Center Punch Mark Dotting Start Hole Positioning Marker

Item No:MP47161

 

1. Essence and structural characteristics of tools

The center punch is a tool used to punch out pit marks on the surface of a workpiece. The core structure is a conical tip + cylindrical handle. The material is mostly high-carbon steel or alloy steel (quenched, hardness HRC 58-62). Its working principle is to hit the top of the handle with a hammer to form a pit on the surface of the workpiece. It is mainly used for drilling positioning or marking the position to avoid slipping or deviation during operation.

 

2. Core role and application scenarios

1. Machining and manufacturing: precise positioning of drilling

Marking before drilling metal workpieces:

In lathes and drilling machines, a central punch is used to punch out pits on the metal surface (such as steel plates and aluminum parts) as the starting point of the drill bit to prevent the drill bit from slipping due to uneven initial contact (commonly known as "deviation").

Case: Mark the position of the bolt hole on the flange, punch the hole first and then drill the hole to ensure the accuracy of the hole position (such as positioning of the pipe flange connection hole).

Wood and plastic processing:

In woodworking, punching points mark the position of screw holes (such as the connection of furniture plates) to prevent cracking of the wood when the screws are screwed;

Position the punch point on the plastic part to prevent the plastic surface from being scratched or deformed when the drill bit cuts.

 

2. Equipment repair and assembly: disassembly assistance and marking

Removal assistance for rusty parts:

Impact the rusty nut, pin or bearing outer ring, destroy the rusty joint surface through vibration, and assist with the wrench or puller removal (such as the engine head bolt is loose).

Part location marking:

Before dismantling mechanical components, mark points at the joints of the parts (such as the relative position of the gear and the shaft) to ensure accurate reset during assembly (such as assembling and disassembling a car transmission gear set).

 

3. Sheet Metal and Metal Processing: Surface Marking and Shaping

Sheet metal parts marking:

Punch the number, size line or bend line marks on the sheet metal parts (such as processing the chassis shell) for easy identification in subsequent processes.

Metal surface shaping:

Light impact dented metal plates, repair small dents through local plastic deformation (such as micro-shaping of automotive sheet metal parts, used with backing plates).

 

4. Architecture and decoration: positioning and marking

Tiles and stone holes:

Position the punching points on the surface of ceramic tiles and marble to prevent the drill bit from slipping and causing the tiles to crack (such as pre-punching treatment when installing bathroom accessories).

Wall pipeline marking:

Mark the direction of hydropower pipelines or socket locations with punching points on the wall to avoid later punching and damaging embedded pipelines.

 

5. Handcraft and DIY production: precise positioning and decoration

Leather and wood craftsmanship:

Make a punch on leather to mark the location of suture holes or decorative holes (such as belt punching), or mark the carved outline line on wood (such as positioning before carving of wooden sign characters).

Model making:

Punch points on the plastic model to mark the installation positions of parts (such as positioning the turret base of a ship model) to improve assembly accuracy.

 

 

3.Usage methods and operating skills

Position marking steps:

Mark the approximate position on the surface of the workpiece with a stylus or pencil;

Hold the center punch in hand, align the tip with the marking point, and keep it perpendicular to the workpiece;

Gently tap the top of the handle with a hammer to create a pit with a diameter of 0.5 - 1mm (depth of approximately 0.3mm, subject to the drill bit not slipping).

 

Removal assistance skills:

For rusty bolts, first punch points at the thread gaps, and then spray rust remover to accelerate the penetration of rust remover through impact vibration;

You can tap lightly multiple times during impact to avoid deformation of the workpiece due to excessive force in a single time.

 

Accuracy control:

In precision machining, you can first use a central punch to lightly punch positioning, then use a small diameter drill bit (such as 1 mm) to pre-drill the shallow hole, and finally use the target drill bit to drill the hole;

Use a caliper or projector to check the position deviation after punching the spot to ensure that it meets the tolerance requirements (such as ± 0.1mm).

 

4. Safety precautions

Protective measures:

Wear protective glasses to prevent metal debris or coating particles on the surface of the workpiece that may splash during impact;

Keep your hands away from the tip of the punch when tapping to avoid hand injuries caused by slipping the hammer.

 

Workpiece fixing:

When punching metal workpieces, they need to be fixed on a bench vise or workbench to avoid shaking affecting positioning accuracy or causing workpiece displacement.

 

Material matching:

It is forbidden to punch points on materials with hardness higher than punches (such as hardened steel and ceramics) to avoid cracking at the tip;

When punching thin metal plates (thickness <1 mm), a hard wooden board needs to be placed under the workpiece to prevent punching through.

 

5. Maintenance 

Cleaning and rust prevention:

After use, wipe the surface of the punch with a cloth to remove metal debris and oil, and apply anti-rust oil to the tip and handle (especially in humid environments);

Blade inspection:

Regularly check whether the tip is worn or cracked. If the edge of the pit is not clear or the punching point is offset, use a grinder to polish the tip (maintain a cone angle of 60 °-90 °);

Storage method:

Store it in a tool box to avoid tip damage caused by collision with other tools. Wrap it in oil paper to prevent moisture when not in use for a long time.

 

 

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