VEVOR BS-0 Precision Dividing Head Dividing Head User Manual

DIVIDING HEADS
Operation Manual & Parts List

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 BS-0 Precision Dividing Head Dividing Head

These heads are suitable for milling grinding and drilling work. A plain dividing plate with 24 notches gives direct divisions of 2, 3, 4, 6, 8, 12 and 24. By indirect indexing (worm gear ratio 1:40) all divisions up to 50 and many above 50 can be carried out (see indexing chart).Divisions beyond the indirect indexing range are obtained by using the differential system which gives all divisions up to 1000.The indexing chart supplied with each head lists all divisions up to 380. Spiral milling work can also be carried out with BS-2dividing heads.
Construction: These attachments combine rigidity with accuracy. The indexing spindle runs in precision taper roller bearings virtually free of play. In contrast to conventional designs the direct indexing plate is mounted at the tapered front indexing spindle. Dividing head and indexing spindle can be swiveled frown horizontal to vertical. Indexing spindle, worm. direct indexing pin are hardened and ground.as well as centers and indirect indexing pin. The worm wheel is made of a special hard phosphor -—bronze. Worm and worm wheel as well as most of the other revolving parts rotate in oil.

Semi-Universal Dividing Head

ENCLOSURE:

1. Fixed tailstock

2. Carrier

3. Center for head and tailstock

4.  Direct indexing plate with 24  notches

5. Indirect indexing plate with 18 circles of holes 15-49
   A 15,16,17,18,19,20
   B 21,23,27 ,29,31,33
   C 37,39,41,43,47,49

6. 12 change gears for differential and spiral milling.(only BS—2)

7. Change gear quadrant and 2 bolts (only BS-2)

8. Flange plate

9. Test certificate

10. Operating instructions

11. Indirect dividing table

12. Differential dividing table (only fitting BS—2)

13. Table for spiral milling (only fitting BS-2)

THREAD SPINDLE:

Standard Accessories:

Semi Universal Index B&S Type
No.0 No.1 (Head-stock)
Unit: mm/inches

MODEL| A| B| H| a| b| g| Taper of center| Diameter of spindle hole
---|---|---|---|---|---|---|---|---
BS-0| 193
7.59| 131
5.15| 173
6.81| 100
3.93| 90 3.54| 16 0.63| B&S NO.7| 180.71
BS-1| 242
9.52| 168
6.16| 220
8.66| 128 5.04| 113 4.46| 16
0.63| B&S NO.9| 200.79

Unit: mm/inches

These heads are suitable for milling grinding and drilling work. A plain dividing plate with 24 notches gives direct divisions of 2, 3, 4, 6, 8, 12 and 24. By indirect indexing (worm gear ratio 1:40) all divisions up to 50 and many above 50 can be carried out (see indexing chart).Divisions beyond the indirect indexing range are obtained by using the differential system which gives all divisions up to 1000.The indexing chart supplied with each head lists all divisions up to 380. Spiral milling work can also be carried out with BS-2dividing heads. Construction: These attachments combine rigidity with accuracy. The indexing spindle runs in precision taper roller bearings virtually free of play. In contrast to conventional designs the direct indexing plate is mounted at the tapered front indexing spindle. Dividing head and indexing spindle can be swiveled from horizontal to vertical. Indexing spindle,worm.direct indexing pin are hardened and ground.as well as enterers and indirect indexing pin. The wormhole is made of a special hard phosphor bronze. Worm and wormhole as well as most of the other revolving parts rotate in oil.

Semi-Universal Dividing Head
ENCLOSURE:

1. Fixed tailstock

2. Carrier

3. Center for head and tailstock

4.  Direct indexing plate with 24  notches

5. Indirect indexing plate with 18 circles of holes 15-49
   A 15,16,17,18,19,20
   B 21,23,27 ,29,31,33
   C 37,39,41,43,47,49

6. 12 change gears for differential and spiral milling.(only BS—2)

7. Change gear quadrant and 2 bolts (only BS-2)

8. Flange plate

9. Test certificate

10. Operating instructions

11. Indirect dividing table

12. Differential dividing table (only fitting BS—2)

13. Table for spiral milling (only fitting BS-2)

THREAD SPINDLE:

Standard Accessories:

Universal Index B &S Type
No. 2 (Head-stock)
Unit: mm/inches

MODEL| A| B| H| h| a| b| g| taper of center| Diameter of spindle hole
---|---|---|---|---|---|---|---|---|---
BS-0| 193
7.59| 280
11.02| 236
9.29| 133
5.23| 212
8.35| 134
5.27| 16
0.63| B&S
NO.10| 25.4
1

