Manual Ferm MD-500 (page 9 of 26) (English, German, Dutch, French)

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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.

INCH

nABC

48 70 79

40 70 84 79

32 105 98 49

24 98 40

20 70 84 40

16 56 84 40

14 49 105 50

12 49 98 40

11 49 105 39

8 50 105 28

Pitch Starting Nr. of teeth per wheel

(mm) (mm) A B C

0.4 0.04 49 - 105

0.5 0.05 70 - 84

0.7 0.07 70 98 84

0.8 0.08 105 98 49

1.0 0.1 98 - 42

1.25 0.125 84 105 42

1.5 0.15 105 - 28

1.75 0.175 84 98 28

2.0 0.2 49 98 42

2.5 0.25 63 105 28

3.0 0.3 49 105 30

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

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Ferm MD-500 Manual

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