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SMC Networks MY3A Series Operation Manual

Mechanically jointed rodless cylinder
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Doc. no. MY*A-OM0002H-D
PRODUCT NAME
Mechanically Jointed Rodless Cylinder
Basic short type
Basic standard type
Slide bearing type
MODEL/ Series
MY3A/3B/3M Series

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Summary of Contents for SMC Networks MY3A Series

  • Page 1 Doc. no. MY*A-OM0002H-D PRODUCT NAME Mechanically Jointed Rodless Cylinder Basic short type Basic standard type Slide bearing type MODEL/ Series MY3A/3B/3M Series...

  • Page 2: Table Of Contents

    Contents ・・・・・・・・・・・・・・・・・・・・ Safety Instructions Ｐ．３～９ １．Mounting １．１ Cylinder mounting face・・・・・・・・・・・・・・Ｐ．１０ １．２ How to mount・・・・・・・・・・・・・・・・・・・Ｐ．１０～１１ １．３ Piping・・・・・・・・・・・・・・・・・・・・・・Ｐ．１１ １．４ Cautions in mounting・・・・・・・・・・・・・・・Ｐ．１２～１３ １．５ How to mount a switch ・・・・・・・・・・・・・・Ｐ．１４ １．６ Auto Switch mounting positions・・・・・・・・・・Ｐ．１５～１６ ２．How to select of cylinder・ ・・・・・・・・・・・・・・Ｐ．１７～２９ ３．Replaceable parts and inspection, maintenance ３．１...

  • Page 3: Safety Instructions

    Operation manual of MY3A/3B/3M Series Safety Instructions These safety instructions are intended to prevent a hazardous situation and/or equipment damage. These instructions indicate the level of potential hazard by a label of “Caution”, “Warning”. To ensure safety, be sure to observe ISO4414(Note 1), JIS B 8370(Note 2) and other safety practices.
  • Page 4 ! Warning 1. The compatibility of pneumatic equipment is the responsibility of the person designs pneumatic system decides Instruction specifications. Since the products specified here are used in various operating conditions, their compatibility for the specific pneumatic system must be based on specifications or after analysis and/or tests to meet your specific requirements.
  • Page 5 5. There is a danger of sudden action by air cylinders if sliding parts of machinery are twisted, etc., and changes in forces occur. Instruction In such cases, human injury may occur; e.g., by catching hands or feet in the machinery, or damage to the machinery itself may occur.
  • Page 6 11. Design circuitry to prevent sudden lurching of driven objects. When a cylinder is driven by an exhaust center type directional control valve or when Instruction starting up after residual pressure is exhausted from the circuit, etc., the piston and its driven object will lurch at high speed if pressure is applied to one side of the cylinder because of the absence of air pressure inside the cylinder.
  • Page 7 Caution 1. Operate the piston within a range such that collision damage will not occur at the stroke end. Instruction Operate within a range such that damage will not occur when the piston having inertial force stops by striking the cover at the stroke end. Refer to the cylinder model selection procedure for the range within which damage will not occur.
  • Page 8 8. Be careful not to get hands caught in the unit. When using a product with stroke adjusting unit, the space between the slide table Instruction (slider) and the stroke adjusting unit becomes narrow, causing a danger of hands getting caught.
  • Page 9 15. Use the product within the specified range of fluid and ambient temperature. Take measures to prevent freezing, since moisture in circuits can be frozen under 5℃, Instruction and this may cause damage to seals and lead to malfunction. 16. Drain flushing Remove drainage from air filters regularly.

  • Page 10: １．Mounting

    １．Mounting １．１ Cylinder mounting face While a high level of flatness is desired for the surface on which the cylinder is to be mounted, if sufficient flatness cannot be attained, use shims to adjust the mounting of the cylinder so that the slide table can be operated throughout its stroke under the minimum operating pressure (0.15MPa).

  • Page 11: １．３ Piping

    [４] Also, consult with us in the case of overhang mounting.(Refer to Fig.-4) It may cause malfunction due to be deflected of tube. Slide table Head cover Cylinder tube Head cover Cylinder tube Slide table Fig.-3 Mounting at Slide table Fig.-4 Overhang mounting 〈Forbidden〉...

