instruction manual - tsubakimoto

TSUBAKI Timing Belts & Pulleys

Instruction Manual

TSUBAKIMOTO CAHIN CO.

- - - 2 -

Timing Belts & Pulleys Safety Use In order to ensure correct handling of the products, please make sure to read the belt catalog and

instructions thoroughly upon use paying close attention to the items below, which have been classified

according to the degree of influence on safety.

Definition

Terms

Danger When it is assumed the death or serious personal injury is imminent as a result of

incorrect handling.

Warning When it is assumed that death or serious personal injury is possible as a result of

incorrect handling.

Caution When it is assumed that there is a risk of personal injury and /or material damage as a

result of incorrect handling.

Applications and Objectives of Use

Danger When it is foreseen that idling and equipment stoppage caused by cutting of the belt will lead to an

accident resulting in death or serious personal injury, make sure to install a safety device.

Danger Do not use the belt as a harness or tow rope.

Warning When it is foreseen that static electricity generated by operation of the belt may lead to the mistaken

use of a fire extinguisher, please install a static electricity prevention device in the equipment.

Caution Do not use the belt as an insulator. Since insulating properties vary depending on the type of belt,

please consult TSUBAKI.

Caution When the belt comes into direct contact with food, make sure to use a belt which complies with the Food

Sanitation Law.

Caution Do not carry out additional procession got in the belt. Quality and performance of the belt is likely to

deteriorate as a result.

Function and Performance

Caution Do not use the belt in any way other than indicated in each belt catalog, design data, etc. or outside the

tolerance levels. Premature breakage of the belt may occur.

Caution Adhesion of water , oil, chemicals, paint, dust, etc. to the pulley or belt will result in deterioration of

transmission power and possibly cause premature breakage.

Caution Noise may become large during high-speed operation of the belt. In this case please install a sound

insulation cover.

Storage and Transportation

Caution When transporting or handling heavy belts and pulleys, make sure to use transportation

equipments/apparatuses, etc. suitable for weight involved.

Caution Do not forcefully bend or place heavy items on the belt during transportation or storage, as this will

result in creasing/damage and cause premature breakage of the belt.

Caution Keep the belt stored at a temperature range of –10℃ to +40℃ in a low humidity place.

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Installation and Mobility

Danger Make sure to install a safety cover over all rotating parts including the belt and pulley. There is a

possibility of hair, gloves, clothes, etc. getting caught in the belt and pulley. Moreover, breakage of the

belt or pulley may cause an injury from flying fragments.

Danger Abide by the following during maintenance, inspection or replacement of the belt and pulley.

(1) Make sure to disconnect the power and wait for the belt and pulley to stop completely before

starting.

(2) Where there is a possibility of the machine starting from removal of the belt. Secure the machine in

advance before staring work

(3) Ensure that the power can not be switched on accidentally.

Caution When replacing belt or pulley, ensure that the same type is used. Replacement with a different type

may lead to premature breakage.

Caution Deviation in the pulley alignment will cause premature breakage or flange omission. Please carry out

adjustments as required.

Caution Loosen the belt tension when replacing it. Do not force the belt over the flange of the pulley by using a

screwdriver or similar implement, as this will cause premature breakage of the belt and shaft.

Caution When installing the belt, make sure to use proper tension as indicated in the catalog and design data.

Improve tension may result in premature breakage of the belt and shaft.

Caution Carry out the following when additional processing on the pulley is required before use:

・Remove burrs and sharp corners;

・Check precision of dimension after processing;

・Check strength of pulley after processing;

Caution When attaching the flange to the pulley, make sure no foreign particles exist between the pulley and

flange, and secure them to prevent ratting in the flange by calking. Unsuitable fitting will cause the

flange to come off.

Inspection

Caution Carry out regular inspections of the belt and pulley, and replace them when you notice anything out of

the ordinary.

Handling of Used Items

Caution Do not burn the belt. Harmful gasses may be generated.

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- - - 4 -

Contents

Timing belt safety use----------------------------------------------------------------------------2

Structure---------------------------------------------------------------------------------------------5

Layout design---------------------------------------------------------------------------------------6

Mounting----------------------------------------------------------------------------------------------9

Periodic Inspection Procedure-----------------------------------------------------------------12

Trouble shooting-----------------------------------------------------------------------------------13

ULTRA PX belt HC Type (UP8M/14M)

PX belt

- - - 5 -

Structure

Backing : Durable and wear-resistant rubber

Cord : Fiberglas with very minimal growth

Tooth rubber : Same material as the backing to realize high-power drive.

