Festool Domino DF 500 User Manual download pdf (Page 25)

Instruction Manual 25

Troubleshooting

Symptom Possible Causes

Motor does not start ► Check that the cord is properly plugged into an outlet.

► Make sure the Plug-it connector is properly inserted and fully tightened.

► Make sure the outlet has power. Check the circuit breaker or try another outlet.

► 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.

► Inspect the power cord (including extension cords) for damage or missing prongs.

► The motor brushes may have worn and need replacement.

Plunging action is not smooth ► 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 ► Make sure you hold the Domino joiner firmly in position while plunging the mortise

slot.

► Make sure the mortise width setting is correct.

► Make sure you are using the correct mortising bit for the size of the Domino tenon.

► The Domino tenons may have shrunk in an overly dry or warm environment. This is

normal wood movement.

► Check the mortising bit to ensure it is not bent. A bent bit will make a thicker and

wider mortise slot than desired.

► Plunging too fast can cause the mortise slot to be enlarged.

Domino tenons are too tight ► 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.

► 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.

► Check the calibration of the horizontal position gauge (sight gauge).

► Don’t plunge the mortising bit into the work too fast. This may cause the joiner to

move during the plunge.

► Make sure the friction pads on the front of the joiner are not worn, damaged, or

missing.

Workpiece joints are

misaligned vertically

► Take care not to tilt the joiner while plunging.

► If the mortise slots were registered from the bottom of the baseplate, make sure

there is no dust or debris under the joiner.

► Make sure the fence is properly locked at the desired height setting.

► Inspect the fence height adjustment lock to ensure it is not broken (slipping).

Tilted or misaligned mortise

slots

► Make sure the fence is set to the correct angle (e.g. 90 degrees).

► 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.

► Plunging too slow can cause the mortise slots to be tilted slightly.

Workpiece joint won’t close

(gaps between pieces)

► Make sure the proper plunge depth is set.

► Make sure the mortising bit is not broken.

► Make sure the joiner is tight to the face of the workpiece.

► The mortising bit may have been sharpened too many times and is too short.

► Excessive dust may be present inside the linear slide.

► Excessive glue may be present at the bottom of the mortise.

Tearout or rough mortise slots ► Plunging speed too fast. Slow down the rate of your plunge.

► 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

► The plunge speed is too fast and the bit is not cutting the sides properly. Slow

down the plunge speed.

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Festool Domino DF 500 User Manual Page 25

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