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Maska supply lock washers, grade 5 bolts and keys for shallow keyway bushings. ... 2 set screws: one over the keyway holding the key and one at 90 degrees to ... – PowerPoint PPT presentation

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Title: Prsentation PowerPoint


1
(No Transcript)
2
Baldors Mission Statement
is to be the best
(as determined by our customers)
marketers, designers and manufacturers of
industrial electric motors, mechanical power
transmission products, drives, and generators.
MASKA 2009-M1
3
Maska Training Belt Drive Systems
  • 1- Fundamentals
  • 2- V-belt Pulleys Maska characteristics
  • 3- Limits of Design
  • 4- Drive Optimization Tips
  • 5- Synchronous Drives
  • 1- Fundamentals
  • 2- V-belt Pulleys Maska characteristics
  • 3- Limits of Design
  • 4- Drive Optimization Tips
  • 5- Synchronous Drives

MASKA 2009-M1
4
1. Fundamentals Industry standards for V-belt
drives
  • All standards for V-belt drives are set by two
    Organizations
  • All of the Maska products meet these standards
    and some offer higher specifications i.e. like
    our QD bushings series in ductile iron.

MASKA 2009-M1
5
Maska - Interchangeability
  • Maska meets MPTA standards
  • Maskas QD sheaves and bushings are
    interchangeable with QD products made by all
    other manufacturer members of the MPTA.
  • All fixed bore sheaves from Maska have a
    reference number stamped on parts or printed on
    boxes to match manufacturer nomenclature

MASKA 2009-M1
6
1. Fundamentals Advantages of a Belt Drive
System
  • Easy and economical installation.
  • No lubrication required.
  • Clean low maintenance.
  • Elasticity of belts helps shock load dampening.
  • Quiet, smooth operation.
  • Long life expectancy when well designed.
  • Good mechanical efficiency.

MASKA 2009-M1
7
1. Fundamentals Important Facts about V-Belt
systems
  • Ability to slip upon overload, resulting in a
    fail-safe drive.
  • Generally 5 slippage.
  • A belt drive system should never be lubricated as
    it depends on friction to transmit power, in
    contrast with chain or gear systems.

MASKA 2009-M1
8
1. Fundamentals Safety Factor
  • The minimum safety factor should be based on
    industry standards.
  • Environment and working conditions will affect
    the safety factor.

MASKA 2009-M1
9
1. Fundamentals Safety Factors
MASKA 2009-M1
10
1. Fundamentals Speed Ratio outside
diameters
MASKA 2009-M1
11
1. Fundamentals Datum diameter v.s. Pitch
diameter
MASKA 2009-M1
12
Sheaves Maska characteristics
MASKA 2009-M1
13
BUSHINGS
14
2. Sheaves Maska characteristics Bushing
Features
  • QD and ST ¾ in. per foot or a 1.79 degree taper
    angle
  • TL 4 degrees
  • A smaller angle allows for a better shaft
    grip/fit/squeeze

MASKA 2009-M1
15
2. Sheaves Maska characteristics QD
bushings
  • Ductile iron a unique feature to Maska QD
    bushings for all bore sizes from JA to M
  • Set screw over the key for all sizes up to P.

MASKA 2009-M1
16
2. Sheaves Maska characteristics QD
compared with Taper-lock and ST
  • TL does not have a flange (flush mount)
  • QD takes up more room because of the flange, but
    allows reverse mounting.
  • ST is flanged but does not allow for reverse
    mounting.

MASKA 2009-M1
17
2. Sheaves Maska characteristics Maska QD
bushings
  • All of Maska QD bushings up to W come with a bolt
    hole pattern for standard and reverse mounting.
  • Maska supply lock washers, grade 5 bolts and keys
    for shallow keyway bushings.

MASKA 2009-M1
18
2. Sheaves Maska characteristics QD
bushings Installation features
  • 2 ways to mount bushings and pulleys on shaft
    standard and reverse. This allows sheaves to be
    mounted from the most convenient side to reduce
    overhang load.

STANDARD
REVERSE
MASKA 2009-M1
19
2. Sheaves Maska characteristics QD
bushings suitable for V-belt drives
  • The assembly of TL and ST bushings will resist
    heavy impacts with sprockets or 300 HTD drives
    because of their dual locking device on shaft and
    hub
  • QD bushing V-Belt Drives offer the necessary
    torque resistance when properly designed and are
    a preferred option because of their lower cost
    and easy installation removal.

