Home » Product Catalogue » GEARBOXES » WORM WHEEL SPEED REDUCTION BOXES » TECHNICAL INFORMATION

TECHNICAL INFORMATION

Selection

Care should be taken when selecting a Worm wheel reduction gearbox for a new application. There are many factors that can affect the service life of the unit. The correct selection must be made to ensure the efficiency of the reducer.

Some of these factors including service, load, torque etc. are shown in the following information.

Note: THESE RATINGS ARE ONLY A GUIDE. Ratings shown are compiled using standard engineering procedures. Aline Trading P/L does not guarantee ratings in specific applications. Prototype testing of every application is recommended before production.

Size

Worm wheel reduction gearboxes are made in many styles and sizes. The size of the gearbox is referred to as the “Frame Size”. The frame size is the distance measured between the centre lines of the input and output shafts in mm. This size increases with the capacity of the gearbox and is often shown on the side of the main housing as a number in raised lettering. E.G., 60.

The standard frame sizes offered in our range of single start boxes are:

40 – 50 – 60 – 70 – 80 – 100 – 120 – 135 – 155 – 175 – 200 – 250

Gear Ratio

Once the frame size has been established you must then select the gear ratio. Gear ratios offered in our range of single reduction boxes are:

5:1 – 10:1 – 15:1 – 20:1 – 25:1 – 30:1 – 40:1 – 50:1 – 60:1

These ratios are available in all frame sizes.

Larger ratios are available in the more advanced models.

Input Shaft Speed

General input shaft speed is 600-1500 RPM. The maximum is 1800 RPM.

The minimum speed of 300 RPM is shown on most charts does not illustrate the lowest recommended input speed. The unit will run efficiently at speeds down to and below 100 rpm with greatly reduced horsepower capacity. Low speeds may also affect the efficiency of lubrication.

Worm boxes are generally driven by a drive motor but can also be used with a hand drive device when required.

Output Shaft Speed

Depends on the input shaft speed and the reduction ratio.

Torque

The transmission torque of the reducer depends upon the force that causes the output shaft to rotate and the rotary radius. See diagram below.

Note: Maximum momentary (starting) torque is limited to 25% of rated capacity.

Efficiency

Efficiency calculations may be made by dividing HP OUTPUT by HP INPUT.

When only the output torque and input horsepower is known, the output torque may be converted to HP by the following:

HP Output = Output Torque x RPM Output divided by 63,025

Thermal Capacity

The thermal capacity of the Aline unit = the maximum capacity that it can operate at a temp not exceeding 80 deg C. Operation over this temp will require additional cooling provisions.

A run in period of approx. 50 hours is normally required for worm type reducers.

Lubrication

The reducer should be filled with the appropriate oil to the centre of the oil gauge before putting into service.

Excessive oil levels result in higher operating temperatures and are as undesirable as using too little oil.

After approximately 85 hours of operation the reducer must be drained, flushed thoroughly with light oil and refilled with fresh recommended oil.

This flushing and refilling should be repeated every 2500 hours.

We use and recommend SAE 320 oil for most normal applications.

Overhung Load

Shaft or housing damage can be caused by excessive overhung load on the output shaft. The O.H.L should be included in calculations for new applications.

OVERHUNG LOAD FACTOR
Type of Drive	O.H.L factor
Sprocket	1.00
Gear	1.25
V-Belt	1.50
Flat Belt	2.50

LOAD CLASSIFICATIONS
Uniform Load	Free From Shock
Conveyors	Uniform Loads
Pumps	Centrifugal, Rotary
Compressors	Vane Type
Mixers	Constant Density

Moderate Shock
Conveyors	Not Uniform feed
Pumps	Reciprocating
Mixers	Variable Density

