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Rod-Style
Actuators
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Rodless
Cylinders
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Larger footprint: for a typical NFPA tie
rod cylinder, 2" bore x 8" stroke, OAL when rod
is extended is 21.75 in. (appr.)
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The equivalent 2" bore x 8" stroke
Tol-O-Matic rodless cylinder (BC220 series) is 14.3 in.
Since the cylinder stroke is contained within the cylinder
itself, there is a 34% smaller footprint! (Space savings
varies with style and stoke selection.)
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Minimal
load support, especially when approaching end of stroke.
The bending moment can cause seal and bearing wear and load
deflection. (See the nervous fish.)
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Load
is supported throughout the entire stroke length. Using
Tol-O-Matic’s sizing and selection software, My, Mx,
and Mz are calculated and used to select the best rodless
cylinder for the application. (See happy fish.)
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| Unequal
piston areas; annular area effects force output, which is
not equal in both directions. Example: 2" bore rod-style
cylinder with 5/8" rod diameter exerts a theoretical
314.2 lbs of force extending, and 283.5 lbs retracting using
100 PSI—a 9.8% reduction. This effect is exaggerated
with larger rod diameters: a 1" rod diameter on this
2" bore cylinder only exerts 236 lbs when retracting—a
25% reduction in force! |
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Rodless
cylinders have equal piston areas in both directions. There
is no need to size the cylinder up to accommodate load variation
in either direction. Machine design is optimized. |
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Rod
rotation is a possibility, creating potentially unstable
load control. (Now the fish are VERY nervous!)
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Depending
upon the product series selected, the load is generously supported
through the stroke length with no possibility of rod rotation.
(Happy, happy fish!) |
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| Same-old/same-old
application with rod-style cylinders. |
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New
and exciting (space saving and weight saving) possibilities
with rodless cylinders! |
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| Fish
keep a wary eye on the process. |
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All
fish accounted for; 100% efficiency achieved. |
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