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Kitcarlson

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Belts:

Motor belts are something not thought about, unless there is a problem. Finding an immediate local replacement belt may be difficult. An original belt numbers are sometimes unreadable. It is also possible reproduction belts with Singer # vary in size, by source. While belts are often listed to by machine model, models were produced for decades, motor brackets varied resulting in different belts.

Singer machine models 127, 28, 128, 99, 66, 15, 115, 201K all fit well to Singer hand cranks, this suggests mount boss and hand wheel center are a standard measurement. Motor designs and brackets vary along with adjustment range, resulting in different belt lengths. My experience is 196388 or 193066 fit vintage Singer machines with BT7 motor and adjustable bracket.

Measuring Belts:

Belts are typically measured by outer circumference. One way to measure is tape down a tape measure, and mark a start position on belt. Carefully extend the belt by holding down belt with one finger at start point, then extend another finger to hold next point without slipping belt, repeat to mark, and measure. Repeat a couple times to insure no slippage or other error. It is also possible to use a 1/4” wide measuring tape, measure in place, around pulleys, however measurement deviation may exceed belt measurement by a few 1/8th of an inch. Belt width measures about 0.244”, so 0.25” tape will have a slightly longer path.
20200119_192559.jpg 

Belt Measurements:

Simanco #   Circumference

196388        13 1/2” * Reproduction new

193066        13 5/8”   Reproduction new

unmarked    13 3/4”   1925 Singer 99 small electric hand wheel

196386        14 3/8”   Reproduction new

198651        14 3/4”   Simaco 99-24 Bakelite motor

193077        15 5/8” * Reproduction new

* denotes same as table below

 Tabular info below from:

https://www.singersewinginfo.co.uk/motors/
-
-----------------------------------------------------------------------------------------------------------------------

Simanco Part No.

Type

Outside Circumference

Fitted To Machines

 

 

 

 

196389

1/4" Vee

12-3/4" (32.4 cm)

275, 285

196388
(604136)

1/4" Vee

13-1/2" (34.3 cm)

201K23, 237, 239, 240, 241, 242, 247, 248, 250, 251, 252, 257, 259, 285, 288, 293, 377, L47

193066

1/4" Vee

14" (35.6 cm)

15 with spoked wheels, 27, 28, 127, 128, 187, 201K3, 239

196386

1/4" Vee

15" (38 cm)

185, 201K23, 215, 227, 237, 286, 337, 338, 347, 348, 413, 416, 418, 449, 457, 466, 477, 478

193386

1/4" Toothed Vee

15" (38 cm)

(As 196386 but toothed on inside)

198651

1/4" Vee

15-1/8" (38.5 cm)

15-88, 15-90, 27, 66-6, 66-8, 66-14, 66-18 to 16-24, 99-24,31, 127, 128, 185, 192, 206, 223, 306, 319, 327, 328, 329

193077

1/4" Vee

15-5/8" (39.8 cm)

15, 27, 28, 99-13, 127, 128 with solid balance wheels, 317, 327, 328, 359

194144

1/4" Vee

17-1/2" (44.5 cm)

221, 221K, 222K, 301

353518

1/4" (6 mm) flat toothed

13-1/2" (34.4 cm)

6212C

312628

6mm flat toothed

20" (50.8 cm)

6240

604136

Toothed Vee

 

148, 258, 277, 360, 362, 367, 368, 377

603975

5mm Timing Belt

15-1/4" (38.7 cm)

141, 143, 163, 353, 354, 502, 507, 513, 514, 518, 522, 527, 533

045174

5 mm Stretch Belt

13-3/8" (34.0 cm)

 

NOTE - On some machines, the belt size can vary depending on the type of motor or balance wheel it has fitted. Before buying a replacement always check by measuring around the outside of your old belt, or by wrapping a cord around your machines pulleys.
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Pulley Measurements:

Handwheels:

Measure of hand wheel outer belt diameters with a caliper, with belt around pulley.

OD Diameter and Circumference   Diam.  Circ.
3/4 Size

Spoke 99/128 hand wheel belt OD     2.67”   8.39”  (original for round belt)

Solid   99/128 hand wheel belt OD     2.62”   8.23”  (vee belt)

Full Size
Solid 66        hand wheel belt OD       3.13”   9.83”
Solid 66        hand wheel belt OD       3.60”  11.31”
20200122_140436.jpg 
20200130_103815.jpg 

Motor Pulley:

Measured with belt around pulley                   OD     Circumference

 BT7 motor pulley belt diameter                     0.85”      2.67”

BA3-B Bakelite plastic pulley belt diameter      0.83”      2.61”

Import universal small pulley belt diameter *  0.68”      2.14”

*(use notched belt for improved bend radius)
20191218_090702.jpg 

Hand Wheel/Motor Ratios using Bakelite Motor Pulley (2.61")
Hand Wheels                                                           
Singer 99 solid small               1 : 3.15
Singer 66 solid medium           1 : 3.77
Singer 66 solid large               1 : 4.33

Motor Bracket Vertical Adjustment:  Vertical Adj. (Slot Length – Bolt Diam.)

