No.000187 Traverse Mechanism for Heavy Workpieces

Good IDEA!

6

Selection criteria

Choose the size based on workload.

Back to page top

Available sizes

■Linear Guides for Extra Super Heavy Load with Plastic Retainers, Interchangeable, Light Preload

Material	Hardness
Carbon Steel	58HRC-

■Sizes and Dimensions

Number of Blocks	Block Width	Block Length	Overall Height	Rail Length
1	44	91.8	30	220-1960
	48	107	36	220-1960
	60	124.6	42	280-1960
2	44	91.8×2 pcs.	30	220-1960
	48	107×2 pcs.	36	220-1960
	60	124.6 x 2pcs.	42	280-1960

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

Back to page top

Selection Steps

Linear guide selection steps

Back to page top

Accuracy Info

■Preload and Accuracy Reference (Linear Guides for Extra Super Heavy Load with Plastic Retainers, Interchangeable, Light Preload)

Back to page top

Performance info.

■Linear guide performance info. (Linear Guides for Extra Super Heavy Load 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
30	21.6	44.5	360	305	298
36	32.0	62.5	615	515	490
42	46.0	91.5	1000	885	870

Back to page top

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 with the temperature factor.
* 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-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.

Applicable load calculation method

When load is applied to the a block, convert 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

Back to page top

Selection criteria

Size according to pulley size, shaft size and allowable transmitted torque.

Back to page top

Available sizes

■MechaLock Standard Type (with Centering Function)

Body Material	Surface Treatment
1045 Carbon Steel	−
	Black Oxide
	Electroless Nickel Plating
304 Stainless Steel	−

■Sizes and Dimensions

Shaft Bore Dia.	Outer Ring Dia. (pilot)	Inner Ring O.D. (shoulder)	Shoulder Height	Pilot Length
φ28	φ46	φ50	3.5	17.3
φ30	φ48	φ52
φ32	φ50	φ54		18.3
φ35	φ57	φ62	4	19.5
φ38	φ60	φ65		20
φ40	φ62	φ67		20.5
φ42	φ64	φ69
φ45	φ67	φ72		21

Back to page top

Accuracy Info

■Recommended Tolerance of Applicable Shaft and Hub

	Tolerance	Finish Surface Roughness
Shaft O.D.	h7(g6)	Ra1.6 or less
Hub I.D.	H7	Ra3.2 or less

Back to page top

Performance info.

■Load info of the MechaLock Standard Type (with Centering Function)

Shaft Bore Dia.	1045 Carbon Steel / -, 1045 Carbon Steel / (Black Oxide)				1045 Carbon Steel / Electroless Nickel Plating			304 Stainless Steel/-
	Max Allowable Torque	Allowable Thrust Load	Screw Tightening Torque	Screw Tightening Torque	Max. Allowable Torque	Allowable Thrust Load	Screw Tightening Torque	Max Allowable Torque	Allowable Thrust Load	Screw Tightening Torque
			(N・m)	(N・m)
	(N・m)	(kN)	No Surface Treatment	Black Oxide	(N・m)	(kN)	(N・m)	(N・m)	(kN)	(N・m)
φ28	380	27	8.8	7.5	295	21.1	8.8	213.8	15.2	5.6
φ30	410				396	26.4		229.5	15.3
φ32	440				423			244.2	15.2
φ35	720	41.1	15.7	12.7	548	31.3	15.7	301.1	17.16	9.6
φ38	770	40.2			741	39		409	21.48
φ40	810				779			430.6
φ42	850				823	39.2		452.2
φ45	1200	52.9			882			484.6

Back to page top

Selection criteria

Easy to use/operate to adjust belt tension.

Back to page top

Available sizes

■Adjusting Bolt with Hex Socket Knurled Knobs

Screw Type	Material	Surface Treatment
Coarse Thread	1045 Carbon Steel	Black Oxide
		Electroless Nickel Plating
	304 Stainless Steel	−
Fine thread	1045 Carbon Steel	Black Oxide
		Electroless Nickel Plating

■Sizes and Dimensions

Thread Dia. x Pitch		Thread Length （5 mm increments）	Block Bearing Part		Knob		1045 Carbon Steel	304 Stainless Steel
Fine Thread	Coarse Thread		Diameter	Length	Length	O.D.
-	M3×0.5	10〜45	φ2.5	7	7	φ10	○	−
M4×0.5	M4×0.7	10〜60	φ3.5				○	○
M5×0.5	M5×0.8	10〜70	φ4.5	9	15	φ15	○	○
M6×0.75	M6×1.0	15〜80	φ5.5				○	○
M8×0.75	M8×1.25	20〜100	φ7.5	12			○	○
M10×1.0	M10×1.5	25〜100	φ9.5	16	25	φ20	○	−
M12×1.0	M12×1.75	25〜150	φ11.5	19			○	−
-	M16×2.0	25〜150	φ15.5			φ24	○	−

Back to page top

Accuracy Info

■Accuracy of the Adjusting Bolts

Block Support
Shaft Dia. Tolerance:　-0.1/-0.2
Length Tolerance:　+0.2/+0.1
Surface Roughness:　Ra1.6

Back to page top