Okamoto Total Grinding Solutions
Published

Fixturing Device Simplifies Squaring

Peter Schmidt of the Hermann Schmidt Company developed a intuitive fixture for squaring blocks for the die and mold industry. The system interfaces well with components from the System 3R catalog and is capable of making a block square within millionths of an inch.

Share

Accurately squaring mold and die blocks is a fundamental task in the die and moldmaking industries. Every block in a die touches and/or is surrounded by other blocks, so their size and squareness influence overall die accuracy. In a mold, block accuracy is even more of a concern because the mold may have as many as 256 exact copies of the same block. It is important to be able to remove one block that needs polishing and replace it with an exact copy to allow the molding machine to keep running.
    For years, machinists have squared blocks with a solid square, a vise and a knee mill. After heat treatment, block squaring is often completed on a grinder using a trusted angle square and a C clamp. Unfortunately, shops face challenges with increased offshore competition and a lack of skilled machinists capable of accurately performing this type of work. That’s why they’ve tried to develop fixtures that make the squaring process simpler and more accurate. The problem with most of these fixturing solutions is that they are complicated and don’t yield the needed accuracies.
    Peter Schmidt of Hermann Schmidt Co. has developed a solution designed to overcome these challenges and take the guesswork out of block squaring. Mr. Schmidt says the solution is easy to operate and yields accurate results using machines found in the average shop. The device, called SquareTech, is produced and sold by System 3R USA Inc. (Elk Grove Village, Illinois).
    SquareTech has two primary components: a base and an indexing fixture. The base can be bolted to a mill’s T-slot table or to a flat plate for attachment to a magnetic grinding chuck. The indexing fixture has a circular profile that slides into the base. It is located and locked into the base with a precision ring around its periphery. That ring engages another ring of ball bearings located inside the base to lock precisely and rigidly regardless of the fixture’s rotation angle. The ball-bearing ring is constantly engaged via spring pressure regardless of whether the indexing fixture is present in the base or not. The indexing fixture can be removed from the base by using shop air. Air pressure applied through a control valve in the base overcomes the spring pressure. The ball bearings then recede into the base to allow the indexing fixture to spin freely.

    The indexing fixture is compatible with many workpiece interfaces using components from System 3R.The SquareTech system accurately indexes parts as heavy as 200 pounds every 90 degrees. A test was recently performed at a customer site using the SquareTech system to grind a block made of D-2 tool steel. The flat grinding machine used for the test was in good condition and was located in a facility with an ambient temperature of 71° F. The part was checked with certified gages on a recently certified grade-A surface plate. In preparation for the test, the top and bottom surfaces of the block were ground parallel. The block was then attached to the indexing fixture with a standard electromagnet to provide access to the remaining four sides. Each side was ground in succession until the block had made five revolutions, with each side being ground five times. This test yielded a cube with total squareness error of less than 0.000060 inch.


Okamoto Total Grinding Solutions
Koma Precision
MMS Made in the USA
PMTS 2025 Register Now!
715 Series - 5-axis complete machining
More blasting. Less part handling.
VERISURF
Paperless Parts
Innovative Manufacturing for the Medical Industry
QualiChem Metalworking Fluids
Hurco
IMTS+

Related Content

CAD/CAM

Fearless Five-Axis Programming Fosters Shop Growth

Reinvestment in automation has spurred KCS Advanced Machining Service’s growth from prototyping to low-and mid-volume parts. The key to its success? A young staff of talented programmers. 

Read More
Automation

Inside the Premium Machine Shop Making Fasteners

AMPG can’t help but take risks — its management doesn’t know how to run machines. But these risks have enabled it to become a runaway success in its market.

Read More
Sponsored

High RPM Spindles: 5 Advantages for 5-axis CNC Machines

Explore five crucial ways equipping 5-axis CNC machines with Air Turbine Spindles® can achieve the speeds necessary to overcome manufacturing challenges.

Read More

Ballbar Testing Benefits Low-Volume Manufacturing

Thanks to ballbar testing with a Renishaw QC20-W, the Autodesk Technology Centers now have more confidence in their machine tools.

Read More

Read Next

Grinding

In It For The Long Haul

Curt Reed uses advanced grinding techniques in the pursuit of short-run, sub-micron work that other shops can’t perform or won’t attempt. His shop’s commitment to its customers is reflected in the high level of equipment sophistication and applied grinding acumen.

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

5 Rules of Thumb for Buying CNC Machine Tools

Use these tips to carefully plan your machine tool purchases and to avoid regretting your decision later.

Read More
Okamoto Total Grinding Solutions