Roll Cutter Assembly

Congratulations on your purchase of the Krexil CNC roll cutter. This device will save you time, material and effort while helping deliver a professional result.

For part names used in these instructions, see Roll Cutter Item Names.

Customer Service

The roll cutter includes several mechanical and software adjustments to accommodate a wide variety of materials, including paper and film. If not properly adjusted, you may experience issues, but if the Troubleshooting section does not solve your issue, our customer support team is happy to help. Contact staff@krexil.com or call 551-600-1400 M-F 9am-5pm EST. Please provide your menu settings, material type, thickness, width, cut length and roll diameter. Krexil welcomes your feedback and requests for customized versions.

Important Safety Guidelines

Read all instructions before using.
Do not use the device for anything other than the intended use.
Place the device on a flat, firm, stable surface.
Disconnect power before making any adjustments or changes.
Keep the device out of reach of children.
This device is not intended for use by persons with reduced physical, sensory or mental capabilities or lack of experience, unless supervised by a person responsible for their safety.
See Replacing Blade when installing or changing the cutting blade.
Do not operate while under the influence of drugs, alcohol, or medication that may affect your ability to use the tool.
Keep hands, hair, etc. away from moving parts. Models with 48" width or more have stronger feed motors.
Print and save these safety instructions.

Avoid Damage

Stop tightening screws in plastic when you feel increasing resistance.
Do not bend the 1/2 x 1/16" metal hold-down strips - they have one or more bends that are required for proper function.
Never unplug or plug in motors with the power cord connected — this can damage the motor driver circuit.
When manually moving the carriage, do so gently to prevent the motor generating back current into the driver. Similarly, do not pull media through the pinch rollers quickly.

Inspect Shipment

Please check for and promptly report any damage to shipping boxes or shipping tubes. Contact staff@krexil.com with photos of any damage.

You should have:

(1) Side panel with controller and 1 or 2 stepper motors
(1) Side panel with labels and side insert
(6) round metal bars
(2) square metal bars
(2) hold-down strips (some models have intentional bends and a slight arc)
(1) Small box containing:
1. (1) power pack
2. (1) carriage with two carriage arms
3. (3 or 4) rubber O-rings
4. (1) black timing belt
5. (1) small bag of parts
6. (1) blade assembly
7. (2) roll clamps
8. (2) round inserts for 3 inch core rolls

Final cutter assembly

If you received a shipping tube

Lay the tube flat on a table.
At each end, rotate the small tabs to release the locking ring from the metal disc.
Use a flat-head screwdriver to pry the locking ring away from the tube wall and remove the metal disc.
Caution: Do not bend the hold-down strip — it has a bend at one end and, on larger models, a gentle arc throughout, which is required for proper function.
Slide the contents out horizontally onto the table.
Remove bars from the shipping retainers one by one, then remove any tape.

Unpack box(es)

Open the shipping box or boxes and remove the cutter parts, small parts box, power supply, and hardware.
Place the side panels, bars, strips, and small parts on a work table.

If you received a stepper motor, about 5 inches long, packed separately

Spacer for stepper motor — Locate the flat black square motor spacer with four holes. Place the spacer on the feed motor side panel over the four panel holes.

Choose text or audio

Use the Play and Pause buttons for spoken guidance so you can focus on the machine with less switching back and forth to the screen.

Pace Repetition

Frame

3) Using the short (15mm) screws attach 3 narrow round bars to left side (left in photo) and tighten. LOOSELY screw rear bar (top in photo) to right side. — With three 15mm screws, fasten the narrow round bars to the feed motor side panel near the bottom and one above the side inserts (not shown here). Tighten the screws. Affix the right side panel only to the rear bar, then loosen the screw about 5 turns. (Please note that factory assembly, testing, and disassembly of your machine may have resulted in minor surface marks on the side panels.)

