Steelmachining time formula

Frank Bierings from the Netherlands makes wooden pictures with a High-Z CNC machine. The special thing about the  Pop-Art-Pictures ist the plastic 3D effect, which results from a smoothly milled wooden relief and the painted shads afterwards.

Before he starts to mill Frank Bierings downloads the samples for his wooden pictures from the internet. He doesn’t have to worry about copyright infringement because he only uses the motives for non-commercial purposes. In the given example Mr Bierings chose some Cat woman motives, which he wants to put in scene impressively. First, he mills some contours with different depths into the wood board to create a 3D effect. For generating the milling paths, he uses the software Vcarve Pro, a 3mm cutter and a 60 ° V-Bit for bevelled edges.

Metalmachining time formula

This formula is used to calculate the net power required for face milling based on the depth and width of cut, the table feed per minute, the specific cutting force, and the machine efficiency. Example of calculating the net power required to cut tool steel with: Depth of cut (ap) = 5 mmWidth of cut (ae) = 70 mmTable feed per minute (vf) = 300 mm/min Other conditions: Specific cutting force (Kc) = 1800 MPaMachine efficiency (η) = 80% (0.8)Cutting speed (vc) = 80 m/minCutter diameter (DC) = 250 mmNumber of teeth (z) = 16 In this case, first you calculate the spindle speed (n) and then the feed per tooth of the cutter (fz). Spindle speed (n) = 1000・vc ÷ π・D = (1000 × 80) ÷ (3.14 × 250) = 101.91 min-1Feed per tooth (fz) = vf ÷ (Z × n) = 300 ÷ (16 × 101.91) = 0.184 mm/toothSubstitute the above into the formula: Pc = (5 × 70 × 300 × 1800) ÷ (60 × 106× 0.8) = 3.937 kwThe net power required for face milling (Pc) is approximately 3.94 kW.

Furniture making is a good example of time efficiency using a CNC router. The carpenter has to mill grooves into faces and sidewalls of cupboards to slide in separation- and back walls as well as little holes for connectors and big round recesses for concealed hinges.

Milling complex shapes handwork with conventional tools quickly reach their limits, for example, milling bevelled recesses, roundings or finish-machined contours of writings, patterns or images. A CNC router can do this 2D and 3D woodwork more precise and faster than a skilled worker due to processing calculated milling paths with presets of feed rates and infeed depths.

Cncmachining time formula

This page introduces formulas for calculating basic parameters necessary for face milling. The figures obtained from the calculation are for reference only. The conditions for machining depend on the machine tool you are using. Use the optimal conditions according to your actual machining circumstances.

Machining time formulafor turning

Milling a Turner’s Cube made of oak, pear- and limewood shows the High-Z router’s performance. The cubes look nested inside each other, although they are made of one single piece of wood. Without grinding the contours are already flat, and the surfaces are already even. The excellent woodwork is made with a milling machine of the High-Z T-series and a high-quality cutting bit.

Cuttingtime formulafor milling

Machining time formulapdf

This formula is used to calculate the cutting speed from the spindle speed and the outer diameter of the cutter. Example: Cutter diameter (DC) = 100 mmSpindle speed (n) = 400 min-1In this case, the cutting speed (vc) is approximately 125.6 m/min.

Cuttingtime formulafor drilling

This formula is used to calculate the machining time from the total table feed length and the table feed per minute (feed rate). Example of finishing a block of FC200 cast iron to have a flat surface of: Width = 150 mLength = 250 mmFace milling conditions used: Feed per tooth (fz) = 0.35 mmNumber of teeth (z) = 12Spindle speed (n) = 200 min-1Cutting speed (vc) = 120 m/minFace mill diameter (D1) = 220 mmIn this case, the table feed per minute (vf) and the total table feed length (L) are:vf = 0.35 × 12 × 200 = 840 mm/minL = 350 + 220 = 570 mmSubstitute these values into the formula: Tc = L ÷ vf = 570 ÷ 1120 = 0.679 (min) × 60 = 40.74 (sec)The machining time (Tc) is approximately 40.74 seconds.

The proven CNC router High-Z/T even processes hardwood like oak, beech tree and ebony with high accuracy. It is critical for precise woodworking that the machine is stable in every axis because hardwood’s resistance applies high counter forces on the entire machine construction. The ball screws of the High-Z T-series bring more precision and speed to the milling process without wearing out from the force effect.

The above-shown workpieces were made with a High-Z router. Our customers appreciate the flexibility of the machine. The operator can put the CNC mill on every table, but we also supply the machine with a base frame. The open frame construction enables the machining of high objects, such as acoustic guitars. The user can even manufacture and reproduce small wooden parts which are often needed to make wood models.

This formula is used to calculate the table feed per minute (feed rate) from the feed per tooth, the number of teeth, and the spindle speed. Example: Feed per tooth (fz) = 0.2 mm/toothNumber of teeth (z) = 8Spindle speed (n) = 600 min-1In this case, the table feed rate is 960 mm/min.

In our practical example, we processed chipboards with a depth of 2200x600x190mm on the RaptorX-SL milling machine. The applied solid carbide cutting bit mills the grooves and concealed hinges with clean and free of burrs edges. The cutting bit is perfectly suitable for all laminated and veneered kinds of wood. The cut is 20mm deep, and the feedrate is between 30 and 60mm per second. We vacuumed the chips and the fine dust directly at the cutting tool to avoid any health risk. Due to the suction, there was no need for cleaning work afterwards.

Milling deep, flat surfaces and clean cutting edges are crucial for precise woodworking. A computer-controlled cutting bit with rotating blades can work out complex recesses with 3D effects much more accurate than a hand-operated tool. The High-Z router produces clean edges and surfaces which even don’t need a final grinding. Certainly, a high-quality wood cutting bit is necessary for perfect milling results.

After finishing the milling work, Mr Bierings flattens the pictures with sandpaper and paints them with wood lacquer. The final results are beautiful 3D wooden pictures in POP-ART-Style.

Machining timecalculation Excel

More frequently artisans, skilled workers and hobbyists use a CNC router for woodwork which they have handcrafted before. The machine is quicker, more accurate and less error-prone. The operator can use the working hours more efficiently because he can do other work during production. He even increases his profit, because wood consumption is much more efficient due to less material waste.

This formula is used to calculate the feed per tooth from the table feed per minute (feed rate), the number of teeth, and the spindle speed. Example: Table feed per minute (vf) = 450 mm/minNumber of teeth (z) = 10Spindle speed (n) = 600 min-1In this case, the feed per tooth (f) is 0.075 mm/t.