Unit: mm/inches

0.63

FEATURES:
The BS-3 is designed and made according to characteristics and advantages to all kinds of dividing heads. suitable for general dividing. gear and rack spindle cutting.in many use.
Designed for super hole 55.5mm of diameter. Haft hole. Slope of end hole is Morse’ s taper No.6 and the BS-3 can be adjusted from being level of vertical(Q? ~90° )
All the BS-3’ s shaft. spindle center. worm and gear are made of super steels through grinding. heat treatment.to achieve rigid construction.
Its tailstock designed in dovetail joint. very strong in structure which is available for heavy—duty load. also the degree can be adjusted in every direction.
The ratio of worm and worm gear is 1:40.
The Dividing plate is available in two sides. A and B.A Face 24,25.28.30.34.37.39.41.42.43.BFace 46.47.49.51.53.54.57.58.59.62.66
The changeable gears are242832384044485664 7286 and 100
Standard accessories are: Center. Carrier. Gear Bracket. Gear Set.
Center Height of Tail Stock
Max.165mm
Min.38mm

132

**Adjustment of worm backlash

**

Any backlash between worm and worm wheel encountered after extensive operation is removed as follows:

1. Loosen locking boit and turn the stop screw so far until worm backlash has been taken out. In this respect however, a free turning of the hand crank should still be possible.
2. Tighten locking bolt.
   The worm backlash has been removed when no more play can be observed on the index head spindle.

Direct indexing
Swivel out the worm. For further indexing, loosen the spindle locking and life out the direct dividing index with the respective lever. The indexing spindle can then be turned by the desired number of holes, after which the direct dividing index is engaged again. In the case of relatively heavy work tighten the spindle locking as well. The standard equipment includes holes. Plate with 24 holes.
Rule: Divide 24 by the number of divisions required and the result equals the number of holes to move in the 24-hole rapid index plate. Thus, number of holes to move=24/D, where D is the number of divisions.

Indirect indexing

In this case swivel the worm carefully to the stop by means of the swivel lever, at the same time turning slightly the indexing spindle and then the hand crank. Disengage the direct dividing index. Operate clamping device for hole plate. Then take the following steps:

1. Look up circle of holes in the indexing table. lf the particular circle of holes is not visible on the index plate, remove hand crank and indicator bracket, remove index plate after loosening of holding screws and screw it on on again in reversed from.(The circles of holes stated are distributed over both sides of the index plate).
2. Adjust indicator bracket after loosening of locking screw in such a way that the number of holes which is also shown in the table remains uncovered between the legs.
3. Tighten locking screw
4. After loosening of central nut shift hand crank is such a way that the index pin can engage in a hole of the desired circle of holes. Do not misalign hand crank! After tightening the central nut ,it must be possible to engage the index of the hand crank in every desired hole of the circle.
5. Then engage the index of the hand crank in the starting position and turn the indicator bracket in indexing direction until the index lies flush to the inside of the second indicator led. (Note: If a + is shown behind the number of holes in the table. move the indicator bracket in the direction opposite to indexing until it contacts the index).
6. For further division disengage the index, turn the hand crank until the index can engage in the last hole before the second indicator leg.
7. If , by accident, the index has passed over the intended hole, the handle has to be turned back for several holes in order to engage the index in the right holes in handle chain in clockwise direction.
8. Clamp the indexing spindle for heavy work.

Example: Divisions D = 9. Then T = 40/9,or 4 turns plus 4/9 turn .
Multiply the fraction by a suitable number, say 2.Then 4/9 becomes 8/18.
Since you have an 18=hole circle, you will index 4 turns plus 8 spaces on the 18-hole circle.
Angular Indexing.
Because the dividing head is geared in a 40: 1ratio,one turn of the crate indexes the spindle 360/40=9° If the angular distance is in degrees only= «/9,where a is expressed in degrees.”
Example: To be milled 43° 20° apart,

We might index 4 turns plus 22 holes on the 27-hole plate.

Differential indexing **

**

This process is employed for all index numbers which cannot be obtained by indirect indexing in this case Clamp the differential bolt into the rear end of the indexing spindle and loosen the locking pin for the index plate.
Then attach the change gears as per indexing table on the bracket or the differential bolt and engage them with a minimum of slack. Then Carry out indexing.

Milling spiral flutes

A twisted flute generally found on twist drills, reamers, screw taps, screw wheels, worms etc. may be always performed by an universal or special dividing attachment if the milling machine used for this purpose is provided with a swiveling table or a swiveling milling spangle head. The Spiral is produced by two coincident movements: a straight- lined advancing movement by the milling table and a revolving movement of the workpiece caused by the table leadscrew through change gears gear spindle; worm spindle to the dividing head spindle. These motions are to bear a determinate constant and uniform mutual proportion.
The change gear ratio must be selected in such a manner that the course made by the rotation of the table leadscrew is equal to the lead” S” required on the workpiece . Moreover, the milling the milling table is to the swiveled its zero position to the inclined position corresponding to the spiral lead. The result is a constant perpendicular position of the cutter axis to the lead of the spiral produced.
As long as the milling table still rets in the zero position the cutter should be dressed exactly over the longitudinal axis of the workpiece.
Then, the milling table is to be swiveled until the longitudinal axis of the table and the cutter axis are forming the lead angle that will then agree with the spiral desired.
The direction of rotation of the desired spiral left-hand or righthand spiral) determinates the swiveling direction of the milling table which is to be swiveled in such a way that the workpiece during its rotating and forward movement is always moving towards the cutter.