4) Locate the drive/O-ring bar with a square hole at one end. Slide large rubber O-rings onto the bar - 2 for 12-24" models, 3 for 36-48", 4 for the 60" model. Mate the bar with the feed motor cam and to the hole in the right side. VERY LOOSELY screw the front lower bar to the right side panel. Locate the feed idler bar that has bearings that turn freely at each end and mount it on top of the drive/O-ring bar and lock in with a screw into the upper thin bar. Tighten all 3 screws. — Find the drive/O-ring bar, which has a square or cross-shaped hole on one end. Slide large rubber O-rings onto the bar - two for 12-24 inch models, three for 36-48 inch models, or four for the 60 inch model. Space the O-rings equally, starting about 7 inches from the ends. Use the provided O-ring aligner tool to push against the O-rings to straighten them on the bar.

Fit the square or cross-shaped end of the drive/O-ring bar onto the feed motor cam and into the hole in the opposing panel. Screw the front lower narrow bar to the right side panel and then loosen the screw about 5 turns.

Find the feed idler bar, which has free-spinning bearings at both ends and install it directly above the drive/O-ring bar, locking it in place with a screw through the upper narrow bar. Tighten the three right-side screws.

Position the rear square bar as shown. — Pass the rear square bar rightward a few inches through the window in the right side.

Insert the bar left end into the left side insert. The right end should drop into place to level the bar. — Insert the left end of the rear square bar into the left side insert, which should drop the right end into the right side insert, leveling the bar.

Carriage

Handle blade assembly with gloves. — Put on gloves before handling the blade assembly.

Rotate the carriage to point to you and snap bearing into clamp. — Rotate the carriage so the bearings face you. With gloves, snap the blade assembly into the clamp on the carriage. If your machine came with a fixed blade, mount it to the carriage with the provided screws and nuts.

Rotate carriage so blade is pointing down. Gently lift the carriage spring arm near the rear square bar to clear the bar. — Rotate the carriage so the blade points down toward the work table. As you rotate it, while staying away from the blade, gently lift the carriage arm to clear the rear square bar.

Gently slide carriage to left. — Gently slide the carriage to the left panel.

Bars

For 24-60 in models position the front square bar as shown. For the 12 in model remove the small screw from the side insert and slide the bar through the smaller window from the outside. — Install the front square bar in a similar fashion as the rear bar.

Locate the rear hold-down strip without an angled notch. — Find the rear hold-down strip, which does not have a notch on one end.

Position as shown. — Pass the rear hold-down strip a few inches through the window in the right panel. While most configurations have no bend on this rear hold-down strip, if your configuration has a slight bend on both hold-down strips, make sure the bend is ramping up and on the left.

Slide the rear hold-down strip under the rear bearing of the carriage and into the left side insert. If the right end sticks out from the side insert by ~1/4 inch you did not get the left end into the side insert. When the right end is about flush with the outside of the side insert, lift up the center of the rear hold-down strip about an inch while pressing down on the right end to get the right end to seat in its groove. — Slide the rear hold-down strip under the rear carriage bearing and into the left side insert. If the right end of the rear hold-down strip sticks out about 1/4 inch past the right side insert, the left end is not seated and must first be resolved. Verify that the right end is about flush with the outside of the right side insert. Lift the center of the rear hold-down strip about an inch while pressing down on the right end so it snaps into its groove.

Locate the front hold-down strip with a bend and a notch and mount it on the front square bar. — Install the front hold-down strip with a square or angled notch on the front square bar similarly with the bend ramping up on the left.

Slide the front hold-down strip towards the carriage. — Slide the front hold-down strip along the front square bar toward the carriage. Keep the strip flat and aligned with the front side insert openings.

Press down to guide the front hold-down strip under the hold-down bearing and then slide into the left side insert. Notice that the front hold-down strip has a gentle bend that allows material to pass through - do not change the bend. — Press down gently to guide the front hold-down strip under the front hold-down bearing. Slide the front hold-down strip into the left side insert. Lock the right end as done with the rear hold-down strip.

Belt

Final step of belt insertion — Remove any twist in the belt.

Locate the shown idle bearing module. Insert it into the rectangular cutout from the outside of the panel with the small flange pointing up. Thread the belt under the bearing (as shown) and then (not shown) around the bearing and back over the carriage. — If not already installed, insert the belt idler in the rectangular cutout from the outside of the right panel. Face the small flange up. Thread the belt around the bearing and back over the carriage.

