As threaded tap yourself if there is no necessary nuts ?

Features and types

tool Tap refers to the group-tapping tools.This group also includes dice, special heads, rolling dies, cutting tools, grinding wheels and so on.The name of the tap obtained from the ancient method of threading.Externally it is very similar to the screw, yes, in fact, this is the screw that was turned into a cutting tool.

In his early made cone that improves centering screw end in the hole and evenly distributed between the turns of cutting force.It has grooves for removing chips formed thereon also.There are also "beskanavochnye" taps - the name speaks for itself.

Taps are hand and machine, and the last to make the cut depth of the entire profile, while the manual is divided into several parts.In this regard, manual taps are manufactured in several pieces on the size of a single thread.They differ in the number of annular grooves, which are applied to the tail - one - the first number, two - the second, etc.

Getting Started

first step to achieve the desired result of the thread diameter is subtracted length of his stride.For example, if the thread M20h1 inner hole diameter should be 19 mm.To begin with there is rough tapping, there is this special tool, which is easy to determine, by a special annular rim.Work with them should be carefully, because it is made from solid but brittle steel, which increases the risk of breakage.

Tip!Due to the fragility of the experts recommend to have at least one tap in reserve.

threaded hole can be made with a drill.Drilling holes should be closely monitored to drill went exactly perpendicular to the surface treatment, without the distortions that can all work to nullify.To fix the tap is used a special tool - knob.If there is no, then you can use an adjustable wrench.For smooth operation, infinite distortions and jerks, the surface is lubricated with engine oil.All chips that is formed in the process, remove reverse rotations of the tap.

Important rules for performance

Now that all the preparatory work has been completed, and made rough cutting tool, comes the turn to do the basic cut.In order to properly and efficiently execute it, you need to know certain rules of operation.

• Cutting tapping in soft metals (copper, babbitt metal, aluminum) requires periodical twisting and removing chips.
• Cutting performed alternately using the entire set of taps.Using medium without the passage of the draft instrument, and then finish, did not speed up the process, but, on the contrary, make it more difficult to work, and the thread will be of poor quality.And finishing medium are introduced without the capstan, and only after the passage of the threads it is applied, and cutting continues.
• blind tapped hole is to a greater depth than the depth of the threaded part, with the expectation that the working part of the tap went beyond the threaded part.Without this reserve thread it will be incomplete.

Important!While cutting is necessary to check the position of cutting a square, it must be strictly perpendicular!

• large role in the quality of work plays a lubricant selection.It is best to use an emulsion, linseed oil, kerosene, turpentine.When working with bronze and cast iron used lubricant is not necessary.

If you violate these rules during operation, the thread will be defective, and the tap can break and stay in the hole.To get it, you need to use a special tool, but it is a complex and time-consuming process, and the thread will be completely ruined.