Gearbox BL250D User manual

OPERATION MANUAL
BENCH LATHE MODEL: BL250D

GENERAL SAFETY INSTRUCTIONS
EXTREME CAUTION SHOULD BE USED IN OPEATION ALL POWER
TOOLS. KNOW YOUR POWER TOOL, BE FAMILIAR WITH ITS
OPEARTION.READ THE OWNER’S MANUAL AND PRACTICE SAFE
USAGE PROCEDURES AT ALL TIMES.
zCONNECT your machine ONLY to the matched and specified power
source.
zWEAR SAFETY G LASSES, RESPIRATORS, HEARING PROTECTION
and SAFFTY SHOES when operating heavy machinery. Always wear
safety glasses.
zDO NOT wear loose clothing or jewelery when operating machinery.
zA Safe Environment is important. Keep the area free of dust, dirt and other
debris in the immediate vicinity of the machine.
zBE ALERT! Do Not Use prescription or other drugs that may affect your
ability or judgement to safely use this machine.
zDISCONNECT the power source when changing tool bits and or any
equipment.
zNEVER leave an operating tool unattended.
zALWAYS keep blades, knives or bits sharp and properly aligned.
zALWAYS keep all safety guards in place and ensure their proper function.
zALWAYS make sure that any tools used for adjustments are removed
before operating the machine.
zALWAYS secure your work with the appropriate clamps or vises.
zALWAYS keep bystanders safely away while operating machinery.
zDO NOT change speed while spindle is running.
zTHINK SAFELY.WORK SAFELY. Never attempt a procedure if it dose not
feel safe or comfortable.

I N D E X
1、STRUCTURE, FEATURES AND USAGE
2、MAIN SPEIFICATIONS
3、TRANSMISSION SYSTEM
4、INSTALLATION AND TRIAL RUNNING
5、OPERATION AND MAINTENANCE
6、LUBRICATION
7、ELECTRICALDIAGRAM
8、SPAREAPRTS

1、STRUCTURE, FEATURES AND USAGE
This lathe adopts full gear transmission with great stability and high tooling
accuracy. The main spindle speed changing unit –diprosopia curves disc, and
longitudinal/cross feeding safety unit are own patented. The full functioned
lathe with longitudinal/cross auto-feeding can realize tooling speeds choosing
and regular threads setting through feeding box.
1
2
C
B
A
1
2
3
4
5
A B C A B C A B C
5
4
3
2
1
5
4
3
2
1
5
4
3
2
1
0.50 1.00 2.50
0.40
0.35
0.30
0.25
0.80
0.70
0.60
0.50
2.00
1.75
1.50
1.25
48 24
60 30 12
80 40 16
96 48
mm n/1″
mm
CJM250
0.035 0. 070.175
0.045 0. 090.225
0.050. 100.25
0.060. 120.30
0.075 0. 150.375
O
F R
Picture 1 OVERVIEW
) Headstock Full gear driven, the spindle speed changing is achieved
through sliding gears and the main spindle can get 12 kinds of speeds
at wide range.The lathe has the structure of forward/reward feeding
unit which can get auto feeding in both direction and make right/left
threading.
) Gearbox Transmit the movement in headstock to feeding box through
change gears. By choosing different change gears, different
metric/imperial threading can be achieved.
) Feeding box It has 15 shifts. There is no need of changing the gears
to get 15 kinds of feeding speed and tooling 15 kinds of
metric/imperial threads.
)Carriage It has longitudinal/cross feeding interlock unit which
can make auto feeding in longitudinal or cross direction.
) Bedway The bedway adopts two V guideways, ensuring perfect
positioning accuracy and excellent tooling rigidity.
)Tailstock
It adopts rapid cam-lock unit to make easy and rapid operation.
) Standard accessories
Three jaw chuck, dead center, toolpost wrench, inner hexagon spanner,
stud dead spanner, change gears, splash guard
) Optional accessories for your choice
Machine stand, steady rest, follow rest, oil tray, toolcutter set,
live center, face plate, four jaw chuck, backplate, special gears.

