CUTTING TIMES

   Criterion is a firm believer that the best way to ensure our American way of life is in the proper education of our children. This is why we believe in assisting educational institutions with tooling know how.
    One School in particular is most gratifying in their approach to teaching metal working to students. That school is Newburg (Oregon) High School. We at Criterion are quite proud to have contributed to their success as they walked off with the nation's top prize at the student Robotic Challenge in Saginaw, Michigan.
    Beating Out More than 100 entries from high schools and colleges around the nation, they were one of the few schools that built their robot from scratch instead of using a kit. Newburg High School metal-shop instructor Terry Cross stated, "I think I am one of the few traditional metal shop teachers left in the state. I don't know where the public thinks future engineers and skilled craftsmen are going to get real hands on experiences."
    Part machine shop, part high tech computer center, Cross' classroom is a beehive of activity from early morning to late afternoon. This didn't hurt his standing with the school officials, as the school offers a certificate of advanced mastery in industry and engineering.
    Frank McDougall, our Customer Service Manager, coordinated the donation of our products to the school. We received a wonderful letter from terry Cross, whereby he wrote, "Thank you for the wonderful gifts, we will treat them like precious metal." In my books, the Newburg school district has a precious instructor for the community's children. Treat, because he is a rarity.

Criterion is showing three new tool products at WESTEC 2000, Los Angeles Convention Center, March 20 - 23, booth #2662. Criterion manufactures one of the most complete lines of boring heads, tools, shanks and adapters available. As a manufacturer of machine tool accessories for over 60 years, Criterion products have become the standard by which others are measured.

Gary Vanderpol, President of Criterion Machine Works, Stated that Criterion's new line of micro grain boring tools and inserts will be featured at WESTEC. Micro grain metals offer considerable advantages during finishing operations. Vanderpol commented that micro grain materials are submicron in size to allow tools to have a sharper edge that holds up longer.

These 10% cobalt based materials are superior for finishing operations and the boring tools come in six different sizes.

Tool No.	Min. Bore Diameter	Overall Length	Max. Boring Depth	Shank Diameter
MGBT-125B	1/8"	1 - 7/8"	1/2"	1/2"
MGBT-187B	3/16"	2 - 5/32"	13/16"
MGBT-250B	1/4"	2 - 15/32"	1-1/8"
MGBT-312B	5/16"	2 - 13/15"	1-1/2"
MGBT-375B	3/8"	3 - 3/16"	1-3/4"
MGBT-500B	1/2"	3 - 1/2"	2-3/16"

The micro grain boring tools are intended primarily for use with Criterion boring heads. However, they can also be used in engine lathes, turret lathes and automatics. They are equally adaptable in machines where the tool - or the work - turns.

In addition to a series of boring tools, Criterion is introducing four of their most popular indexable inserts in micro grain material. The .250 I.C. TPGW-2(1.50)0 and TPGT-2(1.5)1-2C, and the .375 I.C. TPGW-320 and TPGT-321-2C will be introduce at WESTEC.

Criterion will be offering a line of heavy metal boring bars, which greatly enhance boring applications by absorbing vibration and drastically reducing chatter. This enables the machining of deeper bores with greater precision and finish.
Criterion's heavy metal boring bars are manufactured from a sintered alloys of 95% tungsten with a nickel-copper-iron matrix. These alloys are quite similar to tungsten-carbides, but the chemical composition was developed differently to reduce embrittlement. The high density (twice differently to reduce embrittlement. The high density (twice as heavy as steel) and tensile strength (100 kpsi) of this alloy makes it the ideal combination for chatter free boring bars.

Boring Tools:
A Key Element In Maintenance Overhaul & Repair
By Henry Ohlinger, President Ohlinger Industries Inc. Phoenix, AZ

As a manufacturer of precision machined parts and accessories for over 50 years, Ohlinger Industries Inc. has developed a widely recognized leadership position in the aerospace overhaul and repair (O & R) industry. Ohlinger Industries was founded in 1963 from sturdy roots dating back to the Vernon tool Company of Arizona. 1941. After many years of producing new parts and assemblies for the aerospace industry, Ohlinger Industries has also become a specialist in overhaul and repair. The company has been accepted by the Joint Aviation Authorities as an approved source of maintenance for JAA Member Authority controlled aircraft components and has been issued an "Air Agency Certificate" by the FAA, as well as being recognized as an authorized component repair facility by AlliedSignal Aerospace. State-of-the-art CAD and CAM system, machines, manufacturing processes, as well as tooling, have been instrumental in the company maintaining its high reputation in the aerospace O & R industry.

Ohlinger specializes in the overhaul and repair of pumps and gear boxes. Accordingly, the overhaul of pumps is a specialty in itself. Many components have wear areas that can be built up or sleeved and re-machined. Additionally, epoxy repairs or the pump bores, re-plating, painting and complete inspection services are performed at the Ohlinger facility.
Some 80 highly skilled employees keep the 35,000 sq. ft. facility humming with activity. Cincinnati, Hiachi Seiki, Landis, Kearney & Trecker, Schwartzkopff, etc. are but a few of the familiar equipment names seen on a walk-through of the Ohlinger facility. Over 75 machines including jig bores, mills, lathes, grinders and many others are at work to complete projects on time. Additionally, Ohlinger has AutoCAD and SmartCAM for engineering and CNC programming, as well as complete deburring, hand finishing operations, masking, painting, chemical conversion coatings and finishes, and hydro-static and air pressure testing.

