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Specific technologies

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Technical points for vertebral arch screw:
Multi-axis vertebral arch screw Multi-axis U-shaped nut SET SCREW HOOK Experience sharing

Multi-axis vertebral arch screw
  • Processing steps：
    1. Rough turning the outer diameter of thread, and then truing the outer diameter of thread
    2. Finish turning thread and truing rough edge
    3. Join the parallel thread and cone thread (7.2 x 5.20L)
    4. Truing the sphere of the back spindle
    5. Broaching hexagonal hole or plum hole
    		•  Key control：
    1. Parallel thread joining cone thread (7.2 x 5.20L)
    2. Jaggedness of bone thread
    3. No rough edge at turning point and milling blade
    4. Broaching hexagonal hole concentric with bone thread
    5. Unique spherical design shall meet the design’s requirements
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    Multi-axis U-shaped screw nut
    Processing steps：
    1. Punching, internal turning and turning internal thread
    2. Truing outer circle
    3. Truing rough edge of internal thread
    4. Truing rough edge of internal hole of the back spindle
    5. Truing 3-point concentric orifice
    		 Key control：
    1. No remain of rough edge at the joint of the U-shaped groove and internal thread
    2. No remain of rough edge at the joint of side hole and internal thread
    3. No gap at the joint of the U-shaped groove and round rod
    4. No cut mark or rough edge on the surface
    5. Buttress thread shall meet the design’s requirements
    6. Angle of the U-shaped groove and 3-point concentric orifice shall meet the design’s requirements
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    SET SCREW
    Processing steps：
    1. Punching and internal turning
    2. Broaching hexagonal hole or plum hole
    3. Truing outer circle
    4. Finish turning thread of outer diameter
    5. Truing section of back spindle
    		 Key control：
    1. Saw tooth thread shall meet the design’s requirements
    2. Broaching hexagonal hole and plum hole
    3. Hexagonal hole and plum hole shall be concentric with thread
    4. There should be no rough edge on the bottom of the hexagonal hole and plum hole
    5. The end surface shall be plane without dead center point
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    HOOK
    Processing steps：
    1. Rough grooving and fine milling flute
    2. Rough grooving semi circle flute and finish milling semi circle flute
    3. Circular saw grooving
    4. Truing section at back spindle
    5. Punching, internal turning and turning internal thread
    		 Key control：
    1. No turning mark on finish milling outer edge
    2. Two end surfaces shall be plane without cut mark
    3. Location of thread hole shall meet the design’s requirements
    4. Surface jaggedness of internal thread inside hole
    5. No turning mark or rough edge at bottom of semi circle flute
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    Experience sharing

    Now there is a common experience to share with you which however often bothers every one of you! When you encounter material such as: SKD, HSS (high speed steel), M2 (high speed steel), titanium alloy, etc, punching can be a real headache for most of you. We hope the information below will provide a solution for you.

    The blade of tungsten steel drill bit commonly sold on the market will usually obtain truing by diamond abrasive wheel #2000 or above after forming. But when processing special materials like the ones mentioned above, these tungsten steel drill bits will not endure a long time before it breaks, due to its sharp blade.

    Have you ever encountered the situation when it gets hard to get the knife out after it cuts into the fruit? The problem lies in the plane blade surface without saw tooth to drain the water; this is why the blade surface should be saw-toothed.

    Now let's discuss the situation where a blade breaks due to heating and cracking, resulting from continuous friction during punching on a CNC head-sliding lathe. The simple solution is: use a grinding machine to recondition the drill blade with saw-toothed blade surface. This will greatly save time, work and cost.
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    Experience sharing

    There is a problem which most technicians often come across: For materials that are hard to turn, and with outer diameter of around 20mm, using a disposable cut-off tool sold on the market will greatly increase the cost, and the efficiency of the cut-off tool will be greatly lowered due to the large outer diameter. So how can you effectively cut down the cost of these tools? This is a real headache for every technician!
    Here’s a method for grinding a broken blade, with trimming illustration provided for your reference! We hope this will help you to cut down the cost.
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