2、MAIN SPEIFICATIONS
3、TRANSMISSION
) Headstock spindle speed change：
The motor power is transferred to Headstock axle I through V-belts and then to
headstock main spindle through sliding gears on axle I and axle V, so the main
spindle gets 12 kinds of different speeds.
) Feeding speed change and thread tooling：
The main spindle works on the gears on axle III and IV through feeding gears, the
different meshing of sliding gears on axle III achieves forward and reverse
rotation.。Through a set of final reduction gear and change gears A, B, C to drive
the input axle in feeding box, then through complex gears on second motion shaft,
to make the output axle achieve two different rotation directions and 15 different
Main parameters BL250G
Max. swing over bed 250 ㎜9.8″
Max. work-piece length 500 ㎜19.6″
Max. swing over carriage 150 ㎜6″
Main spindle diameter 26 ㎜1.02″
Main spindle taper No.4
Main spindle speed 12 96—1920r/r.p.
m
Max. travel cross of toolpost 125 ㎜5.1″
Max. travel longitudinal of toolpost 75 ㎜3″
Thread in metric 15 9
Range of thread in metric 0.25－2.5
㎜12－96 1/n″
Toolpost longitudinal feeding per spindle rotation 0.03－
0.275mm/r
0.00118—0.0106
″/r
Toolpost cross feeding per spindle rotation
0.015－
0.137mm/r
0.0059—0.0053″/
r
Max. travel of tailstock sleeve 60mm 2.36″
Tailstock sleeve taper No.3
Main motor 750W/220V/50HZ
Gross/net weights 180/163 ㎏
Overall dimensions 1130×55
0×405
44.5″×21.7″×
16″
Packing dimensions 1200×62
0×600
47.3″×24.4″×
23.7″

speeds reach the carriage through longitudinal feeding screw. By pressing the
halfnut handle, the toolpost shall make the thread tooling; release it, the toolpost
shall make longitudinal or cross movement.
4、ASSEMBLYINGAND TRIAL
) Open the case, check the content against the packing list.
) Put the lathe on the machine stand, fasten it after adjusting the
guideway to level.
) Clean the guideway, work table, carriage and oily surface by clear
etamine or non-corrosive kerosene; Inject #10 or #7 machine
lubrication oil into the parts as per lathe lubrication requirements
and check the oil level.
) Check the longitudinal and cross movement of toolpost.
) Check the motor and electrical parts and make sure of reliable
earthing.
) For trial, run the lathe at low speed in twenty minutes. During normal
running, increase the speed step by step as per the speed indication
shown on the speed plate. The speed change should be effected only
when the main spindle fully stops. Slightly rotate the main spindle
when tripping the speed change handle to help the gears smoothly
changing.
)The operator shall read carefully the manual, pay attention to the
lubrication and maintenance of the lathe to prolong the working life.

650
950
200 150
140
Pic. 3、Assembly positions of the lathe
5、OPERATIO AND MAINTENANCE
1
2
C B A 1
2 3
4 5
A B C A B C A B C
5
4
3
2
1
5
4
3
2
1
5
4
3
2
1
0.50 1.002.50
0.40
0.35
0.30
0.25
0.80
0.70
0.60
0.50
2.00
1.75
1.50
1.25
48 24
60 30 12
80 40 16
96 48
mm n/1″
mm
CJM250
0.0350.07 0.175
0.0450.09 0.225
0.05 0.10 0.25
0.06 0.12 0.30
0.0750.15 0.375
O
F R
1 2 3 4 5 6 7 8 9 10 11 12 13
Pic 4、Operation system
zOperation：
) Headstock：
Trip handle 2，making the arrow aiming at the tablet, shows the chosen speed.
Handle 3 is forward/reverse feeding handle, the toolpost shall move as per
showing.
)Feeding box：
Change the position of handles 1 and 4 to get necessary threads as per the
indication shown on the Feeding & Threading Tablet.

A B C A B C A B C
5
4
3
2
1
5
4
3
2
1
5
4
3
2
1
0.50 1.00 2.50
0.40
0.35
0.30
0.25
0.80
0.70
0.60
0.50
2.00
1.75
1.50
1.25
48 24
60 30 12
80 40 16
96 48
mm n/ 1 ″
mm
0.035 0.07 0.175
0.045 0.09 0.225
0.05 0.10 0.25
0.06 0.12 0.30
0.075 0.15 0.375
Pic 5、Feeding & Threading Tablet
When change metric threading to imperial threading, besides the
indications shown on the tablet, you are required to change Gear A
from teeth 34(teeth 36) to teeth 36 (teeth 34).
) Carriage：
Handle 8 is for longitudinal and cross feeding. Press down for cross feeding and
up for longitudinal, the middle is neutral position. When handle 8 at neutral
position, rotate handwheel 5 and 6 can also achieve longitudinal/cross movement
of toolpost. Press down handle 9, close the halfnut, the toolpost shall make
threading. Handle 8 and 9 can be inter-locked.
) Saddle and toolpost：
Handle 7 is for locking the toolpot, handle 10 is for moving the small carriage
and handle 6 for moving working table.
) Tailstock：
Handle 11 is for locking the sleeve in tailstock. Releasing handle 11, rotate
handle 13, you can get out sleeve; handle 12 is for locking the tailstock.
zMaintenance：
) Making lubrication as per request before operation.
) Clean the chips on bedway, saddle, toolpost to avoid strain.
) The operator shall strictly make the operation as per regulations to
avoid damage of the lathe and human safety.
)Never stop/brake the lathe by hands.
) No setting of tools and other objects on the headstock, toolpost and
guidewawy.

