No.000111 Z-axis Elevating Mechanism

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53

Selection criteria

Effective as a linear motion system to move the table up/down by diagonally mounting.

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Available sizes

■Miniature linear guide (Standard block with dowel holes, Slight clearance, Standard grade)

Material	Hardness
440C Stainless Steel	56HRC-
Carbon steel	58HRC-

■Sizes and Dimensions

Number of blocks	Block		Overall height	Rail length	Dowel hole
	Width	Length			DIA.	Depth
1	17	23.6	8	40-130	φ3	2
	20	30	10	35-275		2.5
	27	33.9	13	45-470		3
	32	42.4	16	70-670		4
	40	50	20	100-700		4
2	17	23.6 x 2pcs.	8	70-130		2
	20	30 x 2pcs.	10	95-275		2.5
	27	33.9 x 2pcs.	13	120-470		3
	32	42.4 x 2pcs.	16	150-670		4
	40	50 x 2pcs.	20	160-700		4

* 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 standards (Standard block with dowel holes, Slight clearance, Standard grade)

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Performance info.

■Load capacity of linear guide (Standard block with dowel holes, Slight clearance, Standard grade)

Overall height	Basic load rating		Allowable static moment
	C (Dynamic) kN	Co (Static) kN	MA N・m	MB N・m	Mc N・m
8	0.9	1.5	4.1	4.1	5.2
10	1.5	2.5	5.1	5.1	10.2
13	2.2	3.3	8.8	9.5	16.1
16	3.6	5.4	21.6	23.4	39.6
20	5.2	8.5	48.4	48.4	86.4

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Technical calculations

Linear guide life calculations

Life

When linear guides operate in linear motion while supporting loads, repeated stresses apply on the rolling elements (balls) and raceways (rails), eventually causing scale-like flaking due to material fatigue. The total run distance until this flaking appears is defined as linear guide's "Life".

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.
Please compensate the life value with the hardness factor.

Temperature factor (fT)

When the temperature of linear guides exceed 100℃, 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 the resistant temperature range 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

App.condition	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: Applicable 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

Effective as a motion transmission device to move the tale, etc.

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Available sizes

■Lead screw support unit

Lead screw			Compatible lead screw nut
Type	Material	Surface treatment	Type	Material
Right hand thread ・ Lent hand thread	1045 Carbon Steel	?	Right hand thread ・ Lent hand thread	Brass
		Black oxide
		Low temperature black chrome plating
	303 Stainless Steel	?

■Sizes and Dimensions

Screw shaft nominal DIA.	Pitch	Overall length	Applicable bearing		Handle mounting shaft
		1mm increment	I.D.	Width	DIA.	Length
12	2	80～1000	φ8	≦7	φ6	2～80
14	3		φ10	≦8	φ8
16		100?1200	φ12	≦8	φ10	2～95
18	4	150?1200
20			φ15	≦9	φ12	2～100
22	5
25

* Manufacturable ranges vary slightly depending on material, screw shaft nominal DIA. Please see the product pages for details.

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Accuracy Info

■Lead screw: Screw shaft runout tolerance (Max.)

■Lead screw accuracy standards

Item	Value
Allowable dimension limit and tolerances	JISB0217 0218
Screw accuracy	7e Class
Nut accuracy	7H Class
Single pitch error	±0.02
Cumulative pitch error	±0.15/300mm
Length tolerance	JISB0405(Medium class)
Screw shaft end DIA. tolerance	h7

■Shaft end DIA. tolerance

Bearing shaft DIA.	Shaft end DIA.	Tolerance
φ8	φ5	+0.075/0
φ10	φ9.6	0/-0.09
φ12	φ11.5	0/-0.11
φ15	φ14.3

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Technical calculations

■Lead screw・Lead screw nut selection steps

In order to verify contact surface pressure and sliding speed not to cause abnormal wear on the lead screw nut, obtain surface contact pressure P and sliding speed V.
Plot the calculated P and V values against the PV value graph and confirm the intersection.
If the intersection falls inside of line ① and ②, it is determined that abnormal wear would not occur.

① Contact surface pressure P (N/mm²)

② Sliding speed V (m/min)

③ Screw efficiency η

④ Load torque (N・cm)

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Selection criteria

Effective as a counter mountable without taking up a large space.

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Available sizes

■Compact digital position indicator (Standard, Compact type)

Cover		Displayed digits	Rotation direction	Back plate	Sleeve		Accessory
Material	Color			Material	Material	Surface treatment	Set screw	Cushion sheet
Nylon	Orange	4 digits・5 digits	Right・Left	Polyphenylene ether	1215 Carbon Steel	Black oxide	4137 Alloy Steel	Polyethylene foam (Black)
	Silver	4 digits					(Black)

■Specifications and Dimensions

Spindle pitch	Count increment per revolution		Max. rotational speed	Applicable shaft DIA.	Reference dimension
	4 digits	5 digits	(rpm)		Depth	Overall width	Overall height
2	0002.0	00002.0	150	φ6 φ8 φ10 φ12 φ14	（33）	33	47
3	0003.0	00003.0	100
4	0004.0	00004.0	75
5	0005.0	00005.0	60
6	0006.0	00006.0	50

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