The Sherline Miniature Machinist's Newsletter
Sherline Workshop Project of the Month
Miniature CO2 Race Cars/Scotty Hewitt
Scotty Hewitt built these tiny CO2 powered race cars from aluminum and carved the bodies from balsa wood. A jaunty driver sets a playful mood sitting in the cockpit of each.
Hewitt was Sherline company owner Joe Martinís race
car instructor when he got his SCCA racing license to race vintage sports cars
and Formula Fords. Scotty wanted to learn how to do miniature machining, and
Joe wanted more instruction, so they worked a trade. Joe traded a Sherline
lathe for extra driving instruction. It turned out to be a good deal for both.
Scotty went on to win several Sherline Machinistís Challenge contests with his
steam engines and race cars, and Joe went on to win a Formula Ford championship
in the mid-1990ís in the San Diego Region of the SCCA.† Scotty has also built a number of extremely
tiny steam engines which are now on display along with the red racer shown
above at the Joe Martin Foundationís Craftsmanship Museum
These racers use a small CO2 bottle like the ones used to power paintball guns to charge an even smaller cylinder with the carís frame. This supplies power to the piston engine that drives the rear wheels. CO2 engines were once used in small flying model airplanes before reliable light weight gas engines and, more recently, electric powerplants were available.
†The detailed ìengineî in front is just for looks. The real engine is hidden underneath.
Shop Tip of the month
A Simple Adjustable Depth Rod/John D. Cannon
A depth stop allows a part to be inserted through the chuck only to a certain depth inside the spindle so that each successive part is held at the same point. The depth is easily adjusted by moving the rod. In the photo above (left) you can just see then end of the brass rod inside the chuck. The right-hand photo shows how the depth rod is attached to the lathe spindle. Loosening the outer set screw allows you to adjust the rod for depth.
John Cannon of
This and more than 50 other helpful tips for Sherline machinists can be found at www.sherline.com/pages/tips.htm.
P/N 8760 4-axis CNC Driver box, $600.00
The 8760 CNC 4-axis driver box comes with cables, power supply and new Ubuntu Linux/EMC2 software. A driver box provides the signals and power to turn G-code instructions into stepper motor rotation on your CNC lathe or mill.
Driver BoxóThe Sherline 8760 driver box is a stand-alone version of the unit that comes inside the Sherline CNC computer. Purchasing the box separately allows you to use your own computer to control your Sherline CNC lathe or mill and thus save a little money. The only requirements are a computer that has at least an 800 MHz clock speed (Pentium III or higher), a 25-pin parallel (printer) port and a DVD drive. The power supply works with any worldwide voltage, and the Ubuntu Linux/EMC2 operating system and G-code control software is included in the package. If you choose prefer to use a WindowsÆ based control program, Mach3 can be purchased elsewhere and works fine with the driver box. The 4-axis box will plug into Sherline stepper motor cables to run the X, Y, and Z axes plus the A-axis for a rotary table. The Linux OS and EMC2 G-code control software is included on a DVD. A second CD includes instructions and a folder of useful utilities to turn CAD drawings and fonts into G-code.
Optional driver box and motor packagesó The driver box can be purchased with the number of stepper motors needed for your application, thereby saving you some money. The combinations are as follows:
ï P/N 8765óDriver box and 2 stepper motors for CNC lathe ($730.00)
ï P/N 8770óDriver box and 3 stepper motors for CNC mill ($805.00)
ï P/N 8775óDriver box and 5 stepper motors for CNC mill/lathe shop package ($935.00)
Did you know?
ï DC MOTOR
RECALL NOTICEóSome Hill
ï An announcement has been made that after 18 years of hosting the Sherline Machinistís Challenge contest at the NAMES show that the contest will not be held in 2010. This will provide Sherline representatives at the show more time to answer questions about the tool line and accessories. Sherline will allow projects built on Sherline machine tools to be exhibited at Sherlineís booth should anyone wish to do so.
The Cabin Fever Expo in
The North American Model Engineering Society (NAMES) will host its next major
Joe Martin Craftsmanship Foundation News
The newest addition to the on-line
The donation of a highly detailed brass Bucyrus-Erie Shovel by Les Cade highlights some new
additions to the
The museum in
ï The Joe Martin Foundation is a 501(c)(3) organization and can offer a tax deduction for the full value of high quality miniature metalworking projects, tools or books donated for display. Contact Director Craig Libuse for details at (760) 727-9492 or firstname.lastname@example.org. Donít let your fine work end up in a swap meet or on eBay if something should happen to you. Make plans for peace of mind.