6、LUBRICATION
Serial Parts Lub. parts Means Oil type Lub. Period
1 Change gear box Change gears, oil
windows Oil gun Once per shift
2 Headstock splash 60 days
3 Feeding box Gears, bearings Oil rope
4 toolpost
5 Worktable
6 bedway
7 Tailstock
Leadscrew, guideway Oil gun
Machine
oil
Once per shift
)Before and after operation, all the lubrication points and surface
should be oiled.
1
2
C
B
A 1
2
3
4 5
ABC ABC ABC
5
4
3
2
1
5
4
3
2
1
5
4
3
2
1
0.50 1.00 2.50
0.40
0.35
0.30
0.25
0.80
0.70
0.60
0.50
2.00
1.75
1.50
1.25
48 24
60 30 12
80 40 16
96 48
mm n/1″
mm
CJM250
0.035 0.070.175
0.045 0.090.225
0.050.100.25
0.060.120.30
0.075 0.150.375
O
F R
1 2 3 4 75 6
Pic 6、Lubrication
7、Electrical chart
U
PE
K1 K2
PE
PE
7
U2
23 24
13 14
A1
86 5
4 2 1 3
U1
V1
12 10 911
V2
plug
machine body switch
L
N
motor
magnetic switch

8、ACCESSOIES
NO Name Specifications Quantity
1 3 jaw chuck φ125 1
2 Dead centers MT3#，MT4#1 each
3 Toolpost wrench 1
4 Allen wrench 4、5、6 1 each
5 Stud dead spanner 12-14，17-19 1 each
6 Change gears 4 kinds 1 each （3 pcs already mounted）
7 Splash guard 1

床身部装 BED ASSEMBLY
序号 代号名称规格数量 备注
1 GB5781-86 六角螺栓 M8×25 4
2 GB1171-74 三角胶带 O
# 630 2
3 CJM250-08-003 电机带轮 1
4 GB78-85 螺钉 M6×10 1
5 GB1096-79 平键 4×24 1
6 CO27124 电机 750W/220V 1
7 GB70-85 螺钉 M6×20 2
8 CJM250-08-004 调节架 1
9 GB97.2-85 垫圈 12 2
10 CJM250-08-010 电机底板 1
11 GB/T91-2000 开口销 3.2×20 2
12 CJM250-08-012 支承轴 1
13 GB70-85 螺钉 M6×20 2
14 CJM250-08-011 支座 1
15 GB93-87 弹簧垫圈 8 3
16 GB5781-86 六角螺栓 M8×30 3
17 GB5781-86 六角螺栓 M8×30 1
18 GB96-85 大垫圈 8 1
19 CJM250-01-001 床身 1
20 GB95-2002 垫圈 12 1
21 GB5781-86 六角螺栓 M12×35 2 ※
22 GB117-85 圆锥销 4×24 4
23 GB70-85 螺钉 M5×16 6
24 CJM250-01-003 齿条 2
25 GB831-1988 开槽无头轴位螺钉 M8×16 1
26 GB/T7940.4-1995 压配式压注油杯 8 1
27 CJM250-01-005 纵向丝杆座 1
28 GB117-85 圆锥销 3×22 2
29 GB70-85 螺钉 M5×16 2
30 CJM250-01-004 挡屑板 1
31 GB818-85 螺钉 M5×8 3
32 CJM250-01-002 纵向丝杆 1

6
78
910
13 14 16
15
17 18
19
20 21 22 24
23
11 12
21
5
34
Bed Assembly
床身部装
26
27
28
29
30
31
32
25

