Workholding from Mate Precision Technologies
Published

A Study Of The Steady Rest

When the length and stiffness of a workpiece make it difficult to machine, many turn to the steady rest.

Share

When the length and stiffness of a workpiece make it difficult to machine without distorting or deflecting the part, many manufacturers turn to the steady rest as a workpiece support device. This is especially true for long axles, shafts and similar parts used in automotive or heavy equipment applications, and in oil drilling components. The most common application is to support a workpiece during turning or milling and, increasingly, during secondary operations such as ID drilling, boring and producing end face bolthole patterns.

Edward J. Peter of LNS America, Inc. (Cincinnati, Ohio) has more than 27 years of experience in the application and design of steady rests. He offers the following points to consider when selecting the appropriate steady rest:

1. Structural attributes

Be certain the materials used and the overall design ensure precise, reliable performance. For example, the arms must be wide and sturdy enough to properly support the workpiece but also allow ample tool clearance.

2. Manual versus automatic positioning

A manual steady rest requires individual adjusting of each point that contacts a workpiece. Automatic steady rests are self-centering and use hydraulics or pneumatics to clamp and unclamp parts. These systems have integrated cylinders that may be actuated by machine control M codes or by manually operated switches.

3. Size

The steady rests must fit in the machine without interfering with the doors, cross-slide cutting tools and sheet metal guards. Some suppliers can provide custom designs and configurations, such as narrow arms and side mounted cylinders, that permit additional clearance in the machine tool.

4. Lubrication

An automatic lubricating system is generally a better long-term solution than a manual system. Make sure the lubrication system is programmable and capable of lubricating all working parts, including the roller bearings, at recommended intervals.

5. Protection against contamination

Look for a pressurized, sealed construction that keeps harmful contaminants out. Some steady rests offer additional protection through an integrated inlet that allows air pressure to purge impurities from the unit.

6. Applications expertise

Determining the size, placement and number of steady rests is critical. An experienced supplier can help. The key factors to consider are part length, weight, diameter, material composition and the kind of machining operations being performed.

7. Design integration

Design software with 3D modeling capability allows a supplier to design a system that combines the steady rest, automatic clamp base, brackets, tubing, valves, hose track assemblies, electrical connections to the machine control and even way covers if required.

8. Mounting

It is important to mount the steady rest for maximum machining efficiency. It is also critical to consider part loading and unloading, how the rest will affect the operating range of the machine tool and if custom way covers or other modifications are needed. Common machine tool mounting locations include:

  • Tailstock ways (traditional boxed style ways or newer linear ways)
  • Cross slide
  • Lower turret of a four-axis machine (fixed, or using a rotary coupling to allow remaining tool positions to be used)

9. Special considerations for machines with linear ways

The steady rest brackets and bases must be mounted on bearing blocks that fit the machine tool’s existing linear rails, and there must be a manual or automatic method devised to clamp the brackets and bases to the linear rails after they are moved into position. In a manual installation, the operator moves the steady rest and then uses a switch to hydraulically clamp the workpiece. An automatic system uses M codes to locate the steady rest and hydraulically clamp the base to the rail. When installing a steady rest on a linear way machine, the original equipment guards may need to be modified, and it is often necessary to create telescoping way covers to protect the linear rails and the machine tool ballscrew.

10. Safety

To safeguard the operator and the machine, designers may use positioning switches, pressure switches, timers, sensors and machine control interfaces.

Mate Workholding - Accuracy and Repeatability
VERISURF
World Machine Tool Survey
PMTS 2025 Register Now!
DN Solutions
Hurco
SolidCAM
KraussMaffei
Techspex
715 Series - 5-axis complete machining
Innovative Manufacturing for the Medical Industry
Koma Precision

Related Content

Workholding

Chuck Jaws Achieve 77% Weight Reduction Through 3D Printing

Alpha Precision Group (APG) has developed an innovative workholding design for faster spindle speeds through sinter-based additive manufacturing.

Read More
Turn/Mill

Custom Workholding Shaves Days From Medical Part Setup Times

Custom workholding enabled Resolve Surgical Technologies to place all sizes of one trauma part onto a single machine — and cut days from the setup times. 

Read More
Automation

Using Automation to Reduce COGS and Stay Globally Competitive

Decade-long, multiphase automation investments lower operating costs and maintain technology lead in an increasingly competitive global market.

Read More
Automation

Shop Doubles Sales with High-Mix, Low-Volume Automation

Robots with adaptive grippers have opened entire shifts of capacity to high-mix, low-volume shop Précinov, doubling its sales.

Read More

Read Next

Turning Machines

Sometimes the Trickiest Part of CNC Machining Is Holding the Part

Finding a way to fixture contoured marine propellors proved to be this shop’s biggest challenge in developing an effective automated machining cell.

Read More
Toolholders

Rego-Fix’s Center for Machining Excellence Promotes Collaboration

The new space includes a showroom, office spaces and an auditorium that will enhance its work with its technical partners.

Read More

Registration Now Open for the Precision Machining Technology Show (PMTS) 2025

The precision machining industry’s premier event returns to Cleveland, OH, April 1-3.   

Read More
Mate Workholding - No Interruptions or Surprises