#21,352 in Tools & Home Improvement
Reddit mentions of Bosch CO2139 3/16 In. x 3-1/2 In. Cobalt Drill Bit
Sentiment score: 0
Reddit mentions: 1
We found 1 Reddit mentions of Bosch CO2139 3/16 In. x 3-1/2 In. Cobalt Drill Bit. Here are the top ones.
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- Withstands high-temperature applications for extended periods of time (up to 1,100 degreeF)
- Rigid, thick web design adds stability to bit in tough applications
- Surface hardened to penetrate tough abrasive materials
- Available in jobber length, full shank
- Best used for drilling into light-gauge metal, high-carbon steel, aluminum and ally steel, cast iron, stainless steel and titanium
Features:
Specs:
| Color | Metallic |
| Height | 0.21 Inches |
| Length | 5.9 Inches |
| Number of items | 1 |
| Size | 3/16-Inch |
| Weight | 0.03 Pounds |
| Width | 1.8 Inches |
> Now trying to drill out chuck holder screw but itβs simply dishing the screw head
Try a harder drill bit like cobalt.
https://www.amazon.com/Bosch-CO2135-2-3-Cobalt-Drill/dp/B000AESUE4
Then blast it it with a heat gun in there, to get everything to expand. Yes the screw will expand too, but when it cools down it can break up some of the friction on the threads.
Then soak it with some penetrating oil (Kroil, Liquid Wrench). Then a screw extractor in the hole you drilled should be able to do the trick.
https://www.amazon.com/Irwin-Industrial-Tools-53535-Extractor/dp/B00004YOBF
May have trouble keeping the motor shaft from turning; might have to remove the motor from the drill body and hold the shaft in a vise. Don't chew up the shaft with the vise jaws; maybe hold the commutator in wood jaws.
That's all I can think of!