Why do I need to shovel by hand?
The shovel is a kind of technique which is more difficult than wood sculpture.
The orbit of the shovel is not carried – this is due to the excellent lubrication effect. Flower shovel technicians need to understand many technologies, but only experience can allow it to control the precise and flattened sensation.
When you go through a tool manufacturer and see that technicians are a shovel handmade, you can’t help but ask yourself:
“Can they really count on the shovel to improve these surfaces that have been treated by machines? Will people be more powerful than machines?”
If you mean the pure appearance, then our answer is “cannot”, and we will not do it more beautiful, but why are we always going to the shovel? Of course, there is a reason for that. , if you want to make a comparison, you want to make a comparison. Flowers in hand.
The shovel is not the functioning of the “bare hands” and “freely desired”.
Although the shovel is hard and laborious, it is a skill (art technology); “Why the information is even less information on the shovel. This is perhaps the reason why the shovel is considered an art.
Where does it start?
If a manufacturer decides to grind with a shovel -free grinding bed, the precision of its “mother machine” grinding machine must be higher than the newly manufactured grinding machine.
So where is the precision of the first machine?
It must come from a more precise machine, or it depends on other methods that can produce a really flat surface, or maybe it is copied from a flat surface that has been well done.
We can use three methods of drawing circles to illustrate the surface process (although the circle is the line rather than the surface, it can be cited to explain the concept). A craftsman can draw a perfect circle with an ordinary circle; If he uses a pencil to represent a circular hole on the plastic model, he will copy all the inaccurate places in the circular hole; is determined by his limited skills.
Theoretically, a perfect and flat surface can be generated by alternative friction (crushing stroke) on the three surfaces. For more simplicity, we use three rocks with a fairly flat rock. If you rub the three aircraft alternately in order, you will put these three planes more and more. If you only rub with two rocks, you will obtain a pair of concave and convex coupling. In practice, in addition to using the replacement of the shovel (grinding stroke), it will also follow a clear order of the pairing.
In use, the shovel master will first apply the coloring agent to the standard treatment tool, then put it on the surface of the room to slide it, so that the places that must be removed are revealed. He repeated this action, and the surface of the part will be closer to standard governance, and ultimately, it can perfectly copy the same works as standard governance.
Once the shovel flow is generally used to treat it with a molding at the beach more than a few thousandths than the final size, send it to the heat treatment, release the residual pressure, then return it to the surface before the surface grinding before the shovel. Although the shovel takes a long time and high labor costs, the shovel can replace the process that requires the cost of high equipment. Costly machine for making final petrol.
In the last step, in addition to high cost equipment, there are also factors that must be taken into account. At the time of precision, the strength of this tightening force often causes the room to be deformed, so that the precision of the room after having released the support force;
It is one of the many advantages of the shovel. The cast iron is supported by three points to make sure that it does not deform because of its own weight.
When the shovel orbit of the tool machine is worn, it can also be corrected by the re -hovel, which is a great advantage of throwing the machine or deleting the factory and dismantling and treating it.
When the track of a tool machine must again shovel, this work can be held by the maintenance staff of the factory, but we can also find someone to do the work of shovel.
In some cases, you can use the manual shovel and the electric shovel to obtain the final geometric precision. If there is a set of traces of work and saddle that have been flattened and that the precision has responded to the requirements, it is found that the parallelism of the Ouchette does not specify the parallelism of the main axis (it is necessary to spend a lot of effort to correct it).
Of course, this is not the original objective of the shovel, and it should not be used as a method of correction for large -scale matching errors. Although this method must be competent in technology, it is more economical than making many parts to be very precise to treat many parts to be very precise, or to make reliable or adjustable conceptions to avoid errors of twinning.
Lubrication improvement
Practical experience has proven that shovel orbit can reduce friction thanks to better quality lubrication, but why do you have no reason. The most common opinion is that the low point of the shovel (or a lighter saying, the cut pit, the oil bag that is made for lubrication) provides many oil storage pockets.
Another logical statement is that it allows us to continue to keep a layer of oil film and let the mobile parts float on the oil film, which is the objective of any lubrication. The main reason for this situation is that these irregular fuel bags have formed a lot of fuel retention space, so that the oil is not easy to flee. The ideal lubrication situation is to maintain a layer of oil films between the two perfect smooth surfaces, but for the moment, you have to face the problem of preventing it from flowing oil, or you should complete it from as possible. (It does not matter whether or not there is a shovel on the orbit, you generally do oil grooves to help the distribution of the oil).
This declaration will question the effect of the contact zone. The shovel reduces the contact zone, but it will form a uniform distribution and the distribution is at the center. The more flat the two corresponding surfaces, the more uniformly the distribution of the contact surface. However, there is a principle of “the friction force is not linked to the area” in mechanical science. (Massage consumption is another thing. The smaller the area in the same charge, the more the speed of motorcycle consumption.)
The point I mean is that what we are looking for is better lubrication effects, no more or less contact zone. If the lubrication effect is perfect, the surface of the track will never wear out. If a workbench has difficulty moving difficulties with wear, this can be linked to lubrication without the contact zone.
How did Shovel do it?
The purpose of this section is not to teach the art of the shovel, but to give you a concept of shovel process. Although the real operation is difficult, the concept behind the operation is quite easy.
Before finding a highlight that must be scratched, first apply the color rendering agent to the standard treatment (a right regulation tool when a type V plate or rail is necessary), then to rub on the Orbital surface of the shovel, the color rendering agent will be transferred to the high point of the track surface, then use a special shovel tool to eliminate the high coloring point. Such a movement must be repeated until the surface of the track has a uniform and coherent transfer.
Of course, a shovel master must know all kinds of technologies. I’m going to talk about two of them here.
First of all, before making colors, we usually use a dull knife to slowly rub on the surface of the room to remove the edges.
Second, wipe the surface with a brush or hand, and never wipe it with a broken cloth. If you use a fabric to wipe, the slim linen left by the fabric will cause misleading marks when you make a highlight.
The master’s master’s degree will check its work by comparing standard tools to the surface of the track. (The shovel master can be responsible for his quality of work)
In the past, we all had a set of standards, stipulating the number of summits in each square thumb, and how much a percentage contact rate should be in the total area; In short, the master Master Master generally strives to meet standards of 20 to 30 points per square inch.
In the shovel process, some flat operations use electric shovel machines. When you perform the finest operation, the manual shovel feel is always unable to replace it.
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