Making Wooden Gears

Glue blank from pie-shaped segments of quartersawm stock.

Glue blank from pie-shaped segments of quartersawm stock.

Cut away wood in center of wedges to reduce stress caused by wood movement a good idea, and if I wanted to use just one piece of wood, what would be the best type to use?

Wayne French Baltimore, MD

A I advise against laminating stock to make a gear. Laminated teeth will have a surface composed of long grain and end grain (like the edge of a plywood board), and the teeth will wear unevenly as a result. Instead, I recommend using a single piece of wood if the gear will be small (1 'A in. dia. or less), or better yet, gluing pie-shaped segments together. (See drawing.)

If you're making the gear from a single piece of wood, use a species that doesn't move much with changes in humidity and one that has adequate strength for those teeth that will have short grain running across them. My first choice would be black cherry, wliich is a fairly dimensionally stable wood. However, for strength it's necessary to find slow-grown material with closely spaced growth rings, about 10 to 12 rings per in. minimum. Other woods from which I have successfully cut gears are apple and pecan.

To make the gear from a glucd-up blank, use quartersawn stock and rout away material in the center of each segment to reduce wood movement. (See drawing.) Use at least five pie-shaped segments to make the blank so that the joints are as close to long grain as possible. Also, the teeth will be stronger if the glue lines fall between the teeth rather than on them. The easiest way to ensure this is to count the number of teeth on the gear and make the gear from some number of segments that can be evenly divided into that number of teeth (five segments for a 15-tooth gear, six segments for an 18-tooth gear, etc.).

Ray Levy Wooden machinery maker

Soquel, CA

Trimming Veneer

QWliat is the best way to trim away excess veneer that overhangs a surface?

Bob Schmidt Anchorage, AK

A You can hand-trim veneer by-using a sliarp knife at the point where the veneer overhangs the edge. Make repeated cuts until the overhang is separated, then sand the edge. The knife insures a splinter-free cut but the technique is, unfortunately, pretty slow going.

A faster method is to use a router and a laminate-trimming bit. This is usually trouble-free if you follow a few rules. First, use a new or freshly sharpened cutter, and pick one with the shortest of flutes. Keep the overiiang to less than % in. when laying the veneer, and "climb-cut" (run the router from

Cut away wood in center of wedges to reduce stress caused by wood movement

_______________________when number of segments b divisible into number of teeth.

For more Information and the dealer nearest you, cail:

PERFORMAV VÄ2J121S

12211 Woodlake Dr.. AW08. Burnsvillo. MN 55237

CRCLE NO 100 ON POOOuCT NfOnUOTON FORM

NOW You Can Surface, Dimension and Finish Sand with the PERFORMAX 16-32 Drum Sander

Every project can be done faster end better with Performax's proven and patented features.

This space saving benchtop drum sander will not only surlace stock but also dimension and finish sand. Select from 36-220 grit to surlace rough sawn lumber, to dimension warped stock, to dean-up glued panels, and finish sand the thinnest veneers.

Sand stock as wide as 32" in two passes, as short as 21 /4" and as thick as 3". Scroll saw cut-outs can be sanded in seconds. No press-back application or special jigs are necessary.

A Treat for a Craftsman!

West: 818 797-8262

Injccu Machinery (West)

22PE1 Sol AM . Aluden*.CA 'MOOl

East: 212 807-1155

Gaxrrtc Wade Co.. Inc 161 Avenue of ihc America New York, NY 10013

ORCLE NO 97 ON PROOUCT HFQRMÀTlON F ORV

The INCA 2100SE Tilting Arbor Tablesaw is a contemporary machine with distinct advances in safety and precision."

- Kelly MihJrr, jutlwir «4 "MastrtW/l Y<*ir TuMrsm"IxkJc and vulru

« Fully Tilts, Elevates, Retracts 10"or 12"Blades e Swiss Precision Fcncc & Sliding Dovetail Rails Oversize Arlxjr and Bearings

V Five Year Limited Warranty

V State-of-tbe-Art Guards & Splitter • Completely Dust Collection Ready

Selling 1NCA Machinery with Pride Since 1975 Call for Free Brochure and Sale Pricing:

Was this article helpful?

0 0
The Complete Guide To Wood Finishing

The Complete Guide To Wood Finishing

Wood finishing can be tricky and after spending hours on building your project you want to be sure that you get the best outcome possible. In The Complete Guide To Wood Finishing you will learn how to get beautiful, professional results no matter what your project is, even if you have never tried your hand at wood finishing before. You will learn about every step in the wood finishing process from a professional wood finisher with years of experience.

Get My Free Ebook


Post a comment