  • Page 12: １．４ Cautions In Mounting

    １－４ Cautions in mounting Caution ！ ①Be careful not to give a strong impact or an excessive moment to the slider. Prohibition ②Align carefully when connecting to a load having an external guide mechanism. Instruction ③Before mounting, the connection piping needs to be flushed sufficiently so that any dust or chips should not enter the cylinder.
  • Page 13 ⑧When the cylinder with long stroke is used, it may have deflection due to self-weight or load. In that case, use the cylinder by supporting the intermediate position Instruction with the side support so that the supporting interval (=L) shown Fig.-6 in the following is less than the value of graph (Fig.-7) Note) However, if accuracy of mounting surface of the cylinder tube is unknown, the side support may lead malfunction.

  • Page 14: １．５ How To Mount A Switch

    １－５ How to mount a switch ①Pick up the switch spacer by fingers, push it into the groove and confirm or correct the mounting direction. ②Slide the auto switch and lap it over the switch spacer. ③Tighten the switch mounting screw of accessory by flat head watchmakers screw driver.

  • Page 15: １．６ Auto Switch Mounting Positions

    １－６ Auto Switch mounting positions Ａ Ｂ Fig.-9 ＭＹ３Ａ D-A9, D-A9□V (mm) D-M9□ (mm) Bore size Operating range Bore size Operating range 10.5 36.5 156.5 40.5 152.5 42.5 197.5 46.5 193.5 42.5 231.5 13.5 46.5 227.5 53.5 266.5 57.5 262.5 ＭＹ３Ｂ/３Ｍ...
  • Page 16 Caution ！ ①Do not drop, bump or apply excessive impacts while handling. Prohibition ②Avoid repeatedly bending or stretching lead wires. Prohibition ③Do not use in strong magnetic field. Prohibition ④Auto switch can be placed at an intermediate position. However, it should be adjusted so that the cylinder speed is detected with in 300mm/sec considering the response time of load relay.

  • Page 17: ２ How To Select Of Cylinder

    ２ How to select of cylinder A general selection process to select MY3 series best suited to your application is introduced with the following flow. As for MY3A and MY3B series, how to select it varies according to an external guide’s presence As for guide selection to use a cylinder with external guides, please examine it by the guide manufacturer's materials for selection.
  • Page 18 ① Temporarily determine a model of cylinder First of all, you temporarily determine a model of cylinder. According to the operating purpose (a stroke accuracy, installing the stroke adjusting unit or not, operating speed), refer to Table-1, and do a temporary selection of cylinder model. Table -1.
  • Page 19 ② A cylinder individual operating selection (When you choose "Without external guides") ②－１ Examine allowable load and moment Static load (①maximum loading mass and ②static moment) and dynamic load (③ dynamic moment : at the time of collision) must be examined for calculation of allowable load.
  • Page 20 Reference formulae [Dynamic moment at impact] Use the following formulae to calculate dynamic moment when shock for stopper collision is taken into consideration. ｍ：Mass（ｋｇ） Ｖ：Collision speed（ｍｍ／ｓ） Ｆ：Load（Ｎ） Ｌ１：Distance up to center of ＦＥ：Load equivalent to impact（Ｎ） gravity of mass（ｍｍ） Ｖａ：Average speed（ｍｍ／ｓ） ＭＥ：Dynamic moment（Ｎ・ｍ）...
  • Page 21 ④ Examine cushion at the end of stroke（When you choose "Without external guides"） ④Examine cushion at the end of stroke （Refer to ④-1） Necessary Stroke ＯＫ ＯＫ Stroke adjusting Supposedly the Adjusting unit Necessity or not model is MY3M ＮＧ ＮＧ...
  • Page 22 "MY3A with external guides" ⑤ － １ － １ If stroke adjustment should be necessary ,consider installing an external shock absorber ,because MY3A series doesn't have a stroke adjusting unit (Refer to ⑥ for the examination of an external shock absorber.)
  • Page 23 ⑤－２．In the case of tentative selection of MY3B in ① Examine cushion at the end of stroke ⑤ （Refer to ⑤-2-1） Necessary Stroke adjusting Stroke Not necessary ＯＫ adjusting unit （Refer to ⑤-2-2） ＮＧ ＮＧ Air cushion Stroke ＮＧ ＯＫ Examine an external shock absorber ⑥...
  • Page 24 MY3 series has light-weight structure, so if the external shock absorber which generates the large anti-power is installed, a cylinder may be damaged by the Instruction shock-power at the end of stroke. So, it is need to have the shock absorber of low anti-power type used for the external shock absorber.
  • Page 25 ⑥－２ If you install an external shock absorber , It is necessary that a cylinder is operated within range of absorption capacity ,and shock-power (refer to Note 2) at the end of stroke becomes within range of the allowable shock-power (refer to catalog of MY3 series). Calculate shock-power by shock absorber manufacture's materials of selection.
  • Page 26 Example 1 : The examination of an external shock absorber in the case of "Without external guides". Operating conditions Cylinder：ＭＹ３Ａ２５－２００ Load Ｗ：２ｋｇ The center of gravity position： （ｘ ，ｙ ，ｚ）＝（０，１０，２０） Average speed Ｖ：５００ｍｍ／ｓ Operating pressureＰ：０．５ＭＰａ An external shock absorber： Our product of adjustment type shock absorber ＲＢ－ＯＥＭ０．２５Ｍ...
  • Page 27 a. The calculation of allowable load and moment Load Static load Load applied to guide ① Load weight in horizontal direction by W Ｍ Moment generated by Fe when stopping ② 　　　　→　m max.（by using Table-MY3A/m ） 　1．Calculation of 6.40 ＝ static load Load factor α1 ＝m1/m1max＝...
  • Page 28 Example 2: The examination of an external shock absorber in the case of “With external guides" Operating conditions Load：８ｋｇ Average speed Ｖ：７００ｍｍ／ｓ（Impact speed Ｖmax：９８０ｍｍ／ｓ） Operating pressure：０．５ＭＰａ The external shock absorber：Our company product of adjustment type shock absorber ＲＢ－ＯＥＭ０．２５Ｍ How to collide：horizontal movement-propulsion force by cylinder entails it case External guide：Installed Load: 8Kg ＲＢ－ＯＥＭ0.25...

