Teach you how to choose plastic steel doors and windows
Many netizens frequently ask questions about the choice of plastic steel windows. The choice of plastic windows is very important. If it is serious, it will endanger the family safety issue. Therefore, it must not be taken into consideration during the selection process. For specific selection methods, we have organized the following several methods. , I hope to give netizens some references. At present, the quality of plastic windows in the market is uneven, in the end how to buy it? The following describes the purchase method: 1, the prison is that the doors and windows to be solid, plastic steel doors and windows frames, four corners of the fan is usually welded, the national standard requires an average angular intensity of more than 3000N. In this regard, there is a need for regular welding equipment to ensure that there are no guarantees for small processing shops along the road. The other is that the connectors and fasteners should be solid, because the main window of the plastic window is PVC, and the wall thickness of its section is usually about 2.3mm, and it cannot withstand the hardware such as hinged window hinges. They need to have sufficient thickness of steel lining support inside, so before buying it is necessary to carefully observe the existence of a small amount of pounds or the possibility of cutting corners, the door and window after the finished product is not easy to check the thickness of the internal steel liner. 2, flat refers to the door and window to be flat, it includes the welding angle can not be high and low dislocation, the two windows can not be uneven mosaic. Ping is mainly reflected in the appearance, it is also an important item that brings beauty to our vision. Ping is also embodied in the national standard, such as: the difference between the height of the welding angle should be within 0.3mm. It doesn't matter if you don't understand the national standard, but you have to look at his sample window and then ask for the quality of the appearance. The quality of the sample displayed by the average merchant is still OK. 3, accurate refers to accurate, mainly accurate dimensions. It includes the size of the actual measurement of the hole and the size of the fan and frame after installation. Inaccuracy of the size often affects the opening of doors and windows and the sealing of doors and windows. The user can simply know that the ordinary door and window frame and the splicing of the fan are generally 8-10mm. If the size is too small (such as 4-5mm), the sealing performance is questionable. 4, dense refers to the sealing performance, the above mentioned size will affect the seal, here talking about the manufacturers to buy the unqualified with the same attachment will affect the seal. For example, inferior rubber bands used by some manufacturers will shrink within six months, resulting in a large gap between the glass and the fan. Rain and air can easily enter the room. Door and window acceptance home furnishing doors and windows windows glass doors
Spade bits are used for rough boring in wood. They tend to cause splintering when they emerge from the workpiece. Woodworkers avoid splintering by finishing the hole from the opposite side of the work. Spade bits are flat, with a centering point and two cutters. The cutters are often equipped with spurs in an attempt to ensure a cleaner hole. With their small shank diameters relative to their boring diameters, spade bit shanks often have flats forged or ground into them to prevent slipping in drill chucks. Wood Spade Drill Bit,Fat Drill Bit,Paddle Drill Bit,Wood Drill Bit Behappy Crafts (suzhou)Co.,Ltd , https://www.jshaoyue.com
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Some bits are equipped with long shanks and have a small hole drilled through the flat part, allowing them to be used much like a bell-hanger bit. Intended for high speed use, they are used with electric hand drills. Spade bits are also sometimes referred to as "paddle bits".
Spade drill bits are ordinarily available in diameters from 6 to 36 mm, or ¼ to 1½ inches.