44 Ferm
THREAD-CUTTING
Next to the usual turning work you do with the MD-350 you
can also cut screw- thread with this machine. For this spe-
cial chisel have to be used. The technique of thread-cut-
ting is not very simple. For reaching a correct fit with thre-
ad-cutting, both the thread profile and the minor and outs-
ide diameter have to be very accurate. Therefore many
turners use existing machine screw taps. Screw plates
can be used in the same way, however a fitting holder has
to be made yourself. Cutting takes place with very low
numbers of revolutions( often 70 revolutions per minute)
or if need be by cranking, turning the main shaft with your
hands.
For the cutting of inchthread, a separate set of gears
is required. This set is not included. This set is availa-
ble at your dealer under Nr. 330961.
The continuously repeating distance between two perma-
nent points of a screw thread is called the thread haste. If
you are going to cut you always have to adjust this thread
haste. This happens by chosing a certain change wheel
com bination on the scissors. In fig.17 on the left side a
single transmission for thread-cutting is indicated ( a so-
called single work) and on the right side a double transmis-
sion for the automatical starting is indicated( so-called
double work). Through this the support is moved over a
certain distance during a rotation of the main shaft. In the
headstock two fixed transmission have been builded in,
namely 1 : 4 for thread haste and 1 : 40 for starting, which
decide the number of revolutions of the coaxial datum
axis. From this datum the end transmission has to be cal-
culated. For calculating this some formulas exist, but for
the sake of convenience we already indicated the most
current thread haste dimensions in the subjoined table. All
indicated wheels are delivered automatically with the ma-
chine! Installing or adjusting the change wheels happens
by shifting the scissors and the intermediate wheel axle
and by placing the filling rings. Adjust the change cog-
wheels margin.
Besides, in the table - second column- is mentioned how
the starting size by means of the same change wheels can
be adjusted.
Ferm 9
Annex 3
TRAVERSING SLIDE/APRON
Nr. Part
1. Handwheel lever
2. Socket head screww
3. Spindle Bearing
4. Spindle
5. Spindle nut
6. Castle locking nut
7. Vernier
8. Socket head screws
9. Socket head screws
10. Cross slide base
11. Key
12. Apron
13. Shaft for left and right hand
motion
14. Bearing cover plate
15. Handwheel
16. Bearing cover plate
17. Half nut lever
18. Half nut mechanism
19. Leadscrew and half nut
guide
20. Eye bolts and keys
21. Shaft for left and right hand
motion/ring
22. Bearing with 2 socket head
bolts
23. Gear wheel for left and right
hand motion
Anlage 3
LÄNGSSCHLITTEN/
SCHLOßKASTEN
Nr. Zubehörteil
1. Handradkurbel
2. Inbusbolzen
3. Spindellager
4. Spindel
5. Spindelmutter
6. Kronensicherungsmutter
7. Nonius
8. Inbusbolzen
9. Inbusbolzen
10. Querschlittenunterteil
11. Achsnagel
12. Schloßkasten
13. Welle Längsverstellung
14. Lagerabdeckplatte
15. Handrad
16. Lagerabdeckplatte
17. Schloßmutterkurbel
18. Schloßmuttermechanis-
mus
19. Leitspindel- und Schloß-
mutterführung
20. Achsnagelinbusbolzen
21. Welle Längsverstellung
22. Lager
23. Zahnrad Längsverstellung
Bijlage 3
LANGSSLEDE/SLOT-
KAST
Nr. Onderdeel
1 Handwielkruk
2 Inbusbouten
3 Spindellager
4 Spindel
5 Spindelmoer
6 Kroonborgmoer
7 Nonius
8 Inbusbouten
9 Inbusbouten
10 Dwarsslede onderstuk
11 Spie
12 Slotkast
13 As langsverstelling
14 Lagerafdekplaat
15 Handwiel
16 Lagerafdekplaat
17 Slotmoerkruk
18 Slotmoermechanisme
19 Leispindel- en slotmoerge-
leider
20 Spie-inbusbouten
21 As langsverstelling en ring
22 Lager met 2 inbusbouten
23 Tandwiel langsverstelling
Pièce annexe 3
CHARIOT LONGITUDIN-
AL/PALASTRE
N° Pièce
1. manivelle
2. boulons à 6 pans
3. roulement de broche
4. broche
5. écrou de broche
6. écrou de blocage à cre-
neaux
7. vernier
8. boulons à 6 pans
9. boulons à 6 pans
10. chariot transversal
11. clavette
12. palastre
13. réglage longitudinal
14. plaquette de protection de
roulement
15. roue à mains
16. plaquette de protection de
roulement
17. poignée à écrous de ver-
rouillage
18. mécanisme d'écrous de
verrouillage
19. broche glissière et conduc-
teur
20. boulons à 6 pans de clavette
21. essieu de réglage longitu-
dinal
22. roulement
23. roue dentée réglage longi-
tudinal
3
