Windpower Engineering & Development

  • Home
  • Articles
    • Most recent posts
    • News
    • Featured
  • Leadership
    • 2020 Winners
    • 2019 Winners
    • 2018 Winners
  • Resources
    • Digital issues
    • Podcasts
    • Suppliers
    • Wind Farm Map
    • Wind Turbine Selector Tool
    • Wind Power Videos
    • Webinars
    • Wind Power Events
  • Webinars
  • Videos
  • Subscribe
    • Magazine Subscription
    • Enewsletter Subscription
  • About Us

A better way to tighten and check many bolts

By Paul Dvorak | February 20, 2014

The E-RAD series comes in eight models with torque ratings from 100 to 7,500 ft-lb. WPE

The E-RAD series comes in eight models with torque ratings from 100 to 7,500 ft-lb. WPE

Chris McKerihen

Author Chris McKerihen

Chris McKerihen / EIT Design Engineer /Rad Torque Systems / www.radtorque.com

It’s necessary to re-torque a wind turbine’s bolts at OEM prescribed intervals because bolts occasionally work themselves loose. Several hundred of them may need checking on a typical utility-scale turbine. Recent electric wrenches provide a more efficient tool for that task. One version from our company comes with several advantages over other torquing techniques.

The E-RAD series of wrenches provides a fast, reliable, and safe way for installing and removing heavy duty fasteners. The company adds that the tools are lighter, faster, stronger, and more accurate than conventional bolting tools. For instance, compared to hydraulic wrenches, the electric tool significantly decreases tightening times through the delivery of smooth and continuous torque. The relatively low weight of the tool comes in part from its patented planetary gearbox combined with an ergonomic design. The two features provide the highest power-to-weight ratio, controlled bolting system on the market.

Tests show that the servo control shuts off at required torque with an accuracy of ±3% and a repeatability of ±2%. Conventional methods often determine bolt torque by monitoring a pressure gauge, which makes accuracy unreliable.

Tool operation has been simplified in the E-RAD. A user would digitally enter a required torque and angle (rotation the socket head must turn after reaching a particular torque value) and press the trigger. The tool runs and shuts off at the required setting. An LED light on the wrench provides an indicator telling users the tool has met the required torque.

                        A few electric wrench specs

Bolting tableHow does it work? The electric wrench uses an ac servo, brushless motor while an internal CPU stores a torque-verses-current calibration curve. When the motor reaches a required torque – identified by electrical current – controls shut the motor off. To control the application of the additional angle, the wrench’s ac servo motor drives an encoder which tracks and records 4,096 points on a 360 degree rotation of the motor drive.

Each electric wrench from the company is equipped with a controller case to provide the user-machine interface. A touch screen allows for adjustments to torque and angle. Digital-data collection allows for full traceability of each torque sequence which also creates computer reports.

Tell Us What You Think! Cancel reply

Related Articles Read More >

Offshore and land-based wind training center opens in Maryland
200-MW East Raymond wind project now powering homes in Austin, Texas region
IEA awarded construction contract for 118-MW Illinois wind farm
RWE Renewables completes first Oklahoma wind farm with 148-MW Boiling Springs project

Windpower Engineering & Development Digital Edition

Digital Edition

Browse the most current issue of Windpower Engineering & Development and back issues in an easy to use high quality format. Clip, share and download with the leading wind power engineering magazine today.

Webinars
Windpower Engineering & Development
  • Wind Articles
  • Subscribe to Windpower Engineering
  • Advertising
  • Contact Us/About Us

Copyright © 2021 WTWH Media, LLC. All Rights Reserved. Site Map | Privacy Policy | RSS

Search Windpower Power Engineering & Development

  • Home
  • Articles
    • Most recent posts
    • News
    • Featured
  • Leadership
    • 2020 Winners
    • 2019 Winners
    • 2018 Winners
  • Resources
    • Digital issues
    • Podcasts
    • Suppliers
    • Wind Farm Map
    • Wind Turbine Selector Tool
    • Wind Power Videos
    • Webinars
    • Wind Power Events
  • Webinars
  • Videos
  • Subscribe
    • Magazine Subscription
    • Enewsletter Subscription
  • About Us