How do Reciprocal Shakers work?
A reciprocal shaker converts rotary motor motion into linear motion with a crank and slider or an eccentric link, so the platform moves back and forth along one axis. Stroke length is set by the crank radius and typically ranges from 10 to 50 mm, while speed is set in strokes per minute from about 20 to 300. The back-and-forth movement creates shear at the liquid surface and along the vessel wall, which helps with washing, extraction and mixing of viscous samples where orbital motion alone is too gentle. A guide rail or linear bearing keeps the platform straight, and a counterweight or dual-opposed platform reduces vibration. Closed-loop control holds speed against load, timers run the cycle, and clamps or trays secure vessels so they do not slide with the motion.
Which Reciprocal Shakers variants are available?
- Benchtop Reciprocating Shaker — A benchtop reciprocating shaker is a compact linear-motion unit for routine washing, extraction and staining.
- Digital Reciprocating Shaker — A digital reciprocating shaker sets and holds stroke frequency and time precisely with a microprocessor controller.
- Adjustable-Stroke Reciprocating Shaker — An adjustable-stroke reciprocating shaker lets the operator change stroke length as well as speed for different methods.
- Heavy-Duty Reciprocating Shaker — A heavy-duty reciprocating shaker drives large loads continuously with reinforced guides and strong bearings.
- Large-Capacity Reciprocating Shaker — A large-capacity reciprocating shaker provides a wide platform for many trays, racks or vessels in one run.
How do I choose the right variant?
Choose a reciprocal shaker when linear shear is wanted rather than swirling, as in washing, extraction, staining and some homogenization steps. Set the stroke length from the vessel and the shear needed, since longer strokes move the liquid more but can splash, and set the speed from the method. Match the platform and clamps to the vessels, and the load rating to the total mass at the chosen speed. Decide between a single and an opposed dual platform, where the second platform balances the first and reduces vibration. Confirm the duty cycle for long runs, and specify the timer, soft start and power supply.
Where are Reciprocal Shakers used?
Reciprocal Shakers are specified in washing and rinsing of samples, liquid-liquid and solid-liquid extraction, staining and destaining procedures, mixing of viscous or high-solids samples, elution and washing in assays and soil and waste extraction.
Which standards and certifications apply?
Work with Reciprocal Shakers is commonly governed by IEC 61010-1, IEC 61010-2-051 and ISO 9001. Instrument certifications such as CE marking are confirmed per configuration and never assumed.
What are the key considerations before purchase?
Clamp or tray every vessel so it cannot slide with the reciprocating motion, and load the platform symmetrically to reduce vibration. Place the unit on a level, rigid surface with clearance for the moving platform, since reciprocal action can transmit vibration to the bench. Stay within the load rating at the working stroke and speed, and use a soft start or lower speed when vessels are full. Clean spills promptly to protect the rails and clamps. Lubricate or inspect the linear bearings and guides on schedule, check belts and fasteners for wear, and replace worn clamps that no longer hold vessels firmly.
