Operating Instructions and Parts Manual
Digital Read Out
For JWDS-2244, JWDS-2244OSC, JWDS-2550 JET Drum Sanders
JET
427 New Sanford Road
LaVergne, Tennessee 37086
Ph.: 800-274-6848 www.jettools.com
Part No. M-723552
Edition 1 06/2018
Copyright © 2018 JET
Unpacking
Open the DRO carton and compare contents with the following parts list to make sure all parts are intact. Missing parts, if any, should be reported to your distributor. Report any shipping damage immediately to your distributor and shipping agent.
Read this manual thoroughly for correct assembly procedures.
Shipping contents
1 DRO unit – A
1 Upper mounting bracket – B
1 Lower mounting bracket – C
2 Batteries D
4 Socket hd cap screws M6x10 – H1
4 Flat washers M6 – H2
2 Phillips pan hd screws M3x5 – H3
1 Socket hd cap screw M5x12 – H4
1 Flat washer M5 – H5
1 Hex nut M5 – H6
Note: The unit may contain additional hardware for mounting to other machines.
Tools needed for assembly
4mm, 5mm hex wrenches
Adjustable wrench
Cross-point (Philips) screwdriver
Installation
Refer to Figure 2 to install the DRO unit on the motor shroud of the Drum Sander.
Use the slots on unit and brackets to adjust scale to vertical, then tighten all screws. Make sure digital display slides smoothly along the scale as sander drum is raised and lowered.
User-maintenance
• Check periodically that the screws holding the device to the sander are tight. Perform realignment if needed.
• Before using the device, wipe down the vertical scale with a dry, soft cloth. Do not use cleaning solutions. Do not allow any liquids
(such as machine oil) to contact the body of the digital display. Keep the device clean.
• If a functional problem occurs, refer to
Troubleshooting in Table 1.
• Turn off DRO after use to conserve battery.
Figure 1: contents
Figure 2: installation
Functions of digital scale
Figure 6 identifies the parts of the digital scale. The button functions are discussed below, followed by a section giving practical examples of how to calibrate your settings, and how these functions can be used for daily sander operations.
This device uses a 1.5-volt battery cell (SR44 or G-
13A). If it needs replacing, slide off the battery cover and insert the battery, with the positive pole of the battery facing out.
Note: After replacing a battery, the digital display setting defaults to zero and needs to be reset as described in the Setting the DRO section.
LCD
Figure 3
MM/INCH
Pressing this button toggles back and forth between imperial (inches) and metric (mm), and can be done at any time without affecting saved settings.
ON/OFF/ZERO
– power and zero-setting
Press ON/OFF button no longer than 3 seconds to power on.
Press ON/OFF button at least 3 seconds to shut off the digital display.
While in relative mode, press ON/OFF/ZERO (no longer than 3 seconds) to set current position as relative zero point.
While in absolute mode, press ON/OFF/ZERO (no longer than 3 seconds) to set current position as absolute zero point.
ABS
– relative/absolute modes
The device is in absolute mode as soon as power is turned on, and displays absolute zero. Moving the sanding drum up and down begins absolute measurement. Absolute measurement is set based upon the distance from drum to conveyor table, and thus represents the thickness of your board.
Press ABS button (no longer than 3 seconds) to switch to relative mode. “INC” will appear on the display. The value shown is in relative mode; it is an incremental position that can be zeroed at any point and determines not the thickness of a board, but how much material will be removed from it.
Moving the drum up and down will now display relative measurement until you press ABS again to go back to absolute.
IMPORTANT: Always place the digital display in relative (“INC”) mode before turning it off. If you turn it off while in absolut e (“ABS”) mode, your absolute setting will default to zero.
SET
– preset a value
Press SET; the indicator will flash “SET”. Press and hold the SET button and each digit flashes in turn. When the digit you want flashes, release the
SET button. Press SET button once (no longer than 1 second) and that digit will increase by one each time SET is pressed. When finished, press and hold SET button until indicator “SET” flashes, then press SET again (no longer than 1 second).
The indicator “SET” disappears and the value you just input is displayed on the screen.
From this point on, any drum movement will be based off this setting. The setting will be kept in the device’s memory even when the digital display is turned off, and only needs re-setting after a battery has lost charge and needs replacing.
HOLD
The Hold button is used to record a critical setting for reference for the purpose of later resetting to that same position.
For example, if a board becomes jammed during sanding:
1. Press the HOLD button. The dimension is
"frozen" in the display.
2. Raise the drum and remove the jammed board.
3. Make a mental note of the "frozen" dimension
(from Step 1).
4. Press HOLD again to return to normal measurements
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5. Adjust the drum back to its original (frozen display) position.
NOTE: The HOLD button will not permanently save a setting. When the button is pressed a second time, the number disappears.
