6pcs High Speed Steel Spot Drilling Set Weld Cutter Titanium Coated Bits, HSS M42 Bit Spotting Drills with 90 Degree Angle, 120° HSS-COBALT SPOT DRILL SET 6, 8, 10, 12mm, Nc Spot Drill Hss Carbide Stub Center Bits 60 90 120 Degree, SPOTTING DRILL SET 90DEG HSS-COBALT TiNite Round Shank 90 Degree Drilling Tool, Spot Drill HSS Co Cobalt NC Center Bit 60 90 120 Degree, Carbide Spot Drill NC Spotting Drill Set, Woodworking Metalworking & Multipurpose Drill Bits China Supplier Factory
6pcs High Speed Steel Spot Drilling Set Weld Cutter Titanium Coated Bits Specifications
Material High Speed Steel (HSS)
Cutting Diameter 6.5 Millimeters
Finish Type Titanium
Shank Type Straight
Cutting Angle String 118 Degrees
Color: gold, silver
Material: high speed steel
Product Size: 1/4in (6.5mm), 5/16in (8mm), 3/8in (10mm)
Package details:
3 x spot weld drill bit
Product Content: You will receive 3 pieces of spot weld drill bits, a set to easily handle common automotive and metalworking needs.
6 Sizes: This set of sizes includes 1/4in (6.5mm), 5/16in (8mm), 3/8in (10mm) designed for precision, suitable for most spot welds on vehicles, appliances or metal sheets. This drill is only for spot weld drills and cannot be used for other non-spot weld drills.
Safe Design: The sharp and centered design minimizes slipping, keeping your workpiece and fingers safe.
Premium Material: These drill bits are made of strong high-speed steel and reinforced with titanium coating, which is heat-resistant and durable to ensure long-lasting sharpness.
Efficient Tool: Replace time-consuming grinding or chiseling with these efficient cutters. A must-have tool set for mechanics, manufacturers and home garage enthusiasts.
Can I use a spot drill instead of a centre drill?
Many machinists utilize centre drills for spotting instead of real spotting drills. Center drills are designed to provide a hole suitable for a lathe centre. They have a two-part tip with a tiny pilot and the bit’s bigger countersinking region. While centre drills are less expensive than spot drills, they do have certain drawbacks:
Suggestion: The little pilot tip, for example, is highly fragile, and if it breaks, the drill will stop cutting. Not a good thing if your profession requires you to find many holes. 7pcs HSS M42 Bit Spotting Drills with 90 Degree Angle
The angle of Large Spot: Another issue is that the whole angle of a centre drill is usually 60 degrees. When spotting, aim for an angle greater than the twist drill’s angle. The closer the first contact is to the outside diameter of the twist drill, the narrower the spot angle. If the flutes of the twist drill aren’t entirely polished, one will make contact with the spot hole before the other, causing the drill to deflect. It violates the goal of spot drilling and can lead to a less precise hole. Because of the wider angle of a true spot drill, the tip of the twist drill cuts first, resulting in a more precise hole. 120° HSS-COBALT SPOT DRILL SET 4 PCS 6, 8, 10, 12mm
Finally, the web of a spot drill is often narrower than a centre drill, allowing it to cut more readily and with less heat.
Do I need a drill chuck or a collet chuck? SPOTTING DRILL BIT SET 5 PCE 90° HSS-CO 6, 8, 10, 12, 16mm
Whether to utilize a drill chuck or a collet chuck for a spot drill or any other twist drill is separated since we’re maximizing two parameters, each with a specific option. Use a collet chuck for spot and twist drills for maximum precision. Traditional drill chucks and setscrew endmill holders are less precise. On the other hand, the drill chuck is the winner in terms of holding power. This is why: The drill chuck’s grip is concentrated in three areas. If the metal isn’t firm enough to resist, that grip marrs the shank of the twist drill. A collet, on the other hand, distributes the strain uniformly 360 degrees around the shank, resulting in less grip. When tightened, the interior workings of drill chucks utilize wedges to produce tremendous mechanical advantage. This produces a higher gripping force than a collet. Finally, I recommend utilizing collets for smaller drills, such as 1/4′′ and smaller, and drill chucks for bigger diameters that require greater holding force. TiN Coating 90° Spotting Drill Set 4 Piece 5% Cobalt HSS
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SIZE
|
Diameter
|
Total Length
|
Flute Length
|
Cutting Angle
|
|
3.0
|
3
|
46
|
12
|
60° / 90° / 120°
|
|
4.0
|
4
|
55
|
14
|
60° / 90° / 120°
|
|
5.0
|
5
|
62
|
16
|
60° / 90° / 120°
|
|
6.0
|
6
|
66
|
18
|
60° / 90° / 120°
|
|
7.0
|
7
|
70
|
20
|
60° / 90° / 120°
|
|
8.0
|
8
|
79
|
22
|
60° / 90° / 120°
|
|
9.0
|
9
|
84
|
24
|
60° / 90° / 120°
|
|
10.0
|
10
|
89
|
26
|
60° / 90° / 120°
|
|
11.0
|
11
|
95
|
28
|
60° / 90° / 120°
|
|
12.0
|
12
|
102
|
30
|
60° / 90° / 120°
|
|
13.0
|
13
|
102
|
32
|
60° / 90° / 120°
|