Heavy Shock Load	Constant Shock
Conveyors	Not uniform feed
Hammer Mills
Crushers

SERVICE FACTORS
Prime Mover	Duration of Service Per Day. (1)	Driven Machine Load Classification
Prime Mover	Duration of Service Per Day. (1)	Uniform	Medium Shock	Heavy Shock
Electric Motor	Intermittent 2 hrs	0.9	1.00	1.25
	Occasional 1/2 hr	0.8	0.9	1.00
	10 hrs	1.00	1.25	1.50
	24 hrs	1.25	1.50	1.75
Electric Motor With Frequent Starts & Stops	Intermittent 2 hrs	1.00	1.25	1.50
	Occasional 1/2 hr	0.9	1.00	1.25
	10 hrs	1.25	1.50	1.75
	24 hrs	1.50	1.75	2.00
Multi Cylinder Combustion Engine.	Intermittent 2 hrs	1.00	1.25	1.50
	Occasional 1/2 hr	0.90	1.00	1.25
	10 hrs	1.25	1.50	1.75
	24 hrs	1.50	1.75	2.00
Single Cylinder Combustion Engine	Intermittent 2 hrs	1.25	1.15	1.75
	Occasional 1/2 hr	1.00	1.25	1.50
	10 hr	1.50	1.75	2.00
	24 hrs	1.75	2.00	2.25
Note: Intermittent & occasional service refers to TOTAL operating period per day. “Frequent Start & Stops” refers to more than 10 starts per hr.

When ordering a Worm Wheel Reduction Gearbox, please specify the following:

1. Worm frame size.

2. Gear ratio.

3. Input motor information. Power, speed (RPM), type. If flange mount electric motors please specify the mount details/dimensions required.

4. Mounting arrangement required.

5. Output shaft arrangement.

Horsepower and Torque Rating Tables

These figures are indicative for standard worm drive boxes like FCA or FCWA models and reflect conditions under perfect drive. Refer to the factor chart for various applications.

Based on a Duty Cycle of 8-10 hours per day continuous.

Torque is in kg-Metres

OHL is Overhung Load in Kgs.

SIZE	RATIO	10:1
SIZE	INPUT RPM	1800	1500	1200	900	600	300
50	INPUT HP	1.23	1.16	1.01	.86	.58	.31
	OUTPUT HP	.99	.93	.84	.67	045	.23
	OUTPUT TORQUE kg-m	3.95	4.47	4.80	5.33	5.43	5.43
	OUTPUT OHL kg	90	100	110	120	140	200
60	INPUT HP	2.52	2.01	1.76	1.52	1.19	.64
	OUTPUT HP	1.78	1.63	1.41	1.20	.92	.48
	OUTPUT TORQUE kg-m	7.09	7.82	8.45	9.62	11	11.6
	OUTPUT OHL kg	90	100	110	120	140	200
70	INPUT HP	3.27	3.01	2.68	2.24	1.75	1.15
	OUTPUT HP	2.69	2.45	2.16	1.79	1.36	.86
	OUTPUT TORQUE kg-M	10.7	11.7	12.9	14.3	16.3	20.7
	OUTPUT OHL kg	140	150	160	170	200	300
80	INPUT HP	4.50	4.36	3.81	3.20	2.57	1.56
	OUTPUT HP	3.27	3.55	3.08	2.56	2.01	1.18
	OUTPUT TORQUE kg-m	14.8	17.0	18.4	20.5	24.0	28.3
	OUTPUT OHL kg	160	180	200	230	270	400
100	INPUT HP	6.50	5.98	5.26	4.49	3.51	2.27
	OUTPUT HP	5.37	4.90	4.30	3.64	2.78	1.74
	OUTPUT TORQUE kg-m	21.4	23.4	25.7	29.0	33.2	41.5
	OUTPUT OHL kg	190	200	220	240	300	440
120	INPUT HP	10.7	10.1	8.58	7.40	5.75	3.74
	OUTPUT HP	8.89	8.35	7.03	6.01	4.60	2.89
	OUTPUT TORQUE kg-m	35.4	39.9	42.0	47.9	55.0	69.1
	OUTPUT OHL kg	250	260	280	300	350	520
135	INPUT HP	17.7	16.5	14.2	12.0	9.54	6.20
	OUTPUT HP	15.0	13.9	11.9	10.0	7.83	4.94
	OUTPUT TORQUE kg-m	59.7	66.4	71.0	79.6	93.5	117
	OUTPUT OHL kg	330	340	360	440	500	800

