Cordless drill/drill bits question

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Forum topic by pete4242 posted 04-10-2014 05:56 PM 935 views 0 times favorited 8 replies Add to Favorites Watch
View pete4242's profile


23 posts in 2032 days

04-10-2014 05:56 PM


I upgraded lately to the Bosch hand drill 12V from a cheap chinese cordless 7V

I have a 3mm brad point bit, use it for pilot holes, I been using it for some time now and doing just fine. When I used it with the new drill, it broke in two, the counter sink bit too and even a screw :)
The new drill comes with 25 speed levels, I set it at around half. When I set it at lower speeds it goes really slow and heats up.

Anyone with the same model can give me some guidance?

- pete

8 replies so far

View dawsonbob's profile


3378 posts in 2205 days

#1 posted 04-10-2014 06:16 PM

If I’m seeing correctly, the 25 markings are clutch settings, NOT speeds: they’re meant for using the drill as a driver. If you turn that numbered collar all the way to the right, you should see a little icon of a drill bit; that’s the setting you want for drilling. The variable speed is in the trigger. Also, on top of the drill you have a slider switch that’s used for setting the drill speed: one position for high-speed, low torque, the other for low-speed, high torque.

Edited to add that I’m basing what I’ve said on my 18v drill driver: I don’t have the 12v that you show, but Bosch is fairly consistent in how they do things.

-- Mistakes are what pave the road to perfection

View bigblockyeti's profile


5822 posts in 2171 days

#2 posted 04-10-2014 06:22 PM

It’s not uncommon for even a cordless drill to generate head when running at lower speeds, due to the triac in the variable speed switch doing more work (especially in high torque applications) and the cooling fan in the motor is spinning slower.

-- "Lack of effort will result in failure with amazing predictability" - Me

View pete4242's profile


23 posts in 2032 days

#3 posted 04-10-2014 06:56 PM

Thank you for the replies.
As per the manual, the ring with the numbers is the torque and the sliding button on top is the dual speed as you are saying, but in the manual they dont suggest specific settings for the different tasks. I thought low speed with medium torque should be fine for drilling into beech wood, its hard.
If I understood well now, for drilling I should use the first gear with the lowest torque (where there’s the drill symbol). What would be the suggested settings for driving screws? Any other suggestions for other uses… so I can use the tool to its full potential.
Bigblockyeti, sorry, I meant to say the bit is heating up and not the drill itself.

- pete

View MalcolmLaurel's profile


300 posts in 2073 days

#4 posted 04-10-2014 07:04 PM

For drilling you should always use the highest torque setting, where the clutch doesn’t slip at all (yes, the drill symbol). Drilling small (3mm) holes in wood, you should drill as fast as the drill goes. If the drill bit is heating up too much it’s either dull or you’re trying to drill too deep a hole without periodically pulling it out to clear the chips.

For driving screws, use the slower speed on the slider, use the trigger to control the speed from there, and set the clutch so that it just slips when the screw is driven home.

-- Malcolm Laurel -

View dawsonbob's profile


3378 posts in 2205 days

#5 posted 04-10-2014 07:07 PM

The sliding button on top controls the power range (torque) of the drill when the clutch collar is set to the drill setting. For general drilling, you want it set to the high-speed setting.

The clutch settings control how hard the driver will drive a screw/nut/bolt/whatever before spinning freely and no longer driving. The lowest setting (e.g. 1) will allow a “soft” touch for driving delicate screws, etc., while the highest setting will bring the entire force of the drill to bear (which will pretty much cam out almost any phillips head screw, so be warned).

The trigger controls the speed, whether it’s being used as a drill or a driver.

-- Mistakes are what pave the road to perfection

View SCOTSMAN's profile


5849 posts in 4035 days

#6 posted 04-10-2014 08:13 PM

I just use relatively slow speeds for screwing into wood etc anything screwable direct hard wood pre drill with a countersing drill bit all in one . I find them great,and fast high torque for drilling.Alistair

-- excuse my typing as I have a form of parkinsons disease

View jinkyjock's profile


488 posts in 2025 days

#7 posted 04-10-2014 08:55 PM

Hi Pete, I have had the 14v version for about 8yrs now and it is a good tool to have, once you get used to the settings you will be fine. Setting 1 and screw symbol for driving (and removing) screws, Setting 2 and drill symbol for drilling holes.
Trigger for variable speed, torque(number) setting depending on screw or drill size. Get yourself some drill/countersink bits and a quick change holder, and you will be flying no problem.
Good luck.

View pete4242's profile


23 posts in 2032 days

#8 posted 04-11-2014 07:21 AM

Thank you all for the information, extremely useful.
The quick change bit holder, I didnt know it exist! I will sure get one, thanks Jinkyjock.

- pete

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