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1

Here is my chart drawn up from over 30yrs onsite experience... (sorry its in millimetres for those stateside!) More detail here screws explained chart. (NB based on UK/EU experience)


0

The most common causes I find are: Posidriv screw with Phillips bit or vice-versa (not mentioned elsewhere, hence this answer) Cheap screws made out of too soft metal Not pushing hard enough on the drill Too small a screwdriver head, giving insufficient grip, and thus rotating and 'filing away' the screw head Lack of predrilling means that the torque ...


1

It may be impossible to avoid with low power, or substandard screw-guns. If I'm stripping heads it's a low battery. Set the drill to it's highest setting, low gear is for screws that just won't go in and you need the extra torque. In low gear it's going to be really hard to apply the necessary pressure to keep the bit from slipping. Push as hard as you ...


2

All of the above, but also, you could be using really crappy screws. Cheap screws can have their heads stripped pretty easily. You absolutely should see if you can find the manual for your drill--it may have multiple settings (for speed and torque). Definitely pre-drill, and if you're still having problems, some head designs strip less easily...I'm using ...


1

When you say drill. what type of drill do you have? Electric Drill: Generally a drill used for drilling is geared to fast and does not provide enough low speed torque for screwing things in. Coupled with that, it does not have an instant off or speed break. you can use a special adapter with these drills but its not ideal, These electric drills (And the ...


16

It is possible that there are several reasons for the screw head destruction. You may be using an electrical tool that is not at all suitable for driving screws. Some tools designed for drilling holes are not going to offer enough torque at a low enough speed to properly drive screws. If your tool starts out with a huge burst of speed it can almost ...


6

Is this an impact driver ? If not, Lower the torque setting on the drill. Use the correct sized bit for the screw. For Phillips head screws there are several sizes. If you are using a posi-drive screw, use a posi-drive bit. Sometimes you can use a square drive bit with posi-drive, but using a phillips bit will generally cause the bits to cam out. Try ...


1

Define "tiny". Normally a grinder is used to hollow out a hard rock. Knowing what kind of rock it is may be relevant. For example, if it is subject to fracturing, you definitely want to use a grinder and take special measures. To hollow out a sphere manually the typical equipment would be a flexible shaft grinder with a right angle attachment. It will be a ...



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