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  • in reply to: What Are The Best CNC Cutting Tools to Use? #2316
    Graham Steven

    CNC Cutting Tool Types
    Bit drills #1
    Drill bits have a shaft with one or more flutes, which are helical grooves that run down the outside of the tool, and a conical cutting end.
    Center, twist, and ejector drills are the three most common types of drill bits used in CNC machining, and each type serves a certain critical purpose.
    To precisely drill small holes on the workpiece, center drill bits should be used. The holes can then be properly drilled with a twist drill. Ejector drills, on the other hand, are more effective at drilling deep holes.

    End Mill #2
    Drill bits and end mills are comparable, but end mills are far more adaptable. They often have up to eight pointed flutes on their ends and sides, which enable them to quickly remove heavy loads of material. If you want to cut straight into a material without needing a pre-drilled hole, an end mill should be your go-to tool (or spot).
    There are several different types of end mills, with the roughing end mill type being the most popular. Like conventional end mills, roughing end mills feature up to eight flutes. In contrast, the serrated flutes in the roughing end mills allow you to remove more material than the ordinary end mills.

    Face Mill #3
    The starting material (or workpiece) used in CNC milling machines frequently needs to undergo some kind of preparation before you can carry out significant milling operations.
    Before performing intricate cutting operations, you can create flat parts of the workpiece using specialized cutting equipment called face mills. This tool has a sturdy body and a variety of replaceable cutter inserts that may be switched out as needed.
    For more difficult, intricate tasks, you might want to think about employing a “side and face cutter.” For instance, side and face cutters let you cut the sidewalls of the workpiece as well as a groove or slot in a workpiece.

    Reamers #4
    Let’s say a workpiece needs a 1/2″ hole to be made. I assume you can now use a 1/2″ drill bit. Wrong! If you do this, your workpiece will likely end up with an enlarged hole once you finish drilling.
    The best approach to make this hole is to start with a smaller drill bit, such 31/64″, and then enlarge it with a reamer to 1/2″. Reamers provide you the ability to increase the size of already-existing holes while maintaining precise dimensions and close tolerances.

    Gear Cutters #5
    Gear cutters are used to create gears for manufacturing businesses, as their name suggests. It can be used to create many different types of gears, such as spur, bevel, worm, screw, and helical gears.

    Hollow Mill #6
    Hollow mills are cylinder-shaped cutting tools that encircle and rotate around a cylindrical workpiece. They have three or more cutting edges. You may quickly and effectively produce a pre-thread diameter with this cutting tool. For finishing projections that must be in a specific position, you can also utilize them in drill press work.

    Thread Mill #7
    Thread mills are CNC cutting instruments used to create threads, as the name implies. Their function is comparable to that of taps. However, CNC machines equipped with thread mills can cut both internal and external threads, in contrast to taps, which can only cut internal threads.
    If you want to cut through strong metals or asymmetrical pieces, you should choose thread mills.

    Slab Mill #8
    Flat surfaces are cut using slab mills, sometimes referred to as slab cutters or plain mills. These cutters are excellent for fast making wide and narrow cuts because they typically only have teeth on their periphery.

    Fly Cutter #9
    Fly cutters are single-point rotary tools that create a flawless surface finish while making deep or shallow cuts. Fly cutters are less expensive and provide a superior surface finish than the majority of face mills. Your go-to tool for plane surfacing operations ought to be this one.

    in reply to: Proper quality inspection of CNC parts #2315
    Graham Steven

    Machine Tool Accuracy Test: In this mode, examine the machine tool’s precision in movement and centering. Verify a number of additional factors, such as the spindle, bracket, axis, etc. The primary shaft ought to be parallel to the work surface. The shaft’s bend and angle must be precise. Investigate the linear axis.
    Test for Parts or Products: In this mode, examine the part’s dimensions and placement. This also entails inspecting variables including location, surface quality, and shape. Additionally, verify the geometric and dimensional tolerances in accordance with the needs or applications.
    Process monitoring and control involves reviewing the procedures in the process at each level to prevent errors that could result in faulty goods or unneeded manufacturing delays. The product life cycle has several stages, beginning with ideation or conceptualization. Design, a feasibility study, analysis, the trial production phase, testing, mass manufacturing, etc. follow. Here, all levels are involved in the quality check.

