Chapter VII: , section 75

Before beginning to plane hold the piece toward the light, close one eye and sight as in Fig. 57. If the surface is not warped or in wind, the back arris ab will appear directly behind the front arris cd. Also sight the arrises for straightness, Fig. 58, being careful to hold so as to get the full benefit of the light. Again, test from arris to arris, Fig. 59. The try-square may be used either side up, but the beam must not be held against either edge. It is not for squareness but for straightness that this test is made.

Notice the direction of the grain and place the piece so as not to plane against it. In Fig. 60 plane from A toward B or the surface will be roughened instead of smoothed. When the stock is rough, the direction of the grain cannot be told readily. A few strokes of the plane will give the desired information. As most stock is to be planed to size, it is well to test with the rule before beginning to plane, so as to know just how much margin has been allowed. If you find you cannot true this first surface without getting the piece within one-sixteenth of an inch of the thickness required, ask your instructor to show you where the trouble lies.

These tests ought to give the worker a pretty fair idea of what and how much he dare plane, so that when he begins he may work intelligently. As few shavings as possible, and those thin ones, with the proper result attained, show forethought and care. Nowhere can good, common sense be used to better advantage than in learning to plane.

When planes are not in use they should be laid on their sides, or otherwise placed so that the cutting edge shall not touch anything.

For roughing off and straightening broad surfaces, the jack-plane should be used, and this followed by the smooth-plane.

When using the plane, stand with the right side to the bench; avoid a stooping position. Fig. 61. The plane should rest flat upon the wood from start to finish. Press heavily upon the knob in starting and upon the handle in finishing the stroke. Unless care is taken to hold the plane level in starting and stopping, the result will be as indicated in Fig. 62 A.

Take as long a shaving as the nature of the work will permit. In planing long boards or where it is desired to lower one particular place only, it becomes necessary to stop the stroke before the end of the board is reached. That no mark shall show at the place where the plane-iron is lifted, it is necessary to feather the shaving. This is done by holding the toe of the plane upon the board and raising the heel as the stroke proceeds, beginning just before the stopping point is reached. If the cut is to commence other than at the end of the piece, lower the heel after having started the forward stroke with the toe upon the board.

It is customary to raise the heel of the plane slightly on the backward stroke that the edge may not be dulled.

When the surface has been planed so that it fulfills the tests by sighting described above, an additional test may be given it. Should the board be of any considerable width--three or more inches--the following test will prove sufficient: Place a straight-edge lengthwise, then crosswise the surface planed and along each of its two diagonals. If no light can be seen between the piece and the straight-edge in any of these four tests, the surface may be considered level or true. Fig. 63.

A second test, one which will answer for narrow as well as broad surfaces, differs from the above only in the manner of determining whether the surface is in wind or not. Two sticks, called winding sticks, are prepared by planing their two opposite edges straight and parallel to each other. These sticks are placed across the surface to be tested, close to the ends, and a sight taken over their top edges. If the surface is in wind the edges cannot be made to sight so that one edge will appear directly back of the other, Fig. 64; one end of the back stick will appear high, at the same time the other one will appear low with reference to the edge of the fore stick. The back corner is high only as compared with the fore corner. The wind may be taken out of the surface just as well by planing the fore corner which is diagonally opposite. Usually, equal amounts should be planed from the surface at each of these corners. If, however, the board is thicker at one corner than the other, it is best to take the whole amount at the thicker corner.

=27. Face Side, Face Edge.=--The first surface and the first edge planed serve a special purpose and are given special names. The first surface is called the face side, and the first edge, the face edge; both may be referred to as the faces. These faces are sometimes known by other names such as working face and joint edge, marked face and marked edge, etc., but their meaning is the same.

That these faces may be known, they are marked with pencil with what are called face marks. There are various ways of making face marks. Unless otherwise instructed, the marks may be made as in Fig. 65; for the face side, a light slanting line about one inch long extending to the edge which is to become the face edge; for the face edge, two light lines across the edge. The marks on both face side and face edge should be placed about the middle of the piece and close together.

These two surfaces are the only ones marked. From one or the other of these, measurements and tests are made. In squaring up stock, for illustration (which means to reduce a piece of rough lumber to definite length, width and thickness so that it shall have smooth, flat sides at right angles to each other) the gage block is held against one or the other of these faces only, and the beam of the try-square when testing for squareness is placed against one or the other of these faces only.

=28. Planing First Edge Square with Face Side.=--Make a preliminary test with the eye before beginning to plane. Sight the arrises of the edge to see where it needs straightening. Examine the end to see which arris is high. Also look to see which way the grain runs. Avoid imperfections in the wood as far as possible in choosing this edge.

It is the part of wisdom to examine the plane-iron to see that the surface planing has not caused the cutting edge to project unevenly. A plane, set out of true, is likely to cause hours of extra work; it defeats every effort that may be made to hold the plane properly.

