The Sherline Miniature Machinist's Newsletter

Number 61, May 21, 2013


Product Spotlight

ï Geomagic 3D CAD design program now available from Sherline

P/N 8301óGeomagic Design Personal, ìSherline Editionîó$249

Sherline offers a special edition of Geomagic Design Personal that includes the Geomagic Advanced File Import/Export programóa $249 value by itselfófor only $50 more than the standard Personal edition.

(Personal, Professional and Expert versions of Geomagic are also available starting at $199.)

CLICK HERE for a 2-1/2 minute video introduction to the capabilities of Geomagic Design

Why Learn 3D CAD?

1. For the fun and challenge of creating photo-realistic 3D parts and mechanisms right in your computeróno shop tools necessary, no chips to clean up or bad parts to scrap out

2. For a business or job shop that needs to open client drawings in 3D CAD formats for biddingósave the cost of an expensive professional CAD program by getting the Sherline "Special Edition" that includes the Advanced import/export program.

3. To share your designs, mechanical creations and re-creations with others with the same programóa library of drawings will be featured on a page at the Joe Martin Foundation Craftsmanship Museum's web site at There are also other sites that allow you to share your 3D CAD creations for free like or for profit at .

(L) Opposed steam engine (R) ìMillieî Oscillating steam engine

Geared steam engine. These engines were drawn using Geomagic 3D CAD software by Joe Martin from free dimensioned plans available at Itís like building real steam engines but without the chips and scrapped parts.

Contact Sherline or CLICK HERE to learn more about Geomagic Design 3D CAD software.

ï Microscopes Discontinued but mounts still in stock

For the second time, the microscope model we had been purchasing has been discontinued by the distributor. Rather than redesign the mount and rewrite the instructions again we have decided to stop offering P/N 2125 and 2127. However, we still have some remaining mounts in stock. If you have purchased a Sherline microscope and lathe mount, for example, you might want to pick up a mill mount while they last.

P/N 2126 Lathe microscope mount only ($126.00)

Base mounts to lathe table. Scope is focused on tool tip and moves with tool to stay focused on cut as table moves.

P/N 2128 Mill microscope mount only ($225.00)

Mounts to headstock. Allows microscope to be swung in 90∞ arc to view cutting operation from front, left side or anywhere in between. Point of focus stays on cutting tool at any position.

Sherline Shop Project of the Month

Honda 50 to 125 Supercharger Project/Robert Rosenfield

NOTE: This project was originally featured in Newsletter #6 over 4-1/2 years ago. The mailing list has grown so much larger since then that there are many who didnít get to see this impressive project, so we are bringing it back one more time.

    The supercharger turbine in production and finished. The body and other parts are also shown.

According to Robert Rosenfield, this is his Model SC125 supercharger designed for 50 cc thru 125 cc four-stroke motors used in pit bikes, super pocket bikes, go-karts, Honda 50's, etc. Overall dimensions are 4-1/2" O.D. x 5-1/2" tall x 4-3/4" wide. Turbine: 63 mm (2-1/2") 30∫ blade with left-hand thread. Design features include 2-1 pressure ratio variable boost, maximum 100,000 RPM shaft speed and 24-34 mm carburetor sizing. Pressurized oil feeds to plain bronze bearings with VitonT seals for high temperatures.

The photos show that Robert has also been able to obtain really nice finishes with his manual and CNC Sherline machines. The main body is made from one large billet of aluminum. It can take several days of machining time to get it down to size. Although this could be done quicker on a larger, more powerful machine, it is interesting to note that the hobbyist with time and talent but limited funds and space can still achieve superb results with tabletop machine tools.

More on this and other projects done on Sherline CNC machine tools can be found on the CNC Projects page at

Shop Tip of the Month

Making your own set of CNC Box wrenches/Joe Peitz

Joe Peitz of Nashua, NH submitted a program and some photos showing how you can make your own set of box wrenches using a Sherline CNC mill. A couple of sub-routines are utilized. This project is a good example of the versatility of CNC. Hereís what he had to say:

ìI ran into a Sherline 2000 at my local hobbyist club. I looked around and looked around for sample programs used for making box wrenches and couldn't find one, so I wrote one and would like to pass it on for inclusion in your next software release if you think it passes muster. The program mills a box wrench out of sheet of material using only g-codes. By editing the program you can change the number of flats, width, length, diameter and depth of total cut which are variables inside the program which is fairly heavily commented. It can result in a quite useable tool and (I think) it shows off the power of G-code and the Sherline 2000. If you want to use it, feel free to edit it in any way and/or distribute it free from any copyrights.î

óJoe Peitz


Shown above are several test parts cut from wood to test the g-code plus a piece of aluminum from which one of the wrenches was cut.