SIZE	RATIO	20:1
SIZE	INPUT RPM	1800	1500	1200	900	600	300
50	INPUT HP	0.71	0.63	0.55	0.48	0.35	0.17
	OUTPUT HP	0.50	0.44	0.38	0.32	0.23	0.11
	OUTPUT TORQUE kg-m	4.00	4.25	4.58	5.07	5.43	5.43
	OUTPUT OHL kg	130	140	155	170	200	200
60	INPUT HP	1.18	1.06	0.95	0.79	0.64	0.37
	OUTPUT HP	0.89	0.79	0.69	0.57	0.44	0.24
	OUTPUT TORQUE kg-m	7.09	7.58	8.20	9.00	10.4	11.6
	OUTPUT OHL kg	130	140	155	170	200	200
70	INPUT HP	1.83	1.66	1.44	1.17	0.86	0.50
	OUTPUT HP	1.42	1.27	1.09	0.87	0.62	0.34
	OUTPUT TORQUE kg-M	11.3	12.1	13.0	13.9	14.7	16.0
	OUTPUT OHL kg	210	230	250	270	300	300
80	INPUT HP	2.48	2.25	1.97	1.65	1.32	0.87
	OUTPUT HP	1.91	1.71	1.47	1.21	0.93	0.57
	OUTPUT TORQUE kg-m	15.2	16.3	17.5	19.2	22.3	27.3
	OUTPUT OHL kg	270	280	320	360	400	400
100	INPUT HP	4.42	3.99	3.48	2.92	2.31	1.51
	OUTPUT HP	3.52	3.14	2.71	2.23	1.73	1.06
	OUTPUT TORQUE kg-m	28.0	30.0	32.3	35.5	41.3	50.0
	OUTPUT OHL kg	250	270	300	340	450	450
120	INPUT HP	6.85	6.31	5.53	4.68	3.70	1.95
	OUTPUT HP	5.40	4.92	4.26	3.53	2.71	1.68
	OUTPUT TORQUE kg-m	43.0	47.0	50.9	56.2	64.6	80.0
	OUTPUT OHL kg	370	390	420	460	520	520
135	INPUT HP	10.3	9.26	8.14	6.79	5.36	3.47
	OUTPUT HP	8.39	7.47	6.48	5.33	4.13	2.54
	OUTPUT TORQUE kg-m	66.8	71.3	77.4	84.9	98.6	121
	OUTPUT OHL kg	570	600	660	760	810	810

SIZE	RATIO	30:1
SIZE	INPUT RPM	1800	1500	1200	900	600	300
50	INPUT HP	0.62	0.55	0.45	0.36	0.25	0.13
	OUTPUT HP	0.42	0.37	0.30	0.23	0.16	0.08
	OUTPUT TORQUE kg-m	5.02	5.31	5.43	5.49	5.43	5.43
	OUTPUT OHL kg	150	170	180	200	200	200
60	INPUT HP	1.07	0.98	0.87	0.74	0.52	0.28
	OUTPUT HP	0.75	0.67	0.58	0.48	0.32	0.16
	OUTPUT TORQUE kg-m	9.0	9.60	10.3	11.15	11.6	11.6
	OUTPUT OHL kg	150	170	180	200	200	200
70	INPUT HP	1.56	1.41	1.26	1.06	0.85	0.43
	OUTPUT HP	1.12	0.98	0.85	0.71	0.53	0.29
	OUTPUT TORQUE kg-M	13.4	14.2	15.2	17.0	19.0	20.5
	OUTPUT OHL kg	240	260	280	300	300	300
80	INPUT HP	2.09	1.90	1.65	1.43	1.14	0.75
	OUTPUT HP	1.51	1.34	1.14	0.96	0.73	0.44
	OUTPUT TORQUE kg-m	18.1	19.2	20.5	22.9	26.2	31.4
	OUTPUT OHL kg	320	340	360	400	400	400
100	INPUT HP	3.69	3.33	2.93	2.47	1.97	1.15
	OUTPUT HP	2.70	2.40	2.06	1.71	1.30	0.70
	OUTPUT TORQUE kg-m	32.2	34.4	36.9	40.8	46.8	50.0
	OUTPUT OHL kg	320	340	370	450	450	450
120	INPUT HP	6.27	5.68	5.00	4.18	3.39	1.89
	OUTPUT HP	4.64	4.15	3.59	2.92	2.27	1.17
	OUTPUT TORQUE kg-m	55.4	59.4	64.3	69.8	81.4	84.0
	OUTPUT OHL kg	450	470	500	520	520	520
135	INPUT HP	8.76	7.87	6.86	5.82	4.64	3.02
	OUTPUT HP	6.65	5.90	5.07	4.20	3.23	1.96
	OUTPUT TORQUE kg-m	79.4	84.5	90.8	100	116	140
	OUTPUT OHL kg	680	710	710	810	810	810

