Norco FLENNOR Ball Reverser User manual

Ball Reverser
Ball Reverser®Actuator
Patented
®
FLENNOR
™PowerTransmission Products

Ball Reverser®Principle General Information
NORCO'S Ball Reverser®Actuator is a unique actuator which provides automatic reciprocating
action. The Ball Reverser has a wide range of applications throughout many industries. There are
six standard sizes: 1600, 1700, 1800, 1900, 2000, and 2100, each offering two screw
materials. The prefix BR designates alloy steel case hardened to 56-60 Rc. The prefix
BRC designates stainless steel through hardened to 40-45 Rc.
Sleeve
Snap Ring
Turnaround Cage
Retaining Springs
Slot Ball
Fixed Ball
Slot Ball
Figure 2 Figure 3
REVERSING SEQUENCE
Before During After
TURNAROUND CURVES
Standard Instant Dwell
A key element in the Ball Reverser's function is the
reversing sequence, as shown in Figure 2. The two slot
balls move relative to the fixed ball as they follow the turn-
around curve. The standard curve is designed for the
optimum deceleration and acceleration of the mass for
each size Ball Reverser according to the formulas
shown. It is designated by the suffix "-1" in the part num-
ber; i.e., BR 1818 "-1". Figure 3 shows turnaround cures
for special applications which require engineering review
in order to maintain appropriate design limits.
The load and lie selection process which follows will
determine which size BR or BRC is suitable for your
application.
Ball Reverser life is rated in L10 hours of the nut assem-
bly or screw, whichever is lower. The L10 life is defined as
the number of hours that 90 percent of the units will
exceed without failure. All life calculations are based on a
"friendly environment," i.e., proper lubrication and align-
ment, no shock loading or other abnormal conditions.
- 2 -

Calculation References Load Capacity
HORIZONTAL VERTICAL WINDING
Figure 4 Figure 5 Figure 6
Pa
Pr
GS
W
P
P = (Pr + W) µ + W a + Pa
g
PrW
GS
PaP
P = Pr µ + W + W a + Pa
g
Y
P
Tc
Guide
θ
P = Tc sin θ
X
Figure 7 Figure 8
1600
BRC
BR
1700
BRC
BR
1800
BRC
BR
1900
BRC
BR
2000
BRC
BR
2100
BRC
BR
12
18
22
30
39
98
120
282
240
593
427
1100
(53)
(80)
(98)
(134)
(173)
(434)
(534)
(1254)
(1068)
(2638)
(1899)
(4893)
47
75
81
129
106
212
283
565
509
1014
886
1765
(209)
(334)
(360)
(573)
(473)
(943)
(1263)
(2513)
(2242)
(4510)
(3939)
(7851)
33
53
56
89
72
145
197
392
356
710
609
1214
(147)
(236)
(249)
(396)
(320)
(645)
(875)
(1744)
(1583)
(3158)
(2708)
(5400)
675
800
675
800
540
800
340
600
240
500
160
300
3.9
3.9
5.8
5.8
7.6
7.6
10.2
10.2
13.9
13.9
18.0
18.0
LBS LBS LBS RPM(N) (N) (N)
Pm Cn Cs LS K
Pt (lbs) = P + KWR2
1x106
Pt (N) = P + KWR2
1x105
NL = 16666 Cn 3
R P
SL = 16666 S Cs 3
RPt
T (lb-in) = Pt x I
2.83 T (n-m) = Pt x I
2837
a= Carrier acceleration (in/sec2or m/sec2)
CN = Basic dynamic capacity (nut)
Cs = Basic dynamic capacity (screw)
GS = Guide System
g = Gravity acceleration (386 in/sec2or
9.801m/sec2)
I= Lead (inch or mm)
K= Inertia constant
LS = Limiting speed for standard selection
NL = Nut life hours
θ= Fleet angle =ARCTAN (y/x)
P= Applied Axial Load (lbs. or N)
Pa = Carrier axial load (lbs. or N)
- 3 -
Pm = Maximum Allowable Axial Load
Pr = Side loads (lbs or N)
Pt = Maximum inertial load at turnaround
R= Screw rpm
S= Stroke (page 6)
SL = Screw life hours
T = Input torque
Tc = Cable tension (lbs or N)
µ= Guide System (GS) Coefficient of friction
W= Carrier weight (lbs or Kg)
X= Distance between Ball Reverser center line
and cable guide
Y= One-Half (1/2) the cable drum width

Selection Process
- 4 -
Ball Reverser®selection has three steps, determination
of (1) Load (2) Speed and (3) Life.