Fabric : Nylon with superior wear-resistance

Backing Fabric

Tooth rubber

Cord

- - - 6 -

Timing belt has the property of deviating towards the axial direction of pulley during operation. Accordingly, mount the

guide-flange on the pulley to prevent the belt from coming off the pulley. Setting standards for guide-flange are as follows.

■Horizontal biaxial transmission

Mount two guide flanges on both sides of one of the two pulleys, or one each on opposite sides of both pulleys.(EX1)

When the distance between centers of pulley is over eight times longer than outside diameter (do) of the small pulley,

mount the flange on both sides of both pulley.(EX2)

■Transmission of vertical axis

The belt is liable to be disengaged to the lower side by empty weight. Mount the guide flange on the lower side of one

pulley and on both sides of the other pulley.

■Multi-axial transmission

Mount the guide flange on both sides（EX1）at every other side of pulley or on one side of whole pulley(EX2).

■Use of idler

The idler is used in the following cases.

・When adjusting the mounting tension by fixing the bearing.

・when speed ratio is great and small pulley has numerous number of teeth.

・When belt guide is impossible by driving and driven pulley.

■Cautions when using idler

・The idler should be of fixed type. Be sure to use it on the slag side.

・Pay attention to the fact that the belt may be disengaged from the pulley if the degree of parallelization of

the axial core between idler and both axes becomes defective.

・The idler diameter should be decided by following.

＊Inside idler・・・Pulley with teeth exceeding the minimum number.

＊Outside idler・・・Flat pulley without crown with 1.2 times the pitch-circle diameter or more of smallest pulley.

Layout design

Mounting of guide flange

Use of idler

Center distance ≥do×8

（EX1）（EX2）

（EX1） (EX2)

do

- - - 7 -

■Minimum number of pulley teeth (Rubber belt)

・PX / ULTRA PX-HC

Speed r/min

TYPE ≧900

900<

≧1200

1200<

≧1800

1800<

≧3600

P2M

P3M ・・・・UP3M-HC



P14M・・・・UP14M-HC

16 14 18 24 28

16 14 20 26 28

18 16 24 26 28

20 18 28 28 34

・TRAPEZOIDAL

Speed r/min

TYPE ≧900

900<

≧1200

1200<

≧1800

1800<

≧3600

3600<

≧4200

※※※※MXL ※※※※XL ※※※※L ※※※※H

10 10 12 14

12 10 12 16

14 12 14 18

16 12 16 20

16 14 18 22

■Minimum number of pulley teeth (Urethane belt)

・LONG / FLEX / JOINT

TYPE Minimum number

of teeth Outside idler

mm TYPE

Minimum number of teeth

Outside idler mm

T5 T10 T20 AT5 AT10 AT20

12 14 15 14 15 18

30 60 120 60 100 120

RPP5 RPP8 RPP14

※※※※XL ※※※※L ※※※※H

12 18 28 10 12 14

60 100 120 30 60 80

・ENDLESS (MOLDING)

Speed r/min

TYPE ≧900

900<

≧1200

1200<

≧1800

1800<

≧3000

T2.5 T5 T10

※※※※MXL ※※※※XL ※※※※L

16 12 16 14 10 12

16 14 18 16 11 12

18 16 20 16 12 14

20 18 22 16 12 16

Inside Idler Outside Idler

※Date of JIS standard ‘’trapezoidal tooth belts’’ We are discontinued Product.(September 30, 2013)

- - - 8 -

In the transmission of only driving and pulleys, without using an idler, provide the adjusting margin (table below) of the

distance between axes at the bearing including the manufacturing length (tolerance) of belt.

■Adjusting margin of inter-axial distance for bi-axial transmission

・Without TRAPEZOIDAL BELT

TYPE

Belt length Belt pitch

Less than 5 mm Belt pitch

More than 8 mm

⊿Co

≧500

500～1000

1001～2000

2000≦

3 5 10 15

3 5 10 15

⊿Ci common 10 15

・TRAPEZOIDAL BELT

TYPE

Belt length ※※※※MXL ※※※※XL ※※※※L ※※※※H

⊿Co

≧200

201～ 390

391～ 800

801～1200

1201≦

3 5 10 15 22

3 5 10 15 25

3 5 10 15 25

3 5 10 15 25

⊿Ci common 5 5 10 15

Timing belt does not turn at pulley center even when pulley-alignment is exact, and it is liable to deviate on either side.