MASKA 2009-M1
20
Taper-Lock Split taper v.s. QD
  • QD and TL both have full split
  • ST Double split in Taper only (partial split)
  • Therefore, the full split allows for a better
    shaft grip or fit (360º contact)

MASKA 2009-M1
21
Sheaves
22
2. Sheaves Maska characteristics Sheaves
material comparison
  • Cast Iron machined with precision and tight
    tolerances, resulting in improved efficiency and
    a long life expectancy
  • Plastic tolerances are close, but offers poor
    resistance to wear heat and is static
    generating
  • Die Cast variable tolerances depending on
    manufacturers. Low wear resistance and some
    manufacturers leave the burr made by the
    parting line in the groove reducing belt life
  • Pressed Steel poor tolerances, high wobbling
    and can only transmit low H.P.

MASKA 2009-M1
23
2. Sheaves Maska characteristics Sheaves
HP capacity
  • Cast iron (wider range of H.P.)
    3L-4L-5L-A-AX-B-BX-C-D-3V-5V-8V
  • Plastic 3L-4L-A (low H.P. rating)
  • Die Cast 4L and 5L (low H.P. rating)
  • Pressed steel 4L-5L-A-B (low H.P. rating)

MASKA 2009-M1
24
2. Sheaves Maska characteristics Sheaves
constructions
  • 3 different designs block (B), webbed (W) and
    arm (A) depending on pulley sizes.

MASKA 2009-M1
25
Maska MA MB characteristics
  • Bore tolerances designed for quick installation
    and good concentricity
  • Appropriate groove angles per size for a longer
    belt life
  • Vinyl primer or powder coating paint for a good
    corrosion resistance
  • Good quality at a competitive price, as per Maska
    philosophy

MASKA 2009-M1
26
MA MB Secure Mounting
  • Secure mounting onto shaft with 2 set screws one
    over the keyway holding the key and one at 90
    degrees to maintain the pulley in place on the
    shaft.
  • Set screws have a knurled cup point that ensures
    an efficient grip compared to standard round or
    cup point.
  • Recommended torque chart in the catalog

MASKA 2009-M1
27
MFAL Characteristics
  • Recommended F.H.P. (Fractional-Horse-Power)
    applications
  • Lighter than the MA series ensures a lower energy
    consumption at a lower cost for F.H.P.
    applications
  • A lighter hub made with a hump for the set screw
  • Smaller arms
  • Thinner groove walls

MASKA 2009-M1
28
MFAL Characteristics
  • This family was designed for the HVAC market and
    to be used with MVL.
  • Combined with the adjustable sheave MVL, there is
    no need for as many different diameters, as with
    the other sheaves families to cover the same
    speed ratios.

MASKA 2009-M1
29
MFAL Characteristics
  • The MFAL series has the same characteristics than
    the Fixed Bore series MA, but with some
    differences
  • One set-screw over keyway
  • Lighter design (F.H.P)
  • Special Groove (should not be used with 3L nor
    AX belt) also for a lighter design.
  • Smaller range of pulley diameters

MASKA 2009-M1
30
Maska - Adjustable Pitch Sheaves
Maska offers 4 types of adjustable pulleys
  • MVL light duty (HVAC) single groove diameters
    1.6 to 4.7 inches and suitable up to 5 H.P.
  • 8000 series single and double groove medium
    duty diameters ranging from 2.3 to 7.3 inches and
    suitable up to 25 H.P
  • VP series single and double groove medium duty
    diameters ranging from 1.6 to 7.4 inches and
    suitable up to 25 H.P.
  • MVS 2 grooves heavy duty up to 40 H.P.
    diameters 3.4 to 9.0 inches

MASKA 2009-M1
31
Maska - Adjustable pitch sheaves
  • All of Maska adjustable pulleys are made of cast
    iron offering the best quality.
  • Close tolerances of the threads on hubs are
    controlled for run-out
  • In double groove series, when flanges are backed
    off an equal number of turns, the gap is
    identical on both sides making both belts pull
    equally.

MASKA 2009-M1
32
2. V-belt pulleys Maska characteristics8000
VP series
  • The VP series is equivalent to 8000 series. The
    8000 series generally offers a wider range of
    speed.
  • Designed for A (4L), B (5L) and 5V belts.
  • Offers half turn adjustment up to 6 turns.
  • All made of gray cast iron

MASKA 2009-M1
33
2. Sheaves Maska characteristicsVariable
pulley adjustment
  • Should be selected from the mid pitch diameter.
  • Two groove pulleys are machined precisely to have
    the same pitch on both sides.

MASKA 2009-M1
34
MASKA BELTS
35
V-Belt construction
MASKA BLUEFLEX V-BELT
MASKA 2009-M1
36
2. Sheaves Maska characteristics Classical
V-belt
  • Used for heavy-duty and also light duty (Belts A
    B).
  • Large selection of cross-sections available.
  • Coupled with other identical cross-sections,
    these belts can transmit up to hundreds of hp
    units.