The axial load (P) on a Ball Reverser is the applied force
parallel to the screw. All side loads (Pr) should be taken
by the Guide System. Each has its own coefficient of fric-
tion (µ).
In all applications, the maximum inertia load (Pt) at
the turnaround must not exceed the maximum
allowable load (Pm), Figure 7.
Step 1 Determine Load
(A) Calculate P using the formula in either
Figure 4, 5, or 6.
(B) Calculate Pt, Figure 8 and compare to Pm Figure 7.
(C) Using the higher value of P or Pt, select the BR with
a higher Pm from Figure 7.
(D) Select Stroke, page 6.
Step 2 Determine Speed
(A) Calculate RPM from linear speed and lead.
(B) Compare the calculated RPM to the Limiting Speed
(LS) and select the appropriate BR size in Figure 7.
Step 3 Determine Life
(A) Calculate nut assembly and screw in L10 life.
(B) Compare lower number vs. application
requirements.
Example:
Given: Horizontal Application (Figure 4)
Stroke = 8.9 inches Pa = 30 lbs. Pr = 0 W = 20lbs.
GS = Ball Bushings (µ = .004)
Travel Rate = 600 inches/min a = .1g.
Life Required = 4 hours/day, 5 days/week, 100 weeks.
Step 1
(A) P = (0 + 20) 0.004 + (20 x 0.1 x 386) + 30 = 32.08 lbs.
386
(B)Pt = 32.08 + 7.6 x 20 (600)2 = 86.8 lbs.
1x106
(C)Pt = 86.8 lbs. < Pm 98 of the BR1800, therefore the
BR 1800 is acceptable.
(D)For stroke of 8.88 inches, select BR1818-1, i.e.
index "18".
Step 2
(A)600 inches/min. ÷x 1.00 inch Lead = 600 RPM
(B)The BR 1800 Limiting Speed is 800 RPM, therefore
the BR1800 is acceptable in this application.
Step 3
(A)NL = 16666 212 3= 8016 hours
600 32.08
SL = 16666 x 18 145 3= 2330 hours
600 86.8
(B)Therefore the life expectancy is 2,330 hours, which is
the lower of the two values and is above the 2,000
hours required.
Summary:
BR1800 meets Load, Speed and Life minimum. Stroke
index "18" is acceptable, 8.88 vs. 8.90 inches, therefore
the most suitable part number is BR1818-1 (MBR 1818-1
for metric mounting holes).
Other Considerations:
For certain applications, it is helpful to know the torque
required to drive the Load. In the above example the
torque required would be:
T = 86.8 x 1 = 30.67 lb-in.
2.83
Winding:
These applications have the maximum axial load for the
Ball Reverser occurring at the ends of the cable drum.
This is calculated as a function of the fleet angle (θ) and
cable tension (Tc) shown in Figure 6.
Example:
Given:
Drum Width: = 66 inches
Cable Tension: = 10,000 pounds
Cable Diameter: = .5 inch
X= 377 inches (Distance between Ball Reverser
center line and cable guide)
Y= 33 inches (1/2 the cable drum width)
Calculate:
Fleet Angle (θ) = ARCTAN y = 33 = .0875 = 5°
x 377
P = Tc (SIN θ) P = 10,000 (0.0872) P = 872 lbs.
When P has been calculated follow the normal steps for
selecting the appropriate size of Ball Reverser®. Figure
7 indicates that a BR2100 series is required because of
its rated capacity of 1,100 lbs. To determine the proper
stroke, subtract the cable diameter from the drum width.
If this stroke cannot be found, consult our Engineering
department. In this example, the appropriate “index” is
“44” with a stroke of 65.5 inches, (66 inches minus .5 =
65.5 inches). The correct part number is BR2144-1.
ASK ABOUT OUR OTHER LINEAR MOTION PRODUCTS.
