Draper BTS251 Manuale di istruzioni - Pagina 12

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There are two basic types of cuts: ripping and cross cutting. In general, cutting with the grain is ripping and cutting across the

grain is cross cutting. However, with man-made materials this distinction is somewhat different to make. Therefore, cutting a

piece of wood to different width is ripping and cutting across the short dimension is cross cutting. Neither ripping or cross

cutting maybe done safely freehand! Ripping requires the use of a rip fence and cross cutting the use of a mitre gauge.

CAUTION:

Before using the saw each time check the following:-

1. Blade is tight.

2. Bevel angle locking knob is tight.

3. If ripping, that the fence locking knobs are tight and the fence is parallel to the table grooves.

4. If cross cutting, mitre gauge locking knob is tight.

5. Guard is in place and functioning properly.

6. Safety goggles, ear defenders and dust mask are being worn.

Failure to adhere to these common safety rules can greatly increase the danger of injury.

Now that you have properly mounted your saw to a suitable bench or stand and have carefully completed the mechanical

alignment of the various components, it is time to become familiar with it's operation. The best way to do this is to recheck your

mechanical alignments operationally. Before proceeding with these operational checks it is recommended that you read and

understand the "Ripping and Cross Cutting" sections on page 12.

You will require several pieces of clean smooth and straight scrap wood 50x100x600mm approximately.

1. Set the saw blade at 0° and blade height to approximately 53mm above the table surface. Be sure the blade angle

adjustment lock knob is locked before operating the saw. Set your mitre gauge to 90° and place in a table slot on one side

of the saw blade. Cross cut approximately 50mm off the end of a workpiece as shown in Fig.18.

Now make the following checks on the workpiece with a combination square:

a. CHECK SQUARENESS OF THE CUT ACROSS THE 50mm

THICKNESS (FIG.15):

1. If cut is not exactly 90° this means that the 90° positive

stop in the table is not properly set.

2. Readjust the 90° end stop.

3. Repeat cross cuts and adjustments until you are

satisfied that the 90° stop and pointer are correct.

b. CHECK SQUARENESS OF THE CUT ACROSS THE 100mm

WIDTH (FIG.16):

1. If cut is not exactly 90° this means that the mitre

gauge 90° setting is wrong.

2. Readjust the mitre gauge 90° setting.

3. Repeat checking cross cuts and adjustments until

satisfied mitre gauge setting is absolutely correct.

2. Now remove the mitre gauge from the table and clamp the rip fence on the table approximately 90mm on the right hand

side of the blade. Leave the blade at 0° tilt and 53mm height as was for the previous checks. Make a rip cut as shown in

(Fig.17) and make the following observations during the cutting.

a. WAS THERE ANY BINDING ON THE BLADE PRIOR TO THE CUT STRADDLING THE RIVING KNIFE?

1. If so, this means that the blade and rip fence are not absolutely parallel.

2. To correct this, first check that the rip fence is parallel to the blade in accordance with Fig.5.

3. Re-adjust rip fence if necessary and repeat rip cuts and adjustment until satisfied it is correct.

4. If the rip fence was not the problem, then the next step is to check the parallelism of the blade to the mitre gauge

slot.

5. Readjust blade if necessary.

6. Make additional rip cuts and adjustments until satisfied there is no longer a blade binding problem. NOTE: If an

adjustment was made to the blade, then repeat cross cut checks above.

b. WAS THERE ANY BINDING ON THE BLADE AND/OR RIVING KNIFE AS THE RIP CUT STRADDLED THE RIVING KNIFE?

1. If so, readjust the riving knife alignment to the blade.

2. Repeat rip cuts and realignment until satisfied no binding remains.

3. With the saw blade at zero tilt, approximately 53mm high and the blade angle adjustment knob locked, clamp and

rip fence on the right hand side of the table and pointer as exactly 75mm on the rip scale. Make a rip cut on the

workpiece.

Measure the width of the workpiece; it should be exactly 75mm.

1. If not 75mm, readjust the pointer.

2. Repeat rip cuts and readjustment of pointer until workpiece width is exactly 75mm.

NOTE: Different types of blades make different kerfs (width of cuts), therefore it is necessary to check the

adjustment of the rip fence pointer when changing blades.

CUTTING OPERATIONS

90º

- 11 -

Fig.15.

50mm

Fig.16.

100mm