Thread around sprocket. — Route the belt around the motor sprocket.

Inserting the carriage belt — Pull the free end of the belt back to the carriage. With significant tension on the belt, insert it into the carriage slot.

Tension

Roll

Large clamp — Insert the provided screws and nuts into the two roll clamps.

Material roll mounted — Slide the material roll onto the roll support bar. Slide a roll clamp onto the roll support bar at each end of the roll.

Place the roll support bar onto the frame with the material coming off the bottom towards the front of the machine. For most materials, position the roll so the left edge of the roll is 3.5 inches from the left side panel. For elastic films, center the roll on the roll support bar instead.

Gently tighten both roll clamps so the roll cannot slide on the roll support bar.

Apply the stick-on label marked "LEFT" to the left end of the roll support bar. This helps install it the same way when changing rolls.

Final

Travelclamp — Find the small C-clamp. Note that it is designed to stretch enough to snap over the carriage travel bar. Snap it onto the carriage travel bar near the right side of the machine. Insert the screw into the C-clamp, but do not tighten it yet. Postpone this step until after you set the cut width and make a few test cuts. Then slide the clamp to the far left; do a cut to position the clamp; and tighten the clamp. The clamp helps the carriage return fully to the home position.

Remove the hold-down strips to prepare to thread the roll material. You will need to lift the center of each hold-down strip about an inch to release the right end of the hold-down strip from its groove. — Before threading roll material, remove both hold-down strips. For each hold-down strip, lift the center about an inch to release the right end from its groove, then slide the hold-down strip out carefully.

Power pack — Plug the power pack into a wall outlet.

Power jack — Plug the round power jack into the matching power socket on the controller.

Power switch — Move the toggle switch away from the metal frame to turn the controller on. During normal use, you can usually leave this switch on because the controller sleeps automatically and wakes when a key is pressed.

OLED display — Use the 3-dot menu button to select Jog. Press the arrow button pointing to the front of the machine and verify that the top of the O-rings move towards the font of the machine. If not refer to the user guide page to change the YDir setting in the Hardware menu.

Test and configure

Test motors

Move to the front of the machine and press the red [X] reset button.
Verify that the display shows “Length” and you hear a few beeps.
User the up/down buttons to enter 1.
Verify that the carriage moves when you press the [✔] button.
Verify that the material feed bars turn when you press the [✔] button again.

Configure 48 inch and wider feed motor torque

Disconnect power before opening the controller.
Open the controller.
Turn the small potentiometer on the Y axis driver counterclockwise (CCW) to reduce torque or clockwise (CW) to increase it.

Select inch vs mm etc.

Navigate to the Unit setting and select your desired unit of measure and press [-] to escape.

Set roll width

Navigate to the Width setting and enter your roll width.

Adjust carriage clamp

Spread the small C-clamp and snap on to the carriage travel bar at far right.
Loosen the C-clamp screw so it slides easily and gently slide it with the carriage to the far left.
Press [✔] to properly position the c-clamp.
Without moving the clamp, rotate it to not touch the belt and tighten the screw so it won’t move.
Press [ ✔] and verify the carriage moves to touch the clamp and back to the feed motor side panel. If you hear a grinding noise go to step 1.

Final assembly complete! See User Guide.

Included accessories

Two small L-shaped brackets with wood screws, machine screws and nuts are provided to attach the machine to a worktable for safety.

A provided guide fence can be installed to help prevent the material moving due to cut pressure. Install the fence only if you experience the material getting out of line with the roll. Clamp it onto the lower rear bar with the provided screw and nut. Position it near the right side of the roll when viewed from the front of the machine.

A small plastic rectangle is provided to offer an alternate way to hold the blade. For some types of material this method provides a cleaner cut. To use this method, using gloves for safety, disassemble the standard blade assembly and attach the blade to the rectangle with the spacer washers. Remove the clamp from the carriage and replace it with the new assembly. For unusual materials, Krexil can provide additional variations of the fixed blade holders.

Optional accessories are available for customers who need them.