No.000260 Rotating and Raising Mechanism

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19

Selection criteria

To handle the changes in work piece weight as well as the durability issues a angular contact bearing is used.

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Available sizes

■Angular Contact Bearings with Housings - Back-to-Back Combination + Deep Groove Ball Bearing, Flanged Type

(1) Angular Contact Bearings (Back-to-Back Combination)	(3) Holder, (4) Inner Ring Spacer, (5) Standard Cover, (6) Standard Cover, Oil Seal Cover, or O-Ring Cover, (7) Inner Ring Collar		(8) Cover Mounting Screw
(2) Deep Groove Ball Bearings
Material	Material	Surface Treatment	Material	Surface Treatment
52100 Bearing Steel	1045 Carbon Steel	Black Oxide	4137 Alloy Steel	Black Oxide
		Electroless Nickel Plating	304 Stainless Steel	-

■Sizes and Dimensions

Bearing No.	Cover Selection	Overall Length
7002	Standard Oil Seal For O-Ring	60	75
7003		70	85
7004		80	100
7005		100	125
7006		120	150
7007		140	175
7008		160	200
7009		180	225
7010		200	250

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Selection criteria

Select a reversed fastening type to firmly secure the shafts.

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Available sizes

■Brackets for Device Stands and Tightening from Separate Side- Flanged

Type	Material	Surface Treatment
Flange Pilot Flanged	1045 Carbon Steel	Black Oxide
		Electroless Nickel Plating
	304 Stainless Steel	-

■Sizes and Dimensions

Stand Shaft Bore Dia.	Flange O.D.	Flange Wrench Flats	Overall Length	Post Mounting Screws
6	28	12	16	M3
8	32	15	22	M4
10	38	18	26	M5
12	42	20	32	M6
13
15	48	32	40	M8
16
20	55	38	50	M10
25	75	50	62	M12
30	80	55	75	M16

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Selection criteria

Select a center flanged type so that the plate moving up and down is positioned at the center of the bearing.

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Available sizes

■Flanged Linear Bushings - Center Flange

Type	Outer Cylinder			Ball	Retainer	Operating Ambient Temperature	Accessory
	Material	Hardness	Surface Treatment	Material	Material
Round Flange Square Flange Compact Flange	52100 Bearing Steel	58HRC－	-	52100 Bearing Steel	Plastic (Duracon M90 Equivalent)	-20－80℃	Seal: Material Nitrile Rubber (-20 to 120°C)
					Stainless(SUS)	-20－100℃
			Electroless Nickel Plating	440C Stainless Steel	Plastic (Duracon M90 Equivalent)	-20－80℃
					Stainless Steel (SUS)	-20－100℃
	440C Stainless Steel	56HRC－	-		Plastic (Duracon M90 Equivalent)	-20－80℃
					Stainless Steel (SUS)	-20－100℃

■Sizes and Dimensions

I.D. (mm)	Length (mm)
6	35
8	45
10	55
12	57
13	61
16	70
20	80
25	112
30	123
35	135
40	151
50	192

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Selection steps

■Linear Bushing Selection Steps

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Accuracy Info

■Accuracy Info. of Flanged Linear Bushings

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Performance info.

■Speeds / Loads (Load Info.) of Flanged Linear Bushings

I.D. (mm)	Basic Load Rating
	Basic Dynamic Load Rating (N)	Basic Static Load Rating (N)
6	324	529
8	431	784
10	588	1100
12	657	1200
13	813	1570
16	1230	2350
20	1400	2740
25	1560	3140
30	2490	5490
35	2650	6270
40	3430	8040
50	6080	15900

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Technical calculations

■Life of Flanged Linear Bushings

When the linear system is loaded in linear reciprocating motion, scaly damages called flaking appear due to material fatigue as the repeated stress is applied on the rolling elements and the rolling contact surfaces constantly. Total travel distance until the first flaking occurs is called the life of linear system.

Rated life can be calculated with the basic dynamic load rating and the actual load applied on the linear bushings, as shown below.

• L: Rated Life (km)
• fH: Hardness Factor (See Fig.1)
• fT: Temperature Factor (See Fig.2)
• fC: Contact Factor (See Table-3)
• fW: Load Factor (See Table-4)
• C: Basic Dynamic Load Rating (N)
• P: Applied Load (N)

Hardness Factor (fH)

For liner system applications, sufficient hardness is required for ball contact shafts. Inappropriate hardness causes less allowable load, resulting in shorter life.

Fig. 1. Hardness Factor

Temperature Factor (fT)

When the temperature of linear system exceeds 100°C, the hardness of the system and shafts will be reduced and the allowable loads will also be reduced compared to being used at room temperature, resulting in a shorter life.

Fig. 2. Temperature Factor

Contact Factor (fC)

More than two linear systems are used for one shaft in general. In this case, the load applied to each linear system varies depending on machining precision and is not uniformly distributed. As a result, allowable load per linear system changes depending on the number of linear systems used on one shaft.

Table-3. Contact Factor

Number of Bearings Installed on One Shaft		Contact Factor fC
1		1
2		0.81
3		0.72
4		0.66
5		0.61

Load Factor (fW)

To calculate load applied to the linear system, in addition to object weight, it requires inertia force attributed to motion velocity or moment loads. Further, it is necessary to accurately determine the temporal change of each. However, it is difficult to calculation the load accurately due to potential vibrations and shocks caused by other element than repeated start-stop motions during reciprocating motion. Therefore, use the table below in order to simplify the life calculations.

Conditions of Use	fw
No shocks / vibrations, low speed: 15m/min. or less	1.0～1.5
No significant shocks / vibrations, medium speed: 60m/min. or less	1.5～2.0
With shocks / vibrations, high speed: 60m/min. or more	2.0～3.5

Life in hours can be obtained by calculating the travel distance per hour. When the stroke length and the number of strokes are constant, it can be calculated using the formula below.

• Lh: Life (Hr.)
• L: Rated Life (km)
• Ls: Stroke length (m)
• n1: Number of Cycles per Minute (cpm)

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