That force is very weak and when pulley alignment is poor, belt-side may be damaged. In extreme cases, it may run on

the guide flange and break. Accordingly, adjust the alignment of pulley within the allowable range listed below.

■Allowable degree of parallelization

Belt width mm ≧30 30～50 50～100 100≦

Allowable degree

of parallelization ≧5/1000 ≧4/1000 ≧3/1000 ≧2/1000

θ (min) ≧17 ≧13 ≧10 ≧6

■How to adjust of pulley

As shown in the diagram, apply the straight edge to the end face of the pulley which is to be standard. Make the other

pulley contact with straight edge on all faces (to make ε＝0). It is possible to take axial degree of parallelization

simultaneously.

Adjustment of distance between two axes

Alignment of pulley

Adjusting range to the inside

C

⊿Ci

⊿Co

θ

θ

ε δ

Do

Straight edge

Standard pulley

δ＝Do×allowable degree of parallelization

Adjusting range to the inside


- - - 9 -

■Mounting tension of belt

Timing belt transmission is an engagement transmission and proper tension is necessary for smooth transmission and

prevention of tooth overpass. Weak tension may cause engaging discordance while strong tension may cause noise.

Both situations shorten the service life.

■How to apply tension

1.Including the idler-axis, the degree of parallelization for all axes and alignment of pulley can be given exactly.

2.Pressing force (F) is applied to the center of the belt span.

3.The bending(δ) of the belt will produce tension of 1.6mm per 100mm span.

■How to obtain the pressing force(F)

Mounting

Mounting tension of belt

Ａ

Ｂ

Ｆ

ｔ

δ

Ｃ

φ

16

L

YtTi

F

×+

=

4

)( 22 dpDpct

−−=

Ｆ：necessary load for the bending(δ) at the center of span “t” Ｎ{kgf}

Ti：Mounting tension N{kgf}

Y：Correcting index (based on list below)

