(Replaces P/N 1080 as of 4/1/98)
CAUTION!
The cutting tool is shown mounted across the end of the tool. It can also be mounted on either side. Notice the tip of the tool is facing downward as it is designed to cut on the "back" side of the part.
A Compound Slide is used to cut angles or tapers that cannot be cut by "swinging the headstock". (See page 12 of the instruction manual under the section on taper turning.) The slide has 1-1/2" of movement. The cutting tool can be held on either side or across the end of the compound body.
Actual use of the compound is quite straightforward. Use a properly sharpened tool bit which lines up with the center of the part being cut as there is no adjustment other than shimming to raise or lower the tool. The tool is mounted "upside down" with the cutting tip downward and the compound is used on the "back" side of the part.
Four T-nuts are provided to hold the base of the compound to the table for a very secure mount without overtightening. Make sure the base is mounted square to the table so the laser engraved angle scale will provide accurate readings.
FIGURE 1-Cutting a simple taper with the compound slide eliminates the need to rotate the headstock.
The gib grips the dovetailed base of the compound slide tool post and controls both side-to-side play and freedom of movement. If the gib is too tight, the handwheel will be difficult to turn. If the gib is too loose, the tool post will have excess side-to-side play. To adjust the gib (see reference number 7 in the exploded view below), first loosen all three screws holding it down. (The center screw is used to lock the base in place, but it must be loose before the gib can be adjusted.) With one hand, grip the rotating base and the gib and squeeze the gib firmly against the dovetail of the slide tool post. While still holding it, tighten the screws on either end of the gib. Try the handwheel and see that the slide moves freely. If it is too tight, loosen the two screws and adjust again, this time not squeezing quite as hard on the gib. Clean and lubricate the gib and dovetailed slide with light oil periodically.
Designing and manufacturing accessories for miniature machine tools often requires a different approach, and the compound slide is a perfect example of this. On a full-size lathe, the compound would normally be mounted on the crosslide and left in place. On a lathe the size of the Sherline the compound would not only be in the way for many operations, it would add substantially to the initial purchase price of the lathe. Mounting the compound to the front part of the slide limits its movement because of interference with the crosslide handwheel.
FIGURE 2-The compound can also be offset to allow cuts to be taken close to the chuck. It would be more difficult to hold this piece between centers and cut the taper by offsetting the headstock as might normally be done. Take light cuts when the compound overhangs the table like this.
Mounting the compound to the rear of the crosslide not only eliminated this interference, it created two additional advantages. First, since cutting work on the "back" side means the surface of the work is moving "up" past the tool rather than down, the tool is mounted upside down with the cutting tip facing downward. This makes the tool less prone to "chatter", because if the cut gets too heavy, the tool is lifted rather than digging in. Secondly, by mounting the tool only in the upside down position, the slide can be made stronger because it is no longer necessary to leave room for the additional 1/4" spacer required to place the tool at the proper height when using it in the right side up position. This allows the area under the tool to be made thicker.
The compound slide can be used on the lathe with the riser blocks in place by purchasing an optional riser block P/N 1272 which was introduced in August, 2001. This block is about 1" thick and is designed to use the compound slide on the "front" side of the crosslide rather than on the rear as it is used without the riser in place. To use it with the riser block on the front of the crosslide, the cutting tool is reversed so that the cutting tip faces upward in the conventional manner. The one-inch height of the riser allows the compound to clear the crosslide handwheel. Reversing the tool so that if faces upward adds the additional 1/4" needed to make up for the 1.25" height added by the headstock riser block.
-Joe Martin, President and Owner
SHERLINE Products
|
REF. NO. |
PART NO. |
DESCRIPTION |
|
1 |
40530 |
5-40 X 3/8" SHCS |
|
2 |
40280 |
Thrust Collar |
|
3 |
40670 |
10-32 x 1/2" SHCS (3 Req.) |
|
4 |
12760 |
Compound Slide Tool Post |
|
5 |
12740 |
Compound Nut |
|
6 |
12710 |
5-40 x 3/16" SHCS |
|
7 |
12770 |
Compound Gib |
|
8 |
12720 |
Compound Base |
|
9 |
40050 |
Handwheel (Y-Axis) |
|
10 |
40520 |
Cup Point Set Screw, 10-32 x 3/16" |
|
11 |
12780 |
Compound Slide Screw |
|
12 |
12730 |
Compound Rotating Base |
|
13 |
10850 |
10-32 x 1/4" SHCS (4 Req.) |
|
14 |
30560 |
10-32 T-Nut |
|
15 |
12750 |
Clamp Ring |
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