .696 minutes.

Sources:

Dormer: TiN (Titanium Nitride) change in speeds and feeds.

Cleveland Twist Drill: TiN (titanium nitride, gold color) coating offers added lubricity and hardness resulting in improved chip flow, significantly improved wear life and finished hole quality. TiN coatings are used in a broad range of materials, especially ferrous materials, typically at as much as 35% greater drilling speeds than uncoated tools.

Cleveland Twist Drill: TiCN (titanium carbonitride, blue-gray color) is harder, tougher and more wear resistant than TiN and is engineered for very aggressive machining in a broad range of materials, including ferrous and nonferrous materials, under conditions of moderate cutting temperatures. TiCN may be run at 50% higher cutting speeds than uncoated tools.

Cleveland Twist Drill: TiAlN (titanium aluminum nitride, violet color) coating are designed for very aggressive machining of stainless steels, high alloy carbon steels, nickel-based high temp alloys and titanium alloys. They can run at 100% greater speeds than uncoated drills and offer improved wear life, especially in conditions where high temperatures can be generated. Use with caution in nonferrous materials because of tendency to gall.

Merlin Tool: Tool life and higher feeds and speeds are operating objectives. The high lubricity of TiN facilitates chip flow, prevents build up and reduces cutting forces and temperature. TiN reduces wear and improves chip formation to extend tool life. TiN is a good choice for the machining of iron-based materials, molding of plastics, and for components requiring resistance to abrasive and adhesive wear.

Winslow Engineering: Winslow-Helical "S" drill points feature a continuous, formed relief separated by an S-shaped chisel edge.

Hougen: (Rotobroach) is a multi-toothed tool that is hollowed out on the end similar to a hole saw, but much sturdier. Some tools also have a pilot.

Stove burner drills were originally made for drilling out holes in a round tube that had undergone considerable heat. Kinda sorta like your grandfathers stove pipe in the kitchen cast iron stove. They consist of cobalt and are the next best thing to using solid carbide.

A spade drill is usually a two part drill. The cutting point being removable and usually made of high speed steel. Often spade drills will have coolant lines running through the body. Since the cutting point is removable, one drill can be used for a good range of hole sizes. It can also be use to make stopped holes.

Wikipedia: Spade drills are capable of cutting to a depth of about 10 times the drill diameter. Cut diameters are typically in the range of about 3/4" to 3". A spade drill is usually a two part drill. The cutting point being removable and usually made of high speed steel.

Metals Handbook: Coolant fed drills start with an increase of 10% feed and 25% speed.

Core drills are multiple fluted usually 3 or 4 flutes. The SFM is run at about 66% of that of a conventional drill. A 4 flute core drill will run at twice the feed (IPR) because of the multiple flutes. The hole is predrilled or pre existing like in a casted hole before using the core drill.

Indexable Carbide Insert Drill operate at a higher SFM, but a much lower IPR. These are great drills for holes larger than 1.500 inches on Lathes. They are also used on Mills, but many times require a center guiding drill as part of the assembly of the Indexable Drill.