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Primer plano de la superficie interior de un pomo de ajuste de plástico, en el que destacan las roscas intermitentes diseñadas para la alineación del posicionamiento.
Front view of a plastic adjustment knob with scale markings printed on the surface, featuring a textured design for better grip.
Side view of a plastic adjustment knob showing raised grooves and intermittent internal threads for precise positioning.

Pomo de ajuste de plástico con serigrafía rotativa

SKU: PMI527 Categoría:

Pomo de ajuste de plástico con serigrafía rotativa

This product is a plastic adjustment knob (also called a plastic control knob) designed with precision molding and high-quality surface finishing. Its outer surface features recessed textures for better grip and appearance, while the scale markings are applied using rotary screen printing for sharp and durable results.

Side view of a plastic adjustment knob showing raised grooves and intermittent internal threads for precise positioning.

Product information

Artículo Details
Product dimension Ø50 × 28 mm
Material PA6 GF20
Net Weight Approx. 16 grams
Mold information 2 cavity, 4 sliders, cold runner
Tolerance for key dimensions ±0.10mm
Roundness 0.15mm

Design Features

  • Recessed outer texture improves both appearance and handling comfort. This requires a mold with four sliders, limiting the tool to two cavities.

Front view of a plastic adjustment knob with scale markings printed on the surface, featuring a textured design for better grip.

  • Dimensional accuracy: General to high level, with tolerances of ±0.10 mm and roundness within 0.15 mm.

  • Surface finish: Fine sand texture with strict appearance requirements. No weld lines, gate blush, or gloss inconsistencies are allowed.

Alternatively, PMMA (Acrylic) is another excellent transparent material with better scratch resistance. However, it is more prone to cracking in stress concentration areas, and thus, it is not recommended when screws are used for fastening.

Rotary Screen Printing

  • Inner thread for positioning: The knob’s inner surface has intermittent threads that lock with raised bosses on the positioning shaft, ensuring accurate circumferential alignment during printing.

Fit Precision and Its Impact： The fit between the knob and the positioning shaft must be carefully controlled. If the fit is too loose, it can cause blurred printing; if it’s too tight, the knob may be difficult to fit onto the positioning shaft, reducing production efficiency.

Close-up view showing the inner threads of the plastic adjustment knob aligning with the raised bosses on the positioning shaft.
Close-up view of the inner threads of the plastic adjustment knob, aligning with raised bosses on the positioning shaft for precise printing alignment.

  • Printing alignment: The markings are not random. Each printed number corresponds to a specific inner groove, enabling precise orientation.

Close-up view showing the alignment of printed number "1" with the inner groove on the plastic adjustment knob.
The alignment of the printed number “1” with the corresponding inner groove.

  • Gear-rack synchronization: The positioning shaft is coaxial with a gear driven by a rack, which moves with the screen mesh. This guarantees that the knob rotates in perfect sync with the mesh.

  • Importance of fit: The bosses and threads must engage tightly, minimizing clearance. Any play could cause slipping, resulting in blurred or distorted printing.

 

Watch our video to see the rotary screen printing process in action.

 

Boyan Soluciones de fabricación specializes in high-quality injection molding and custom plastic parts. With extensive experience and a focus on precision, we deliver reliable, cost-effective solutions for various industries.

If you need injection molded parts or custom manufacturing solutions, contact us today. We’re here to help bring your projects to life!

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