δ：Bending mm 0.016ｔ

ｔ：Span length mm

C：Distance between axes mm

Dp：Pitch-circle diameter of large pulley mm

dp：Pitch-circle diameter of small pulley mm

L：Belt length mm

- - - 10 -

■PX TYPE

TYPE Belt width

mm

Mounting tension Ti N{kgf} Correcting index Y recommended Maximum

P2M 4 6 10

5.9{ 0.6} 9.8{ 1.0}

17 { 1.7}

7.8{ 0.8} 13 { 1.3} 23 { 2.3}

0.6{ 0.06} 0.9{ 0.09} 1.6{ 0.16}

P3M・・・・P3M-W 6 10 15

20 { 2.0} 34 { 3.5} 55 { 5.6}

26 { 2.7} 46 { 4.7} 74 { 7.5}

1.1{ 0.11} 1.9{ 0.19} 3.0{ 0.31}

UP3M-HC 6 10 15

29 { 3.0} 54 { 5.5} 88 { 9.0}

40 { 4.1} 72 { 7.3}

118 { 12.0}

21.6{ 2.2 } 34.3{ 3.5 } 52.0{ 5.3 }

P5M・・・・P5M-W

UP5M-HC/HA

10 15 25

108 { 11.0} 167 { 17.0} 304 { 31.0}

147 { 15.0} 225 { 23.0} 412 { 42.0}

56.9{ 5.8 } 82.4{ 8.4 }

201 { 20.5 }

P8M・・・・P8M-W

15 25 40 60

225 { 23.0} 382 { 39.0} 657 { 67.0}

1040 { 106 }

294 { 30.0} 510 { 52.0} 860 { 88.0}

1370 { 140 }

135 { 13.8 } 239 { 24.4 } 419 { 42.8 } 628 { 64.1 }

UP8M-HC/HA

15 25 40 60

177 { 18.0} 304 { 31.0} 530 { 54.0} 834 { 85.0}

235 { 24.0} 408 { 41.6} 690 { 70.4}

1100 { 112 }

135 { 13.8 } 239 { 24.4 } 419 { 42.7 } 628 { 64.0 }

P14M

40 60 80 100 120

990 { 101 } 1500 { 153 } 2110 { 215 } 2710 { 276 } 3340 { 341 }

1310 { 134 } 2000 { 204 } 2810 { 286 } 3610 { 368 } 4450 { 454 }

502 { 51.2 } 837 { 85.4 }

1000 {102 } 1260 {128 } 1680 {171 }

UP14M-HC

40 60 80 100 120

794 { 81.0} 1200 { 122 } 1690 { 172 } 2170 { 221 } 2680 { 273 }

1050 { 107 } 1600 { 163 } 2250 { 229 } 2880 { 294 } 3560 { 363 }

502 { 51.2 } 837 { 85.3 }

1000 {102 } 1260 {128 } 1680 {171 }

■TRAPEZOIDAL

TYPE

Belt width mm

Mounting tension Ti N{kgf} Correcting index Y

Code mm recommended Maximum

※※※※MXL

3.2 4.8 6.4 9.5 12.7

3.2 4.8 6.4 9.5 12.7

2.06{ 0.21} 3.14{ 0.32} 4.12{ 0.42} 6.17{ 0.63} 8.23{ 0.84}

4.90{ 0.50} 8.33{ 0.85}

11.76{ 1.20} 18.13{ 1.85} 24.99{ 2.55}

4.22{ 0.43} 6.67{ 0.68} 9.32{ 0.95}

14.6 { 1.49} 20.4 { 2.08}

※※※※XL 025 031 037

6.4 7.9 9.5

13.7 { 1.4 } 19.6 { 2.0 } 24.5 { 2.5 }

29.4 { 3.0 } 37.2 { 3.8 } 44.1 { 4.5 }

11.8 { 1.20} 16.4 { 1.67} 22.0 { 2.24}

※※※※L 050 075 100

12.7 19.1 25.4

51.9 { 5.3 } 87.2 { 8.9 }

122.5 { 12.5 }

76.4 { 7.8 } 124.5 { 12.7 } 174.4 { 17.8 }

38.3 { 3.91} 65.2 { 6.65} 91.3 { 9.31}

※※※※H

075 100 150 200 300

19.1 25.4 38.1 50.8 76.2

221.5 { 22.6 } 311.6 { 31.8 } 486.1 { 49.6 } 667.4 { 68.1 }

1046.64{106.8 }

293.0 { 29.9 } 420.4 { 42.9 } 645.8 { 65.9 } 888.9 { 90.7 }

1390.6 {141.9 }

193 { 19.7 } 264 { 26.9 } 419 { 42.7 } 558 { 56.9 }

1004 {102.4 }

Mounting tension chart (rubber belt)


- - - 11 -

■LONG / FLEX / JOINT

Fa/2＜Ti≦Fa Ti：Mounting tension N{kgf} Fa：The maximum effective tension N{kgf}

■Correcting index chart (LONG/FLEX/JOINT)

TYPE Belt width

mm

Correcting index

Y

T5

10 15 20 25

39 76 110 123

T10

15 20 25 50 75

165 215 273 568 864

T20 25 50 75

426 960 1472

AT5

10 15 25 50

82 141 233 506

AT10 25 50 75

426 960 1472

AT20 50 75

1440 2061

■ENDLESS(MOLDING)

Ti：Mounting tension N｛kgf｝

2 φ ：Winding angle of small pulley °

Mounting tension chart (Urethane belt)

