Saturday, June 25, 2011
Framed Stained Glass
A friend asked me to make a frame for a stained glass work that her deceased father made many years ago. The leaded glass work lay in her attic for a long time; but she is moving soon and wants to give it a place of honor in her new home. It's a small piece (11"x18"), and I certainly didn't want to have the frame compete with it. The accompanying photo shows the simple, unobtrusive result. The frame will be hung in a window well, from narrow chain. The rear side (not visible in the photo) is also framed out and finished off as carefully as the front. As a result the piece can be viewed from either side. The wood is pine; the finish is multi-stage: a few coats of 2 lb. cut super-blonde shellac, followed by some Minwax cherry stain, then a few more coats of shellac. My hope is that I honored her father's craftsmanship, and that she likes the end product as much as I.
Tuesday, March 29, 2011
Re-sawing Tips You Can't Afford to Ignore
Any motivated woodworker has read the advice usually given about re-sawing. Unfortunately, the advice commonly disseminated is incomplete. This often happens when experts, who forget what it's like not to be experts, offer instruction that is built on assumptions.
This post will give you information you've NOT read elsewhere. If you've done everything "according to Hoyle" and still found yourself upset and frustrated, I think you'll find it particularly helpful.
To prevent confusion and clarify some basic facts, here are a couple of things you need to know in advance: (1) I use a 14" bandsaw with a riser block. (2) I use a 3/4" wide Timber Wolfe re-saw blade (3 T.P.I.). Most of the workpieces I re-saw are several inches high, 24-30 inches long, and about two inches thick. My re-sawn pieces vary in thickness from 1/16" to 3/4". (3) I use a shop-made, flat guide fence, not the kind with the pivot point. The fence is about the same height as the workpieces I re-saw. (4) After ensuring that the table and the fence are both at 90 degrees to the blade, I clamp the fence to the table, following the "drift" line which I've marked on the table in pencil. (5) I make all adjustments to thrust bearings, side guides, etc., both above and below the table, after the upper blade guard/guide post is set at the appropriate height. (The order of operations makes a difference.)
RE-SAWING TECHNIQUE
Faulty technique causes two cutting problems. Trapezoidal cuts result in a finished product is wider at the top than the bottom or vice versa). Trapezoidal cuts are a special problem when re-sawing tall workpieces. Cuts that are uneven along their length result in a finished product is wider where you started cutting than at the rear, or vice versa).
To prevent these problems, observe these cautions:
1. Be aware that as you feed the workpiece, there are two sets of forces being applied to it. One set is a “forward” push (like feeding wood into a table saw blade) that moves the workpiece into the blade. This force determines how quickly you cut. The second set of forces are “lateral”; these keep the workpiece flush to the guide fence. Most problems develop when too much pressure is applied laterally.
2. When feeding any workpiece, but especially a tall one, how you use the push-block that helps keep the workpiece flush to the guide fence (lateral forces) is critical. Exert firm but not very heavy pressure evenly across the “top-to-bottom” face of the workpiece. If you push too hard, or if the force you exert is above or below the center point of the workpiece, a trapezoidal cut will result.
3. For cuts that are straight along their length, the “front-to-back” location of the pressure exerted with the push-block to keep the workpiece flush to the fence makes a huge difference. If lateral pressure is applied on the “fore” side of the blade, the cut will go off and you will wind up with a tapered end product. If lateral pressure is applied on the ”aft” side of the blade, the cut will go off in the opposite direction, but you'll still wind up with a taper. To prevent this, apply pressure only at the point at which the workpiece passes through the blade. In other words, lateral pressure should be applied only where the blade intersects the workpiece.
4. To ensure that the blade is cutting exactly as you want it to, use your eyes, and also gauge the strength with which you are applying pressure(s) on the workpiece. If the blade wanders, even a little, stop immediately. If you do not stop, the situation will only worsen. After stopping the machine, figure out what is going on and why. Then correct the problem. Most often you'll find it's an error in either where force is applied, or how much force is applied, or both.
If there is sufficient interest in this post, I will make a video and post it here.
Wednesday, January 26, 2011
Why Can't I Do That?
Read a woodworking magazine or watch a TV show like the Woodsmith Shop and you're bound to come away feeling both inspired and embarrassed. It's entertaining and inspiring to see the pros complete projects efficiently -- almost magically -- or to read descriptions of their seemingly effortless excellence. But more often than not the reader or viewer is left with two impressions. The first is that the task is straightforward, even easy. The second impression is that the level of excellence the pros display is within everyone's grasp. When we try to replicate what they've done (and, being optimists, most of us do try) we find ourselves frustrated and disappointed. "Why can't I do that?" we ask ourselves. The anwser we don't want to hear is that we are simply less able, slow learners, inept, or clumsy.