Industry Data Sharing-How to calculate vacuum suction force

Due to a customer's inquiry about how to calculate whether their material can be held by their self-designed vacuum cup, our company researched and found some theoretical information online to share.

Calculating the adhesion force of a vacuum cup requires considering multiple factors, including the size, material, and pressure of the vacuum cup, as well as the weight and surface roughness of the object. Typically, the following formula can be used to calculate the adhesion force of a vacuum cup:

Adhesion Force (F) = Vacuum Pressure (P) x Suction Cup Surface Area (A)

Here, Vacuum Pressure (P) refers to the pressure difference between the suction cup and the surrounding environment, usually measured in pascals (Pa). Suction Cup Surface Area (A) refers to the surface area in contact between the suction cup and the object, usually measured in square millimeters (mm^2). For example, if the vacuum pressure is 50 Pa and the suction cup surface area is 10 mm^2, then the adhesion force is 500 N. However, this formula can only provide an approximate estimate. To obtain more accurate adhesion force calculations, other factors such as the weight of the object, surface roughness, and the material of the vacuum cup need to be considered. These factors can all affect the size of the adhesion force, so further calculations are required to obtain more accurate results.
Below is our company's commonly used theory table for area suction:

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Industry Data Sharing-About CNC milling machine quotes

Why are my quotations for the machine parts so expensive?

The factory's quotation is based on the processing time plus the original material as the variable cost, and if the machine equipment is added, the quotation will be higher. As a customer, you naturally want the cost to be as low as possible. If the product is still under development, modifying the design without affecting the application can reduce the processing cost and naturally lower the quotation.

We also provide some specific directions for reference:

1.Avoid unnecessary right angles
Some right angles are not feasible for our CNC milling machine to manufacture and need to be chamfered or rounded to be manufactured. The larger the rounded angle, the faster it is to process. If a right angle is really necessary, there are other processing methods to manufacture it, but the price will also be relatively higher.
For example, in the following figure, the cylinder is the milling cutter. When entering this deep groove, it will inevitably form a relative rounded angle because the milling cutter is round, rather than a closed right angle.

2.Pay attention to tolerance marking
The precision of the parts is marked by tolerances. For important parts such as the combination of two parts or when the workpiece itself is the reference tool, such as a block gauge, it is necessary to mark the tolerances. For example, the flatness of the workpiece surface,the parallelism of the upper and lower surfacesand the marking of each item will make the process more complicated. However, if precise tolerances are marked on non-essential parts, the quotation will be too high, and it will be an unnecessary cost for the customer.
3.Standard processing dimensions
In hole processing, most have standard dimensions. If there are special dimensions such as ø2.53mm, the decimal point behind the number of digits will affect the processing time and cost. The larger the number of digits, the more time it takes to process and the higher the cost.
4.Large Purchasing Volume
The cost of the first production is always the highest. However, if the quantity is large, the average production cost can be shared, and the cost of raw materials can also be reduced due to the increase in quantity. As a result, the quotation will naturally decrease.
5.Choose appropriate materials
There are many types of metal materials, such as stainless steel with SUS303 and SUS420. If grinding is required and there are no special usage conditions, we recommend that customers use SUS420 stainless steel because it is magnetic and more convenient to process without the need for additional fixtures, resulting in lower manufacturing costs and more favorable quotations for the customer.

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