◆Diamond Reverser ◆Rollnut™Oscillators
◆Rollnuts™◆Timing Belt Drives

19.05
25.40
108.71
103.13
50.00
41.00
30.98
33.27
268.20
M 6 M 8 M 12 M 12
Basic Specifications
- 5 -
SERIES 1600 1700 1800 1900 2000 2100
in. in. in. in. in. in.mm mm mm mm mm mm
θ
I
B
J
D
E
H
F
Z
G
G1
.37
.50
1.55
1.50
1.10
.98
.64
.78
4.38
6-32
9.53
12.70
39.35
38.10
28.00
25.00
16.25
19.80
111.30
M 3
.50
.75
2.06
2.00
1.46
1.22
.87
.94
5.87
10-32
.75
1.00
4.28
4.06
1.97
1.61
1.22
1.31
10.56
1/4-20
1.25
1.25
6.20
6.00
2.95
2.37
1.86
1.94
16.13
1.75
2.00
8.05
7.00
3.94
3.25
2.45
2.69
21.00
2.50
3.00
8.20
8.00
5.31
4.47
3.23
3.75
22.87
12.70
19.05
52.45
50.80
37.00
31.00
22.10
23.88
149.10
M 4
31.75
31.75
157.61
152.40
75.00
60.20
47.24
49.28
409.70
44.45
50.80
204.47
177.80
100.00
82.55
62.23
68.33
533.40
63.50
76.20
208.41
203.20
135.00
113.50
82.94
95.25
580.90
DESCRIPTION 1600 1700 1800 1900 2000 2100
ASSEMBLY
with alloy screw
with stainless screw
CAGE inch
mm
SLEEVE
PARTS KIT
BR 16XX-1
BRC 16XX-1
CA16
MCA16
SL16
KT16
BR 17XX-1
BRC 17XX-1
CA17
MCA17
SL17
KT17
BR 18XX-1
BRC 18XX-1
CA18
MCA18
SL18
KT18
MBR 19XX-1
MBRC 19XX-1
MCA19
SL19
KT19
MBR 20XX-1
MBRC 20XX-1
MCA20
SL20
KT20
MBR 21XX-1
MBRC 21XX-1
MCA21
SL21
KT21
Ball Reversers®last longer with proper maintenance.
Lubrication and appropriate use of component parts will
increase its functional life. Norco recommends a light film
of FNI-L4 lubricant (available from Norco) be applied to
increase the life of the product. The replacement of the
Parts Kit (3 balls and 2 retaining springs) and Sleeve at
appropriate intervals protect and extend the functional life
of the Screw and Nut assembly. The Cage and Sleeve are
a through hardened (Rc 55-60) bearing material. They are
plated for a corrosion resistant finish.
S= Stroke (see page 6) Z= Total length factor L= Total length (S + Z)
H= Nut over travel J= Annealed length for alloy screw XX = Stroke “Index” (See page 6)
Note: The performance values do not constitute a warranty either in fact or implied. Specifications in this catalog are only a reference. NORCO reserves the right
to change without prior notice.

Strokes in Inches Sizes
INDEXES
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
1600
0.44
0.69
0.94
1.19
1.44
1.69
1.94
2.19
2.44
2.69
2.94
3.19
3.44
3.69
3.94
4.19
4.44
4.69
4.94
5.19
5.44
5.69
5.94
6.19
6.44
6.69
6.94
7.19
7.44
7.69
7.94
8.19
8.44
8.69
8.94
9.19
9.44
9.69
9.94
10.19
10.44
10.69
10.94
11.19
11.44
11.69
11.94
12.19
12.44
1700
0.65
1.03
1.40
1.78
2.15
2.53
2.90
3.28
3.65
4.03
4.40
4.78
5.15
5.53
5.90
6.28
6.65
7.03
7.40
7.78
8.15
8.53
8.90
9.28
9.65
10.03
10.40
10.78
11.15
11.53
11.90
12.28
12.65
13.03
13.40
13.78
14.15
14.53
14.90
15.28
15.65
16.03
16.40
16.78
17.15
17.53
17.90
18.28
18.65
1800
0.88
1.38
1.88
2.38
2.88
3.38
3.88
4.38
4.88
5.38
5.88
6.38
6.88
7.38
7.88
8.38
8.88
9.38
9.88
10.38
10.88
11.38
11.88
12.38
12.88
13.38
13.88
14.38
14.88
15.38
15.88
16.38
16.88
17.38
17.88
18.38
18.88
19.38
19.88
20.38
20.88
21.38
21.88
22.38
22.88
23.38
23.88
24.38
24.88
1900
1.12
1.75
2.37