床头箱部装 HEADSTOCK ASSEMBLY
序号 代号名称规格数量 备注
1 CJM250-02-022 堵 1
2 GB276-89 轴承 102 1
3 CJM250-02-028 三联齿轮 1
4 CJM250-02-034 双联齿轮 1
5 GB70-85 螺钉 M6×16 4
6 CJM250-02-048 车头箱盖 1
7 CJM250-02-048 油塞 1
8 CJM250-02-035 花键轴 1
9 GB276-89 轴承 102 1
10 CJM250-02-022 堵 1
11 CJM250-02-022 堵 1
12 GB276-89 轴承 102 1
13 CJM250-02-023 垫圈 1
14 CJM250-02-024 齿轮 1
15 CJM250-02-026 隔套 1
16 CJM250-02-027 齿轮 1
17 CJM250-02-026 隔套 1
18 CJM250-02-030 齿轮 1
19 CJM250-02-031 齿轮 1
20 CJM250-02-032 轴 1
21 GB1096-79 平键 6×75 1
22 GB1096-79 平键 5×10 1
23 CJM250-02-033 齿轮 1
24 GB276-89 轴承 102 1
25 CJM250-02-022 堵 1
26 GB5781-2000 螺栓 M8×25 3
27 CJM250-02-043 左拨叉 1
28 CJM250-02-047 右拨叉 1
29 CJM250-02-051 拨叉轴 1
30 CJM250-02-050 密封垫 1
31 GB78-85 螺钉 M6×12 1
32 CJM250-02-001 车头箱体 1
33 GB872-88 圆螺母 M35×1.5 1
34 GB858-88 挡圈 35 1
35 GB70-85 螺钉 M6×12 3
序号 代号名称规格数量 备注

36 CJM250-02-017 后封油盖 1
37 CJM250-02-016 挡油环 1
38 GB297-84 轴承 7207 1
39 GB894.1-86 轴用弹性挡圈 35 1
40 CJM250-02-018 双联齿轮 1
41 GB894.1-86 轴用弹性挡圈 38 1
42 CJM250-02-036 双联齿轮 1
43 GB297-84 轴承 7208 1
44 CJM250-02-037 封油盖 1
45 GB70-85 螺钉 M6×12 3
46 CJM250-02-015 主轴 1
47 GB1096-79 平键 10×30 1
48 GB1566-79 平键 10×40 1
49 GB872-88 圆螺母 M20×1.5 1
50 GB858-88 挡圈 20 1
51 CJM250-02-019 输入带轮 1
52 GB70-85 螺钉 M6×12 3
53 CJM250-02-021 轴承座 1
54 HG4-692-67 油封 PC25×42×10 1
55 CJM250-02-020 隔圈 1
56 GB276-89 轴承 104 1
57 GB893-86 孔用弹性挡圈 42 1
58 GB276-89 轴承 104 1
59 GB1160-79 圆型油标 16R51-5A 1
60 CJM250-02-042 滑块 1
61 GB882-86 销 5×14 1
62 CJM250-02-041 滑套 1
63 CJM250-02-046 上拨叉板 1
64 GB119-86 销 10×26 1
65 GB1096-79 平键 6×18 1
66 CJM250-02-025 输入轴 1
67 CJM250-02-029 双联齿轮 1
68 GB276-89 轴承 102 1
69 CJM250-02-022 堵 1
70 CJM250-02-002 拨叉支承轴 1
71 CJM250-02-045 下拨叉 1
72 GB894.1-86 轴用弹性挡圈 15 1
序号 代号名称规格数量 备注
73 GB119-86 销 10×26 1

74 CJM250-02-044 下拨叉板 1
75 CJM250-02-041 滑套 1
76 GB882-86 销 5×14 1
77 CJM250-02-042 滑块 1
78 CJM250-02-058 拨叉臂 1
79 GB879-86 弹性圆柱销 3×22 1
80 JB892-77 组合垫圈 10 1
81 GB5783-2000 螺栓 M10×10 1
82 CJM250-02-059 拨块 1
83 CJM250-02-042 滑块 1
84 CJM250-02-057 拨叉轴 1
85 GB70-85 螺钉 M5×8 2
86 CJM250-02-040 拨叉杆 1
87 CJM250-02-041 滑套 1
88 CJM250-02-052 端面曲线槽盘 1
89 GB882-86 销 5×14 1
90 CJM250-02-039 嵌套 1
91 GB1096-79 平键 6×18 1
92 CJM250-02-053 轴套 1
93 GB819-85 螺钉 M4×10 3
94 GB93-85 弹性垫圈 3 1
95 CJM250-02-054 手柄支座 1
96 CJM250-02-038 螺轴 1
97 GB819-85 螺钉 M5×12 3
98 CJM250-03-004 手柄杆 1
99 CJM250-02-055 速度盘 1
100 GB308-77 钢球 6 1
101 GB2089-80 压缩弹簧 0.8×6×15 1
102 GB73-85 螺钉 M8×10 1
103 GB77-85 螺钉 M6×10 2
104 CJM250-02-056 圆手柄 1
105 GB894.1-86 轴用弹性挡圈 24 1
106 CJM250-02-009 轴 1
107 CJM250-02-004 齿轮 1
108 CJM250-02-005 套 1
109 GB894.1-86 轴用弹性挡圈 18 1
序号 代号名称规格数量 备注
110 GB896-86 开口垫圈 9 1
111 CJM250-02-014 齿轮 1