We appreciate good tooling. The Vetcoa Rotary Threader was invented and manufactured under our previous corporate name of Vernon Tool Company of Arizona. The threader is used with any standard vertical milling machine and employs vertical positioning of the master lead screw. This approach to threading is both economical and amazingly fast even on the toughest metals. Even today, we still make the necessary cutters for the many units that are still out in the field.
With our own in-house tool makers, we are very selective of the boring tools we use in our various machine tools. Throughout the shop, one will find Criterion boring heads and bars including the largest boring head in the Criterion line, the DBL-206F. This extra heavy duty head was designed for boring holes up to 17 inches in diameter with the use of a sturdy 1-1/2 inch diameter boring bar in the cross-hole. Almost every mill, jig bore and machining center in the shop has a half dozen or even more or the Criterion heads.

A complete selection of Criterion boring heads and bars are found at each machine.

Aerospace projects involve close tolerance works and demand the very best in tools, machines and materials. this is especially true in the field of precision boring, and it is precisely why in some cases we use Criterion's "tenth adjusting boring heads". These heads feature two micrometer adjusting screws allowing adjustments down to .00005 for the special jobs demanding absolute size control. Its 50 millionths movement is accomplished by using a unique sliding wedge concept. this design allows the accurate and consistent adjustment in increments of .0001 on the bore diameter.

    Because Ohlinger repairs and overhauls aerospace parts, all facets of Ohlinger's operation conform to some governmental rule or regulation. All production requires the close tolerances and precision characteristics of the aerospace industries. Ohlinger's quality assurance staff performs incoming floor, first article and final inspections. This includes extensive non-destruction testing such as magnetic particle inspection and Zyglo dye penetrant inspection. In addition to a full complement of inspection blocks, gages, micrometers, etc., we also have two CMMs and a borescope.
    Because the company was initially involved in the tool business, we are very particular about our boring bars and other cutting tools. We have a full-time tool machinist and each machine has its own set of boring and cutting tools. It is the responsibility of each machinist to keep track of his tools and if maintenance is required, the tools are turned over to the tool room machinist for resharpening.
    While having the most modern and reliable equipment necessary to do the job, equally if not more important is the personnel. A team of overhaul experts takes years of dedication to assemble and train. We pride ourselves on the length of service our employees have, which we believe has given us a positive worldwide reputation in the aerospace industry.

Because of the precision requirements of the aerospace industry, Ohlinger uses Criterion's "tenth adjusting boring heads", which allows adjustments down .00005.

Chip Talk:
Adjusting Boring Heads
By Randy Cloud, Manufacturing Engineer Criterion Machine Works

Criterion Prides itself on the quality and endurance of our products. However, we know that customers may lose the instruction sheet or have problems or questions. An area that comes up from time to time is the adjustment of boring heads.

DBL Style Boring Head
1. Bar Holder
2. Body
3. Dial Screw
4. Set Screws (Bar Holder)
5. Gib Screws
6. Gib Lock Screw

   Our adjustable boring heads have three main parts; chrome dial screw, chrome bar holder, and the black body. the body contains the gib and three socket head set screws to adjust and lock the gib. The two outside set screws are for gib adjustment and are preset at the factory.
    The center screw is the lock screw. In normal operations the machinist would loosen the center lock screw, make an adjustment with the dial screw, and then lock the center screw. The 2 outside screws are normally set so that the gib applies enough pressure to keep the bar holder from moving when the lock screw is loosened. Please note that even though the dial screw threads are class 3 and the web tolerance (the interface between the bar holder and the dial screw) is held to .0005" there is an accumulation of tolerance. this would allow the bar holder to "chuckle" slightly, thereby changing the bore diameter without the user's intervention when the lock screw is loosened.
    To prevent this, the factory adjusted pressure on the gib (and thereby the bar holder) is just enough to feel some "drag" when turning the dial screw. The user can readjust this "snugness" by first loosening all three screws, then while slowly turning the dial screw (back and forth is O.K.) adjust first one outside screw until slight drag is felt, then adjust the other outside screw until slightly more drag is felt.
    Since there is some backlash caused by the accumulation of tolerance, when adjusting to a smaller diameter the user must "back-off" the bar holder (just like on an engine or turret lathe) and then come back to the desired size.
    There are times when a user may desire to tighten all three screws after each adjustment. This is doable and will not harm the head. To adjust the head in this scenario, the user would first loosen and the re-snug each outside screw to prevent the bar holder from moving, Then unlock the center screw, make the desired adjustment, and retighten all three set screws.
    If you have any application questions about our product line please don't hesitate to call and ask for technical help.