No.000028 Vertical Feed Mechanism

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37

Selection criteria

Flanged type is suitable as a linear guide for this app. example.

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Available sizes

■Flanged Linear Bushings

Flange Shape	Outer cylinder			Ball	Retainer	Accessory Seal	Operating ambient temperature
	Material	Hardness	Surface treatment	Material	Material	Material
Round flange ・Square flange ・Compact flange	52100 Bearing Steel	58HRC-	-	52100 Bearing Steel	Resin (Duracon 90 equivalent)	Nitrile rubber	-20～80℃
			Electroless nickel plating	440C Stainless Steel

■Sizes and Dimensions

(Shaft DIA.)	Outer cylinder diameter	Overall length	Flange
			Max. width	Thickness
φ6	φ12	29	28	5
φ8	φ15	37	32
φ10	φ19	47	40	6
φ12	φ21		42
φ13	φ23		43
φ16	φ28	56	48
φ20	φ32	65	54	8
φ25	φ40	83	62
φ30	φ45	90	74	10

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Selection steps

■Linear bushing selection steps

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Accuracy Info

■Accuracy info. of flanged linear bushing

(Shaft DIA.)		Outer cylinder DIA.	Tolerance		Overall length tolerance
	tolerance		No surface treatment	Surface treated
φ6	0/-0.010	φ12	0/-0.013	0/-0.018	±0.3
φ8		φ15
φ10		φ19	0/-0.016	0/-0.021
φ12		φ21
φ13		φ23
φ16		φ28
φ20	0/-0.012	φ32	0/-0.019	0/-0.025
φ25		φ40
φ30		φ45

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Performance info.

■Load rating of flanged linear bushing

(Shaft DIA.)	Basic load rating		Allowable static moment
	C (Dynamic) N	C0 (Static) N	(N・m)
φ6	226	310	1.42
φ8	310	452	2.12
φ10	508	718	4.37
φ12	634	814	6.2
φ13	640	826	6.2
φ16	1164	1448	13.1
φ20	1554	2068	18.3
φ25	1725	3068	25.3
φ30	2440	3974	42.7

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Technical calculations

■Life of Linear Bushing

When the linear systems are in motion with loads, rolling surfaces and races are subject to repeated stress and will show scale-flaking due to material fatigue. The total run distance until the flaking appear is the "Life" .

The rated life can be calculated with the following formula based on basic dynamic load rating and the load applied on the bushing.

• 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: Applicable load (N)

Hardness factor (fH)

For linear systems, the shaft that the balls contact must have sufficient hardness,If the shaft does not have sufficient hardness, the load rating decreases and life will be reduced as a result.

Fig.-1. Hardness factor

Temperature factor (fT)

When the temperature of linear systems exceed 100℃, hardness will be reduced and as a result, the allowable loads and life will be reduced.

Fig.-2. Temperature factor

Contact factor (fC)

In general, it is common to use 2 linear systems are used for 1 shaft, in general. In these cases, the load on each linear system will vary depending on machining accuracies and will not have equally distributed loads. As a result, the allowable load per linear system will very 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, inertia force attributed to motion velocity, moment loads and variations of each over time must be obtained. However, for reciprocating motion applications, it is difficult to obtain accurate calculations due to the effects of vibrations and shocks. Therefor, use Table-2 below in order to simplify the Life Calculations.

Application conditions	fw
No external shocks or vibrations and speed is low 15m/min or less	1.0～1.5
No significant shocks or vibration and med. speed 60m/min or less	1.5～2.0
External shocks and vibrations exist and the speed is high 60m/min or over	2.0～3.5

Life in hours can be obtained by calculating travel distance per hour. When stroke length and stroke cycles are fixed, see the equation below.

• Lh: Life (Hr)
• L: Rated life (km)
• Ls: Stroke length (m)
• n1: Number of cycles per minute (cpm)

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Selection criteria

An inexpensive option for a guide component

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Available sizes

■Precision Linear Shafts - Straight Type

Material	Hardness	Surface treatment	O.D. tolerance
			g6	h5	f8
52100 Bearing Steel	Induction hardened 58HRC〜	−	○	○	−
440C Stainless Steel	Induction hardened 56HRC〜		○	○	−
52100 Bearing Steel	Induction hardened 58HRC〜	Hard chrome plating Plating hardness HV750~ Plating thickness 5μ or more	○	○	−
440C Stainless Steel	Induction hardened 56HRC〜		○	○	−
52100 Bearing Steel	Induction hardened 58HRC〜	Low temperature black chrome plating	○	−	−
1045 Carbon Steel	−	Hard chrome plating	−	−	○
		Plating hardness HV750~
304 Stainless Steel		Plating thickness 10μ or more	−	−	○

■Sizes

O.D. tolerance	O.D.	Length
		(Configure in 1mm increments)
g6・h5	φ3	10〜 400
	φ4
	φ5
	φ6	20〜 600
	φ8	20〜 800
	φ10
	φ12	20〜1000
	φ13	25〜1000
	φ15
	φ16	30〜1200
	φ18
	φ20
	φ25	35〜1200
	φ30	35〜1500
	φ35
	φ40	50〜1500
	φ50	65〜1500
f8	φ6	20〜 600
	φ8	20〜 800
	φ10
	φ12	20〜1000
	φ13	25〜1000
	φ15
	φ16	30〜1200
	φ18
	φ20
	φ25	35〜1200
	φ30	35〜1500
	φ35
	φ40	50〜1500
	φ50	65〜1500

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Accuracy Info

■O.D. tolerance table

O.D.	O.D. tolerance
	g6	h5	f8
φ3	-0.002 -0.008	0 -0.004	-
φ4	-0.004 -0.012	0 -0.005
φ5
φ6			-0.010 -0.028
φ8	-0.005 -0.014	0 -0.006	-0.013 -0.035
φ10
φ12	-0.006 -0.017	0 -0.008	-0.016 -0.043
φ13
φ15
φ16
φ18
φ20	-0.007 -0.020	0 -0.009	-0.020 -0.053
φ25
φ30
φ35	-0.009 -0.025	0 -0.011	-0.025 -0.064
φ40
φ50

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