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Many of you know Joel as the organizer and facilitator of the woodworking, gardening, and cooking demonstrations and seminars at the Woodsmith Store in Des Moines, Iowa.  He is also an editor for Woodsmith and ShopNotes magazines and facilitates the blog you’re reading now. It is with great sadness that we pass on the news that Joel lost his wife Lisa on Wednesday, June 24, 2009.  She died from complications of ALS (Lou Gehrig’s Disease).

Lisa Hess was an amazing individual filled with kindness and gentleness. She was a gifted gardener and her landscapes were always filled with immense beauty. She will indeed be greatly missed.

Lisa, while you’re tending to gardens much more beautiful than we could imagine, we promise to try and keep Joel out of mischief.

If you’re into ShopNotes Magazine and enjoyed building with an Erector Set as a kid then chances are you’ll enjoy the 80/20 website.

The 80/20 company has a product line that they call “The Industrial Erector Set.” Basically it’s a framing system that uses T-slotted extruded aluminum tubes and bolt on connectors.  But, that is an oversimplification because there are thousands of different parts and variations available which makes the system highly adaptable for applications such as machine frames, automation, furniture, lineal motion, displays, and (to borrow from their catalog) “modular anything.”

So, visit the 80/20 website and think of all the cool stuff you could build for your shop!

Furniture designer and builder Sam Maloof passed away recently at the age of 93. I had the pleasure to meet him in the mid-1990s. I was an assistant editor at Woodsmith Magazine in Des Moines, Iowa. Maloof, along with several other woodworking luminaries, was in Des Moines to make a guest appearance at a woodworking show. Woodsmith publisher and editor Don Peschke invited them to a party in the garden at Woodsmith headquarters. It was a beautiful evening.

Sitting at one of the tables under a big awning, a couple of assistant editors and myself found a rare moment when Maloof was alone. We had recently watched a documentary in which Maloof was carving a piece of walnut on a band saw with the blade guard removed and about 8″ to 10″ of blade exposed. So we asked him if he had ever been injured in the shop. He said yes, but only once. He said he’d been napping in the shop, and for some unknown reason awoke quickly and started back at the band saw where he had left off. That was when he buried the blade in his thumb. He showed us the scar.

But what I saw were the hands. His hands were big and strong and impressive. They were the hands of someone who worked with his hands every day. He was a designer/artisan. He was what we wanted to be on some level, if only we’d had the creativity and the skill to pull it off.
He was also very nice. We asked a few other dumb questions which he answered with candor and humor. Quite a guy.

I looked through several photos of Maloof for this post and chose the one above. You can see his hands.

You can read about his life and work in this LA Times obituary with lots of photos.

Recently I’ve been working on a prototype for a sharpening center for ShopNotes 107. Building a machine is one of my favorite shop projects. It’s always a thrill to watch turning shafts, sheaves, and moving belts in action on a tool I made myself. Experience (making poorly functioning machines) has taught me that much of the success in shopbuilt machines lies in the bearings and their installation. You won’t be proud of a machine that vibrates, or is feeble, or is inaccurate due to misaligned bearings.

There are, of course, many requirements for bearings and so there are many types. One type that I find quite handy for low rpm applications is a bronze sleeve bearing. They are easy to work with, durable, and inexpensive.

In a sleeve bearing, the load is supported through the sliding motion of one solid surface against another, very simple. The sleeve bearings you’ll find at your local hardware store are made of oil impregnated sintered bronze. Sintered bronze bearings start as a powdered bronze alloy that is molded into the correct shape and heated to fuse the bronze grains together thus creating a porous structure. Oil is then forced into the voids. As much as 18% of the bearings volume is oil and this creates a permanently lubricated bearing.

Sleeve bearings typically come in two different styles. Those that look like a short piece of tube are designed to carry radial loads, like a spinning shaft. The other style includes a flange on that piece of tube. This bearing is designed to carry both radial and thrust loads. For example, a spinning shaft that’s being pushed on from one end. The style that you choose depends upon the application.

Even though they are simple, there are a few things to keep in mind when using these bearing.

One simple way to install a sleeve bearing is to press fit it into a wooden part. However, if you plan on press fitting  a bearing  get the largest shell diameter available. Thin shell bearings will actually compress somewhat into a smaller internal diameter if forced into a very tight hole. The result will be a shaft that will not turn freely, if at all. (This will make you very angry.) And, always make sure to seal any wood that touches the bearing with some shellac or varnish. Remember that porous structure impregnated with oil? The oil will wick out into raw wood leaving a dry bearing on the road to failure.

Another way of mounting a bearing is to use an oversize hole with epoxy paste allowing the bearing to seat into the correct alignment with the shaft in place. I think it’s a good idea to rough up the exterior of the bearing with coarse sandpaper to allow the epoxy to get a “grip” on the bearing.

Whether you’re using epoxy to mount the bearing or even applying finish around it, protect the interior of the bearing with some wax and plug the opening. It’s hard to ream glue or paint out of the bearing  without causing damage. (This will also make you angry.)

I’ve found it’s often better to build your machine around the bearings with the shaft in place. This ensures proper alignment rather than to just hope that things will turn out right down the road. Remember, there’s more to an accurate machine than precisely cut parts. Accuracy must be part of the whole process of building a tool.

The last thing to consider is the shaft. Here it pays to spend a little more and  get a precision ground shaft. You can’t expect smooth performance from a piece of not  quite round hot rolled stock from the hardware store.

Simple, durable, and inexpensive, a sleeve bearing is a great option for a shopmade machine tool.