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44 Year
AirGraver History

















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44 years - AirGraver History
by Steve Lindsay

The AirGraver tools are a culmination of 44 years of engraving and tool making by Frank and Steve Lindsay.  In 1975, at the age of 17, Steve began to learn hand engraving with his father who is a watchmaker and jeweler.  Frank became friends with John Rohner and James (Bruce) Meeks. At that time he purchased John Rohner's invention called a Gravermeister from John in Boulder Colorado. John's invention was the world's first pneumatic engraver.  John Rohner was a supporter encouraging Steve to continue learning.  Above is a book John signed in 1977 which was an inspiration to Steve during that time.

In 1977, after graduating from high school, Steve enrolled in the same Nebraska tech college that his father attended studying watch making.  Steve enrolled in machine tool and die on the recommendation of John Rohner.  The college and super instructors (i.e. Alan Carter) allowed students to use the school's machine shop for personal projects in the evening. Taking that opportunity, Steve created several new hand pieces for the Graermeister that he was using. The new hand pieces were palm-sized rather than long. This was beneficial for smaller, detailed engraving as well as providing improved control.  In 1979,  Frank designed an electronic circuit to oscillate and adjust the speed of a solenoid valve. Air was run through the valve to produce blow-pulses rather than suction-pulses. Frank made two of the machines.  Steve used the school's machines to build various hand pieces for this adjustable positive pulse generator.  In an interview for the December, 1981 NebraskaLand magazine, Frank's machine was mentioned and a picture of it can be seen on the back corner of the engraving bench on page five of the article. NEBRASKAland.pdf  It is the gray box in the right back corner of the bench.  The hand pieces hidden for the article and from the public for years.  At the left is a picture of three positive pulse hand gravers made in 1979 for Frank's machine. 

After machine tool & die school, Steve continued to engrave by day while working second shift in the tool room of a Nebraska manufacturer. After regular hours there, he used their machine tools and continued to refine engraving tools. He also made two positioning vises for his father and himself for engraving under The diamond scopes used in the jewelry store.  In 1980 after the tools were refined and efficient, Steve quit the job and began full time engraving. Another friend of Frank's, Lynton McKenzie, recommended Steve attend the knife makers' guild show in Kansas City in 1980.  He took the top side of this linked 9mm Browning to the show. Lynton was at the show and took him from table to table to introduce him to knife makers and his collectors. Knife markers such as Buster Warenski, Steve Johnson, Steve Hoel, Ron Lake, Jim Hardenbrook and Jim Ence. were at the show.  From those introductions, knife makers and collectors gave Steve engraving jobs. (some can be seen at www.LindsayEngraving.com ). For the next few years, Frank made more improved hand pieces with his lathes and milling machines that Steve then used for his engravings.  In 1984 or 1985 James Meeks came by to say hello and visit.  He was working on his second book then and brought along many white plastic plates. He explained the surface was white but when cut into, the lines showed black. He had engraved them with various scrolls and example designs. He explained he was engraving this plastic because the engraving would photograph well for the book. After that visit Don Glaser Sr. called and said that Meeks really enjoyed seeing the palm sized graver. It was an awkward phone call because Steve did not show Meeks his hand piece during his visit.  Steve did receive a phone call while Meeks was visiting and he was left alone at the bench for a short time.  He must have found the hand piece.  It was interesting because after that Mr. Glaser brought out a new smaller hand piece that had a plastic mushroom handle on the butt, unlike the hand pieces they were making that were long and straight with a  handle midway rather than at the end.  It did not matter since Steve was not in the tool business at that time, but only engraving for collectors.  In 1987 Frank and Steve did some engraving projects together. They produced five engraved folding knives. Steve drew the outlines of the knife designs and Frank made and set the diamonds, and Steve then engraved them.  Frank's knives had hidden watch screws and wedges and would come apart allowing the inside surfaces as well as the outside ones to be engraved.  The five pieces were called Lindsay-Lindsay. The Japanese knife engraving market was strong then and several of them went to customers and dealers in Japan selling for as much as $40,000.  Later the owner of the #5 piece contacted Steve with the news that he had a terminal illness and wanted to sell and was asking $110,000. It was offered for sale on the LindsayEngraving.com site and was resold.

Lynton Mckenzie and Steve engraved a SCI  Safari Club International rifle project together.  David Miller was the maker, Lynton engraved the rifle and Steve did the accessories and a Steve Hoel folding knife that were cased with the rifle.   The piece sold at auction for $210,000.  

