Leveling a granite inspection platform requires surprisingly many details. So how do you level the platform?
1. Place the granite platform support frame in the appropriate position and gently shake it. If it's not firm, adjust the feet on the bottom of the frame until it stabilizes.
2. Common support frames have five support points: three on one side and two on the other. Of these three support points, the center point a1 and two support points a2 and a3 on opposite sides are primary support points, while the remaining two (b1 and b2) are secondary support points. To facilitate adjustment, the three primary support points can be raised while the secondary support points can be lowered. This way, the granite platform is supported by only three points, and its height can be adjusted by adjusting only the height of two of these points. (Three points that are not on the same line define a curved surface.) If the support frame has an odd number of support points greater than five, select the center point and the two outer support points (forming a triangle) as the primary support points. The remaining support points serve as secondary support points.
3. Place the granite inspection platform on the support frame. Use a tape measure to measure the distance from both sides of the platform to the support frame. Fine-tune the position of the platform or support frame so that the platform's position on the support frame is nearly symmetrical and balanced. This ensures the support points are balanced.
4. Gently rock the support frame from the side again to ensure it is firmly positioned.
5. Leveling the Granite Platform: The sub-level must be calibrated. If you only need to roughly level the level, you can also use a bubble level. First, place the level on the granite platform in the X direction and check the N1 reading. On the same plane, rotate the level 90 degrees counterclockwise to check the vertical V reading N2. If N1 is positive and N2 is negative, the left side of the platform is higher than the right side, and the back is higher than the front. You can appropriately reduce a1 and increase a3 to bring N1 and N2 readings closer to zero. If N1 and N2 are otherwise positive or negative, you can simulate the method of adjusting the support points. You can also use the position of the bubble on the level to roughly level the granite platform. 6. After the leveling of the granite inspection platform is completed, raise the remaining auxiliary support points so that the top of the granite inspection platform just touches the platform, but do not spend too much effort to avoid affecting the leveling results.