Screw KIND

In the science of building machines to distinguish the two types of basic on-screw thread, namely:

1. Screw thread fastener with sharp profile:
2. Screw driver with a trapezoidal shape or profile of a right-angled
Threaded fastener connection with his need to have revolved small and therefore single-threaded forever.
Screw-driver in connection with its need-often have revolved larger and used for single or doubles.

      With screw-screw revolved from it, meant the distance of two points corresponding row of street ¬ screws, measured through painting line .

Sample images threaded screw

With a diameter of the screw thread, meant the greatest diameter. So on the outside of the screw thread diameter was measured on the outside of the screw thread. The middle line is the core of the smallest diameter, so the pads screw-threaded outer portion, measured in a notch of the thread-screw.
People called single-screw screw, bi ¬ la, there is only revolved sa tu ¬-screw and doubled if ¬ ter to two or three pieces of thread-screw ¬ row. Screw-fold screw ¬ ¬ sen-double with her, at the same size, ¬ mempu gammer revolved larger than single-threaded-screw ¬. Therefore, the removal of the stem or nut by ¬ ¬ majors each and every axis rotation of the screw thread-doubles at greater than a single-screw thread.
For more binder used sort-niacam as follows:
a. Whitworth-threaded screw (British Standard Whitworth, sheet N 83).
This kind represented by the letter W and a given diameter in dim England, in particular central line has revolved ¬ greatest of all sorts of screw-sharp screws and therefore also ditoreh deepest.
With this we can immediately differentiate Whitworth screw thread of all sorts of screw se ¬ other krup; threaded screw-top corner it has 550.
In a public building skills people almost always have to Whitworth threaded screw bolts, the ends-tap etc.. The first drill holes with a diameter, the same as the core diameter of the screw thread desired. Therefore spiral cutting edges of the drill to form a corner in 1200, the bottom of the hole being drilled ¬ cone shaped.

Having drilled the inside of the threaded screw holes by using a tap hardened steel. While it may not incise screw thread with a tap and hold until the pedestal in the deepest hole in his ¬, people draw lines-scratch, which explains the outer diameter of the screw thread in the hole, to facilitate, well kept up on its base.
In the picture, where the end pictured above tap holes tapped, more clearly seen pointing ¬ marks the difference between the outer and inner screw thread.
The down side of the end most are not allowed to touch the tap on the bottom of the hole, because then people will not be able to attract harder tip tap well into the threaded screw hole. Screw thread end coincides with the outer edge of the material.
Regarding the length of the screw thread and the end of the tap, which is screwed in the material, we can discuss further. If there is a material thick enough, people take this long, for steel and steel castings equal to 1 ½ times the diameter of the screw thread.
Because screw thread in cast iron more easily broken than in steel, cast iron people take to 2 times the diameter of the screw thread. In the thick material is inadequate, for quite a length of steel, which is equal to the diameter of the screw thread and for iron-castings with length equal to 1 ½ times the diameter of the screw thread.
As we have said, the hole uliran forever more in his term than the screwed portion of the tip tap. Unless there is also a kind of gruff gang subtle kinds of screw thread, which usually also has apex angle of 550. Un ¬ tuk explained that it was Whitworth thread-screw, so to menjeias ¬ that corners-peak 550, the mark on this kind of screw thread with a capital letter, W. Beyond the midline can say it in dim English ¬ or ¬ da lam mm. To differentiate from the ma ¬ rugged cam, one must explain ¬ except with outer diameter also with screw thread revolved from the UK or the amount revolved dim in each dim England. Figure 152 is an example of the combined size of the British and metric sizes.

