The Sherline Miniature Machinist's Newsletter

Number 68, January 15, 2014

http://www.sherline.com

 


New Product Spotlight

ï Sherline ER-16 Spindle Chucks

Sherline now offers 3- and 4-jaw self-centering and 4-jaw independent chucks with a 22 x 1.5 mm thread that thread onto Sherline's optional ER-16 headstock spindles.

P/N 1042ó3.1" 3-Jaw Self-Centering: $160.00

P/N 1078ó3.1" 4-Jaw Self-Centering: $195.00

P/N 1032ó3.1"4-Jaw Independent: $165.00

Opting for the optional ER-16 collet spindle now no longer eliminates the use Sherline chucks. Now Sherline offers three 3.1" chucks that can be threaded directly onto the ER-16 collet nut thread, greatly expanding the utility of any headstockóSherline or otherwiseóusing this popular collet system.

ER-16 Three- and Four-jaw Self-centering Chucks...

Sherline just introduced 3.1" three-jaw and four-jaw self-centering chucks with a 22 x 1.5 mm threaded hole for use on Sherline's optional ER-16 spindle nose. Three-jaw chucks are normally used to quickly hold round or hexagonal stock. The jaws scroll together as the ring of the chuck is turned. Parts can be held quickly with runout of .003" or less. A self-centering 4-jaw chuck is adjusted like a 3-jaw chuck and can be used on round or square stock, although the stock must be accurate for all four jaws to grip properly. They can be used to quickly hold square material or to provide an extra jaw to spread out the crushing force when holding thin tubing.

ER-16 Four-jaw Independent Chucks...

Four-jaw independent chucks have jaws that adjust one at a time. They are used to hold round, square or rectangular work. Since the jaws adjust independently, it is possible to achieve perfect centering of the part with proper adjustment. Parts can also be held purposely off center. This process is more time consuming than using a 3-jaw scrolling chuck, but it offers the most accuracy. Sherline's 3.1" 4-jaw independent chuck is now available with a 22 x 1.5 mm thread for use on ER-16 spindles.

NOTE: These chucks are not intended for use on high speed spindles exceeding 3000 RPM.

Because you Asked for itóAll Sherline Scrolling Chucks Now Offered in "Loose" Versions

Ease of use vs. accuracyóIn order to achieve maximum accuracy, the Sherline chuck shop grinds each chuck jaw on its scrolling 3- and 4-jaw chucks to within .0001" for a tight fit in the slot. New chucks are smooth but require a bit of effort to turn. This is the most accurate they will ever be, because as they wear and get easier to turn, that means that the jaws can now move a little either way. However, some purchasers of new scrolling chucks are less concerned with accuracy and more concerned with ease of use, particularly if they use the chuck constantly changing parts in setups where maximum accuracy is not required. For those people we now offer the option of ordering the chucks with "loose jaws." We are making and setting aside a few of each size of 3- and 4-jaw self-centering chucks that can be ordered by calling us directly to order or placing an order through our e-commerce site at www.sherlinedirect.com. Just put "loose jaws" in the "Comments/Shipping Instructions" box when checking out. The part number and price remain the same.


Sherline Shop Project of the Month

(Send us your workshop projects and tips for publication here!)

ï NEW KITS!

P/N T1076 Turnerís Cube Kit with 4-jaw chuck: $243.00

or P/N T1000 Turnerís Cube Kit without chuck: $78.00

Challenge your friends to figure out how you made this conversation piece. Stock to make one from aluminum and one from brass is included along with all the special tooling needed.

Everything you need to make a cube puzzle...

With the right tools and the right knowledge, some things that look impossible can be fairly easy to do. Here's a fun project that you can make within an hour or two that will amaze your friends. When done, a tiny cube with holes through it is contained inside another cube with round holes on each side. Both of those are inside a third 3/4" cube with holes in each side. How did they get in there? How was it made? The kit includes an aluminum cube to practice on and a brass cube for your finished puzzle. Producing the finished cube requires a series of drilling and boring processes explained in the 4 pages of step-by-step illustrated instructions that come with the kit.

For those who donít already have one, the P/N T1076 kit includes a 3.1î 4-jaw self-centering chuck. The P/N T1000 kit is the same but without the chuck.

