The Y-axis timing belt tensioning requires that the machine is turned off while measuring the tensions. This procedure can be performed by the machine operator as long as the following procedures are followed explicitly.
This procedure requires the use of a Melco 0-10 lb. Force Gauge a Universal Force Gauge Adapter, Y-Belt Tensioning Fixture, a 3mm Hex wrench, and a 7mm nut driver.
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CAUTION!! DO NOT over tension timing belts. If you do, the belts will stretch excessively and might cause heavy internal damage to the machine. |
Attach the Universal Force Gauge Adapter, PN 32498, to the 0-10 lb. Force Gauge, PN 995591-01 (screw adapter on the end of the gauge).
Remove the left and right red transparent arm covers (use 3mm hex wrench to remove screws).
Move the x-beam all the way to the front of the machine until it comes to a dead stop.
Figure 1 - X-Beam Position
Center the Y-belt tensioning fixture on top of the lower y-belt (see Figure 2).
Figure 2 - Checking Force
Push the force gauge (attached to adapter) down on the upper y-belt until the belt touches the Y-belt tensioning fixture. The force should read 8.1 ± 0.3 lbs.
Repeat steps 4 and 5 for the other side of the machine. If the belt tension on either side needs to be adjusted, proceed to the adjustment procedure.
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Note: If a BRECO meter is used to measure the tension, the measurement should be 45-50 Hz. |
Turn the machine ON if it is not already ON.
Color change to Needle 16.
Turn the machine OFF.
Using a 3mm hex wrench, remove the left upper arm front cover.
CAUTION!! Do not move the needlecase or turn the machine off and on while this cover is removed. If you proceed without this cover damage to the machine will occur. Disclaimer: Melco will not be held responsible for any damage to the machine from not performing this step.
Move the x-beam back and forth a few times, bring it to the front to a dead stop, then (using a 7mm nut driver), adjust the tension up or down at the tension adjusting nuts indicated in the image below. To increase the tension, turn both adjusting nuts clockwise by the same amount. To decrease the belt tension turn both adjusting nuts counterclockwise by the same amount. After adjusting, you must repeat steps 5 and 6 of the inspection.
Figure 3 - Y-Drive Timing Belt Adjusting Nuts
When the belt tension is set to specifications, reinstall the left upper arm front cover. DO NOT PROCEED until you have reinstalled the left upper arm front cover.
Turn the machine ON if it is not already ON.
Color change to Needle 1.
Turn the machine OFF.
Using a 3mm hex wrench, remove the right upper arm front cover.
CAUTION!! Do not move the needlecase or turn the machine off and on while this cover is removed. If you proceed without this cover damage to the machine will occur. Disclaimer: Melco will not be held responsible for any damage to the machine from not performing this step.
Move the x-beam back and forth a few times, bring it to the front to a dead stop, then (using a 7mm nut driver) adjust the tension up or down at the tension adjusting nuts indicated in the image below. To increase the tension, turn both adjusting nuts clockwise by the same amount. To decrease the belt tension turn both adjusting nuts counterclockwise by the same amount. After adjusting, you must repeat steps 5 and 6 of the inspection.
Figure 4 - Y-Drive Timing Belt Adjusting Nuts
When the belt tension is set to specifications, reinstall the right upper arm front cover. DO NOT PROCEED until you have reinstalled the right upper arm front cover.
Reinstall the left and right transparent arm covers.
Do a short machine functional test and observe correct y-axis movements. If the belts travel on the idler pulley off-center to the left or right, readjust the tension starting at the beginning of this section.
