Behaviour In Case Of Faults - REMS Unimat 75 Betriebsanleitung

eng
5. Maintenance
Notwithstanding the maintenance described below, it is recommended to have
the machine subjected to inspection and re-testing of electrical devices by
qualifi ed specialists at least once a year. Such re-testing of electrical devices
is prescribed in accordance with DIN EN 60204 and accident prevention regu-
lation DGUV (German Legal Accident Insurance Association) regulation 3
"Electrical systems and equipment". In addition, the respective national safety
regulations, rules and specifi cations valid for the application site must be
observed and followed.
5.1. Maintenance
WARNING WARNING
Pull out the mains plug before maintenance work!
REMS Unimat 75 and 77 are maintenance-free in normal operation. The gears
run with a life-long oil or grease fi lling and need no relubrication.
If the closing lever is diffi cult to move by hand, the complete universal automatic
die head must be cleaned thoroughly. To do this, it is best to remove the universal
automatic die head from the machine (see 3.1.). Dismantle the cover, closing
lever and die set and unscrew the label plate (Fig. 2 (24)) from the universal
automatic die head. Now dirt and chips can be blown through from above,
preferably with compressed air. The adjusting spindle (10) may not be removed
or adjusted! Clean the cover, square bar in the universal automatic die head
and die set with a clean, lint-free cloth. Remove stuck residue of thread cutting
material and dust with petroleum or benzene. Reinstall the closing lever, plate,
die set and cover, tighten the fi llister head screws (Fig. 4 (8)) and check the
smooth action of the closing lever. Remove the universal automatic die head
again if necessary and check the cover, square bar in the universal automatic
die head and die set for burr or other damage and remove this properly with a
fi ne fi le or oilstone.
In case of heavy stress, e.g. series production, the oil level in the gear must
be checked on the REMS Unimat 75. To do this, remove the screw cap with
oil dipstick (Fig. 11 (34)), wipe off the dipstick, screw back in completely, remove
again and check the oil level on the dipstick. The oil level must be between the
two marks at the end of the dipstick. Refi ll gear oil (Art. No. 091040 R1,0) if
necessary.
The tank for the thread cutting material in the machine stand must be cleaned
at certain intervals. To do this, remove, empty and clean the chip collector
(Fig. 4 (37)). Drain the thread cutting material at the drain nozzle (Fig. 1 (35))
and fi lter or dispose of properly. Clean the tank for the thread cutting material
thoroughly with cloths through the opening for the chip collector. Preferably fi ll
with new REMS thread cutting material.
Clean plastic parts (e.g. housing) only with REMS CleanM machine cleaner
(Art. No. 140119) or a mild soap and a damp cloth. Do not use household
cleaners. These often contain chemicals which can damage the plastic parts.
Never use petrol, turpentine, thinner or similar products for cleaning.
5.2. Sharpening the chase dies
The value γ = 20° has proven most effective as a cutting angle (Fig. 7) for
general applications. A notch which corresponds to the value γ = 20° has been
cut in the enclosed setting gauge (Fig. 8). It may be advisable to increase the

6. Behaviour in case of faults

6.1. Trouble: Thread is not cut cleanly, thread tips are torn off.
Cause:
● Blunt chase dies.
● Poor thread cutting material.
● Wrong setting of the chase dies in the holder.
● Wrong speed.
● Diffi cult to cut material.
● Wrong choice of material of the chase dies.
6.2. Trouble: Thread is cut badly, „inaccurate fi ne thread".
Cause:
● Holder inserted incorrectly in the universal automatic die head.
● Chase dies mounted incorrectly in the holder.
● Chase dies in the wrong holder type (angle of inclination).
6.3. Trouble: Thread not cut centrically on the workpiece.
Cause:
● Vice centring changed (pneumatic vice).
● Vice set incorrectly.
● Dies soiled or worn.
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cutting angle for harder materials. On the other hand, it may be necessary to
reduce the value of γ especially when the chase dies stick, e.g. with thin-walled
pipes, nonferrous metals and plastics. The following values generally apply
from experience:
Medium strength steels (300...400 N/mm²), high grade steel
High strength steels
Nonferrous metals
Plastics, e.g. PVC hard (special chase dies)
For thread diameters > 33 mm an angle of 45° must be made at the end of the
face on the chase dies (Fig. 7). This must be big enough so that the chase dies
do not protrude over the gliding surface (Fig. 10 (26)).
The chase dies are angled in the holder according to the thread pitch. According
to this angle, the angle δ (Fig. 9) must be applied to the chase dies so that the
teeth tips of the chase dies are on a level parallel with the base surface of the
holder after installation in the holder. A tolerance of ± 0.05 mm must be kept
here. The angle of inclination must also be observed when installing replace-
ment chase dies because different chase dies can be installed in several holders
to produced fi ne threads.
Guide teeth must be ground onto certain chase dies to improve the pitch toler-
ance for longer threads. These must be reground when regrinding the chase
dies.
5.3. Setting the chase dies in the holder
Make sure that the numbering of the chase dies matches the numbering of the
holders and that the mounted clamping plate including the screw does not protrude
over the holder surfaces. Chaser dies delivered already in holders are ground
to size at the factory and should fi t without modifi cation, clean the universal
automatic die head if necessary.
To set the chaser dies and the chamfering/peeling chasers in the holder to
dimension 55.4 mm in REMS Unimat 75 (Fig. 10) or 95.4 mm in REMS Unimat
77, the screw of the clamping plate (25) is only tightened far enough so that
the Strehler die and the chamfering/peeling chasers remain movable. The
specifi ed dimension must now be set with a dial gauge or the setting gauge
provided (Fig. 8) between the bottom edge of the holder and the fi rst tooth after
the cutting start (Fig. 10). To do this, the chase die is pressed forward with the
adjusting screw on the bottom of the holder. The adjusting screw must be under
pressure to the chase die. In REMS Unimat 75 the dimension 55.4 mm (Fig.
10) must be kept with a tolerance of ± 0.05 mm. For smaller threads (Ø 6 ...12
mm) it can be set preferably to 54.3 mm. However, it is important that the toler-
ance of ± 0.05 mm is kept within the 4 chase dies of a die set. For REMS Unimat
77 the value 95.4 mm ± 0.05 mm must be kept accordingly. After setting the
chaser dies and the chamfering/peeling chasers, tighten the screw of the
clamping plate (25).
5.4. Inspection / repair
WARNING WARNING
Pull out the mains plug before carrying out maintenance or repair work!
This work may only be performed by qualifi ed personnel. If the plug or power
cable needs to be replaced, this must be done by REMS or an authorised
REMS customer service workshop to avoid a safety risk.
Remedy:
● Sharpen or change chaser dies.
● Use undiluted REMS thread cutting material.
● See 5.3.
● Check speed setting, see 4.4.
● Adapt the cutting angle of the chaser dies according to 5.2.
● See 4.8.
Remedy:
● Check numbering of the holders, see 3.3.
● Check numbering of the chaser dies in relation to the holders, see 5.3.
● Check chaser dies in relation to holder type, contact an authorised REMS
customer service station if necessary.
Remedy:
● Contact authorised REMS customer service station.
● See 4.5.
● Clean or change clamping jaws.
eng
γ = 20°
γ = 20 ... 25°
γ = 10 ... 20°
γ = 0°