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Carbide Micro Drill Bits

CMD1

Sizes available: 0.1mm - 3.00mm

These very hard, solid tungsten carbide, micro twist drill bits are excellent for producing smooth, precision holes and drilling through all hard metals. Ensure a steady hand when using these micro drill bits, ideally used at high speed in a pillar drill.

Each micro drill bit is individually boxed with a protective rubber sleeve. Be careful when removing the rubber sleeve to avoid snapping the more delicate sizes such as 0.1mm and 0.2mm.

  • Shank Diameter: 3.175mm = 1/8"
  • Split Point: 135 degree
  • Overall length: 38mm

**Can be purchased individually, or as a micro drill bit set of 10 (sizes from 0.1-1.0mm)

Read on for further information including cutting lengths, spindle speeds, feed rates and chip loads of drill bit sizes.

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Description

TIP: Broken Carbide twist drills can be used to make carbide gravers and carbide scribers

Most horologists find the easiest way to use these micro drill bits is by first finding the centre with a graver and then holding a micro drill in a pin-vice and then taking them to the work. Use very light pressure whilst taking the drill in and out periodically. No lubrication is necessary although a small dab of oil can help. 

Extra care is needed with handling these drills as they are very delicate, especially sizes from 0.1mm - 0.4mm. Make sure everything is running true without any lateral movement.

A solid carbide twist drill is perfect for delicate drilling through hard materials for model engineering, archaeology and scientific laboratory work.

Ideal for drilling through PCB, and printed circuit boards. Made of fibreglass, printed circuit boards require a tough micro drill and our tungsten carbide drills range will outperform similar HSS drill bits.

Technical

High quality Tungsten Carbide throughout

  • Shank Diameter: 3.175mm = 1/8"
  • Split Point: 135 degree
  • Overall length: 38mm

Take a look at the different drill bit sizes of carbide micro drills to determine their effective cutting length, spindle speed, feed rate and chip load.

Size (mm)

Effective cutting length (mm)
Spindle speed (rpm)
Feed rate (m/mm)
Chip load (mm/rev)
0.1


1.5
125,000
0.8
0.006
0.2


3.5
125,000
1.5
0.012
0.3


5.5
125,000
2.3
0.018
0.4


7.0
125,000
2.9
0.024
0.5


8.5
95,500
2.9
0.03
0.6


9.5
79,600
2.9
0.036
0.7


9.5
68,200
2.9
0.042
0.8


9.5
59.700
2.9
0.048
0.9


9.5
53,100
2.9
0.054
1.0


10.5
47,800
2.9
0.06
1.1


10.5
43,400
2.9
0.066
1.2


10.5
39,800
2.9
0.072
1.3


12.0
36,700
2.9
0.078
1.4


12.0
24,100
2.9
0.084
1.5


12.0
31,800
2.9
0.090
1.6


12.0
29,900
2.9
0.096
1.7


12.0
28,100
2.8
0.10
1.8


12.0
26,500
2.7
0.10
1.9


12.0
25,100
2.5
0.10
2.0


12.0
23,900
2.4
0.10
2.1


12.0
22,700
2.3
0.10
2.2


12.0
21,700
2.2
0.10
2.3


12.0
20,800
2.1
0.10
2.4


12.0
20,000
2.0
0.10
2.5


12.0
20,000
2.0
0.10
2.6


12.0
20,000
2.0
0.10
2.7


12.0
20,000
2.0
0.10
2.8


12.0
20,000
2.0
0.10
2.9


12.0
20,000
2.0
0.10
3.0


12.0
20,000
2.0
0.10


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