  • Page 29: ３．Replaceable Parts And Inspection, Maintenance ３．１ Replaceable Parts

    From ①, ② The calculated shock-power (659.79N)> The allowable shock-power (580N) It is outside range of the allowable one, it is necessary for changing of bore size or type of shock absorber (changing to lower anti-power type) or the consideration the operating condition (speed, load etc.).

  • Page 30: ４．２ Intermediate Stop

    ４．２ Intermediate stop ① Mechanically jointed rodless cylinder has a structure allowing a little air leakage. Therefore intermediate stop position can’t be hold with close circuit. Instruction If necessary, select the machine for intermediate stopping. For details, consult SMC. ② MY3 series may be damaged when the slide table is made to intermediate stop by the mechanical stopper without absorption, because it has light structure.

  • Page 31: ４．４ Parallel Operation Of Cylinders

    ⑤ If stroke-positioning with absorption is necessary, give it as a structure that the external shock absorber is caught directly at the gravity position of load. (Refer to Fig.19) Stroke adjusting unit Floating bracket External guides Stroke adjusting unit Fig.-18 In the case of installing the external absorber with external guides Fig.-18 In the case of installing the external absorber with external guides External shock absorber Please absorb in the...

  • Page 32: ４．５ Air Leakage Caused By Detachment Of Seal Belt

    ４．５ Air leakage caused by detachment of seal belt When the mechanical joint type rodless cylinder (slit type: holding the seal belt on the side of the slit) is used, negative pressure may occur in the cylinder due to external and inertia force because of its structure. In this case, depending on the operating conditions, if the seal belt comes off, external leakage may occur temporarily.

  • Page 33: ４．６ About Rubber Bumper Displacement

    ４．６ About rubber bumper displacement (applied to only MY3A). Stroke position with built-in rubber bumper of MY3A series varies according to the operating pressure. If you need standards for the position at the end of stroke, you calculate displacement in operating pressure by the graph of "displacement of Rubber bumper"...

  • Page 34: ４．７ Air Cushion Adjustment

    ②How to calculate displacement at the end of lift. You subtract the air pressure equivalent to self-weight, "P (=0.02MPa)", from the operation pressure (0.5MPa). Referring to the graph of "displacement of Rubber bumper” (refer to catalog), you confirm the displacement of Rubber bumper. It is equal to 1.2mm when the operation pressure is equal to 0.48MPa.

  • Page 35: Applicable Grease

    Applicable grease The recommended grease is a SMC grease package GR-S-10(10g) or GR-S-20(20g). If it is not available, the following grease commercially available are compatible with the seal and applicable. When any other grease than the SMC grease package is used, please wipe off the grease applied and avoid using the grease of same brand but a different grade and consider the conditions of oil supply described in the instruction sheet of the grease.
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  • Page 42 Revision history ・Ver.D Add bore size of MY3A/B series Correction applicable grease 4-14-1, Sotokanda, Chiyoda-ku, Tokyo 101-0021 JAPAN Tel: + 81 3 5207 8249 Fax: +81 3 5298 5362 http://www.smcworld.com Note: Specifications are subject to change without prior notice and any obligation on the part of the manufacturer. ©...

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