The angle plate attachment for the Sherline mill was designed with help and many suggestions from Graham Taylor of Livonia, Michigan. The multiple hole pattern allows the rotary table or mill vise to be attached directly to the table. Also included is a 3/4-16 adaptor which attaches to the table, allowing you to directly mount Sherline 3-jaw or 4-jaw chucks to the angle plate as well.
The angle plate must be mounted square to the table. The mounting hole layout should be reasonably accurate, but for very close work, use an indicator to square the plate. The movement of a plate tilting at angles can be very confusing. It would be wise to consider how error can accumulate by not having the table square. If square, as the table is tilted a given point moves in relation to only one axis but not the other. If not square, it moves in relation to both axes, making accurate machining almost impossible. For example, you might start a cut several thousandths deep at one side of a part and end up cutting nothing at the other side. To make this clear it is easier to picture what is happening if you visualize an extreme case where the table might be mounted 15° off from square. Picture the path your cutter would make if you made a pass over a part mounted that far off square and you'll see what I mean.
Always make a sketch of your setup and make sure you have the correct table angle. When using an end mill, remember that the angle of the cut depends on whether you are using the end or the side of the milling cutter. The bottom of the cutter cuts the angle indicated on the angle plate scale, while the side of the mill cutter cuts an angle equal to 90° minus the angle set on the table. (See Figure 1.)
FIGURE 1—The angle of your cut is dependant on whether you are cutting with the side or end of your milling cutter.
The hole pattern in the bottom of the angle plate has been designed to pick up the T-Slots in the mill table or in the crosslide table of the lathe when using the vertical milling column attachment. Use the T-nuts and socket head cap screws in four of the six mounting holes on the Bottom Plate. Use the two center holes and two of the end holes for mounting to the lathe table. For the mill table, use all four end holes.
The hole pattern in the table of the angle plate has been designed to allow you to mount several Sherline holding devices. These include the rotary table, mill vise, 3-jaw chucks and 4-jaw chucks. This is why the hole pattern looks a bit odd. You can also drill additional 10-32 holes to meet your own unique mounting requirements. The following diagrams show which holes to use for mounting each of the accessories. As an additional feature, the rotary table location has been calculated so that when rotated to the 90° position, it comes out at the same height as the rotary table tailstock, which eliminates the need for the right angle attachment.
FIGURE 2—Mounting points for the rotary table. Solid black circles indicate holes used for hold down screws on this and the following diagrams.
FIGURE 3a and 3b—Mounting points for milling vise. It can be mounted in either direction on the table.
FIGURE 4—Mounting points for the the 2.5" 4-jaw vise.
FIGURE 5—Mounting points for the the 3.1" 4-jaw vise.
FIGURE 6—Using a Tommy Bar to keep a 3-jaw chuck from unscrewing during machining. Place the Tommy Bar in one of the holes in the upper chuck body and use a 10-32 socket head cap screw as a stop. To lock the chuck down in the proper position, put the socket head cap screw that goes into the 3/4-16 hold down in from the bottom of the plate. Rotate the chuck to the desired position with the Tommy Bar against the stop screw and then tighten the hold down screw to lock the chuck in place. Then set the plate to the desired angle.
FIGURE 7—ALTERNATIVE SETUP
Note that by removing the four screws that hold the side plates to the base, reversing their direction and reinstalling them, the tilting plate can be reversed to allow the table to face the opposite direction in relation to the base. This may offer an advantage in some setups.
The angle graduations are laser engraved into the stainless steel side plates so you don't have to worry about rust or solvents. Do not try to polish around the engraving. Though quite easily readable, it is not very deep and could be removed in the polishing process.
Joe Martin
President and Owner
|
REF. NO. |
NO. REQ. |
PART NO. |
DESCRIPTION |
|
1 |
1 |
3754 |
Tilting Angle Table Bottom Plate |
|
2 |
1 |
3751 |
T.A.T. Top Plate |
|
3 |
1 |
3752 |
T.A.T. Side Plate, Plain |
|
4 |
1 |
3753 |
T.A.T. Side Plate, Engraved |
|
5 |
2 |
3755 |
T.A.T. BushingTD |
|
6 |
1 |
3756 |
T.A.T. 3/4-16 Chuck Hold Down |
|
7 |
4 |
3056 |
10-32 T-Nuts (Short) (Not shown) |
|
8 |
13 |
4067 |
10-32 x 1/2" Skt Hd Cap Screws |
|
9 |
2 |
4066 |
3/16" I.D. Washer |
|
10 |
1 |
5012 |
Pointer |
|
11 |
1 |
3210 |
10-332 Hex Nut |
|
12 |
1 |
5021 |
8-32 x 1/4" Phillips Head Screw |
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