Advice 1: How to thread

When repairing furniture and various household things in the course of work, often need the connection details of construction by means of threaded connections. The cutting quality of carving in the home, time-consuming and requires skills, but this problem is solved.
How to thread
You will need
  • You'll need: a vise, a file, taps, dies, tap wrenches, machine oil and desire.
Thread is, in essence, a spiral groove cut on an outer or inner cylindrical surface. Mainly used to connect different parts with each other. In engineering can be used to convert translational motion into rotary and Vice versa. There are two types of threads such as metric, with the profile angle 60o and pipe with angle 55о.
In a metric thread diameter and thread pitch measurements are in millimeters. In the designation of a metric thread is used alphabetical and numeric labelling, such as M8x1. 5. The number eight corresponds to the thread diameter, and 1.5 indicates the thread pitch, the distance between turns.
In inch thread, the measurements are conducted in inches and the number of turns per inch. One inch is equal to 2.54 cm To the inch example thread record 1 1/4".
Cutting external threads.
To cut external threads you need to take a die of desired size to prepare the workpiece, and in particular, to pick up a workpiece of a particular diameter. The diameter of the workpiece for threading is determined by the tables. In practice, for cutting, for example, a thread diameter of M6, required rod cross-section of 5.92 mm, that is approximately one-tenth of a millimeter smaller for the thread M8, the workpiece should have a diameter of 7.9 mm.
Here's an example excerpt from the table of diameters for metric threads:

Thread diameter/shaft diameter (mm) - 5/4,92; 6/5,92; 8/7,9; 10/9,9; 12/11,88; 16/15,88; 20/19,86; 24/23,86
After the selection of the workpiece, it is clamped in a vise, a file is removed from the end of the chamfer for proper setting of the dies, and rotary-clamping movements and threading do not forget to lubricate the part with engine oil.
Dies for cutting external threads.
The internal thread is cut by the tap. Pre-drilled holes must be smaller in diameter, you need thread. Extract from the table of diameters of drill bits for drilling holes are shown below.

Thread diameter/hole diameter (mm) - 2/1,6; 3/2,5; 4/3,3; 5/4,2; 6/5,0; 8/6,7; 10/8,4; 12/10,2; 16/13,9; 20/17,4; 24/20,9
For threading inside the part, you must have two of the tap, roughing and finishing.

Also hold the detail in cutting and rotational movements with slight pressure threaded tap draft, periodically lubricating the tap with engine oil, then make a finishing pass. Thread ready to use.
Taps for internal threading.
For more quality threads do turn of a knob 180 ° clockwise and then 90°. Due to this cut long chips and decreases the force on the knob.

Advice 2: How to cut a thread on the pipe

The ability to cut threads on pipes is a fairly useful skill. However, in our modern apartments cut into the threads very often. Therefore, it is enough to get a normal plumbing vise and knob set of dies. The size and material is selected for thread cutting dies depends on the properties of that particular pipe.
Thread on the pipe - a useful skill
At the end of any die has to be crammed stamp reflecting the necessary information. Note the steel grade of the dies and thread designation. The thread is left and right, so that the brand can meet the appropriate letter symbols ("R" or "L"), indicating the direction of the thread.
If you need to cut threads in a pipemade from high-strength stainless steel, then you will need a die of appropriate diameter marked R18. Even better to use the die marked R18F2, where "F2" denotes that the tool steel contains up to 2% vanadium acts as an alloying additive. In the absence of the listed dice will fit steel die stamps P9, which is quite common.
The dies can also be cut or uncut (solid). The first will allow you to achieve precision, by passing the thread in several passes with parallel adjustment of the thread diameter with the locking screw knob.
This files most often for threading the pipes are used round dies, although for threading manually often use a sliding die, fixed in a special oblique die stock and having numbers from one to six.
Want to know how to cut thread? It's not difficult. Take any driver, it pick up the die for cutting the desired thread on the pipe of the necessary diameter. Insert the die into the ratchet and secure it there by tightening the bolts two or three sides. The tube should hold in a Vice, wrapping it if necessary, something soft (such as cloth). Install the die to the pipe end and start to rotate, simultaneously pressing: start to cut carving. After reaching the desired mark, simply Unscrew the die back. If the die is a little tight going back again scrolling to the end of the thread, turning it back and forth a few times in particularly difficult areas. That's all.
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