If D is the outer diameter of the screw thread Whitworth, regardless of whether it rough, smooth or uliran gas, the diameter of the base of the screw thread, the so-called midline gist: Dk = D - 33 / n mm, if it is amount of thread screw thread each dim England.

b. The metric screw thread. (Gazette N 81 and 82).
Screw thread, which is marked with the letter M and where people give diameter in millimeters, has revolved smaller than Whitworth screw thread and also ditoreh less deep. Su ¬ dut peak of screw thread is 600. With a smaller revolved, especially at larger diameters, with the same power and the key to the crank length we can obtain a harder erection. The connection example for geteran, easily dislodged, most metric threaded screws to prevent this deficiency. Figure 153 shows the range of ¬ screw thread at the end of the piston rod and the nut that fit him. If D is the outer diameter of the screw thread, the core diameter Dk and S revolved, it is generally shall apply for metric screw thread, that
Dk = D - 13, S mm.

c. Smooth metric screw thread (sheet N 1144 and 1305).
This screw thread dipa ¬ ¬ menghen kai when people climb the smaller revolved again. To differentiate from the usual metric screw on the side of the screw outer diameter is given also revolved ¬ anya eg M 16 X 1.3.

d. Screw gas (British Standard Pipe glue ¬ baran N 176).
Screw gas has revolved smaller and primarily used on and in ¬ in thin-walled cylinders, such as pipes, telephone-telephone kiosk, etc., because this thread is not ditoreh ¬ screw in, so it raises the slightest weakness-his small ¬ . Also for mounting hardware others, to the greatest extent possible the screw thread must hold the gas and water, it is widely used for gas screw. The angle of the screw-top gas is 550, like the corner of Whitworth screw thread ¬.
People signaled to the gas screw with the letter G. and size given in dim England, but people do not write it as the center line, as it turns out the picture 154. The difference is the other kind of screw thread causes is the next thing. When we say the gas threaded ½ ", we mean is, that can be sliced ​​on the pipe diameter which there is ½". Outer diameter of the pipe, so of screw thread is also a ½ "+ 2 x thickness of the pipe wall . so the center line of gas threaded ½ "is greater than 1/2".
Now to keep the error, in connection with a variety of screw-screw other people writing sizes as no gas screw diameter. To screw thread commonly used kind of the next move.

e. Trapezoid screw thread. (Gazette N 364 and 365).
Trapezoidal screw thread, which is often used for trunk-lid aperture of the cover, rod-screw of the screw lifter ¬ na-flops and flops kettle, etc.. in making a single or doubles. Kind ¬ screw thread, we give a sign with the abbreviation Tr; midline and ki sar ¬ we give in millimeters, as shown drawn Tr 155 Although explanations have been enough, sometimes people also draw on external screw thread and da ¬ lam, profile screw screw on se ¬ part of its length,

f. Uiir rectangular screw and screw thread elbow to elbow.
Screw-screw, which is used in things like sort TSB. above, are not normalized, because ¬ ka normalization committee considers that the technical screw thread tra ¬ pesium better. But the right-angled screw thread is still there very much, and therefore for this kind of printing a list. In terms of length of screw thread is marked de ¬ stands with Rh. Beyond the center line given in mm. If the screw thread metric entirely constrained by size, then one also gives revolved in mm. In figure 156 is described, that the stem screw thread and nut are rectangular with outer diameter of 28 mm and revolved of 5 mm. There are many well happen, that gives the number of threads per dim England is supposed revolved. If you have 5 threaded screw thread each dim the UK, then there revolved fifth. "Described in figure 156B, the shaft and the nut has a screw thread elbow to elbow with outer diameter of 28 mm and revolved of 1/5". As with trapezoidal screw thread there, too, that people draw the profile of the screw thread in most of its length. If D is the outer diameter, Dk-core diameter and S kisarnya, it shall apply for a right-angled screw thread generally Dk = D - S.
To mark the screw thread also welcome people to see the sheet N 784.
If you really watch the sight of 156 people in the picture look, the screw thread begins and ends with a part of the screw is not sudden. In this case 157 images DIPER ¬ lihatkan on A to B for the rod and the hole. Thin metal sheets are easily warped so need one at the base and the tip of the screw thread by hand. It is not saving and must be avoided. Therefore, it is expected that also the right-angled screw thread screw thread and the triangle at the base and tip of the stem or hole is tilted at an angle of 120 degrees peak