112 GB70-85 螺钉 M6×12 2
113 CJM250-02-011 轴套 1
114 HG4-692-67 油封 PC15×24×7 1
115 CJM250-02-012 套 1
116 GB1096-79 平键 4×10 1
117 CJM250-02-013 花键轴 1
118 CJM250-02-010 滑移齿轮 1
119 GB2089-80 压缩弹簧 0.8×5×15 1
120 GB308-77 钢球 5 1
121 CJM250-02-003 衬套 1
122 GB1155-79 油杯 6 1
123 GB896-86 开口垫圈 9 1
124 GB97-85 垫圈 12 1
125 CJM250-08-009 交换齿轮 1
126 CJM250-02-007 齿轮 1
127 CJM250-02-008 键套 1
128 GB1096-79 平键 6×18 1
129 CJM250-02-006 小轴 1

26
22
21
83
82
79
84
85
76 75
60
80
112
81
78
59
77
119
120
10 9
32
31
30
86
87
89
90
93
94
96
88
91
92
95
97
62
61
74
73
49 50 51 52 53 54 55 56 57 58
108
10 7
27 28 29
11 13
12 14 15 16 17 18 19
124
357
6
8910
20
23 24 25
41 42 43 44 45 46 47 48
68 69
67
66
65
63
64
33 34 35 36 37 38 39 40
114
11 6 117 118 121
115
113
111
110
123 12 5 12 7
126
124
122
128 12 9
99
10 5
10 0
104
103
10 1
102
98
床头箱部装
Headstock Assembly
106
130
70
72 71 13 1

尾座部装 TAILSTOCK ASSEMBLY
序号 代号名称规格数量 备注
1 CJM250-03-004 手柄 1
2 CJM250-03-003 锁紧手柄 1
3 CJM250-03-012 垫圈 1
4 CJM250-03-013 锁紧套 1
5 CJM250-03-014 锁紧螺母 1
6 GB/T7940.4-1995 压配式压注油杯 6 1
7 GB/T879-2000 弹性圆柱销 3×22 1
8 GB/T77-2000 螺钉 M10×35 1
9 CJM250-03-002 尾座体 1
10 J31-3A T型键 B5×12 1
11 GB73-85 螺钉 M4×12 2
12 CJM250-03-006 螺母 1
13 CJM250-03-001 尾座套筒 1
14 CJM250-03-011 长手柄 1
15 CJM250-03-016 偏心轴 1
16 GB/T879-2000 弹性圆柱销 3×22 1
17 GB/T79-2000 螺钉 M5×8 2
18 GB/T77-2000 螺钉 M10×35 1
19 GB/T78-2000 螺钉 M10×16 1
20 CJM250-03-005 螺杆 1
21 GB1096-79 平键 4×20 1
22 CJM250-03-007 固定座 1
23 GB/T7940.4-1995 压配式压注油杯 6 1
24 GB70-85 螺钉 M5×16 4
25 CJM250-04-012a 刻度盘 1
26 CJM250-03-008 手轮 1
27 GB/T96.1-2002 大垫圈 10 1
28 GB/T41-2000 六角螺母－C级M10 1
29 CJM250-03-010 手柄套 1
30 CJM250-03-009 手柄杆 1
31 GB/T2089-1994 压缩弹簧 0.5×3×12 1
32 GB308-77 钢球 4 1
33 CJM250-03-020 定位块 1
34 GB70-85 螺钉 M5×10 1
35 CJM250-03-015 定位轴 1
序号 代号名称规格数量 备注

36 CJM250-03-020 定位块 1
37 GB70-85 螺钉 M5×10 1
38 GB/T894.1-1986 轴用弹性挡圈 15 1
39 CJM250-03-017 拉杆 1
40 CJM250-03-018 尾座底板 1
41 CJM250-03-019 压板 1
42 GB/T41-2000 六角螺母－C级M10 2

21
5
4
3
87
9
10
11
12
13
14
15
16 17 18 19
22
20 21 23 24 25 26 27 28
31
32
30 29
33
36
34
35
37
38
39
41
40
42
6
尾座部装
Tailstock Assembly