No.000129 Compact Workpiece Transfer

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5

Selection criteria

Rail Strength

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Available sizes

■Linear Guides for Heavy Load, With Resin Retainer, Interchangeable, Light Preload

Type	Number of Blocks	Material	Hardness
Standard	1・2	Carbon Steel	58HRC〜
Wide Block Through Hole
Wide Block Tapped Hole

■Sizes and Dimensions

Block Type	Overall Height	Rail Length (Configure in 1 mm increments)		Block Dimension			Rail Width
		1 blocks	2 blocks	Width	Length
					1 blocks	2 blocks
Standard	24	100〜1480	160～1480	34	56.8	56.8 x 2 pcs.	15
	28	160〜1960	220〜1960	42	65.2	65.2 x 2 pcs.	20
	33	160〜1960	220〜1960	48	81.6	81.6 x 2pcs.	23
	42	200〜1960	280〜1960	60	96.4	96.4 x 2pcs.	28
Wide Block	24	100〜1480	160〜1480	52	56.8	56.8 x 2 pcs.	15
	28	160〜1960	220〜1960	59	65.2	65.2 x 2 pcs.	20
	33	160〜1960	220〜1960	73	81.6	81.6 x 2 pcs.	23
	42	200〜1960	280〜1960	90	96.4	96.4 x 2 pcs.	28

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Selection Steps

Linear guide selection steps

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Accuracy Info

■Preload and Accuracy Standard (Heavy Load Linear Guide With Plastic Retainers, Interchangeable, Light Preload)

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Performance info.

■Rated Load of Linear Guide (Heavy Load Linear Guide With Plastic Retainers, Interchangeable, Light Preload)

Overall Height	Basic Load Rating		Allowable Static Moment
	C (Dynamic) kN	C0 (Static) kN	MA N・m	MB N・m	Mc N・m
24	7.9	15.6	74	62	78
28	11.1	21.8	124	104	149
33	17.9	33.5	242	203	266
42	27.3	50.5	415	305	480

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Technical Calculations

Operating Life Calculation for Linear Guides

Operating 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 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 consider vibrations and impacts during motion as well as the distribution load applied to the linear guides.The operating environment temperature also effects the life of these parts. When taking these conditions into consideration, the calculation will be:

• 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 rail and ball bearings must have sufficient hardness. If they do not, the load rating decreases and the life will be reduced.

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 be reduced.
* Please use linear guides within the resistant temperature range on the 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

In general, it is common to use two or more blocks on one rail. In these cases, the load on each block will vary depending on the machining precision and will not have equally distributed loads. As a result, the allowable load per block will vary depending on the number of blocks used on the rail.

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 the load applied to the linear guides, in addition to the object weight, the inertia force attributed to the motion velocity, moment loads and the variations of each over time must be obtained. However, for reciprocating motion applications, it is difficult to obtain accurate calculations due to effects of the vibrations and shocks. therefor, use Table 2 to simplify the life calculations.

Applied Load P Calculation Method

When load is applied to the 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

Bracket mounting type required for this application

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Available sizes

■Floating Joint - Bracket Mounting Type

Part Name		Material	Surface Treatment
Main Body	Steel Ball Retainer Plate	Nitrile Rubber	-
	Rod Tip Socket	1018 Carbon Steel	Trivalent Chromate
	Cap	52100 Bearing Steel
	Steel Ball Retainer
	Ball Holder
	Case	Cast Iron Class No. 30
Thread		1018 Carbon Steel
Mounting Part	(M8〜M12)	Low Carbon Steel
	(M14〜M26)	Cast Iron Class No. 30	Enamel Paint (Blue)

■Sizes and Dimensions

Thread Dia. - Pitch	Overall Length	Main Body Outer Dia.	Overall Width	Core Height	Allowable Misalignment
M8−1.0	49.5	φ30	31	16	0.5
M10−1.25	61.5	φ36	43	19	0.75
M12−1.5
M14−1.5	110	φ51	51	26	1
M16−1.5
M18−1.5	120
M22−1.5	145	φ62	62	32	1.5
M26−1.5	173	φ69	69	37

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