MASKA 2009-M1
37
2. Sheaves Maska characteristics Narrow
V-belt
  • Recommended for drive systems that require
    compact design, with higher speed and increased
    horsepower.
  • Drive system can be designed with shorter centers
    and smaller sheaves. Overall drive dimensions
    can be reduced by as much as 40.
  • 3V covers AB, 5V covers BC and 8V covers DE
    cross-sections.

MASKA 2009-M1
38
2. Sheaves Maska characteristics Cogged
V-belt
  • Belt flexibility increased and a larger surface
    contact for heat dissipation.
  • Better torque capacity even in high-speed
    operations.
  • Less slippage.

MASKA 2009-M1
39
2. Sheaves Maska characteristics Banded
V-belt
  • Recommended for applications with
    vertically-mounted shafts or extended
    center-to-center distances.
  • Assures lateral rigidity and guides the belts
    into the pulley walls in a straight line.
  • Designed for heavy-duty drives where shock
    loading is a problem and where multiple matched
    single belts tend to roll over or jump off the
    groove.

MASKA 2009-M1
40
3. Limits of design What limits?
STOP
MASKA 2009-M1
41
3. Limits of design SPEED LIMITATIONS
  • V-Belt drives are not recommended to run above
    9,000 ft/min or below 1,500 ft/min

MASKA 2009-M1
42
3. Limits of design Maximum minimum center
distance
  • Minimum diameter of the largest sheave.
  • Maximum 3 times the sum of both sheaves or 5
    times the largest sheave.

MASKA 2009-M1
43
3. Limits of design Maximum ratio
  • 16 is known to be the maximum recommended ratio
    for a V-belt drive.
  • Higher ratios like 17 can be obtained with
    cogged and small section belts (3VX).

MASKA 2009-M1
44
3. Limits of design Normal belt sheave life
  • 5,000 to 7,000 hours for belts
  • 25,000 hours for sheaves
  • Belts are generally replaced 4 times before
    replacing sheaves (generally driven pulleys)

MASKA 2009-M1
45
4. Drive optimization tips Designing new
drives
Criteria to optimize
  • Design horsepower / Safety factor
  • Center distance long and short center distance
    must be avoided.
  • Reducing Costs
  • Select reasonable parameters for a V-belt drive
    (ratio, speeds and HP)
  • Section belt selections

MASKA 2009-M1
46
4. Drive optimization tips Efficient speed
for a V-belt drive
  • OPERATION SPEEDS FOR V-BELT DRIVES
  • Ideal speed 4500 ft/min
  • Normal range 1500 6500 ft/min

MASKA 2009-M1
47
4. Drive optimization tips Reducing hub loads
  • Nema standards for minimum pulley diameter
  • Optimized safety factor (Bearings are not
    overcharged)
  • Standard mounting assembly
  • Proper belt tension
  • Select the next size pulley that will cut off one
    groove. Make a compromise with price.

MASKA 2009-M1
48
4. Drive optimization tips Arc of contact
  • For efficient operations, the minimum belt wrap,
    or arc of contact, of the smallest pulley should
    be 120 degrees.
  • The maximum arc of contact that can be obtained
    is 180 degrees. For larger ratios, an idler
    pulley may be necessary.

MASKA 2009-M1
49
4. Drive optimization tips Service factor
for speed-up
  • Increases by 20 the service factor
  • Slippage and higher torque demands on starting
    operations. Smaller pulley is on the load side.

MASKA 2009-M1
50
4. Drive optimization tips RMA minimum
recommended diameter
MASKA 2009-M1
51
4. Drive optimization tips Installation
Procedures
  • Clean all surfaces (grooves, taper hub, shafts,
    etc.)
  • Verify alignment
  • Proper Belt tension
  • Check tension after 48 hours

MASKA 2009-M1
52
4. Drive optimization tips Belt tensioning
 
 
  • Too much tension can cause excessive wear on
    belts bearings.
  • Too little tension allows slippage, loss of power
    additional wear.

 

MASKA 2009-M1
53
4. Drive Optimization Tips Checking Sheave
Grooves for wear
  • Worn grooves cause one or more belts to ride
    lower than the others, resulting in premature
    wear of belts reduced performance levels (see
    Figure below)
  • If wear is premature, could be caused by
    misalignment.
  • Signs of wear
  • One or more belts are slack while others are
    tight?
  • Bottom of the groove is shiny?
  • Belts wear out quickly?