    Checkpoints During the CNC Machining Quality Inspection
    When inspecting the quality of CNC machine tools, you should look at the following factors, among others:
    Rapid prototyping must be accomplished when a part is produced on a CNC machine tool. Make sure your machine can produce the necessary goods and prototypes.

    in reply to: What is 5-axis and 7-axis CNC machining? #2085
    Graham Steven

    What does 5-axis CNC milling entail?
    The basic definition of 5-axis machining is the simultaneous movement of a workpiece or cutting tool along five separate axes using a CNC. Due to the ability to machine extremely complicated parts, 5-axis is particularly well-liked for aerospace applications.
    However, a number of variables have helped 5-axis machining become more widely used. These consist of:
    a drive to implement single-setup machining (also known as “Done-in-One”) in an effort to shorten lead times and boost productivity
    the ability to tilt the cutting tool or the table to avoid colliding with the tool holder, which also makes it easier to access the part’s geometry.
    Because the tool and table are tilted to maintain the ideal cutting position and steady chip load, the tool life and cycle time are improved.

    What does 7-axis CNC milling entail?
    The 7-axis CNC machine has 7 axes that it can manipulate (3 translational axes for the movement of the cutting tool, 3 rotary axes holding the workpiece, and an additional axis enabling the rotation of the arm holding the tool head). This arrangement refers to the multiaxis paradigm that was used as a foundation. All tasks can be rapidly and accurately carried out by 7-axis CNC machines, and they also have better capabilities than their preceding setups.

    in reply to: investment casting application & size limits #2084
    Graham Steven

    Investment casting now holds the top position in the casting sector thanks to jet propulsion for both military and commercial aircraft. This casting technology is employed in a wide range of high-tech industrial applications, including massive castings of 300 kg and small castings of 30 kg. In terms of casting processes, this approach is more expensive than sand casting, although the equipment is considerably less expensive. However, investment casting continues to be primarily used for complex designs that cannot be cast using any other technique. In spaceships, jet engines, etc., investment casting is used extensively. Despite being largely dependent on the aircraft industry, this sector is finding that our new field of application is helping it to expand its horizons.

    in reply to: Reliability of AQL in Quality Inspection #1878
    Graham Steven

    The risk to the producer is that an excellent product will be rejected. The Acceptance Quality Limit (AQL) is the percentage of defective items that the plan will accept 95% of the time (in the long run). 95 percent of the time, lots that meet or exceed the AQL will be accepted (in the long run). If the lot fails, we can confidently state that the lot quality level is lower than the AQL with 95% certainty. Similarly, we can say that a lot that is approved at the AQL has a 5% probability of being rejected. The AQL in this case is 0.09 percent.

    Graham Steven

    When deciding which steel to use in your injection molding process, you have two options: hardened steel and pre-hardened steel. S-7, H-13, and 420 Stainless Steel are the most regularly used hardened tool steels, while P-20 and mod pre-hardened stainless steel are the most commonly used pre-hardened tool steels. Specialty steels, such as Maraging 300, can also be employed in thin areas due to their desired physical qualities. Additional information about the most prevalent steels used in injection molding can be found below.

    Pre-hardened steels are commonly utilized in low-volume tools. The mold plate is frequently made of P-20 steel, and the molding can be solidly carved into the plates. If necessary, strong steel might be put into areas of the plate for shutoffs or wear surfaces.
    To prevent corrosion from cooling channels or corrosive materials like PVC, hard stainless steel tooling, such as 420 stainless steel, is employed. Stainless steel cracks more easily than other hardened steels and has a lower heat conductivity. A sharp edge will not hold in stainless steel. For the high-quality surface finish required to make lenses and transparent parts, stainless steel will be used.
    Steels like H-13 and S-7 are tough. These materials withstand wear and frequent injection and mold closing pressures. Corrosion must be avoided at all costs, as water channels corrode over time.
    Heat is transferred through PAS940. Because the material isn’t extremely hard, plating is occasionally applied to impart hardness to the surface.
    Maraging 300 is a high-strength, high-toughness steel that is utilized for thin steel sections.

    in reply to: Important of CMM Dimensional Inspection in CNC Machining #1876
    Graham Steven

    The coordinate measuring machine (CMM) has the advantage of being able to accurately measure items that are difficult to measure with other measuring equipment.
    With a hand tool like a caliper or micrometer, it’s difficult to measure the three-dimensional coordinates of a specific point (hole, etc.) from the virtual origin. Other measuring machines have difficulty measuring virtual points and virtual lines, as well as geometrical tolerances, which can be measured using a 3D CMM machine.

    in reply to: Is Servo Motors is the best motor of CNC machine? #839
    Graham Steven

    Servo moror is not the best I think, they are more helpless to harm because of overheating and over-burdening.

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