3.00
3.62
4.25
4.87
5.50
6.12
6.75
7.37
8.00
8.62
9.25
9.87
10.50
11.12
11.75
12.37
13.00
13.62
14.25
14.87
15.50
16.12
16.75
17.37
18.00
18.62
19.25
19.87
20.50
21.12
21.75
22.37
23.00
23.62
24.25
24.87
25.50
26.12
26.75
27.37
28.00
28.62
29.25
29.87
30.50
31.12
2000
1.75
2.75
3.75
4.75
5.75
6.75
7.75
8.75
9.75
10.75
11.75
12.75
13.75
14.75
15.75
16.75
17.75
18.75
19.75
20.75
21.75
22.75
23.75
24.75
25.75
26.75
27.75
28.75
29.75
30.75
31.75
32.75
33.75
34.75
35.75
36.75
37.75
38.75
39.75
40.75
41.75
42.75
43.75
44.75
45.75
46.75
47.75
48.75
49.75
1600
12.69
12.94
13.19
13.44
13.69
13.94
14.19
14.44
14.69
14.94
15.19
15.44
15.69
15.94
16.19
16.44
16.69
16.94
17.19
17.44
17.69
17.94
18.19
18.44
18.69
18.94
19.19
19.44
19.69
19.94
20.19
20.44
20.69
20.94
21.19
21.44
21.69
21.94
22.19
22.44
22.69
22.94
23.19
23.44
23.69
23.94
24.19
24.44
24.69
1700
19.03
19.40
19.78
20.15
20.53
20.90
21.28
21.65
22.03
22.40
22.78
23.15
23.53
23.90
24.28
24.65
25.03
25.40
25.78
26.15
26.53
26.90
27.28
27.65
28.03
28.40
28.78
29.15
29.53
29.90
30.28
30.65
31.03
31.40
31.78
32.15
32.53
32.90
33.28
33.65
34.03
34.40
34.78
35.15
35.53
35.90
36.28
36.65
37.03
1800
25.38
25.88
26.38
26.88
27.38
27.88
28.38
28.88
29.38
29.88
30.38
30.88
31.38
31.88
32.38
32.88
33.38
33.88
34.38
34.88
35.38
35.88
36.38
36.88
37.38
37.88
38.38
38.88
39.38
39.88
40.38
40.88
41.38
41.88
42.38
42.88
43.38
43.88
44.38
44.88
45.38
45.88
46.38
46.88
47.38
47.88
48.38
48.88
49.38
1900
31.75
32.37
33.00
33.62
34.25
34.87
35.50
36.12
36.75
37.37
38.00
38.62
39.25
39.87
40.50
41.12
41.75
42.37
43.00
43.62
44.25
44.87
45.50
46.12
46.75
47.37
48.00
48.62
49.25
49.87
50.50
51.12
51.75
52.37
53.00
53.62
54.25
54.87
55.50
56.12
56.75
57.37
58.00
58.62
59.25
59.87
60.50
61.12
61.75
2000
50.75
51.75
52.75
53.75
54.75
55.75
56.75
57.75
58.75
59.75
60.75
61.75
62.75
63.75
64.75
65.75
66.75
67.75
68.75
69.75
70.75
71.75
72.75
73.75
74.75
75.75
76.75
77.75
78.75
79.75
80.75
81.75
82.75
83.75
84.75
85.75
86.75
87.75
88.75
89.75
90.75
91.75
92.75
93.75
94.75
95.75
96.75
97.75
98.75
2100
76.00
77.50
79.00
80.50
82.00
83.50
85.00
86.50
88.00
89.50
91.00
92.50
94.00
95.50
97.00
98.50
100.00
101.50
103.00
104.50
106.00
107.50
109.00
110.50
112.00
113.50
115.00
116.50
118.00
119.50
121.00
122.50
124.00
125.50
127.00
128.50
130.00
131.50
133.00
134.50
136.00
137.50
139.00
140.50
142.00
143.50
145.00
146.50
148.00
Length is designated by the index number as the last two digits in the part number description, i.e. BR 1818 is an alloy
screw, size 1800, with a stroke of 8.88 inches.
Copyright 2000, Norco, Inc. All rights reserved. Printed in U.S.A.
2100
2.50
4.00
5.50
7.00
8.50
10.00
11.50
13.00
14.50
16.00
17.50
19.00
20.50
22.00
23.50
25.00
26.50
28.00
29.50
31.00
32.50
34.00
35.50
37.00
38.50
40.00
41.50
43.00
44.50
46.00
47.50
49.00
50.50
52.00
53.50
55.00
56.50
58.00
59.50
61.00
62.50
64.00
65.50
67.00
68.50
70.00
71.50
73.00
74.50
INDEXES
02
03
04
05
06
07
08
09
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
FLENNOR
™PowerTransmission Products