Connection Point (for Pitman/Eccentric Rod): Component Specs, Materials & Applications

Component Specifications

Definition

The Connection Point for Pitman/Eccentric Rod is a critical interface component in ram/slide assemblies, designed to convert rotary motion from the pitman or eccentric rod into linear motion of the ram. It features precisely machined bearing surfaces, alignment features, and fastening mechanisms to ensure minimal play and accurate force transmission under high cyclic loads. This component maintains the kinematic relationship between the driving mechanism and the driven ram, directly impacting machine precision, stroke consistency, and operational reliability.

Working Principle

The connection point operates on the principle of constrained kinematic linkage. It provides a pivot or sliding interface that allows the pitman/eccentric rod's oscillating or rotating motion to be transferred to the ram/slide with controlled degrees of freedom. The design ensures that motion transfer occurs with minimal backlash and deflection, maintaining the geometric relationship between input and output motions as defined by the machine's kinematics. Proper lubrication and wear management at this interface are essential for maintaining motion accuracy over the component's service life.

Materials

Typically manufactured from alloy steels (e.g., AISI 4140, 4340) or case-hardened steels for wear resistance. High-load applications may use forged components with surface treatments like nitriding, carburizing, or induction hardening. Bearing surfaces often incorporate bronze bushings or polymer composites for reduced friction. Corrosion-resistant coatings or stainless steel variants are used in specific environments.

Technical Parameters

Parameter	Typical range	Notes & selection driver
Load Capacity	10-500 kN (depending on machine size)
Surface Finish	Ra 0.8-1.6 μm (critical surfaces)
Connection Type	Pinned, Bolted, or Keyed
Surface Hardness	45-60 HRC (bearing surfaces)
Dimensional Tolerance	IT7-IT8
Operating Temperature	-20°C to 150°C
Lubrication Requirement	Grease or oil lubrication points

Ranges are indicative industry figures for RFQ preparation, not a supplier commitment. Confirm every value and standard with the legal manufacturer before ordering.

Standards

ISO 286-1, ISO 2768-1, DIN 7184, DIN 7190

Parent Products

This component is used in the following industrial products

Ram/Slide Assembly

The reciprocating component that delivers the stamping force through the tooling to the workpiece in a progressive stamping press.

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Engineering Analysis

Risks & Mitigation

Wear-induced backlash affecting precision
Fatigue failure under cyclic loading
Misalignment causing binding or uneven wear
Corrosion in humid or chemical environments
Improper lubrication leading to seizure

FMEA Triads

Trigger: Insufficient lubrication
Failure: Increased friction, overheating, and eventual seizure
Mitigation: Implement automated lubrication systems, use high-temperature greases, establish regular lubrication schedules

Trigger: Cyclic loading beyond design limits
Failure: Fatigue cracking at stress concentration points
Mitigation: Redesign with improved fillet radii, use higher fatigue-strength materials, implement load monitoring systems

Trigger: Environmental contamination
Failure: Abrasive wear and corrosion
Mitigation: Install protective seals, use corrosion-resistant materials, implement regular cleaning protocols

Industrial Ecosystem

Compatible With

Typical Suppliers & Equivalents

Compliance & Inspection

Tolerance

Dimensional tolerances per ISO 286-1 for fits, geometric tolerances per ISO 1101 for alignment

Test Method

Dimensional verification with CMM, hardness testing per ISO 6508, non-destructive testing (ultrasonic or magnetic particle) for crack detection, functional testing under simulated load conditions

Procurement Evaluation Criteria

A practical evidence checklist for RFQ preparation and supplier evaluation.

Technical documentation

Request current drawings, revision history, and a signed specification sheet.

Manufacturing capability

Verify equipment lists, process limits, capacity, and representative production evidence.

Inspection readiness

Confirm test methods, calibrated equipment, sampling plans, and traceable reports.

Supplier transparency

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Manufacturers of Connection Point (for Pitman/Eccentric Rod)

Manufacturer profiles associated with Connection Point (for Pitman/Eccentric Rod).

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Compiled and source-reviewed by the CNFX editorial team. Each manufacturer above links to the page on that company's own website where the product is listed, with the date we checked it. How we source and review

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Frequently Asked Questions

What is the primary function of the connection point in a ram/slide assembly?

The connection point transfers motion from the pitman or eccentric rod to the ram, converting rotary/oscillating input into precise linear output motion while maintaining alignment and minimizing backlash.

How often should connection points be inspected and maintained?

Inspect during routine maintenance cycles (typically every 500-1000 operating hours). Check for wear, alignment, lubrication, and fastener tightness. Replace worn components immediately to prevent machine damage.

What are common failure modes of connection points?

Common failures include wear at bearing surfaces, fatigue cracking at stress concentrations, loosening of fasteners, corrosion in harsh environments, and misalignment due to improper installation or foundation issues.

Data Basis

Editorial classification, named public sources where available, and source-reviewed manufacturer records. See the editorial policy.

Preliminary Technical Classification

This page supports structured research, RFQ preparation, and supplier evaluation. It does not replace buyer-led supplier qualification, standards review, or technical approval.

Connection Point (for Pitman/Eccentric Rod)