1. MY1C Series Rodless Cylinder
Series MY1C

2. What is a Rodless Cylinder? Sizing and Moments Features and Benefits
Agenda
What is a Rodless Cylinder?
Sizing and Moments
Features and Benefits
Maintenance
Series MY1C

3. What is a Rodless Cylinder?
Pneumatic rodless cylinders, including the mechanical joint type MY1C Series, were developed to provide linear motion with minimum space requirements. They are a low cost alternative to the much higher priced electrically driven linear slides commonly referred to as “servos”.
Series MY1C

4. What is a Rodless Cylinder?
Space savings - 1/2 the overall length of a conventional cylinder
Rodless Cylinder
Conventional Cylinder
5’ stroke
5’ stroke
Additional 5’
Series MY1C

5. What is a Rodless Cylinder?
An internal piston drives the slider block which is coupled by a “floating” mechanical joint.
Slider Block
Mechanical Joint
Piston
Series MY1C

6. What is a Rodless Cylinder?
Guides are incorporated for load carrying capability
The MY1C series uses a Cam Follower Guide for High Loads and a Table Accuracy of +/- 0.05mm
The MY1C is not just a cylinder. It is an engineered product
Series MY1C

7. Sizing and Moments YAW ROLL PITCH SMC Training
There are 3 main axes of movement, PITCH, YAW, and ROLL.
In determining the forces on an actuator, proper selection requires an understanding and calculation of these forces --- referred to as specific moments, or:
M1 PITCH
M2 YAW
M3 ROLL
SMC Training

8. Sizing and Moments M1 PITCH M3 YAW M2 ROLL SMC Training
Rodless Cylinders are selected when extreme precision is required --- holding tolerance throughout full stroke--- in spite of moments that would deflect normal cylinders.
These moments are categorized as M1, M2, and M3; illustrating forces that are part of the process.
M1 PITCH W
Side view
M3 YAW
M2 ROLL W
Top view W
End view
SMC Training

9. Sizing and Moments M1 PITCH M2 ROLL M3 YAW SMC Training
Side view
Sometimes the moment is eccentric (off centerline) and this poses additional calculations and concerns. Consult the catalog for assistance in determining what moments are acceptable for each bore within an MY series…. you must know the application.
M2 ROLL
M3 YAW W
Top view W
End view
SMC Training

10. MY1C Series Feature and Benefits
7 Bores sizes - 16 ~ 63mm bore
Stroke ranges from 100 ~ 5000mm
Repairable
Precise Cam Follower Guide system
Centralized piping
Stroke adjusting units with hard stops or shock absorbers
Autoswitch capable
Adjustable air cushions
“Floating joint” mechanical connection between the piston and slide table
Side Supports
Debris Cover
The MY1C is one in a family of seven
different mechanically coupled rodless
cylinders:
MY1B- Basic
MY1M- Slide Bearing
MY1C- Cam Follower Guide
MY1H- High Precision Guide
MY2H- L.P. High Precision Guide
MY2HT- L.P. Dual High Precision Guide
MY1TH- Heavy Duty
Series MY1C

11. Construction
Series MY1C

12. Preventive Maintenance
Filtration - Always 5 micron or better, no oil or lubricant
Grease - Apply grease (Lithium Soap Based - See Text) monthly to all bearing contact surfaces and to the dust seal band
Tightening or Replacement of the Dust Seal Band - The Dust Seal can stretch over time, and needs to be tightened or replaced. (Note standard and wide bands)
Leakage- Leakage is inherent to mechanically coupled rodless cylinders due to their design. A small amount of air leakage (300 Ncc/min or 0.3 l/min) is expected.
Series MY1C

13. Repair Kits Series MY1C Dust Seal Band Part Number:
MY1M32-PSS2.5, Std. Width, 2.5m
MY1M32-PSS5.5, Std. Width, 5.5m
MY1M32-PSW2.5, Wide width, 2.5m
MY1M32-PSW5.5, Wide width, 5.5m
*Includes grease and and set screws
Note:
The dust seal band can be ordered in two different widths, a standard, and a wide band. The grooves in the cylinder tube extrusions vary, and must be measured before assembly.
To identify band width check the set screws that hold the band in place. If they are black, then use the standard band. If they are silver, then use the wide band.
If this dimension is larger than 15.2mm, then
use the wide band,
Series MY1C

14. Repair Kits Series MY1C Seal Belt Part Number: MY1M32-PSB2.5, 2.5m
*Includes grease and belt clamps
Series MY1C

15. Repair Kits Series MY1C Seal Kit Part Number: MY1M32-PSQ
*Includes tube gaskets, piston seals, cushion seals
grease and belt clamps.
Table End Cover Kit
Part Number: MY1M32-PSC
*Includes scrapers, grease, end covers
stoppers, spacers, and screws.
Series MY1C

