Made in Beverly Hills

When a company is 76 years old it will have many interesting stories. One of our stories comes from a trade show attendee who stop by our booth. He brought a boring head that Criterion had made when the company was located in Beverly Hills, California. He was kind enough to give us the boring head shown below so we could add it to our display case of Criterion Boring Heads.

1940's Criterion Boring Head on Moore Jig Bore Shank

This is his story about the history of the boring head. His grandfather purchased the boring head from Criterion in the late 1940's (he was not sure of the exact year) and used it in his job shop for many years. His grandfather then sold the business to his dad who continued using the boring head. His dad then sold him the shop and he continued to used it because it still produced accurate bores. He decided to retire the boring head and purchasing a new Criterion Boring head. He knew we were going to be at the show and thought we might like to have a piece of our history. 

60+ Years of Service in Manufacturing

This boring head has been owned by three generations of a manufacturing family. It is a tribute to not only Criterion but another family business that has survived for three generations. Criterion has always been proud of the quality and durability of the products we produce. We appreciate the loyalty of our customers and hope they continue to use Criterion's products for generations to come.

Reduce Tool Change Over Time

One of our main objectives is to provide products and solutions for our customers that will save them money and reduce their cost of manufacturing. Shortly after introducing the 1/8" solid carbide tools we introduced the “QL” boring tool to our line of solid carbide boring tools.

These .125" diameter solid carbide qualified length boring tools feature a repeatable “Z” length of +.001" /-.001" from a nominal set length. The QL tool’s close tolerance length minimizes a machine’s down time when you have to change a tool during production run.  

When a tool needs to be replaced you loosen the collet nut remove the damaged tool, insert the replacement tool, rotate it until it falls into place. The tools closely held locating angle insure the “Z” length repeatability. The locating angle also places the cutting edge on center giving longer tool life and reducing machine down time.

Criterion's Qualified Length Tools and Qualified Length Adapters

There are 17 different bore diameter and length configurations of the new .125" solid carbide qualified length boring tools. Minimum bore diameters will range from as small as .050" to as large as .110" in diameter. The boring tools are able to bore holes up to .700" in depth depending on the bore diameter.

The qualified length tools need to be held in a Criterion qualified length tool holder. The tool holders are available with 1/4", 3/8", 1/2", 5/8" and 3/4" shanks and are design for use in Criterion’s precision boring heads.

Expand Your Boring Head Range with the Right Solid Carbide Boring Tools

Solid carbide boring tools have been around for many years. The number of manufacturers that make small diameter solid carbide boring bars that are not ground on center is limited. When Criterion introduced our TMT-0750 small boring head we looking at the small carbide bars on the market and they were not designed to be used with the boring head. We did not find anyone who was making a tool ground on around the center line of the tool shank. All of the tools were designed to be used in lathe applications and were ground off center for maximum clearance in the lathe.

The reason this is important if you are going to use it in a boring head is the loss of diameter range on the boring head. You have to move your boring head offset just to bring the tool on center. This can be as much as 3/16 of an inch if the boring tool has a .030" minimum bore and the shank is 1/8". You would effectively lose 1/2 of the adjusting range of the boring head in this example.

1/4" Shank Carbide Tools Design for use in Boring Heads

Because of this Criterion introduced a line of 1/8" shank and 1/4" shank solid carbide boring tools and adapter sleeve for use in our boring heads. Our tools are ground around the centerline of the tool shank so you minimum offset to bring the tool its smallest bore diameter. This gives you the maximum off-set possible with the boring head. Being able to take advantage of the offset means you need less boring tools in inventory.