Strive to get shavings the full length of the piece, especially on the last few strokes.

The smooth-plane is little if ever used for edge planing on account of its short length. In using the jack-plane in which the edge is slightly rounded, thus making a shaving thicker in the middle than at the edges, avoid tilting the plane to make it cut on one side rather than the other. Move the whole plane over to the high side so that the middle of the cutting edge shall be directly over the high place. Keep the sides of the plane parallel with the edge so as to get the full benefit of the length of the plane.

The two tests which this first edge must fulfill are: First, that it shall be straight; second, that it shall be square with the face side. Fig. 6, Chapter I, shows the method of testing for squareness. As in planing the face side, try to accomplish the desired result with as few shavings as possible.

The caution about planing the first surface, where a definite size is to be attained, applies equally to planing the first edge.

When the edge has been properly trued, put on the face marks suitable for the face edge.

=29. Finishing the Second Edge.=--A line gaged from the face edge indicates the proper stopping place in planing the second edge. This line, if lightly made, should be half planed off.

As the line is parallel with the face edge, no straight edge test is necessary. The try-square test for squareness, the beam being held against the face side, must be frequently applied when approaching the gage line.

Where the amount of waste stock to be planed is about an eighth of an inch, the plane-iron may be set a little deeper than average. When near the line, however, it must be set quite shallow. If the waste stock measures more than three sixteenths of an inch, the rip-saw should be used, sawing parallel to the gage line and about one-eighth of an inch away from it.

=30. Finishing the Second Side.=--Lines gaged from the face side on the two edges show the amount to be planed.

The test for this side is made by placing the straight-edge across the piece from arris to arris as the planing proceeds, to see that the middle shall be neither high nor low when the gage lines have been reached. No other test is necessary; a little thought will show the reason.

Never attempt to work without lines. If by mistake you plane out your line, take the piece to your instructor at once, unless you have been otherwise directed, that he may tell you what to do.

=31. Planing the First End Square.=--See that the cutting edge is very sharp and that the plane-iron is set perfectly true and very shallow. Examine one of the ends of the piece by placing the beam of the try-square against the face side then against face edge to locate the high places. Fig. 6.

In free end planing, the cutting edge must not be allowed to reach the farther corner or the corner will be broken off. Plane only part way across the end, stopping the cutting edge half an inch or more from the far edge. Fig. 66. After a few strokes in this direction, reverse the position and plane in the opposite direction, stopping the cutting edge half an inch or more of the first edge.

Keep testing the end as the planing proceeds that you may know what you are doing. Remove no more material than is necessary to square the end, and lay on the rule occasionally that you may not endanger the correct length in your efforts to square this end.

=32. Finishing the Second End.=--Knife lines squared entirely around the piece, at a given distance from the end first squared, limit the amount of the planing that can be done on this end. If the waste stock is over one-eighth of an inch the saw should be used to remove all but a thirty-second of an inch before beginning to plane. Watch the lines. If you are uncertain as to their accuracy, test this end as you did the first one.

=33. End Planing with the Shooting Board.=--Fig. 67 illustrates a way in which the ends of narrow pieces may be easily squared. The plane is pressed to the shooting board with the right hand. The left hand holds the piece against the stop and to the plane.

The face edge of the piece should be held against the stop; the wood must not be allowed to project beyond the stop. If it does, the corners, being unsupported, will be broken away as in free planing when the cutting edge is accidentally shoved entirely across the piece.

The bench hook makes an admirable shooting board. Fig. 68.

=34. Rules for Planing to Dimensions.=

1. True and smooth a broad surface; put on a face mark. This becomes the face side.

2. Joint (straighten and square) one edge from the face side; put on a face mark. This becomes the face edge.

3. Gage to required width from the face edge, and joint to the gage line.

4. Gage to required thickness on both edges from the face side; plane to the gage lines.

5. Square one end from the face side and face edge.

6. Lay off with knife and square the required length from the squared end; saw to the knife line.

=35. Planing a Chamfer.=--Fig. 69 illustrates a good way to lay out a chamfer. A notch in the back end of the gage-stick holds the pencil in position. Holding pencil in this way draw lines on face and edge indicating width of the chamfer. Fig. 70 illustrates the manner of block planing a chamfer, the piece being held on the benchhook. Where the piece can be placed in the vise, Fig. 71 illustrates the method of planing a chamfer with one of the larger planes. First, plane the chamfers which are parallel to the grain; then the ends. If the plane-iron is sharp and set shallow, it can be run entirely across without danger of splitting the corners.

Hold the plane parallel to the edge in planing with the grain. Swing it to an angle of about forty-five degrees in end chamfering, but move it parallel with the edge, and not with the length of the plane.

The eye will detect inaccuracies in planing. If further test is desired, Fig. 72 illustrates one.