16. Dust Seal Band Maintenance
Tightening the Dust Seal Band
Disassembly
Loosen the two set screws on one of the head covers. This will allow one end of the dust seal band to “float”
Adjustment
Cycle the cylinder’s slide table by hand three or four times, and return the table to the end were the dust seal band is not fixed. During the last stroke slide your thumb across the dust seal band to remove any slack.
Series MY1C

17. Dust Seal Band Maintenance
Tightening the Dust Seal Band - con’t
Assembly
Tighten the two remaining set screws to fix the dust seal band.
Cycle the cylinder’s table by hand to see if there is any slack. If slack is present the band needs to be replaced.
If the band is ok, then uniformly apply Lithium Soap based grease to the band. Cycle, and remove any excess grease.
Series MY1C

18. Seal Band Maintenance Series MY1C
Replacing the Dust Seal Band, and the Seal Belt
Disassembly
Loosen the four set screws on both of the head covers.
Remove the belt clamps
Remove both head covers
Remove the two slide table end covers
Slowly pull out the dust seal band
Slide the table and piston assy. to one end of the
cylinder. Do not remove the table and piston, or it will need to be adjusted.
Pull out the seal belt
Assembly
Tighten the two remaining set screws to fix the dust seal band.
Cycle the cylinder’s table by hand to see if there is any slack. If slack is present the band needs to be replaced.
If the band is ok, then uniformly apply Lithium Soap based grease to the band. Cycle, and remove any excess grease.
Series MY1C

19. Seal Band Maintenance Series MY1C
Replacing the Dust Seal Band, and the Seal Belt
Installing the Seal Belt
Cut the new seal belt to the combined length of the cylinder + end caps + piston assy. (Remember, longer is better!)
Apply a layer of grease to the seal belt and fill it’s groove
Slide the seal belt into the cylinder tube extrusion through the belt guide on the piston. Also, the extra belt length should project equally from both sides.
Move the slide table and piston to the opposite end of the cylinder tube. This should seat the seal belt into the tube extrusions groove.
Remove excess grease.
Belt Guide
Series MY1C

20. Seal Band Maintenance Series MY1C
Replacing the Dust Seal Band, and the Seal Belt
Installing the Dust Seal Belt
Cut the new seal belt to the combined length of the cylinder + end caps + piston assy.
Insert the new dust seal band (metallic side up) over the seal belt, and between the piston and table assy.
Insert the dust seal band in the recess in the tube with light finger pressure across the entire length of the cylinder tube.
Cycle the cylinder’s slide table by hand three or four times, and return the table to the end were the dust seal band is not fixed. During the last stroke slide your thumb across the dust seal band to remove any slack.
Cut the excess dust seal band leaving 10~15mm passed the two set screws in the end cover
Uniformly apply Lithium Soap based grease to the band.
Series MY1C

21. Seal Band Maintenance Series MY1C Hint: Trim the rubber backing
Replacing the Dust Seal Band, and the Seal Belt
Hint:
Trim the rubber backing
10 ~ 15mm so the band will fit underneath the set screws
Caution!:
Just trim one side to begin with!
Series MY1C

22. Seal Band Maintenance Series MY1C
Replacing the Dust Seal Band, and the Seal Belt
Install the side table’s end cover(s) so there is a 1mm clearance between the cover(s) and the dust seal belt
Series MY1C

23. Seal Band Maintenance Series MY1C
Replacing the Dust Seal Band, and the Seal Belt
Insert the seal belt and dust seal band into the head cover in corresponding locations
Install the head covers into the tube extrusion with a slight rocking motion.
Thread the socket head cap screws into the head cover by hand. Do not tighten yet.
Place the cylinder on a flat plate and align the head covers. tighten the socket head cap screws.
Trim any excess seal belt and dust seal band.
Place the belt clamp into the slot in the head cover.
Tighten the four set screws on one side of the cylinder.
Cycle the cylinder’s slide table by hand 3 or 4 times, and
return the table to the end were the dust seal band is not fixed. During the last stroke slide your thumb across the dust seal band to remove any slack.
Install the belt clamp, and tighten the 4 set screws on the other side of the cylinder.
Series MY1C

24. Seal Replacement Series MY1C
Important! When replacing the piston and cushions seals do not remove the piston from the cylinder tube. Also do not move the table past the cam follower rails. Failure to follow these direction will result in the table needing to be readjusted.
To replace the tube seal, remove the end cap and insert a new seal. Reassemble following the same instructions for dust seal replacement.
Seal goes
here
Seals go
here
To replace the piston and cushion seals, remove both end caps, and side the piston to each end of the cylinder. This will allow access to the seals without removing the piston and table from the cylinder. Reassemble following the same
instructions for dust seal replacement.
Series MY1C

25. Slide Table Adjustment
Adjusting the slide table is a “non-standard” procedure, and should not need to be done.
However, information is available in the MY1C Operations Manual to perform this adjustment.
CAMS
Adjusting Gear
(Slotted)
Set Screw
(Hex Head)
Series MY1C

26. Series MY1C