REMS Unimat 75 Instructions D'emploi page 12

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remove the spacer plate. Now proceed as described for the mechanical
vice, chucking or unchucking the stock using the pedal switch.
4.6. Operating sequence
Close the safety cover (21). Switch on the machine (see 4.4 for speed se-
lection), start to cut the thread by operating the die lever (17) counter-
clockwise). Once 2 to 3 thread turns have been cut, feed is automatic.
Once the set thread length is reached, the closing lever (1) (Fig. 2) con-
tacts the triggering cam (2) (Fig. 4) and the dies open automatically. Move
the gear unit to the right by operating the die lever (17) clockwise. The die
head is closed again in the right-hand limit position. Now switch off the
machine (22) and remove the stock.
With Unimat 75, long threads up to 30 mm in diameter can be cut. Here,
the stock is passed through the gear unit and the motor (hollow shaft). Be-
fore the closing lever opens the die head, switch off the machine, open
the vice and move the die head (complete with workpiece) to the right-
hand starting position using the cutting lever (17). Now reclose the vice
and switch on the machine again. This procedure can be repeated as
often as required.
4.7. Special chucking means
For gentle chucking of bright-drawn round stock, round plastic bars etc.,
and for clamping of stud bolts and hexagonal screws, special clamping
jaws are available.
For nipple cutting, REMS Nippelfix is used, the automatic internally clam-
ping nipple chuck in 9 sizes from
the pipe ends are deburred on the inside, that the pipe sections are al-
ways pushed on as far as they can go, and that no nipples are cut which
are shorter than standard.
4.8. Hard-to-machine materials
For thread cutting on higher-strength materials (above approx. 500 N/mm
and on stainless steel, chaser dies made of HSS must be used.
5. Maintenance
Pull out the mains plug before any servicing or repair work. Such work
must be carried out only by experts and trained personnel.
5.1. Servicing
The REMS Unimat 75 and the REMS Unimat 77 are maintenance-free
at normal operation. The gear units have been provided with a permanent
oil or grease filling and require no further lubrication.
At heavy use, e.g. series production, the oil level of the REMS Unimat 75
gear has to be checked. Thereby loosen the screw plug with oil dip rod
(spare parts list Pos. 59), if necessary refill gear oil (Art.No. 091040 R1,0).
5.2. Inspection/maintenance
The container for the coolant must be cleaned at regular intervals. To do
so, drain off the coolant at the drain connection underneath the chip re-
moval pan.
If the closing lever – particularly without die set in the die head – can only
be moved with difficulty, the notice plate (24) (Fig. 2) on the die head must
be unscrewed. Dirt and chips can now be blown through – preferably using
compressed air. (Do not remove setting spindle (10)).
5.3. Sharpening of chaser dies
The best rake angle (Fig. 7) for general applications has been found to
be γ = 20°. The supplied setting gauge has a notch, which, as Fig. 8 sho-
ws, corresponds to the value 20°. For harder materials, it may be neces-
sary to increase the rake angle. On the other hand, it might be necessary
to reduce the value from to reduce the value of y when the chaser dies
catch (e.g. in thin-walled pipes, non-ferrous metals and plastics).
As a rule, the following empirical values apply:
Medium-strength steels (300–400 N/mm
stainless steel
High-strength steels
Non-ferrous metals
Plastics, e. g. rigid PVC (special die stock chaser)
For threads greater than 33 mm, an angle of 45° must be set on the die
stock chaser at the end of the clamping face (Fig. 7). This must be suffi-
cient to ensure that the die stock chaser does not project beyond the
sliding face (Fig. 10 (26)).
1 / " to 4". Care must be taken here that
2
2 ),
γ = 20°
γ = 20–25°
γ = 10–20°
γ = 0°
The die stock chaser is inclined in the holder in accordance with the thread
pitch. Angle δ must be set on the die stock chaser in accordance with this
angle of inclination (Fig. 9) so that, after installation in the holder, the tooth
crests of the die stock chaser lie on a plane parallel with the base of the
holder. In this process, a tolerance of +/– 0.05 mm must be observed. In
addition, when die stock chasers delivered retrospectively are installed,
attention must be paid to the angle of inclination in the holder, since it is
possible to install different die stock chasers in several holders for the pur-
pose of cutting fine threads.
Guide teeth are machined into certain die stock chasers to improve pitch
tolerance when cutting longer threads. These must be restored when the
die stock chaser is re-ground.
5.4. Setting the chaser dies in the holder
Care must be taken that the numbering of the chaser dies tallies with that
of the holder and that the fitting chucking plate does not project above the
holder faces. Projections must be removed if necessary (e.g. ground oft).
To set the chaser die in the holder (Fig. 10) to the dimension 55.4 mm in
the REMS Unimat 75 or to 95.4 mm in the REMS Unimat 77, the screw
of the chucking plate (25) is tightened securely. The stated dimension must
now be set using a dial gauge or the supplied setting gauge (Fig. 8) – as
shown in Fig. 10 – between the lower edge of the holder and the first tooth
after the initial cut. To do this, the die stock chaser must be pressed for-
ward by means of the adjusting screw on the underside of the holder. The
adjusting screw must be in contact with the die stock chaser under pres-
sure. In the case of the REMS Unimat 75, the distance of 55.4 mm (Fig.
10), with a tolerance of +/– 0.05 mm, must be observed. For smaller threads
(diameter 6–12 mm), it can be adjusted to 54.3 mm to good effect. It is,
however, important to maintain the tolerance of 0.05 mm within the 4 die
stock chasers of the die set. In the case of the REMS Unimat 77, it is ad-
visable to observe the specified distance, i. e. 95.4 mm +/– 0.05 mm.
2 )
6. Wiring diagram and equipment list
See Fig. 11.
7. Action in the event of faults
7.1. Fault:
Thread ragged, crests and split off.
Cause:
Blunt chaser dies.
•
Bad coolant.
•
Setting dimension of chaser in holder incorrect.
•
Wrong speed.
•
7.2. Fault:
Thread is badly cut, "ragged fine thread".
Cause:
Holder incorrectly inserted in die head. Comply with correct
•
sequence!
Chaser dies incorrectly fitted in holder. Comply with correct sequence!
•
Chaser dies in wrong holder model (inclination angle!).
•
7.3. Fault:
Thread not centered on the workpiece.
Cause:
Vice centering altered.
•
7.4. Fault:
Die head does not open far enough.
Cause:
Wrong closing lever fitted.
•
Closing lever worn.
•
Triggering cam worn.
•
7.5. Fault:
Die head does not close.
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