Adjustable Reciprocating Motor Eccentric Crankshaft with 20-80mm Stroke for 8mm or 10mm Motor Shaft

This reciprocating motor component converts rotary motion into linear movement using an eccentric crankshaft and rocker arm design. It is intended for adult hobbyists, makers, and repair technicians who need a reliable adjustable mechanism for automation, model building, or equipment restoration. The stroke can be set between 20mm and 80mm, allowing you to match the output to your specific application. Manufactured from 45 steel and stainless steel, the assembly offers a sturdy build without unnecessary weight.

Features and Construction

The component is designed around a simple mechanical principle: an offset crankshaft drives a rocker arm to produce linear reciprocation. The build materials and adjustable stroke give it practical flexibility for various low-to-moderate load tasks.

Material and Build

The crankshaft body is made from 45 steel, a medium-carbon steel commonly used for shafts and mechanical parts due to its good strength. The stainless steel sections resist corrosion, particularly in workshop or garage environments where moisture may be present. The two-material combination offers a balance of robustness and surface protection.

Size and Practical Fit

The motor shaft hole is offered in two sizes: 8mm and 10mm. You must choose the option that matches your motor output shaft diameter. The adjustable stroke range from 20mm to 80mm is set by altering the linkage point on the rocker arm, giving you control over travel distance without changing components.

Uses and Placement

This rocker arm assembly suits tasks that require repeated linear motion, such as small-scale pumps, agitators, or sliding mechanisms. It can be mounted directly to a compatible motor for straightforward integration.

Event or Professional Use

For professional repair technicians, this crankshaft can replace worn parts in older machinery or custom-built jigs. The adjustable stroke helps fine-tune motion for different repair scenarios, such as valve actuation or lever operation, without needing multiple spare parts on hand.

Everyday Home Use

DIY enthusiasts can incorporate this component into hobby projects like small automata, display animatronics, or workshop reciprocating saws. The steel construction handles typical home-workshop loads, while the stainless steel parts resist rust during occasional use in non-climate-controlled spaces.

Benefits and Buying Value

This product offers a practical solution for adding reciprocation to any motor with an 8mm or 10mm shaft. The adjustable stroke extends its range of application compared to fixed-stroke alternatives.

Reuse and Low Maintenance

The steel and stainless steel construction requires no special maintenance beyond occasional cleaning and light oiling of the pivot points if used frequently. Because the stroke is adjustable, the same part can be reused in different projects by simply changing the linkage setting.

Why Choose This Product

If you need a simple, adjustable reciprocating mechanism that fits common motor shaft sizes, this assembly delivers without unnecessary complexity. The hair joint connector is included for immediate use, and alternative connectors are available on request, making it adaptable to different linkage systems.