APPLICATION OF CHANGE GEARS

REMARKS:
A:gear to be hanged on spindle arbor
B:moving wheel( Ι )
C:moving wheel( II)
D:gear rotation of gear case arbor
E:gear ( Ι ) to be hanged on bracket
F:gear (Il) to be hanged on bracket
G:gear case arbor
H:holes of dividing plate
N:rotation of crank handle
RLRS: bracket
S: spindle arbor

NOTICE
Take worm in mesh; loose indirect dividing plate; engage indirect dividing index; disengage direct indexing pin.
Rule of division: The change gear ratio “i” required for the desired flute and the setting angle “” of the milling table are obtained as follow:

s=lead of spingle for table
k=transmission ratio in the indexing attachment, mostly 40:1
s=lead of the desired spiral
i=transmission ratio of change gears
d=diameter of workpiece
ß =setting angle of milling table
Angle ß is found in the Table of Tangents at the corresponding value of tang ß
Example: How to mill a twist flute
Given: k=40:1 /S=12″/d=4”/s=1/4”

Wanted:
a) Setting angle of milling table
b) Change gears required

according to Table of Tanagers: angle ß =6°

Spiral surfaces surfaces (Archimedean spirals) on principle are milled in the same way as spiral flutes, the spindle of dividing head being driven by table leadscrew by means of change-wheels and gearing spindle.
cutter spindle and dividing head spindle must be set perpendicularly to each other or in a suitable angle respectively.

Semi-Universal Dividing Head
EXPLODED VIEW BS-0,BS-1

|
---|---
ARTS LIST For BS-0,BS-1| Teil Stock
Part No.| Description| Qty
---|---|---
PO1| Carrier| 1
P02| Hex. head bolt| 5
PO3| Center| 1
PO4| Round nut| 1
P05| Hex. socket cap screw| 3
P06| Direct indexing plate with 24 notches| 1
PO7|  Guide block| 1
PO8|  Line shaft| 1
P09|  Bearing| 1
P10|  Hex. socket cap screw| 3
P11|  Bearing base| 1
P12|  Helical gear| 1
P13| Round nut| 1
P14| Lock sleeve| 1
P15|  Hex socket cap screw| 1
P16| Setscrew| 2
P17|  Oil cap| 1
P18| Bearing thrust collar| 1
P19| Slotted round nut| 1
P20| Cross recessed countersunk head screw| 1
P21| Main body| 1
P22| steel ball| 1
P23|  Worm shaft| 1
P24| Ring| 1
P25| Sleeves| 1
P26|  Hex. socket cap screw| 2
P27|  Indirect indexing plate with 6 circles of hole| 1
P28|  Left index| 1
P29|  Right index| 1
P30| Plate| 1
P31| Cross recessed panhead screw| 1
P32|  Cross recessed panheads screw| 3
P33|  Limit shaft| 1
P34| spring| 1
P35| Control plate| 1
P36|  Pin| 1
P37|  Knurled handle| 1
P38| taper pin| 1
P39| Shaft washer| 1
P40| screw| 1
P41| Oilcups| 1
P42| Cross recessed pan head screw| 1
P43|  Limit plate| 1
P44|  Lock handle| 1
P45|  Handle| 2
P46| Rock| 1
P47| Limit bolt| 1
P48| Gear shaft| 1
P49| Indirect indexing plate with 6 circles of holes 21-33| 1
P50| Indirect indexing plate with 6 circles of holes 37-49| 2
P51|  Back nut| 2
P52|  Hex. socked cap screw| 1
P53| Blovk| 1
P54| Single coil spring lock washer| 2
P55|  Hex. head bolt| 2
P56| Dividing head base| 1
P57|  Flange plate| 1
Part No.| Description| Qty
---|---|---
TPO1| Nut| 2
TPO2| Washer| 2
TPO3| Fixed tailstock (Base)| 1
TPO4| Hex. head screw| 2
TPO5|  Center for tailstock| 1
TPO6|  Moveable block| 1
TPO7| Hex. socket cap screw| 1
TPO8|  Setscrew| 1
TPO9| Nut| 1
TP10| Stud| 1
TP11| Control nut| 1

Universal Dividing Head EXPLODED VIEW BS-2

DIVIDING TABLE (WORM RATIO 1: 40)

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