Lynton had also  been engraving Gene Clark's watches.  When Lynton became sick in early 1998 he recommended to Gene that Steve engrave them.  Steve engraved three of Gene's watches.  An improved AirGraver design was completed while working on the second one. That second one was auctioned at Sotherby's and sold for $62,500.   LindSayengraving.com/Clark.htm Through the years the AirGraver continued to be improved.  There is a video of one of Gene's watch faces being engraved in the above link.



Various Lindsay AirGraver designs.  

1.  A Lindsay self oscillation AirGraver piston principle was patented. It can operate with very little air pressure or air volume. In fact, by simply blowing in it.  Even attached to a toy balloon, the tool will idle. Instead of a spring for the return or impact stroke, the device uses air pressure for both directions. As a result, the piston always stays balanced and low or high air pressures can be used without one side overpowering the other causing the piston to float, which can occur with the spring-pulse designs. The patented idle of the new design prevents jumps that sometimes occur with spring-pulse designs. The stroke length and speed adjustment is in the bore of tool. Adjustment is made by removing the graver and adjusting the screw at the bottom of the tool hole.

2. A multiple controller box is shown above. Since this box required a lot of work to manufacture, it was replaced by using either a simple toggle-routing valve on the current foot controller setup, or quick disconnects. This development allows as many hand pieces and rotaries as needed to be operated at the same time. The basic principle of the  controller for the tool is also patented.

3. One way to move the length-of-stroke adjustment to the outside of the hand piece was the ring pictured above. Only one of these was made as a prototype and it was patented when the snap on/off handle was patented. The tool worked nicely, but it was difficult to make and assemble because of all the small internal parts.

4. In the design shown above, stroke adjustment was still in the tool hole, but the addition of the black rings around the body made it possible to adjust the exhaust by turning the ring. When a stroke adjustment was made, the exhaust could also be tuned to make them run even better.
The stroke adjustment on the tools makes one hand piece as versatile as a variety of different-sized hand pieces.

5. Away to adjust the stroke by moving the nose in and out with a ring around the body, while simultaneously adjusting (tuning) the exhaust was an additional patent. Synchronizing the two made the tool run well throughout the stroke range, without having to adjust one and then the other. The ring works in a manner similar to focusing a lens on a camera. Because of the way the nose is held in place, the impacts are isolated to the nose and graver shank. This leads to less vibration to the body during impacting, and provides significantly more power when needed. 

The stroke adjustment is similar to gears in a car and makes the tool perform like numerous handpieces in one. First gear is good for shading and fifth gear is good for background. If thinking about it this way, the past blow-pulse machines similar to my father's machine has one gear.

6. The development of the PalmControl meant the elimination of the foot pedal. I noticed that while engraving with a foot pedal, engravers also vary the pressure used to hold the graver point in a cut. Depending on the depth, engravers vary the amount of palm pressure. This idea was built upon by making a handle that would automatically respond to the palm pressure to operate the throttle. The concept for the PalmControl was: why do we have to duplicate with a foot pedal what our hand is already doing? It was also patented. The legal enforceable claims of the patent protect a hand push pressure activated power tool used in the hand engraving and jewelry fields.

Note: Comments were made by an owner of a competitor that the Lindsay PalmControl is nothing new.  However, the PalmControl technology had not been described or illustrated in a dated public magazine prior. A publication such as this is termed proof of valid prior art. The patent issued only after thorough examination by the United States Patent Office, which courts consider the foremost experts in determining novelty, obviousness, etc. If the engraving world had known of the abilities of this engraving technology, have no doubt that it would have been exploited long ago by a tool manufacturer.

For further reading Michael Arternis has written an
informative article titled insight into the patent system

The PalmControl patent protects a hand push pressure activated power tool used in the hand engraving and jewelry fields as described in one of the legal claims of patent that is provided below. Infringement of the claims of this patent or any of the Lindsay patents by competitor tool manufactures will be taken seriously.

"A hand-held power tool for use in hand working operations in the hand engraving and jewelry fields, comprising: a body having first and second ends; a tool tip holder located at said first end for holding a tool tip; a handle made to be held in the human hand on said body; a variable power means for delivering variable power to said tool tip; a pressure sensing means for sensing the amount of pressure exerted by a human hand between said handle and said tool tip; said variable power means will increase in power when said pressure sensing means senses increased pressure exerted by the user of said hand-held power tool on said handle with the human hand; and said variable power means will decrease in power when said pressure sensing means senses decreased pressure exerted by the user of said hand-held power tool on said handle with the human hand."


The patented Lindsay PalmControl is by far the simplest, easiest to use engraving device ever made. Barry Lee Hands                                                                            Additional Feedback

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