SIZE	RATIO	40:1
SIZE	INPUT RPM	1800	1500	1200	900	600	300
50	INPUT HP	0.47	0.43	0.39	0.32	0.22	0.11
	OUTPUT HP	0.028	0.25	0.22	0.17	0.12	0.06
	OUTPUT TORQUE kg-m	4.53	4.82	5.41	5.43	5.43	5.43
	OUTPUT OHL kg	170	180	200	200	200	200
60	INPUT HP	0.78	0.71	0.64	0.54	0.43	0.24
	OUTPUT HP	0.51	0.45	0.39	0.32	0.24	0.12
	OUTPUT TORQUE kg-m	8.06	8.60	9.20	10.3	11.5	11.6
	OUTPUT OHL kg	170	180	200	200	200	200
70	INPUT HP	1.18	1.07	0.94	0.77	0.56	0.33
	OUTPUT HP	0.81	0.72	0.62	0.49	0.34	0.18
	OUTPUT TORQUE kg-M	12.9	13.7	14.8	15.5	16.2	17.4
	OUTPUT OHL kg	270	280	300	300	300	300
80	INPUT HP	1.60	1.47	1.29	1.10	0.86	0.54
	OUTPUT HP	1.08	0.96	0.83	0.68	0.52	0.30
	OUTPUT TORQUE kg-m	17.2	18.3	19.7	21.8	24.7	28.0
	OUTPUT OHL kg	340	360	400	400	400	400
100	INPUT HP	2.78	2.52	2.20	1.88	1.48	0.89
	OUTPUT HP	2.00	1.77	1.52	1.26	0.96	0.52
	OUTPUT TORQUE kg-m	31.8	33.8	36.3	40.2	45.7	50.0
	OUTPUT OHL kg	350	380	450	450	450	450
120	INPUT HP	4.48	4.07	3.56	3.03	2.44	1.57
	OUTPUT HP	3.13	2.79	2.99	1.97	1.51	0.88
	OUTPUT TORQUE kg-m	49.8	53.2	57.1	62.8	72.2	84.0
	OUTPUT OHL kg	500	500	520	520	520	520
135	INPUT HP	6.44	5.74	5.06	4.38	3.40	2.18
	OUTPUT HP	4.79	4.22	3.64	3.06	2.31	1.36
	OUTPUT TORQUE kg-m	76.3	80.7	86.9	97.4	110	130
	OUTPUT OHL kg	710	770	810	810	810	810

