No.000073 Press-Fitting Fixture

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7

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

Operating Life

When a Linear Guide is loaded and used in a linear reciprocating motion, scaly damage called flaking appear due to material fatigue as the stress works on the rolling elements and rolling contact surfaces constantly. Total travel distance until the first flaking occurs is called Life of Linear Guides.

Rated life

Rated life is the total travel distance that 90% of linear guides of the same type can reach, under the same conditions, with no occurrence of flaking damage. Rated life can be obtained from the Basic Dynamic Load Rating and the actual load applied on the linear bushings, as shown bellow.

Load must be calculated before actually using Linear Guides. To obtain load during linear reciprocating motion, it is necessary to fully consider vibration and impact during motion, and also distribution status in relation to Linear Guides. So, it is not easy to obtain load calculation. All these conditions considered, the above-mentioned calculation formula is 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)

For Linear Guide applications, sufficient hardness is required for ball contact shafts.Incorrect material hardness causes less allowable load, resulting in shorter life. Please correct the rated life according to the hardness factors.

Temperature Factor (fT)

If the Linear Guide temperature exceeds 100°C, the Linear Guide and shaft hardness decreases, resulting in less allowable load and shorter life than used at a room temperature. Please correct the rated life according to the temperature factors.
* Please use linear guides under the allowable temperature range shown on each product page.

Contact Factor (fC)

Table-1. Contact factor

Number of Linear Guide on One Shaft Contact Factor fc

1	1.00
2	0.81
3	0.72
4	0.66
5	0.61

In actual applications, 2 or more blocks per shaft are generally used. In this case, the load applied to each block varies depending on the precision of the machining, but is not uniformly distributed.

Load Factor (fW)

Table-2. Load factor

Condition of Use	fw
No shocks/vibrations, Low speed: 15 m/min. or less	1.0-1.5
No significant shocks/vibrations, medium speed: 60 m/min. or less	1.5-20
With shocks/vibrations, high speed: 60 m/min. or more	2.0-3.5

To calculate load applied to the Linear Guides, in addition to object weight, it requires inertia force.However, it is difficult to obtain accurate calculations due to potential vibrations and impacts created during the reciprocating motion, beyond the normal start-stop motion.

Applicable load calculation method

When load is applied to a block, convert moment load into applied load using the following formula:

• P: Applied Load (N)
• F: Downward Load (N)
• C0: 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
1213 Carbon Steel	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	φ1.8
4	10-20	Ｍ4	8	φ2
5	10-20	Ｍ5	10	φ3
6	10-25	Ｍ6	12	φ3.6
8	10-30	Ｍ8	16	φ5
10	15-30	Ｍ10	20	φ6
12	20-30	Ｍ12	24	φ6.5

＊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 (52100 Bearing Steel)	Stainless Steel (440C Stainless Steel)
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
φ3	φ10	3	W683ZZA
	φ12
φ4	φ13	4	W684AX50ZZ
	φ16	5	624ZZ
φ5	φ16		WBC5−13ZZ
	φ20		625ZZ
φ6	φ20		696ZZ
	φ28	6	626ZZ
φ8	φ28	7	608ZZ
	φ30		608ZZ
φ10	φ30	8	6000ZZ
	φ40	9	6200ZZ
φ15	φ40		6002ZZ
	φ45	11	6202ZZ
φ20	φ45	9	6904ZZ
	φ55	14	6204ZZ
φ25	φ65	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
φ10	38	28	9	4
φ12	53	34	10	6
φ13	66	44	13	7
φ16	79	59	16	6
φ16	79		16
φ20	102	78	20	9
φ20	114		23	15
φ28	218	157	44	39
φ28	208		42	35
φ30	−	176	81	65
φ30			94	51
φ40	−	274	136	93
φ40			122	96
φ45	−	343	109	102
φ45			130	98
φ55	−	490	225	176
φ65	−	750	333	250

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