No.000172 Space-Saving Long-Stroke Mechanism

Good IDEA!

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Selection criteria

Effective for building a small-sized linear motion system

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Available sizes

■Compact Cylinders

Tube I.D.	External Size	Rod Tip Screw		Stroke St												Body Length （+ St shown below)	Rod Tip Length
		Screw Type	Dia. - Pitch
				5	10	15	20	25	30	35	40	45	50	75	100
φ12	□25	Tapped	M3×0.5	○	○	○	○	○	○	−	−	−	−	−	−	22	3.5
φ16	□29		M4×0.7	○	○	○	○	○	○	−	−	−	−	−	−
φ20	□36		M5×0.8	○	○	○	○	○	○	○	○	○	○	−	−	29.5	4.5
φ25	□40		M6×1.0	○	○	○	○	○	○	○	○	○	○	−	−	32.5	5
φ32	□45		M8×1.25	○	○	○	○	○	○	○	○	○	○	−	−	33	7
φ40	□52			○	○	○	○	○	○	○	○	○	○	○	○	39.5
φ50	□64		M10×1.5	−	○	○	○	○	○	○	○	○	○	○	○	40.5	8
φ63	□77			−	−	−	−	−	○	−	−	−	○	○	○	46
φ12	□25	Threaded	M5×0.8	−	○	−	○	−	○	−	−	−	−	−	−	22	14
φ16	□29		M6×1.0	−	○	−	○	−	○	−	−	−	−	−	−		15.5
φ20	□36		M8×1.25	−	○	−	−	−	○	−	−	−	○	−	−	29.5	18.5
φ25	□40		M10×1.25	−	○	−	−	−	○	−	−	−	○	−	−	32.5	22.5
φ32	□45		M14×1.5	−	○	−	−	−	○	−	−	−	○	−	−	33	28.5
φ40	□52			−	○	−	−	−	○	−	−	−	○	−	○	39.5
φ50	□64		M18×1.5	−	○	−	−	−	○	−	−	−	○	○	○	40.5	33.5
φ63	□77			−	−	−	−	−	○	−	−	−	○	○	○	46

* Sensors are sold separately

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Selection steps

■Selection procedure of compact cylinders (See "Technical Information" shown below for details.)

1. Define various conditions of the load

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2. Calculate cylinder output (In case of double acting type)

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3. Determine the tube I.D.

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4. Determine the theoretical reference speed

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5. Verify the cylinder's cushion mechanism

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6．Verify the lateral load applicable to the cylinder

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Performance info.

■Load Information of Compact Cylinders

Min. Operating Pressure: 0.1 MPa

Max. Operating Pressure: 1.0 MPa

Theoretical Output (N)　：

Tube I.D.	Operation Direction	Operating Pressure (MPa)
		0.4	0.5
φ12	Outstroke	45	57
	Instroke	34	42
φ16	Outstroke	80	101
	Instroke	60	75
φ20	Outstroke	126	157
	Instroke	94	118
φ25	Outstroke	196	245
	Instroke	151	189
φ32	Outstroke	322	402
	Instroke	241	302
φ40	Outstroke	503	628
	Instroke	422	528
φ50	Outstroke	785	982
	Instroke	660	825
φ63	Outstroke	1247	1559
	Instroke	1121	1402

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Selection criteria

Effective for building a small-sized linear motion system

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Available sizes

■Miniature Linear Guide - Short Block

Material	Hardness
Stainless Steel (440C Stainless Steel)	56HRC-
Carbon steel (Alloy Steel including SCM)	58HRC-

■Sizes and Dimensions

Number of Blocks	Block Width	Block Length	Overall Height	Rail Length
1	17	19.6	8	40-130
	20	22.9	10	35-275
	27	27	13	45-470
	32	32.7	16	70-670
2	17	19.6 x 2pcs.	8	55-130
	20	22.9 x 2pcs.	10	75-275
	27	27×2pcs.	13	95-470
	32	32.7×2pcs.	16	110-670

* Please see the product pages for details of selectable sizes.

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Selection Steps

■Miniature linear guide selection steps

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Accuracy Info

Preload and Accuracy Reference (Standard Blocks / Light Preload / High Grade)

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Technical Calculations

Operating Life Calculation for Linear Guides

Operating Life

When the linear guide is loaded in linear reciprocating motion, scaly damages called flaking appear due to material fatigue as the stress works on the rolling elements (steel balls) and the rolling contact surfaces (rails) constantly. Total travel distance until the first flaking occurs is called the 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 calculated with the basic dynamic load rating and the actual load applied on the linear guides, as shown below.

Load must be calculated before actually using linear guides. To obtain loads during linear reciprocating motion, it is necessary to fully consider vibrations and impacts during motion as well as distribution condition of the load applied to linear guides. So, it is not easy to calculation the loads. Operating temperature also critically affects the life. Considering these conditions, the above-mentioned calculation formula will 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)

For liner guide applications, sufficient hardness is required for ball contact shafts. Inappropriate hardness causes less allowable load, resulting in shorter life.
Please correct the rated life with the hardness factor.

Temperature factor (fT)

When the temperature of linear guides exceeds 100°C, the hardness of guides and shafts will be reduced, and the allowable loads will also be reduced compared to being used at room temperature, causing a reduction of life. Please correct the rated life by the temperature factor.
* Please use Linear Guides within the resistant temperature range shown on product pages.

Contact factor (fC)

Table-1. Contact factor

Number of Blocks per Rail Contact Factor fC

1	1.00
2	0.81
3	0.72
4	0.66
5	0.61

For actual applications, more than two blocks are generally used per shaft. In this case, the load applied to each block varies depending on machining precision and is not uniformly distributed. As a result, per-block allowable load varies depending on the number of blocks per rail. Please compensate the rated life with contact factors on Table-1.

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 attributed to motion velocity or moment loads. 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. Thus, Table-2 load factor helps simplify the life calculation.

Applied Load P Calculation Method

When moment load is applied to each block, convert the moment load into applied load by the following formula.

• P: Applicable 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

Suitable for absorbing deviations in the radial direction.

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Available sizes

■Floating Connectors - Extra Short Threaded Stud Mount

Body / Cover		Joints			Spring	Washer
Material	Surface Treatment	Material	Surface Treatment	Hardness	Material	Material	Surface Treatment	Hardness
1045 Carbon Steel	Black Oxide	1045 Carbon Steel	Black Oxide	35 - 45 HRC	304 Stainless Steel−WPB	304 Stainless Steel	Nitriding Treatment	600HV -
304 Stainless Steel	−	440C Stainless Steel	−

■Sizes

Cylinder Mounting Side		Output Side		Allowable Misalignment [U]	Allowable Angular Deviation [A]	Body Thickness	Body Hex size	Overall Length
Screw Dia.-Pitch	thread length	Screw Dia.-Pitch	thread length
M5－0.8	6	M8－1.25	8.5	0.5	4°	14	24	33
M6－1.0
M8－1.25	8.5	M10－1.5	10			15.5	27	39.5
M10－1.5	10	M14－2.0	11			19.5	30	47

＜Allowable lateral misalignment U and allowable angular misalignment A＞

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