How tight is screwdriver tight?
It means as tight as you can get it if you only gripped the screwdriver with two fingers.
For light screw-driving applications (e.g. driving small screws into soft woods or pre-drilled holes) up to 5 Nm of torque should be sufficient. For heavy-duty screw-driving applications (e.g. driving small and large screws into soft and hard woods) consider selecting a cordless screwdriver with around 10Nm of torque.
A: This may seam odd, but the different length of screwdriver really doesn't affect the torque directly. Torque is the force applied times the distance from the axis you are rotating about. So the torque of the screwdriver only really depends on the thinkness of the handle.
Even though we may think of torque "wrenches" as necessary only for people who work in heavy machinery or build engines, all threaded fasteners have a torque rating. Using a tool like our Torque Screwdriver will eliminate the risk of stripping threads or under-tightening screws that will come loose over time.
Results: The average peak torque to achieve two finger tightness for all subjects was 0.247 N-m (std dev = 0.057).
Adjective. finger tight. (of a screwed connection) tightened using the fingers, and no tools, to a torque of about 15 to 20 inlb or 1.7 to 2.3 Nm.
For light screw work, a torque of 25Nm is sufficient. If you choose a drill with a torque of between 25 and 50Nm, you can use it for all the usual jobs in and around the house. With more than 50Nm, even professionals will have enough power for heavy screw work.
Power Source
Many cordless screwdrivers come with rechargeable batteries, and they tend to range between 4 and 8 volts. Since a cordless screwdriver requires much less speed and power than a drill, these lower voltages are adequate.
If you don't need much tightening force, go for 3.6 to 4 V and a tightening torque of 5 Nm, or 7.2 V and at least 10-15 Nm if you do. Keep in mind, however, that a professional drill driver is usually more suited to your demands in the latter situation. The suggested battery capacity is 1.5 Ah (most common value).
Average human hand can apply 100N force easily. so you can consider F=100N for your calculation.
Does the length of a screwdriver affect the torque?
A: This may seam odd, but the different length of screwdriver really doesn't affect the torque directly. Torque is the force applied times the distance from the axis you are rotating about. So the torque of the screwdriver only really depends on the thinkness of the handle.
When you look at your screwdriver, you'll see a scale on the nose of the screwdriver. Match the scale on the screwdriver to the torque curve setting that yor assembly application requires. Turning the knob right will increase torque and left will decrease torque.
TORX Wrench Substitute - YouTube
To start with, every electrician must have a torque wrench. An inch-pound torque wrench will be required, and depending on the job, a foot-pound torque wrench may be required.
The clicking / banging you hear is not the clutch, it is the hammer mechanism striking inside the tool.
How to torque without a torque wrench - YouTube
25 nM is "hand tight" in my book. Do NOT use a tool with a long handle on this, if using a socket and a ratchet I would either grab the ratchet by the pivot (not the handle), or use an extension without the ratchet (think like a screwdriver)
A practical way to calculate the magnitude of the torque is to first determine the lever arm and then multiply it times the applied force. The lever arm is the perpendicular distance from the axis of rotation to the line of action of the force. and the magnitude of the torque is τ = N m.
10Nm is not much, it's approximately equal to a kilogram weight hanging off a metre long lever. You can achieve it with one hand on a 1/4" ratchet. If you want to play around and get a feel, set the ratchet to 15Nm and clamp the square end in a vice.
Typically, an under torqued bolt will deform and be unable to provide as much clamping force as needed. An over torqued bolt will break.
What is hand tight?
Definition of hand-tight
: being as tight as can be made by the hand alone : moderately tight.
With access to 110 volts of electricity, corded drills feature powerful motors that generate significantly more torque and speed than their cordless counterparts. As such, they are well-suited for heavy-duty drilling jobs.
4 to 15Nm is fine for all of those smaller screw driver tasks around the home. 15 to 35Nm is a great all-rounder to drill and drive medium sizes screws and hole drilling. 35Nm upward will tackle all of those more serious project with bigger screws and holes.
Engines in mainstream cars and trucks typically generate 100 to 400 lb. -ft of torque. That torque is created by the pistons within an engine as they reciprocate up and down on the engine's crankshaft, causing it to rotate (or twist), continuously.
A cordless screwdriver that has multiple torque settings, may have a drill symbol on the adjustable torque ring. This indicates that it is capable of drilling holes.