Malfunctions
Version 1.0.3 - 2022-04-06 74 Translation of original instruction
D17 Pro│D23 Pro│D26 Pro│D33 Pro
EN
D17Pro_D23Pro_D26Pro_D33Pro_GB_8.fm
8 Malfunctions
Malfunction
Cause/
possible effects
Solution
Motor is hot • Wrong electrical connection of 400V
machines
•
Noise during work. • Spindle runs dry.
• Tool blunt or incorrectly clamped.
• Pulley on the motor has come
loose.
• Grease spindle
• Use new tool and check tension
(fixed setting of the bit, drill chuck
and taper mandril)
• Check the fastening of the pulley,
tighten the fastening nut.
Bit „burnt“ • Incorrect speed
• Chips are not coming out of the
drilled hole.
• Blunt drill bit.
• Operating without cooling agent.
• Choose a different speed, exces-
sive feed.
• Retract the drill bit from the bore
hole more often.
• Sharpen the drill bit or insert new
drill bit.
• Use coolant.
Drill point runs off, drilled hole
is not circular.
• Hard material or length of the cut-
ting spirals/or angles on the tool are
unequal
• Drill bit is bent.
• Use a new drill bit.
Drill is running non-round or
shaking
• Drill bit is bent.
• Bearings worn down in the spindle
head.
• Drill is not correctly clamped.
• Drill chuck defective
• Replace drill bit
• Have the bearings in the spindle
head replaced.
• Clamp the drill bit properly.
• Replace the drill bit chuck.
The drill chuck or the taper
mandrel cannot be inserted.
• Dirt, grease or oil on the taper
inside of the drill chuck or on the
taper surface of the drill spindle
• Clean surfaces well.
• Keep surfaces free from grease.
Motor does not start. • Motor is wrongly connected
• Defective fuse.
• Have it checked by qualified per-
sonnel.
Motor is overheating and
there is no power.
• Motor overloaded?
• Too low mains voltage
• Motor is wrongly connected
• Switch off immediately and have it
checked by qualified personnel
Precision of the work deficient • Heavy and unbalanced or deformed
work-piece.
• Inexact horizontal position of the
work-piece holder.
• Balance the piece statically and
secure without straining
• Adjust workpiece-holder
Drilling spindle sleeve does
not return to its initial position
• Spindle return spring •
„Img. 6-2: Spindle return
spring“ on page 48
Digital readout does not
match the spindle sleeve
travel
• Encoder (potentiometer) for drilling
depth electrical or mechanical
faulty.
• Check encoder (potentiometer),
replace if necessary.
Digital speed does not match
the speed table
• Deviations of ± 100 1 / min not
uncommon.
• not possible
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