No.000073 Press-Fitting Fixture

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43

Selection criteria

Compact size suitable for the fixture design

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Available sizes

■Miniature Linear Guide (Standard block / Light preload)

■Sizes and Dimensions

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Selection steps

■ Miniature Linear Guide Selection Steps

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Accuracy Info

■ Preload and accuracy Standards

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Performance info.

■ Load rating of linear guides (Standard block ･ Light preload ･ High grade)

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Technical calculations

■ Linear guide life calculations

● Life

When the linear system is in motion with applied load, the rolling surfaces and races are subject to repeated stress. This stress can cause scale-like flaking due to material fatigue. The total run distance until the flaking appears is the "Life" of the linear system.

● Rated life

Rated life is a total distance 90% of linear guides reach without flaking when a group of the same guides are run under the same condition. The rated life can be calculated with basic dynamic load rating and the load applied on the guides as follows.

When using linear guides, load calculations are initially needed. It is not easy to calculate the loads during linear motion due to vibrations and shocks, as well as load distribution on the guides. Furthermore, operating environment temperature has large effect on life. When these conditions are taken in consideration, the calculations would be as follows.

• L: Rated life (km)
• fH: Hardness factor (see Fig-1)
• fT: Temperature factor (see Fig-2)
• fC: Contact factor (see Table-1)
• fW: Load factor (see Table-2)
• C: Basic dynamic load rating (N)
• P: Applicable load (N)

● Hardness Factor (fH)

In using linear guides, the shaft that balls contact must have sufficient hardness, If adequate hardness cannot be obtained, load rating decreases and life will be reduced as a result.

● Temperature Factor (fT)

When the temperature of linear guides exceed 100°C, hardness of blocks and rails will be reduced, causing reduction of life. Please compensate the life rating with temperature factor.
* Please use linear guides within temperature shown on product pages.

● Contact Factor (fC)

Table-1. Contact factor

Number of blocks installed on one rail and contact factor fC

1	1.00
2	0.81
3	0.72
4	0.66
5	0.61

In general, it is common to use 2 or more blocks on 1 rail. In such case, load applicable on each block would not be uniform due to machining variations. As the result, allowable load rating on each block would vary depending on the number of blocks used per rail. Please compensate the life rating with contact factor shown on Table-1.

● Load Factor (fW)

Table-2. Load factor

Conditions of Use	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 - 20
External shocks and vibrations exist and the speed is high 60m/min or over	2.0 - 3.5

When calculating loads applicable on linear guides, other than the weight of the object, inertial force due to motion speeds, moment loads, and variations of each over time must also be obtained accurately. However, accurate calculation would be difficult due to repeated starts and stops and various shocks and vibrations. Therefore, the Load Factors shown in Table-2 are used to simplify the life calculations.

● Applicable load calculation method

When moment loads apply a block, use the following formula to convert the moment load to applicable load.

• P: Applied Load (N)
• F: Downward Load (N)
• Co: Static Load Rating (N)
• MA: Allowable Static Moment - Pitching Direction (N･m)
• MC: Allowable Static Moment - Rolling Direction (N･m)
• Lp: Load Point Distance (m) in Pitching Direction
• Lr: Load Point Distance (m) in Rolling Direction

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Selection criteria

A durable anchor that meets the dimension requirements for this design.

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Available sizes

■Spring Anchors - Hexagonal

Material	Surface Treatment
EN 1.0715 Equiv.	Black Oxide
	Electroless Nickel Plating

■Sizes and Dimensions

Hex size	Mounting height (Increments of 5 mm)	Screw Dia. (Coarse)	Thread Length	Spring Latch Shaft Dia.
3	10 - 15	M3	6	Ø1.8
4	10 - 20	M4	8	Ø2
5	10 - 20	M5	10	Ø3
6	10 - 25	M6	12	Ø3.6
8	10 - 30	M8	16	Ø5
10	15 - 30	M10	20	Ø6
12	20 - 30	M12	24	Ø6.5

* Please see the product pages for dimension details.

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Selection criteria

Impact Resilient and operates quietly

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Available sizes

■Urethane Molded Bearings - Flat, Shape A

Tire Section			Bearing Material
Material	Hardness	Color	Steel (EN 1.3505 Equiv.)	Stainless Steel (EN 1.4125 Equiv.)
Urethane	Shore A95	Black	○	○
		White	○	○
	Shore A90	Black	○	○
		White	○	○
	Shore A70	Black	○	○
		White	○	○
	Shore A50	Black	○	-
		White	○	-
Anti-static Urethane	Shore A90	Gray	○	-

■Sizes and Dimensions

I.D.	O.D.	Width	Bearing Used
Ø3	Ø10	3	W683ZZA
	Ø12
Ø4	Ø13	4	W684AX50ZZ
	Ø16	5	624ZZ
Ø5	Ø16		WBC5-13ZZ
	Ø20		625ZZ
Ø6	Ø20		696ZZ
	Ø28	6	626ZZ
Ø8	Ø28	7	608ZZ
	Ø30		608ZZ
Ø10	Ø30	8	6000ZZ
	Ø40	9	6200ZZ
Ø15	Ø40		6002ZZ
	Ø45	11	6202ZZ
Ø20	Ø45	9	6904ZZ
	Ø55	14	6204ZZ
Ø25	Ø65	15	6205ZZ

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Performance info.

■Load Capacity of Urethane Molded Bearing - Flat

O.D.	Allowable Load N
	Shore A95	Shore A90	Shore A70	Shore A50
Ø10	38	28	9	4
Ø12	53	34	10	6
Ø13	66	44	13	7
Ø16	79	59	16	6
Ø16	79		16
Ø20	102	78	20	9
Ø20	114		23	15
Ø28	218	157	44	39
Ø28	208		42	35
Ø30	-	176	81	65
Ø30			94	51
Ø40	-	274	136	93
Ø40			122	96
Ø45	-	343	109	102
Ø45			130	98
Ø55	-	490	225	176
Ø65	-	750	333	250

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