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10

Controlling the cut:
Hydraulic feed control

The weight of the saw arm typically provides all of

the force needed to move the saw blade through the
workpiece.  In fact, if the full weight of the arm is allowed
to make the cut, rapid blade wear and poor cutting
accuracy will result.  Therefore, a hydraulic feed control is
provided which gives the operator control over the speed
and efficiency of cutting.

The hydraulic feed control is a single-acting

hydraulic cylinder attached between the saw base and
saw arm.  The hydraulic control cylinder has two flow
controls.  The control needle valve -- used by the operator
to control the rate of cutting -- is on top of the cylinder.  A
quick shut-off valve is located in a hydraulic line on the
outside of the cylinder.

The control cylinder is 

single-acting

 because it can

be used to resist motion in the downward direction, only.
The control cylinder offers no resistance to upward
movement.

The amount of downward force can be controlled by

using the needle valve on top of the cylinder.  When the
needle valve is closed the cylinder is "locked."  With the
needle valve open slightly, the cylinder permits slow, or
light downward force.  As the needle valve is opened
further, increasing weight of the saw arm presses on the
blade and workpiece.

The needle valve is opened, during any cut, until the

operator determines that the saw is operating efficiently.
This is usually evaluated by observing chip formation.
See the section on 

Blade Selection, 

for more information

on evaluating cutting efficiency.

The quarter-turn quick shut off valve in the external

line of the control cylinder can be turned to lock the
cylinder at any time.  For instance, it can be used to lock
the blade above the work piece to allow you to measure
the length of cut on the workpiece.  Or, it can be used for
making repeated cuts after the needle valve has been set
for best cutting efficiency.  (This is described in the next
section.)

To close the hydraulic control circuit and lock the

cylinder, turn the quick shut off valve handle so it is at
right angles to the hydraulic line or hydraulic cylinder.

To open the hydraulic control circuit and return feed

control to the needle valve, turn the quick shut off handle
so it is parallel with the hydraulic line or hydraulic cylinder.

Using the stock stop
for repeated cuts

If you are cutting multiple pieces of stock, all to the

same specified length, use the stock stop.
1.  Lower the saw arm to its horizontal position.
2.  Loosen the stock stop set screws as necessary to slide
the stop upward and more-or-less into position.
 (There are two set screws which are use to lock the stop
stock in position.  One is on the saw table and is typically
used to adjust the distance between the stop and the
blade.  The other set screw is on the stop, itself, and is
typically used to adjust the height of the stop above the
table.  However, you can use any combination of set
screws you find convenient to adjust the stop to the
distance and height which works for the stock you are
cutting.)
3.  Using a ruler or scale, measure the distance between
the blade and stock stop.
4.  When the correct cut-off distance is obtained,  be sure
the stock stop is at a  position which allows the cutoff
piece to fall away from the blade as the cut is completed.
Then, tighten the stock stop set screws securely.
5.  Raise the saw arm.
6.  Place a workpiece in the saw vise and slide the
workpiece so it contacts the stock stop.
7.  Open the hydraulic control cylinder quick shut off valve
and move the saw blade to just above the workpiece -
then close the needle valve so the arm is locked in
position.
8.  Measure the distance between the end of the
workpiece and the blade to verify that you have set the
stock stop at the correct distance.  (See 

Figure 6

.)

9. When you are satisfied that your cut-off distance is
correct, you may begin cutting by turning on the saw and
opening the needle valve until the blade is cutting
efficiently.

To continue making multiple cuts take the following steps:

1.  

Do not change the setting on the needle valve.

2.  Raise the saw arm so it clears the stock being cut and
lock the hydraulic control cylinder using the quick shut off
valve.
3.  Release the vise slightly using the handle wheel --
move the stock up to the stock stop -- tighten the vise
again.
4.  Turn on the saw and open the quick shut off valve.
Because you established an efficient cutting rate on the
previous cuts using the needle valve, there is no reason to
change its setting.  The quick shut off, alone, can be used
to begin  and complete the cut.

Figure 6: Using the stock stop

Содержание J-3410

Страница 1: ...tructions and Parts Manual 7x12 Horizontal Band Saw Models J 3410 J 3410 2 JET 427 New Sanford Road LaVergne Tennessee 37086 Part No M 414454 Ph 800 274 6848 Revision B3 01 2014 www jettools com Copyr...

Страница 2: ...More Information JET Wilton and Powermatic are consistently adding new products For complete up to date product information check with your local distributor or visit the JET Wilton or Powermatic webs...

Страница 3: ...Adjust Blade for Parallelism 16 Adjusting Blade Vertical 17 Test Cutting to VerifyAdjustmentAccuracy 17 Adjusting Guide Bearings 18 Replacing Guide Bearings 18 Adjusting Blade Back Up Bearing 18 Repl...

Страница 4: ...ystem which can greatly extend blade life and speed the cutting of a variety of materials which are best cut with cutting fluids and coolants 1 gallon 4 4L capacity tank with 3GPM 13L M pump Optional...

Страница 5: ...se the right tool Don t force a tool or attach ment to do a job it was not designed for 16 Use only recommended accessories and follow manufacturers instructions pertaining to them 17 Keep hands in si...

