Festool Domino DF 500 - Manual (Page 25)

Instruction Manual 25
Troubleshooting
Symptom Possible Causes
Motor does not start
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Check that the cord is properly plugged into an outlet.
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Make sure the Plug-it connector is properly inserted and fully tightened.
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Make sure the outlet has power. Check the circuit breaker or try another outlet.
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If used with a Festool dust extractor, make sure the selector switch is pointing to
"Auto". The auxiliary outlet on the dust extractor has power only when the selector
is at Auto.
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Inspect the power cord (including extension cords) for damage or missing prongs.
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The motor brushes may have worn and need replacement.
Plunging action is not smooth
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Clean the linear rails and bronze bearings of the plunge slide, and make sure they
are properly lubricated (refer to the
Routine Maintenance instructions on page 20).
►
Inspect the linear bearings for damage. Improper insertion of the fence body onto
the motor housing can damage the linear bearings.
Domino tenons are too loose
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Make sure you hold the Domino joiner firmly in position while plunging the mortise
slot.
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Make sure the mortise width setting is correct.
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Make sure you are using the correct mortising bit for the size of the Domino tenon.
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The Domino tenons may have shrunk in an overly dry or warm environment. This is
normal wood movement.
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Check the mortising bit to ensure it is not bent. A bent bit will make a thicker and
wider mortise slot than desired.
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Plunging too fast can cause the mortise slot to be enlarged.
Domino tenons are too tight
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The most common cause for this is that the tenons are stored in a humid
environment, and they have swelled from moisture absorption. Store the tenons in
a cool dry environment.
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The mortising bit may have been improperly sharpened or sharpened too many
times. Replace the bit.
Workpiece joints are
misaligned horizontally
►
Make sure the workpiece is securely clamped before plunging.
►
Check the calibration of the locating pins.
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Check the calibration of the horizontal position gauge (sight gauge).
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Don’t plunge the mortising bit into the work too fast. This may cause the joiner to
move during the plunge.
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Make sure the friction pads on the front of the joiner are not worn, damaged, or
missing.
Workpiece joints are
misaligned vertically
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Take care not to tilt the joiner while plunging.
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If the mortise slots were registered from the bottom of the baseplate, make sure
there is no dust or debris under the joiner.
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Make sure the fence is properly locked at the desired height setting.
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Inspect the fence height adjustment lock to ensure it is not broken (slipping).
Tilted or misaligned mortise
slots
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Make sure the fence is set to the correct angle (e.g. 90 degrees).
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Make sure to hold the Domino joiner firmly to the work surface.
►
When tightening the height adjustment clamp lever, make sure the fence is not
being skewed. Try wiggling the fence slightly as you tighten the clamping lever.
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Plunging too slow can cause the mortise slots to be tilted slightly.
Workpiece joint won’t close
(gaps between pieces)
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Make sure the proper plunge depth is set.
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Make sure the mortising bit is not broken.
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Make sure the joiner is tight to the face of the workpiece.
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The mortising bit may have been sharpened too many times and is too short.
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Excessive dust may be present inside the linear slide.
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Excessive glue may be present at the bottom of the mortise.
Tearout or rough mortise slots
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Plunging speed too fast. Slow down the rate of your plunge.
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Low-grade materials and plywoods will tear out more than solid woods. Decreasing
your plunging speed will improve the results but may not eliminate the problem
completely.
►
Dull or broken mortising bit.
Tapered mortise slot. The
Domino tenon fits only part
way into the slot
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The plunge speed is too fast and the bit is not cutting the sides properly. Slow
down the plunge speed.