Efficient Plant April 2018 - 31

power transmission

Make sure your drive roller chains are neither too loose nor too tight.
Information in this chart courtesy of Diamond Chain

Recommended Possible Mid-Span Movement AC
Drive
center
line

Tangent length between sockets
5 in.

10 in.

15 in.

20 in.

30 in.

40 in.

60 in.

80 in.

100 in.

Horizontal
to 45 deg.

0.25 in.

0.5 in.

0.75 in.

1 in.

1.5 in.

2 in.

3 in.

4 in.

5 in.

Vertical to
45 deg.

0.12 in.

0.25 in.

0.38 in.

0.5 in.

0.75 in.

1 in.

1.5 in

2 in.

2.5 in.

Taut span

AC = total possible mid-span movement
Depth of free sag = 0.866 AB approximately

+

THUMB: TENSION

+

FOREFINGER: SAFETY

+

Give Your
Chain A 'Hand'
WHILE DRIVE ROLLER chain may be a mature form of mechanical-power transmission, it's still well-suited to many applications. Among
other things, roller chain is economical; resistant to shock loads; easy to
install; relatively efficient; available in a variety of shapes, forms, and materials; and capable of operating successfully in hostile environments. It also
can be used for conveyance.
A drive-chain system consists of the chain, sprockets (at least one pair),
guards, and some form of lubrication. According to Richard Knotek of
Motion Industries, Birmingham, AL (motionindustries.com), it's imperative that these systems be installed and maintained properly to deliver safe
operation and maximum service life. Using the five fingers of the human
hand as a mnemonic, he offered the following reminders.
- Jane Alexander, Managing Editor

Richard R. Knotek is a technical-training specialist with the Motion Institute,
a division of Motion Industries (MotionIndustries.com). Learn more about
extending roller-chain life through the company's "MiHow2" videos at
https://tinyurl.com/y9vn4pk7.

APRIL 2018

+

Drive roller chain has a recommended total mid-span movement of
0.5 in./10 in. of shaft-center-line distance, for horizontal applications, and half of that for vertical orientation (see chart). If a chain
is too loose, it will jump. If it's too tight, bearing loads increase
dramatically, leading to failure

First and foremost, the system must be electrically locked-out,
tagged-out, verified, and mechanically load-leveled prior to performing work on it. Avoid pinch points. Use proper guards.

MIDDLE FINGER: CHAIN AND
SPROCKET CONDITION
"Stretch" is actually caused by the wearing away of chain components. Maximum recommended stretch should not exceed 3% of
original installed length. Half links are weak links. Worn chain will
jump, whip about, and accelerate sprocket wear. Sprocket teeth
should not look like shark fins or be worn to the nub. These conditions contribute to system vibration, leading to rapid failure. Clean
chain and sprockets last longer.

RING FINGER: LUBRICATION

Since drive roller chain is essentially a series of interconnected
bearings revolving around an axis, it requires lubrication. (Note:
polymer types do not.) Featuring additives for sliding friction,
roller-chain lubricants are formulated to prevent centrifugal forces
from flinging the lubricant off the chain. There are three major
categories.
 Manual or drip: Oil is applied periodically with a brush, spout, or
dripped on chain.
 Bath: Oil covers the lowest portion of a chain enclosed in a leakproof guard.
 Circulating stream: In this type of closed system (similar to the bath
system above), oil is sprayed on to chain, circulated, and filtered.

+

LITTLE FINGER: ALIGNMENT
Sprocket shafts should be parallel. The offset of sprocket faces
should be < 0.0625 in./ft. of shaft-center-line distance. Angularity
should be < 0.5 deg. Axial run-out (wobble) of sprockets should be
< 0.001 in./in. of sprocket diameter (see chart). EP
EFFICIENTPLANTMAG.COM |

31


http://www.motionindustries.com http://www.MotionIndustries.com https://www.tinyurl.com/y9vn4pk7 http://www.EFFICIENTPLANTMAG.COM

Table of Contents for the Digital Edition of Efficient Plant April 2018

Editorial
Implementations
What's Wrong With My Bolts?
Understand Vertical Motor Bearings
Bourbon Boom Drives Distillery Expansion
Lubricant Myths That Can Cost You
IIoT
SAP: When To Update SAP Master Data
Give Your Chain A 'Hand'
Why Do Hackers Hack?
Why Compressor Size Matters
Equipment-Rental Considerations
On The Floor
Microgrids Are On The Rise
Solution Focus
Products
Index
Showcase
Seeking Reliability
Efficient Plant April 2018 - Cover1
Efficient Plant April 2018 - Cover2
Efficient Plant April 2018 - 1
Efficient Plant April 2018 - 2
Efficient Plant April 2018 - 3
Efficient Plant April 2018 - 4
Efficient Plant April 2018 - 5
Efficient Plant April 2018 - Editorial
Efficient Plant April 2018 - 7
Efficient Plant April 2018 - Implementations
Efficient Plant April 2018 - 9
Efficient Plant April 2018 - What's Wrong With My Bolts?
Efficient Plant April 2018 - 11
Efficient Plant April 2018 - 12
Efficient Plant April 2018 - 13
Efficient Plant April 2018 - 14
Efficient Plant April 2018 - 15
Efficient Plant April 2018 - Understand Vertical Motor Bearings
Efficient Plant April 2018 - 19
Efficient Plant April 2018 - 20
Efficient Plant April 2018 - Bourbon Boom Drives Distillery Expansion
Efficient Plant April 2018 - 22
Efficient Plant April 2018 - 17
Efficient Plant April 2018 - 18
Efficient Plant April 2018 - 19
Efficient Plant April 2018 - 20
Efficient Plant April 2018 - Bourbon Boom Drives Distillery Expansion
Efficient Plant April 2018 - 22
Efficient Plant April 2018 - 23
Efficient Plant April 2018 - 24
Efficient Plant April 2018 - Lubricant Myths That Can Cost You
Efficient Plant April 2018 - 26
Efficient Plant April 2018 - 27
Efficient Plant April 2018 - 28
Efficient Plant April 2018 - IIoT
Efficient Plant April 2018 - SAP: When To Update SAP Master Data
Efficient Plant April 2018 - Give Your Chain A 'Hand'
Efficient Plant April 2018 - Why Do Hackers Hack?
Efficient Plant April 2018 - Why Compressor Size Matters
Efficient Plant April 2018 - Equipment-Rental Considerations
Efficient Plant April 2018 - On The Floor
Efficient Plant April 2018 - 36
Efficient Plant April 2018 - Solution Focus
Efficient Plant April 2018 - 38
Efficient Plant April 2018 - 39
Efficient Plant April 2018 - 40
Efficient Plant April 2018 - Products
Efficient Plant April 2018 - 42
Efficient Plant April 2018 - 43
Efficient Plant April 2018 - 44
Efficient Plant April 2018 - 45
Efficient Plant April 2018 - Index
Efficient Plant April 2018 - Showcase
Efficient Plant April 2018 - Seeking Reliability
Efficient Plant April 2018 - Cover3
Efficient Plant April 2018 - Cover4
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