Страница 6: ...ustment of blade support mechanism is done or before any attempt is made to change the drive belts or before any periodic service or maintenance is per formed on the saw 7 Remove all loose items and a...

Страница 7: ...can pivot and also tilt upward Therefore this nut should be slightly loose This will allow the jaw to pivot an conform to any angle at which the stationary jaw is set However you should guard against...

Страница 8: ...or all angle cutting Changing the stationary vise jaw position 1 Remove the pivot and lock bolts 2 Slide the stationary jaw to the required position on the table 3 Re insert the pivot and lock bolts 4...

Страница 9: ...Figure 1 4 Lay a straight edge on the saw frame so it contacts the stationary vise jaw See Figure 3 5 Turn the vise jaw until the straight edge is above the angle of cut you require as shown on the a...

Страница 10: ...valve turn the quick shut off handle so it is parallel with the hydraulic line or hydraulic cylinder Using the stock stop for repeated cuts If you are cutting multiple pieces of stock all to the same...

Страница 11: ...shape supplied Blade break in procedures New blades are very sharp and therefore have a tooth geometry which is easily damaged if a careful break in procedure is not followed You may want to consult m...

Страница 12: ...Material Speed Angle cutting 1 Raise the saw arm to full height and lock it in position with the quick shut off valve 2 Slide the vise open 3 Set the stationary vise jaw to the angle required accordin...

Страница 13: ...13 Figure 8 Placing workpieces in the vise...

Страница 14: ...blade is fully tensioned release tension slightly before attempting to adjust the saw blade tracking A badly worn or bent blade will be extremely difficult to track properly if it can be tracked succe...

Страница 15: ...sing the stationary vise face or the saw table When to adjust the blade guides The blade guides when installed at the factory have been adjusted for maximum sawing effectiveness and if not disturbed d...

Страница 16: ...lishing a reference angle to be sure the jaw is correctly set 3 Lower the saw arm to full horizontal position 4 Use a machinist s protractor against the stationary vise jaw and check the blade for par...

Страница 17: ...to perform these test cuts as follows 1 With the bar stock securely clamped in the vise make a cut through the bar stock See Figure 14 2 Mark the top of the bar stock 3 Move the bar stock about 1 4 in...

Страница 18: ...loosen the lock nut for the eccentric bolt 3 Turn the eccentric using the adjustment tang to loosen or tighten the bearing set as needed 4 Tighten the jam nut 5 Check bearing tightness on both sides o...

Страница 19: ...nce of leakage and turn them to feel for roughness or other internal flaws Replace if leaking or roughness is felt Examine the wheel for damage on its drive edge shoul der or the bearing mounting boss...

Страница 20: ...emove piston from the rod 16 Remove the U ring from the piston 17 Remove the one external and the two internal O rings from the top cap Discard all soft parts 18 Clean all metal parts with a suitable...

Страница 21: ...cal The saw is delivered as either a 115 volt or 230 volt saw depending upon your order Wiring diagrams for either type of circuit are shown here The motor is connected internally to achieve the volta...

Страница 22: ...ubber disc mounted on a flat headed screw The screw height and therefore the horizontal position of the saw arm is adjusted using two nuts on the screw The motor switch is supposed to turn the motor o...

Страница 23: ...e while observing chip formation to be sure you are cutting efficiently 1 Reduce speed of blade 2 Increase feed pressure in scale or hard spots 1 Work hardening materials such as stainless require a h...

Страница 24: ...chip formation to verify efficient cutting 1 Increase blade speed Check technical literature or blade or workpiece supplier for blade speed recommenda tions 1 Be sure vise is tight 2 Support slender c...

Страница 25: ...tion The item numbers shown on the illustration relate to the item number in the facing parts listing Order replacement parts from JET 427 New Sanford Road LaVergne Tennessee 37086 Ph 800 274 6848 www...

Страница 26: ...26 Exploded View Saw Head...

Страница 27: ...ot shown 1 1 J 5710011 Pulley cover 1 2 5710021 Motor pulley 1 4 1 5710041 HH screw 5 16X1 8 5 J 5710051Motor 3 4 HP 115V 1PH 1 6 J 5710061Motor mount plate assy 1 7 5710071 HH screw 5 16x5 8 3 8 5710...

Страница 28: ...28 Exploded View Saw Base...

Страница 29: ...ee support 1 111 5517529 HH screw 3 8x1 3 4 2 115 5711271 Support shaft 5 8 1 5711771 Support shaft 7 8 119 5711321 Stock stop 1 120 5711331 Thumb screw 1 121 5711341 Stock stop rod 1 123 5517530 HH s...

Страница 30: ...der Ref no Part no Description Qty 1 5517547 Dust cover 1 2 5517548 Retaining ring 2 3 5517549 Oil seal 1 4 5517550 Oil piston 1 5 5517551 O ring 1 6 5517552 Cylinder body 1 7 5517553 Oil pressure reg...

Страница 31: ...31...

Страница 32: ...32 427 New Sanford Road LaVergne Tennessee 37086 Ph 800 274 6848 www jetttools com...

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