TYPE Belt width

mm

Correcting index

Y

RPP5

10 15 20 25 30 50 85 100 150

112 170 228 304 340 608 902 1048 1508

RPP8

10 15 20 30 50 85 100

187 270 387 573 909 1619 2022

RPP14

15 20 24 40 50 55 85 100 115 150

365 632 858 1574 2008 2144 3648 4288 4920 6528

TYPE Belt width

mm

Correcting index

Y

※※※※XL

6.4 7.9 9.5 12.7 19.1 25.4

24 29 39 54 86 116

※※※※L

9.5 12.7 19.1 25.4 38.1 50.8

78 105 169 230 356 481

※※※※H

12.7 19.1 25.4 38.1 50.8 76.2 101.6

105 169 230 356 481 732 983

TYPE

Belt width mm

Mounting tension Ti

N{kgf} Correcting index

Y Code mm recomme

nded Maximum

※※※※MXL 3.2 4.8 6.4

3.2 4.8 6.4

2.06{ 0.21}3.14{ 0.32}4.12{ 0.42}

4.90{ 0.50}8.33{ 0.85}

11.76{ 1.20}

0.20{ 0.02}0.39{ 0.04}0.59{ 0.06}

※※※※XL 025 031 037

6.4 7.9 9.5

13.7 { 1.4 }19.6 { 2.0 }24.5 { 2.5 }

29.4 { 3.0 }37.2 { 3.8 }44.1 { 4.5 }

3.82{ 0.39}5.39{ 0.55}7.55{ 0.77}

※※※※L 050 075 100

12.7 19.1 25.4

51.9 { 5.3 }87.2 { 8.9 }

122.5 { 12.5 }

76.4 { 7.8 }124.5 { 12.7 }174.4 { 17.8 }

44.1 { 4.5 }73.46{ 7.7 }

106.82{10.9 }

TYPE

Belt width mm

Mounting tension Ti

N{kgf} Correcting index

Y Recommen

ded Maximum

T2.5

3 5 7 10

1.96{ 0.20}3.04{ 0.31}4.51{ 0.46}6.47{ 0.66}

2.94{ 0.3 }4.90{ 0.5 }6.76{ 0.69}9.70{ 0.99}

0.20{ 0.02}0.39{ 0.04}0.88{ 0.09}1.08{ 0.11}

T5

5 10 15 20

9.8 { 1.0 }24.5 { 2.5 }

39.2 { 4.0 }56.8 { 5.8 }

14.7 { 1.5 }37.2 { 3.8 }58.8 { 6.0 }85.3 { 8.7 }

6.9 { 0.7 }16.7 { 1.7 }26.5 { 2.7 }38.2 { 3.9 }

T10 15 20 25

107.8 {11.0 }156.8 {16.0 }196.0 {20.0 }

161.7 {16.5 }235.2 {24.0 }294.0 {30.0 }

71.5 { 7.3 }104.9 {10.7 }130.3 {13.3 }

Axial load ＝２Ti×sin Ф

Axial load


- - - 12 -

■Tension adjusting

Check the initial tension and adjust the belt to the optimum tension. The timing belt initially elongates about

0.1% of the shaft-to-shaft length at the early stage of use, but thereafter the steady-state elongation is very

little. Therefore, by adjusting the initial tension after one month of use, the belt can be maintained in the

optimum condition.

■Visually check

Visually check the belt and if the following problem is found, review the adequacy of the belt, including

choosing the belt of other sizes. Also check the installation method and overload for any problem.

Problem Appearance

Abnormal wear of

mating flake

(Initial)

Facing fabric has been worn. → Replace.

Facing fabric has become fluffy and has looked

white and the texture of facing fabric has become unclear.

■Visually check

Visually check the belt and if the following problems are found, replace the belt.

Problem Appearance

Abnormal wear of

mating flake

Facing fabric has been worn and tooth

rubber is exposed.

(The tooth has become narrow.)

Crack on tooth root Crack

Missing tooth Cords is exposed

Abnormal wear

Note: Normal if side face appears

sharp as cut by a knife.

Edge rounded.

Abnormal wear

(Cords is frayed and exposed.)

Rupture on side

face.

Periodic Inspection Procedure

Periodic Inspection Procedure（After one month or after 100hour driving）

Biannually

- - - 13 -

Trouble phenomena Causes Measure

1.early severing of belt

(a)(c)

1.Overload

2.Shock load

3.Bending of belt

Check the inertia of subject-moved body, prime

motor and using conditions, etc.

2.tear off / wear of belt side.

(g)

1.Poor degree of parallelization

of axis

2.Defective pulley arrangement.

3.lack of rigidity of the framework.

4.bent flange

Correct the degree

poor of parallelization.

Correct arrangement.

Make the framework more rigid.

Correct it or replace it with good flange.

3.Belt wear.

(d)(f)

1.Overload.

2.Excessive initial tension.

3.Defective tooth shape and

tooth dimension of pulley.

4.Use in dusty atmosphere.

Change design.

Adjust mounting tension.

Replace with pulley of correct tooth shape and

dimensional.

Improve atmosphere, or install cover.

4.Pitch line direction scar of

tooth face of belt.

(h)

1.Protruding belt run from end

of pulley.