TOL
– tolerance setting
This function is not generally used in sanding operations, but is here explained for reference.
Press TOL, and an up-arrow indicator will appear, as well as a flashing “SET” indicator. You can now change the upper tolerance limit. Hold down the
TOL button and each digit flashes in turn. When the digit you want flashes, release the TOL button.
Press TOL button once (no longer than 1 second) and that digit will increase each time TOL is pressed.
When finished, press and hold TOL button until indicator “SET” flashes. While indicator “SET” is flashing, press SET button to change the arrow to the down-arrow indicator. You can now change the lower tolerance limit in the same manner as you changed the upper tolerance limit.
When finished setting the lower tolerance limit, while indicator “SET” is flashing, press SET button
(no longer than 1 second). The device is now in tolerance measuring mode. When the up-arrow indicator is displayed, it means the measured value is beyond the upper limit. When the down-arrow indicator is displayed, the measured value is below the lower limit. When the display shows an “OK” indicator, the measured value is within tolerance.
Calibration and operation
Scale alignment
The scale should be in vertical position, and the digital device should slide smoothly along the full length of the scale. Check occasionally that the screws holding the device to the sander are tight. If any realignment of the scale should be needed, slots are provided in the mounting brackets.
Establish absolute zero
One of your first steps should be to “zero” the digital scale in absolute mode. This is equivalent to finding the exact point of contact between the sanding drum (with abrasive installed) and the table.
Open the drum cover and lower the drum while rotating it slightly. When drum contacts conveyor table and can no longer be rotated, set the DRO to zero.
Note: This setting may need to be repeated if a new abrasive of different thickness is installed.
Using relative measurement mode
The absolute setting, for which you should have already established the zero point, gives the width of your finished board after sanding (distance from drum to table).
The relative measurement mode is useful for measuring only the amount of stock that you wish to remove (i.e., depth of cut), and eliminates having to add or subtract to find the proper setting. It is especially helpful when sanding multiple boards to the same thickness.
Here is an example using relative measurement:
1. You have sanded a board at a setting of one inch at absolute measurement. Do not move the drum from this position. You wish to increase the depth of cut on the next run by
0.063 inches.
2. Press ABS button to activate relative measurement mode (“INC” will appear on the display).
3. Follow the previous instructions on using the
SET button function. You would input zeros for all digits, thus establishing zero setting for relative measurement mode.
4. After setting relative zero, move the drum down until the digital display reads “.065” inches in relative measurement mode. You can now sand your board with exact results. Of course, you can now toggle back and forth between relative and absolute mode (by pressing ABS button) and get both stock thickness and depth of cut readings at the same time.
More uses
The digital scale has been designed to save the operator time and energy, leading to increased productivity. As you become proficient with the use of the digital readout and explore how to use one function in conjunction with another, you’ll be able to tailor its functions to suit your own work habits and sanding needs.
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Troubleshooting DRO unit for JWDS-2244/-2244OSC/-2550 Drum Sanders
Correction
Flashing digits.
Locked digits.
No display.
Displays only ‘0000’.
Low voltage.
Haphazard memory.
Poor contact of battery.
Low voltage.
Short-circuit of zero setting spring and slider signal source.
Replace battery.
Take battery out, wait thirty seconds, then re-insert it.
Improve battery contact.
Replace battery.
Remove frame and adjust spring.
Function buttons won’t work.
Distortion of springs from over-pressing. Remove frame and adjust springs.
Table 1
CALIFORNIA PROPOSITION 65 WARNING: This product contains chemicals known to the State of California to cause cancer, or birth defects or other reproductive harm. Wash hands after handling.
Ordering Replacement Parts
To order parts or reach our service department, call 1-800-274-6848 between 8:00 a.m. and 5:00 p.m. (CST),
Monday through Friday. Having the Model Number and Serial Number of your machine available when you call will allow us to serve you quickly and accurately.
The specifications in this manual were current at time of publication, but because of our policy of continuous improvement, JET reserves the right to change specifications at any time and without prior notice, without incurring obligations.
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Digital Readout for JWDS-2244/-2244OSC/-2550 Drum Sanders – Exploded View
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Digital Readout for JWDS-2244/-2244OSC/-2550 Drum Sanders – Parts List
Index No Part No Description Size Qty
................. 723552 ..................... Drum Sander DRO (includes #1 thru 11) ............. ......................................
