How do wooden door factories open the hinge groove of wooden doors? With manual opening is not accurate ah

I have seen large wooden door manufacturers hinge slot and lock hole many are in the manufacturer's equipment to the processing of good because the equipment slot is very accurate to the customer's home when the installation of much more trouble and beautiful Sometimes there is also the actual installation operation will encounter some deviation error, etc. This time it is necessary to installers manually with a tool with chiseling point, pick point, if the hinge slot is not in the wooden door factory to open a good, but also can be opened on site, need a skilled carpenter skilled carpentry work can sometimes be comparable to the equipment made The need for a skilled carpenter skilled carpentry out of the work is sometimes comparable to the equipment made

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