2.belt runs on flange.

Correct the axial degree of parallelization and

alignment of pulley.

Apply proper mounting tension.

5.Tooth jump of belt

1.Shock load.

2.Lack of initial tension of belt.

3.Lack of rigidity of framework.

Increase belt size.

Apply proper tension for mounting.

Increase the number of pulley teeth or teeth

engaged by idler.

6.Shearing damage of belt

teeth. Results from troubles 3 and 5 Same as 3 & 5 , above.

7.Partial severing of belt

(b)

1.Engaged foreign matter.

2.Belt runs on flange.

Improve the environment or install a cover.

Apply proper tension when mount the belt and

make exact degree of parallelization of axis.

8.Shrinkage

(k) Swelling by oil

Improve surroundings to prevent oil splashing

or install a cover.

9.Elongation in appearance of

belt

Mutual approximation of axes

shifting.

Mount the bearing firmly, and prevent bearing

movement with stopper in case of great shock.

10.Softning and stickiness of

rubber

(j)

1.Slip of back-pressing idler.

2.Oil attachment


Reduce inertia of idler.

Improve surroundings or install cover.

11.Wear of pulley tooth.

(l)

1.Improper pulley material.

2.Use in dusty atmosphere Improve atmosphere or install a cover.

12.Noise

1.Excessive initial tension of belt.

2.Overload.

3.Defective arrangement of pulley

and degree of parallelization of

axis.


Enlarge the size.

Adjust (correct) axial degree of parallelization

and arrangement of pulley

。

Trouble shooting

Trouble phenomena and measure

- - - 14 -

Type of damage Appearance Content

(a)

Belt severance

<Appearance>

Core-wire is bared lengthways.

<Cause>

Defective pulley alignment. Tooth jump of belt

due to engagement with foreign material.

(b)

Partial

severance of

belt

<Appearance>

Belt is partially severed. A scar may be seen due

to engagement with foreign material.

<Cause>

Defective pulley alignment. Tooth jump of belt

due to engagement with foreign material.

(c)

Early severance

of belt

<Appearance>

As seen in the picture, the belt is severed parallel

to the teeth, and the core-wire is also severed and

the bared core-wire is short and lined

.<Cause>

The belt is bent when storing or mounting the

belt (core-wire breakage). Too small pulley

diameter.

(d)

Early belt teeth

wear

<Appearance>

Wear of tooth-face cloth (fluffy cloth fiber, whitish

discoloration caused by excessive wear of

rubber coating). Rubber is bared and the tooth

width shrinks.

<Cause>

Overload Lack of belt tension (big chance of

belt wear) Too much belt tension.

(e)

Tooth shearing

<Appearance>

Crack at tooth root. Belt tooth disappears and the

belt becomes like a flat belt.

<Cause>

Defective tension Tooth jump due to shock

load. Tooth shear may be the terminal condition

of trouble (f).

(f)

Tooth root Wear

<Appearance>

Wear of cloth around tooth root area and the

core-wire is bared

.<Cause>

Too much tension. Improper belt size (lack of

belt ability).

Type of damage

- - - 15 -

Type of damage Appearance Content

(g)

Tearing-off and

wear of side

face of belt

<Appearance>

The edge is rounded and the belt-core is coming apart.

<Cause>

Belt is scraped against pulley flange due to

defective alignment.

(h)

Longitudinal

line along teeth

<Appearance>

Scar due to the belt running on the flange.

<Cause>

Belt running on the pulley flange due to defective

alignment. Lack of belt tension.

(i)

Crack on the

back of belt

<Appearance>

Cracking occurs on the back of belt in parallel

with the teeth.

<Cause>

The temperature is too high (the rubber

hardens).The temperature is too low (the

rubber does not change). The pulley size or the

idler size is too small.

(j)

Sticky or

softened rubber

on the back of

belt

<Appearance>

Attachment of softened rubber on the back of the

belt, or is sticky.

<Cause>

Caused by oil.

(k)

Swollen belt

<Appearance>

The teeth rubber or the back rubber swells up.

<Cause>

Caused by oil.

(l)

Wear of pulley

teeth

<Appearance>

The part where the pulley teeth is touching the belt

wears, and bump occurs. The tooth-face roughens

.<Cause>

Improper pulley material. Attachment of dust.

Too much belt tension.

instruction manual - tsubakimoto

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