1 ............... TS-1503021 ............. Socket Head Cap Screw ...................................... M6-1.0P x 10L ............ 4
2 ............... TS-1550041 ............. Flat Washer .......................................................... 6.5 x 13 x 1T mm ........ 4
3 ............... TS-1540031 ............. Hex Nut ................................................................ M5-0.8P ...................... 1
4 ............... JWDS2244-504 ........ Upper Bracket ...................................................... .................................... 1
5 ............... JWDS2244-505 ........ Lower Bracket ...................................................... .................................... 1
6 ............... JWDS2244-506 ........ Phillips Round Hd Machine Screw ....................... M3-0.5P x 5L .............. 2
7 ............... JWDS2244-507 ........ DRO ..................................................................... 0-150mm scale ........... 1
8 ............... TS-1550031 ............. Flat Washer .......................................................... 5.1 x 10 x 1T mm ........ 1
9 ............... TS-1502031 ............. Socket Head Cap Screw ...................................... M5-0.8P x 12L ............ 1
10 ............. 15S-601 ................... Battery Cover ....................................................... .................................... 1
11 ............. 15S-600 ................... Battery (not shown) .............................................. .................................... 2
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Warranty and service
JET warrants every product it sells against manufacturers’ defects. If one of our tools needs service or repair, please contact Technical Service by calling 1-800-274-6846, 8AM to 5PM CST, Monday through Friday.
Warranty Period
The general warranty lasts for the time period specified in the literature included with your product or on the official
JET branded website.
• JET products carry a limited warranty which varies in duration based upon the product. (See chart below)
• Accessories carry a limited warranty of one year from the date of receipt.
• Consumable items are defined as expendable parts or accessories expected to become inoperable within a reasonable amount of use and are covered by a 90 day limited warranty against manufacturer’s defects.
Who is Covered
This warranty covers only the initial purchaser of the product from the date of delivery.
What is Covered
This warranty covers any defects in workmanship or materials subject to the limitations stated below. This warranty does not cover failures due directly or indirectly to misuse, abuse, negligence or accidents, normal wear-and-tear, improper repair, alterations or lack of maintenance. JET woodworking machinery is designed to be used with Wood.
Use of these machines in the processing of metal, plastics, or other materials outside recommended guidelines may void the warranty. The exceptions are acrylics and other natural items that are made specifically for wood turning.
Warranty Limitations
Woodworking products with a Five Year Warranty that are used for commercial or industrial purposes default to a
Two Year Warranty. Please contact Technical Service at 1-800-274-6846 for further clarification.
How to Get Technical Support
Please contact Technical Service by calling 1-800-274-6846. Please note that you will be asked to provide proof of initial purchase when calling. If a product requires further inspection, the Technical Service representative will explain and assist with any additional action needed.
JET has Authorized Service Centers located throughout the
United States. For the name of an Authorized Service Center in your area call 1-800-274-6846 or use the Service
Center Locator on the JET website.
More Information
JET is constantly adding new products. For complete, up-to-date product information, check with your local distributor or visit the JET website.
How State Law Applies
This warranty gives you specific legal rights, subject to applicable state law.
Limitations on This Warranty
JET LIMITS ALL IMPLIED WARRANTIES TO THE PERIOD OF THE LIMITED WARRANTY FOR EACH PRODUCT.
EXCEPT AS STATED HEREIN, ANY IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A
PARTICULAR PURPOSE ARE EXCLUDED. SOME STATES DO NOT ALLOW LIMITATIONS ON HOW LONG AN
IMPLIED WARRANTY LASTS, SO THE ABOVE LIMITATION MAY NOT APPLY TO YOU.
JET SHALL IN NO EVENT BE LIABLE FOR DEATH, INJURIES TO PERSONS OR PROPERTY, OR FOR
INCIDENTAL, CONTINGENT, SPECIAL, OR CONSEQUENTIAL DAMAGES ARISING FROM THE USE OF OUR
PRODUCTS. SOME STATES DO NOT ALLOW THE EXCLUSION OR LIMITATION OF INCIDENTAL OR
CONSEQUENTIAL DAMAGES, SO THE ABOVE LIMITATION OR EXCLUSION MAY NOT APPLY TO YOU.
JET sells through distributors only. The specifications listed in JET printed materials and on official JET website are given as general information and are not binding. JET reserves the right to effect at any time, without prior notice, those alterations to parts, fittings, and accessory equipment which they may deem necessary for any reason whatsoever. JET ® branded products are not sold in Canada by JPW Industries, Inc.
Product Listing with Warranty Period
90 Days – Parts; Consumable items
1 Year – Motors; Machine Accessories
2 Year – Metalworking Machinery; Electric Hoists, Electric Hoist Accessories; Woodworking Machinery used for industrial or commercial purposes
5 Year – Woodworking Machinery
Limited Lifetime – JET Parallel clamps; VOLT Series Electric Hoists; Manual Hoists; Manual Hoist
Accessories; Shop Tools; Warehouse & Dock products; Hand Tools; Air Tools
NOTE: JET is a division of JPW Industries, Inc. References in this document to JET also apply to JPW Industries,
Inc., or any of its successors in interest to the JET brand.
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427 New Sanford Road
LaVergne, Tennessee 37086
Phone: 800-274-6848 www.jettools.com
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