MASKA 2009-M1
54
4. Drive Optimization Tips Checking Sheave
Grooves for wear
  • How to check for wear quickly?
  • Maska sheave belt gage is an inexpensive tool
    that can be inserted in the groove until the rim
    touches the flange. If more than 1/32" wear,
    replace the sheave (see Figure below).
  • The cost of replacing the part is soon offset by
    the number of belts that will be quickly ruined
    by rounded sidewalls.
  • Resulting belt problems touching bottom and
    slipping, reduced wedging action less gripping
    power.

MASKA 2009-M1
55
4. Drive optimization tips Special
Environments
  • Maska blueflex belts have ORS construction
  • Heat resistance
  • Oil Resistance
  • Static conducting
  • For hazardous environments, additional protection
    is recommended such as grounding the entire
    system to ensure against accidental static spark
    discharges
  • Cogged belts at higher temperature or linked
    belts between 140 180 for smaller drives.

MASKA 2009-M1
56
SYNCHRONOUS BELT DRIVES
MASKA 2009-M1
57
5.1 What is a Synchronous Drive?
  • Used when indexing, positioning or a constant
    speed ratio is required.
  • Drive that runs without slippage (positive drive)
  • THREE CATEGORIES OF SYNCHRONOUS DRIVES

MASKA 2009-M1
58
5.2 Advantages of a Synchronous Belt
Drive
  • No lubrication required
  • Clean low maintenance
  • Low-stretch tensile cord nearly eliminating the
    need for re-tensioning
  • Eliminate noise problems of chain drives
  • Long life expectancy when well designed
  • Smooth engagement of belt with pulley allows high
    speeds
  • Less weight compared to chain and gear drives for
    same horsepower requirements
  • Can operate in wet environments

MASKA 2009-M1
59
5.3 Synchronous belt drive applications
AUTOMATIC MACHINERY
MASKA 2009-M1
60
5.4 Synchronous Belt Drive Applications
  • FOOD PROCESSING
  • Bottling machines, pumps, bucket elevators, belt
    conveyors, mixers, mills, meat grinders
  • PETROCHEMICAL INDUSTRIES
  • Air coolers, dryers, compressors, pumps

MASKA 2009-M1
61
5.5 Synchronous belts
MASKA 2009-M1
62
5.5.1 Timing Belt v.s. H.T.B.
  • Optimizing tooth profile - H.T.B. design
  • Better load transfer to tensile members
  • Closer tooth spacing for more power transmitted
  • Minimize strains in corner and bond surface

MASKA 2009-M1
63
5.5.3 Belt size designation
  • Standard/Trapezoidal Synchronous Belt

MASKA 2009-M1
64
5.5.5 Belt size designation
  • MASKA BLUE FLEX DESIGNATION

TB TIMING BELT
MASKA 2009-M1
65
5.5.6 Belt size designation
  • H.T.B. / Curvilinear Synchronous Belt

560 (mm) ------ 8M ------ 30 (mm) Pitch
length Tooth pitch Belt Width
2800 (mm) ------ 14M ------ 55 (mm) Pitch
length Tooth pitch Belt Width
MASKA 2009-M1
66
5.5.7 Belt size designation
  • MASKA BLUE FLEX DESIGNATION

HTB HIGH TORQUE BELT
MASKA 2009-M1
67
5.5.8 Synchronous belts manufacturers
MASKA 2009-M1
68
5.6 Synchronous belt pulleys
MASKA 2009-M1
69
5.7 Synchronous Belt Pulleys
  • Sheaves come in several forms, being either block
    (B), webbed (W) or arm design (A), depending on
    the outside diameter.

Arm
Webbed
Block
MASKA 2009-M1
70
Selection of Flanged Pulleys
  • On synchronous drives, the minimum flanging
    requirement are two flanges on the smaller pulley
    or one flange on each pulley at the opposite
    side.
  • When the center distance is more than 8 times the
    diameter of the small pulley, both pulleys should
    be flanged.
  • On every vertical shaft drive, one pulley should
    be flanged on both sides and the other pulley
    should be flanged on the bottom side.
  • For multiple drive applications, any other
    additional pulley than the two existing should
    have two flanges or at least one flange on the
    opposite side.

MASKA 2009-M1
71
Timing Pulley - Part designation
P16H150-1108 P PULLEY
MASKA 2009-M1
72
H.T.D. Sprockets - Part designation
P24-8M-30-JA P PULLEY
MASKA 2009-M1
73
5.8 Synchronous Drive (Pulleys)
  • The smaller pulley must have at least six teeth
    in mesh with the belt to respect standard HP
    rating.
  • The belt width should not exceed the pulley
    diameter.
  • 6500 feet per minute max. rim speed.

MASKA 2009-M1
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