MWD Precision Locking Bushings

The core characteristic of the form and position tolerances of this part is "high-precision fit:
√ The outer diameter tolerance must achieve a small clearance (≤0.1mm) fit with the inner hole of the MWD short section;
√ The fillet must precisely fit the curved surface of the adjacent component to avoid clearance wear caused by downhole vibration;
√ The coaxiality requirement between the threaded section and the smooth section is ≤0.1mm to ensure no axial offset after assembly.
√ Roughness: Ra 0.2μm
MWD Precision Locking Bushings is a downhole part, is MWD components, is a precision locking bushing in the MWD system, its core function being a dual "positioning + locking" mechanism for the internal components of the MWD sub.

Product Introduction

MWD Precision Locking Bushings is a precision locking bushing in the MWD system, its functions are:

Precise Positioning

Through a high-precision fit of the outer diameter, it fixes the internal sensor/circuit module in a designated axial position on the sub, ensuring coaxiality between the module and the drill string axis.

Locking and Anti-Loosening

The threaded end can engage with the sub housing or other components, combined with a rounded (R3.1±0.1mm) curved surface fit structure, preventing components from loosening in the high-frequency vibration environment downhole.

Buffering Protection

The thin-walled structure with a rounded transition (marked as "recessed area of thin-walled part" on the drawing) buffers drilling impacts, preventing damage to internal precision components from rigid collisions.

MH has worked on such functional downhole tool component, especially MWD components for world leading customers for more than 20 years.

High Geometry Tolerances Key Technical Challenges

Machining small-sized precision features is difficult, especially given the minute outer diameter.

Maintaining dimensional accuracy is challenging with small fillet radii (R<1mm).

Controlling the coaxiality of multiple features is difficult; threaded sections, smooth sections, and arc sections must maintain a coaxiality of ≤0.1mm.

Controlling deformation of thin-walled sections (≤1mm) and curved surfaces is also challenging.

MH Manufacturing Solution

√ Beijing Jingdiao Carver 600TE_A12S supports machining with micro-tools (0.5mm diameter) and low cutting force.

√ MAZAK VCS530CL offers a repeatability of ±0.003mm, completing threaded and smooth sections in a single clamping operation.

√ Brother TC S2Z features thin-wall deformation control with a precision pneumatic chuck, controllable clamping force (≤5N), and a micro-cutting feed rate ≤0.05mm/r, minimizing thin-wall deformation.

√ Mitutoyo LH-600E/EG height gauge provides accuracy of ±0.001mm.

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