No.000281 Centering mechanism

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17

Selection criteria

Select the standard item to use as the fulcrum of the link rotation

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Available sizes

■Cantilever Shafts - Pilot Type - Standard, Threaded, with Tapped End

Material	Surface Treatment
EN 1.1191 Equiv.	Black Oxide
	Electroless Nickel Plating
EN 1.4301 Equiv.	-

■Sizes and Dimensions

Pin Dia. (mm)	(1 mm Increments)				M(Coarse)
	Y	F	G	N
6	2-60	5-100	5-10	6-12	M6
8				8-16	M8
10				10-20	M10
12		10-150	5-15	12-24	M12
13
15
16
17			5-20
18
20	4-75			20-40	M20
					M16
22					M20
					M16
25					M20
					M16
30					M20
					M16

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Accuracy Info

■Accuracy of Cantilever Shafts

Perpendicularity: 0.02

Pin Dia. (mm)	Tolerance g6 (mm)
6	-0.004 -0.012
8	-0.005 -0.014
10
12	-0.006 -0.017
13
15
16
17
18
20	-0.007 -0.020
22
25
30

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Selection criteria

Select a linear guide to obtain the accurate motion of claws.

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Available sizes

■Miniature Linear Guide - Short Block

Material	Hardness
Stainless Steel	56 HRC or more
Free Cutting Steel (Alloy Steel including SCM)	58 HRC or More

■Sizes and Dimensions

Overall Height	Block Width	Block Length	Rail Length
8	17	19.6	40 ~ 130
10	20	22.9	35 ~ 275
13	27	27	45 ~ 470
16	32	32.7	70 ~ 670

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Selection steps

■Miniature Linear Guide Selection Steps

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Accuracy Info

■Preload and Accuracy Standards (Normal Preload, Slight Clearance type)

Light Preload, Slight Clearance Type

	Light Preload High Grade	Slight Clearance Standard Grade
Radial Clearance	-3 ~ 0	0 ~ +15

Dimensional Accuracy(μm)		High Grade	Standard Grade
H Dimension Tolerance		±20	±20
Pair Variation of H		15	40
W2 Dimension Tolerance		±25	±25
Pair Variation of H		20	40

■Running Parallelism

* The slight clearance type has clearances (play) between the rails and blocks.

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Performance info.

■Load Rating of Miniature Linear Guides (Short Blocks, Light Preload / Slight Clearance Type)

Overall Height	Basic Load Rating		Allowable Static Moment
	C (Dynamic) kN	Co (Static) kN	MA N ･ m	MB N ･ m	Mc N ･ m
8	0.79	1.27	1.9	1.6	4.6
10	1.16	1.68	3.1	2.6	7.9
13	1.63	2.38	5.2	4.4	14.8
16	3.08	4.23	12.3	10.3	32.6

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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: Applied Load (N)

●Hardness Factor (fH)

For linear applications, the shafts and ball bearings must have sufficient hardness. If they do not, the load rating decreases and the life will be reduced.
Please correct the rated life with the hardness factor.

●Temperature Factor (fT)

When the temperature of the linear system exceeds 100 degrees C, the hardness will decrease and as a result, the allowable load and life will reduced.
* Please use Linear Guides at within the heat resistance temperature ranges 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-linear guide allowable load varies depending on the number of linear guides per rail.
Please compensate rated life with Contact Factors on Table - 1.

●Load Factor (fW)

Table-2. Load Factor

Condition of Use	fw
No external 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 external shocks / vibrations, high speed exceeding 60 m/min	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: 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

Select a drive source with guides to omit the linear motion guide of one side.

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Available sizes

■Air Linear Guides - MPPU10 Series

Cyl. Bore	Horizontal (mm)	Vertical (mm)	Thickness (mm)	Stroke Length (mm)
Ø10	27	70	20	15
		85		30
		100		45
Ø12	32	76	22	20
		86		30
		101		45
		116		60

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Accuracy Info

Bore Dia.		Ø10	Ø12
Stroke		15/30/45	20/30/45	60
Parallelism	Plane C to Plane A	0.02	0.02
	Plane D to Plane B	0.02	0.02
Running Parallelism	Plane C to Plane A	0.004	0.004	0.006
	Plane D to Plane B	0.004	0.004	0.006
Perpendicularity	Plane E to Plane A	0.15	0.15
	Plane E to Plane B	0.15	0.15
J Dimension Tolerance		±0.025	±0.025
F Dimension Tolerance		±0.2	±0.2
G Dimension Tolerance		±0.2	±0.2
H Dimension Tolerance		±0.05	±0.05

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Performance info.

■Speeds / Loads (Load Info.) of Air Linear Guides

■Operating Pressure Range

Min. Operating Pressure (MPa):　0.15
Max. Operating Pressure (MPa):　0.70
Pressure Resistance (Mpa):　1.05

■Theoretical Thrust

■Basic Static Load Ratings / Allowable Static Moments

Cyl. Bore	Stroke (mm)	Basic Static Load Rating Co(kN)	Allowable Load Moment N･m
			Pitching	Yawing	Rolling
Ø10	15/30/45	3.4	20.5	24.5	22.5
Ø12	20/30/45/60	4.9	32.3	38.2	41.1

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