SIZE	RATIO	50:1
SIZE	INPUT RPM	1800	1500	1200	900	600	300
50	INPUT HP	0.39	0.37	0.31	0.26	0.18	0.09
	OUTPUT HP	0.23	0.21	0.17	0.14	0.09	0.04
	OUTPUT TORQUE kg-m	4.62	4.91	5.19	5.43	5.43	5.43
	OUTPUT OHL kg	200	200	206	200	200	200
60	INPUT HP	0.61	0.55	0.51	0.43	0.35	0.20
	OUTPUT HP	0.36	0.32	0.28	0.23	0.17	0.09
	OUTPUT TORQUE kg-m	7.10	7.60	8.30	9.10	10.2	11.6
	OUTPUT OHL kg	180	200	200	200	200	200
70	INPUT HP	0.87	0.79	0.71	0.61	0.50	0.30
	OUTPUT HP	0.52	0.46	0.40	0.33	0.25	0.15
	OUTPUT TORQUE kg-M	10.4	11.0	11.9	13.1	14.8	17.4
	OUTPUT OHL kg	280	300	300	300	300	300
80	INPUT HP	1.28	1.17	1.05	0.88	0.72	0.45
	OUTPUT HP	0.84	0.75	0.65	0.53	0.40	0.23
	OUTPUT TORQUE kg-m	16.8	17.8	19.3	21.2	23.9	28.0
	OUTPUT OHL kg	360	400	400	400	400	400
100	INPUT HP	2.78	2.52	2.20	1.88	1.48	0.89
	OUTPUT HP	2.00	1.77	1.52	1.26	0.96	0.52
	OUTPUT TORQUE kg-m	31.8	33.8	36.3	40.2	45.7	50.0
	OUTPUT OHL kg	350	380	450	450	450	450
120	INPUT HP	3.64	3.28	2.90	2.47	1.91	1.19
	OUTPUT HP	2.61	2.31	2.01	1.66	1.24	0.70
	OUTPUT TORQUE kg-m	52.0	55.2	60.1	66.0	74.2	84.0
	OUTPUT OHL kg	500	520	520	520	520	520
135	INPUT HP	4.84	4.41	3.90	3.34	2.61	1.69
	OUTPUT HP	3.52	3.16	2.73	2.26	1.71	1.01
	OUTPUT TORQUE kg-m	70.0	75.5	81.4	90.1	102	120
	OUTPUT OHL kg	770	810	810	810	810	810

SIZE	RATIO	60:1
SIZE	INPUT RPM	1800	1500	1200	900	600	300
50	INPUT HP	0.33	0.30	0.26	0.23	0.15	0.07
	OUTPUT HP	0.18	0.16	0.13	0.11	0.07	0.03
	OUTPUT TORQUE kg-m	4.31	4.61	4.83	5.41	5.43	5.43
	OUTPUT OHL kg	200	200	200	200	200	200
60	INPUT HP	0.51	0.47	0.42	0.35	0.29	0.19
	OUTPUT HP	0.29	0.26	0.22	0.18	0.14	0.08
	OUTPUT TORQUE kg-m	6.90	7.40	8.00	8.70	9.70	11.3
	OUTPUT OHL kg	200	200	200	200	200	200
70	INPUT HP	0.75	0.68	0.63	0.51	0.43	0.28
	OUTPUT HP	0.44	0.39	0.34	0.27	0.21	0.12
	OUTPUT TORQUE kg-M	10.4	11.1	12.0	13.1	14.7	17.1
	OUTPUT OHL kg	300	300	300	300	300	300
80	INPUT HP	1.03	0.95	0.85	0.73	0.58	0.39
	OUTPUT HP	0.62	0.55	0.48	0.39	0.29	0.17
	OUTPUT TORQUE kg-m	14.9	15.7	17.2	18.7	21.0	24.6
	OUTPUT OHL kg	400	400	400	400	400	400
100	INPUT HP	1.87	1.70	1.53	1.28	1.02	0.65
	OUTPUT HP	1.26	1.12	0.97	0.80	0.59	0.34
	OUTPUT TORQUE kg-m	30.0	32.0	34.6	38.0	42.4	49.3
	OUTPUT OHL kg	400	450	450	450	450	450
120	INPUT HP	2.89	2.65	2.36	2.04	1.45	0.96
	OUTPUT HP	1.98	1.76	1.53	1.26	0.94	0.56
	OUTPUT TORQUE kg-m	47.4	50.4	54.9	60.1	67.6	80.0
	OUTPUT OHL kg	520	520	520	520	520	520
135	INPUT HP	3.65	3.58	3.16	2.74	2.11	1.37
	OUTPUT HP	2.55	2.40	2.12	1.76	1.32	0.77
	OUTPUT TORQUE kg-m	60.8	70.0	76.0	83.9	94.4	111
	OUTPUT OHL kg	810	810	810	810	810	810