The T1000 kit includes both an aluminum and a brass billet of 3/4" square stock cut to slightly over 3/4" long ready for you to make this interesting puzzle on your Sherline lathe and mill. Included instructions show how it can also be made using just the lathe. Included are a P/N 7600 3/8" tool post, two P/N 3061 boring tools (one is custom ground as an undercut tool), a 1/8" drill, a #2 center drill, a key ring and instructions.

The T1076 kit includes all the above plus a P/N 1076 3.1" 4-Jaw self-centering chuck for those who don't already have one. Using an independent 4-jaw for this project would not really be practical as the cubes must be re-positioned numerous times. Complete instructions are included with both kits that take you step-by-step through the facing, drilling and boring processes needed to free up the cubes within the raw stock.

Other projects done on Sherline machine tools can be found on the Workshop Projects page at www.sherline.com/workshop.htm.


Shop Tip of the Month

Using the Threading Attachment to Wind Springs/Tom Boyer

Retired Craftsmanship Museum master machinist Tom Boyer sent in an e-mail describing how he learned to wind springs using the threading attachment on a Sherline lathe. He discovered this method in Model Engine Builder magazine issue #11 (Mar/Apr 07). He made a custom brass tool based on author Dwight Gilesí design in the article. He feeds music wire through a hole in the tool and the nut is tightened to provide proper tension so wire wraps tightly around the mandrel. The V-notch supports the mandrel as the spring is wound and keeps it from deflecting due to the tension on the wire. Spacing on the rings of wire is determined by the gear combination used on the threading attachment to move the tool post in relation to the rotation of the mandrel.

 

A setup for winding springs. Instead of cutting threads, the threading attachment is used to determine the proper distance between the wraps of wire.

Some springs wound using Tomís method as learned from Dwight Gilesí magazine article.

The tool used to feed the wire onto the shaft and hold tension on it while doing so.

Details of the wire feed tool that is held in the tool post. It is attached to a piece of square stock that is held in the Sherline tool post. In Tomís case he uses the P/N 2250 quick-change tool post.

See the Sherline TIPS page for more useful machine shop tips. If you have a useful tip from your Sherline shop that you would like published, please send photos and a written description to craig@sherline.com.


Did you know?

ï Links to all the instructions for the use of Sherline tools can be found at www.sherline.com/accessor.htm. Itís like a free book on machining.

ï The DRO option for Sherline machines is still currently out of stock. Certain electronic components in the original design became unavailable, so we are in the process of an updated redesign. Watch the Sherline web site for news of its re-introduction.

ï Sherline offers a page with many resources that are handy for machinists. These include kits you can buy, plans you can order, clubs you can joinand more. See http://www.sherline.com/accessor.htm.


Upcoming Model Engineering Shows

2014Ö

ï April 11-13, 2014ó18th Annual Cabin Fever Expo Model Engineering Show & Auctions in the Utz Arena (Formerly Toyota Arena), York Fairgrounds & Expo Center, York, PA 17404

ï April 26-27, 2014óNorth American Model Engineering Society (NAMES) Expo, Wyandotte, MI. 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. See www.namesexposition.com for details.

(Send us your show information and we will post it here.)


Joe Martin Craftsmanship Foundation News

ï Groups Visiting the Craftsmanship Museum in the past monthó

December 21, 2013: The FIRST Robotics group and Team Paradox from Encinitas and Carlsbad hosted a meeting in the museumís conference room. The room is available for a modest fee for your club or group to meet.

New Exhibitsó

ï A 1/12 scale model of the Dorpat 9.5" refractor telescope designed by Joseph von Frandhofer was built and donated by William Gould. He also contributed a very detailed º scale model of a Chevrolet racing engine produced on a 3D printer.

ï Lou Chenotís 1/6 scale Duesenberg is now on permanent display in the museum. His 9-cylinder Bentley BR2 rotary aircraft engine is also now on display.

ï Museum VolunteersóAnyone interested in joining the museum staff as a docent (guide) or machinist in the shop, please contact craig@craftsmanshipmuseum.com or call 760-727-5857 and ask for Craig. Also, if you have built a project worthy of display in the museum, contact Craig to learn about loans or tax deductible donations of your work.

ï Construction UpdateóDue to pipeline installation, traffic to the museum on Lionshead is currently one way westbound on Lionshead starting at Business Park. See our Construction page for a map of how to best avoid congestion in the coming months. The map will be updated as necessary.