CLICK HERE to view a PDF file that further explains the process.

CLICK HERE to download a text file in .NGC format that contains the g-code. The code has a lot of comments added in parenthesis to explain the process in further detail. If you g-code experts out there have any suggestions for improvement we will pass them on to the author.

See this and other CNC projects at There are also 70 handy shop tips at

Projects others have built with Sherline tools can also be found at

Did you know?

ï Sherline participated in the 2013 NAMES (North American Model Engineering Society) Expo in the Detroit area last month. CLICK HERE to see some photos from the show.

ï Large user groups for Sherline tools can be found at . Type ìSherlineî in the query box where it says ìFind a Group.î The manual ìSherlineî group has over 6000 members, while the ìSherline CNC group now has over 2600 members. There are other specialized groups as well. These user groups are a great way to get your specific questions answered by the people who actually use the tools. You can also get a look at photos of some of the projects people are building if you join the group.

ï A great place to find free plans for engines and projects to build is

ï For the past few weeks Sherline has been transitioning from one web host and phone service to another. We apologize for any access problems you may have experienced with our phones, e-mail or web site. If you are reading this newsletter, that should mean we are now up and fully functional with our new host.

Upcoming Model Engineering Shows


ï North American Model Engineering Society (NAMES) Expo, Wyandotte, MI, April 26-27, 2014. Sherline will have a booth there and the Joe Martin Foundation will present its annual award to Metalworking Craftsman of the Year during the show.

Send us your show details and we will post them hereÖ

Joe Martin Craftsmanship Foundation News

ï New Museum DisplaysóIn the machine shop we have on display a machine that does nothing. That is to say, it produces no product, but it is certainly not without function. Its job is to create smiles. Consisting of over 740 gears, it was built in the late 1940ís by Lawrence Wahlstrom and donated by the family of its last caretaker, Earl Wolf. Called the ìDo Nothingî machine it was featured on a number of TV shows and national magazines back in the 1950ís.

A collection of 10 fine dollhouses and some additional scale furniture by the late Al Cushman has been donated by Jan Haring in memory of her husband Joe who helped build the structures while she did the decorating. These clever themed creations include not only a big 3-story house, but Santaís Workshop, a dress boutique, a 1950ís basement rec room, a witchís house, a dome covered window scene and a gypsy camp in 1î=1í scale plus a French Colonial home, Mimiís CafÈ restaurant and 4 floors of rooms built inside a mantel clock in ºî=1í scale.

A cutaway model of the Sandy Creek wooden bridge in Oregon was donated by retired architect Charles Beck of Medford, OR.

A Gerstner tool box with his lifelong collection of measuring tools was donated by 91-year old retired machinist Mel White. (We will be starting a display of machinistís tool boxes in the museum machine shop.)

ï DonationsóOur thanks to Young H. Wong for a generous cash donation in the name of her brother, the late Dr. Young C. Park. Mr. Parkís aluminum model airplanes were among the first major contributions to the museum and what first put us on the map. He was selected as Metalworking Craftsman of the year in 2002 for his fine work.

ï Groups Visiting the Museum

óThis past month has seen two special groups tour the Craftsmanship Museum. Joining us this month were:

††††††††††† May 4th: The Simi Valley Corvette Club

††††††††††† March 11th: The San Diego Asebring Assn. (Autocross racers)

See the Club Visits page for a photo of the group.

ï Publicity

A large front page article with photos in the North County section of the San Diego Union Tribune in April brought a lot of visitors to the museum. For example, on one Friday/Saturday period after the article came out we had over 140 visitors. The lead photo of the article featured the Miniature Arms Society loan of 90 miniature guns and knives that is still on display, but many came to see the other exhibits too.

Anyone interested in volunteering your services at the museum, please contact or call 760-727-5857 and ask for Craig.