How it is correct to handle a carving? Cutting
… If openings drill
to connect preparations by bolts, it is necessary to take a drill diameter slightly more, than diameter of a bolt on 0,5 - 1 mm. Such gap compensates possible inaccuracies in the provision of openings in preparations. By the way, to reduce these inaccuracies, it is recommended to connect preparations and to drill them together for one pass.
It is even more difficult to drill an opening under a carving. Here it is necessary to guess diameter of an opening very precisely. It has to be less outer diameter of a carving, but it is more internal. It is clear, that if diameter of an opening is too big, the carving will turn out incomplete, and even there will be no carving.
At the same time diameter of a drill has to be slightly more, than the internal diameter of a carving. Why? Because when cutting a female thread metal partially “ it is squeezed out “ and at different metals differently. Plastic deformation of soft and viscous metals is more, than firm and fragile.
If the drilled opening is not enough, the squeezed-out material will be “ to stick “ to tap teeths (the special tool for cutting of a female thread). In such mode the carving at best will turn out “ fragmentary “ in the worst - the tap will break.
Cutting a carving in soft metals, be limited to cutting of a carving only the first tap. In such opening the screw keeps stronger.
the Carving in a deaf opening will be purer if previously to fill an opening with the melted paraffin and to cut a carving when it hardens.
Screwing up …
If to you needs to bolt details several or screws, do it in a certain order. At first screw up all fasteners a hand, then for one or two passes consistently tighten each of them a key or the screw-driver and only after that tighten completely.
The fixture located around it is necessary to tighten a cross - crosswise, and distributed on the area to tighten from the center of a detail to edges. Release fasteners upside-down.
Always try to pull a key on yourself, otherwise it can slide off, and you rasshibt to yourself fingers. If nevertheless it needs to be pushed, do it by an open palm.
When checking or a repeated tightening of a nut or a bolt, weaken a nut or a bolt on a quarter of turn, and then tighten to the necessary value of the moment of an inhaling.
It is useful to miss the mark threaded connections with special greasing that at the following dismantling not to suffer with an otvorachivaniye and to protect a carving from atmospheric actions. There is no special greasing - grease with a thin layer of lubricating oil.
Unscrewing … As the rusted screw or a bolt is easier to take
? Most correct, and rather it is more professional to make it by means of the special drummer or snap. And if there is no special tool? It is expedient to moisten strongly pro-neighing carving with turpentine or kerosene.
These liquids help to separate the rust particles which stuck to each other. It is sometimes expedient to heat a nut of a bolt or a screw head a blowtorch or a gas torch. If it is impossible to apply naked flame, it is possible to use a big molotkovy soldering iron or the heated iron bar.
Restoring … the ends of bolts act as
At the correct connection of details over a surface of nuts on couple of rounds of a carving. And what to do if the bolt is much longer? Correctly, to cut off. But you remember that any thing can be truncated, but not everyone manages to be extended. Hold your horses! Besides, at such operation the carving on the end of the shortened part is inevitably damaged.
Before cutting off excess part, screw a die or a nut on the fastener. Having cut off superfluous, saw round a cut a file, and then screw together a die (nut) - the carving is restored.