BT7 with idler pulley                                0 (for use with round leather belt)

BT7 w/adj Slot-Bolt Diameter                  0.35” (pulley to pulley distance ~ 4.25”)

Later Model Singer Motor                        0.55”

After Market Stamped                            0.87”
20200122_080600.jpg 
20200122_080739.jpg20200122_081654.jpg
 
 20200122_081614.jpg 20191218_091927.jpg 

Belt Length Calculation App:

Belt length is easily estimated with use of on online application. Pulley diameters, and pulley to pulley center distances are entered, returning belt length, and drive ratio. I entered pulley information, and estimated distance, result was close to actual belt. Pulley to pulley distance is difficult to measure since measuring center of stop nut to motor pulley is offset. An error in distance is multiplied by
two.
Belt length estimates based on 4.25" between shaft centers, 0.83D small pulley.

Hand Wheel Pulley    Belt Size
     
 2.62"                     14.1"
       3.13"                      15"
       3.6"                       15.9"

https://www.blocklayer.com/pulley-belt.aspx
Screenshot_2020-01-23-11-30-25.png 

I
nteresting BT7 light outfit (kit) instructions:
2020-01-20 10.09.13.jpg  2020-01-20 10.10.41.jpg  2020-01-20 10.11.32.jpg  2020-01-20 10.12.11.jpg  2020-01-20 10.12.40.jpg  2020-01-20 10.13.15.jpg  2020-01-20 10.13.45.jpg  IMG_20200120_181827.jpg 
Here is edited improved post in pdf format:


Attached Images
jpeg 20200122_081654.jpg (158.28 KB, 9 views)
jpeg 20200122_081614.jpg (173.10 KB, 11 views)
jpeg 20191218_091627.jpg (116.02 KB, 9 views)
jpeg Screenshot_20200125-063337_Chrome.jpg (420.42 KB, 3 views)

 
Attached Files
pdf Belts_r1.pdf (3.09 MB, 3 views)


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Dave in middle TN

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pgf

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Reply with quote  #2 
Great resource -- thanks!
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My machines: http://projects.foxharp.net/sewing_machines/by-age
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Kitcarlson

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Reply with quote  #3 
You are welcome.  I would like to edit format of SingerSewingInfo table, but no luck yet.
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Dave in middle TN
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OurWorkbench

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Reply with quote  #4 
what kind of formatting?

Simanco Part No.TypeOutside CircumferenceFitted To Machines
    
1963891/4" Vee12-3/4" (32.4 cm)275, 285
1963881/4" Vee13-1/2" (34.3 cm)201K23, 237, 239, 240, 241, 242, 247, 248, 250, 251, 252, 257, 259, 285, 288, 293, 377, L47
-604136
1930661/4" Vee14" (35.6 cm)15 with spoked wheels, 27, 28, 127, 128, 187, 201K3, 239
1963861/4" Vee15" (38 cm)185, 201K23, 215, 227, 237, 286, 337, 338, 347, 348, 413, 416, 418, 449, 457, 466, 477, 478
1933861/4" Toothed Vee15" (38 cm)(As 196386 but toothed on inside)
1986511/4" Vee15-1/8" (38.5 cm)15-88, 15-90, 27, 66-6, 66-8, 66-14, 66-18 to 16-24, 99-24,31, 127, 128, 185, 192, 206, 223, 306, 319, 327, 328, 329
1930771/4" Vee15-5/8" (39.8 cm)15, 27, 28, 99-13, 127, 128 with solid balance wheels, 317, 327, 328, 359
1941441/4" Vee17-1/2" (44.5 cm)221, 221K, 222K, 301
3535181/4" (6 mm) flat toothed13-1/2" (34.4 cm)6212C
3126286mm flat toothed20" (50.8 cm)6240
604136Toothed Vee 148, 258, 277, 360, 362, 367, 368, 377
6039755mm Timing Belt15-1/4" (38.7 cm)141, 143, 163, 353, 354, 502, 507, 513, 514, 518, 522, 527, 533
451745 mm Stretch Belt13-3/8" (34.0 cm) 



Janey

 
Attached Files
xlsx singersewinginfo.xlsx (9.54 KB, 8 views)


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Janey & John

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Kitcarlson

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Reply with quote  #5 
Thank you for trying.

Here is what it looks like in post editor on this site, see below. It changes when posted.


I will post .pdf of LO version, need to insert pictures, and other updates.

 
Attached Files
pdf screencapture-victoriansweatshop-post-2020-01-25-06_17_27.pdf (2.82 MB, 9 views)


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Dave in middle TN

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WI Lori

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Reply with quote  #6 
Great information, thank you!
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Lori in Wisconsin
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Kitcarlson

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Reply with quote  #7 
I edited my post and created pdf version from LO writer. I was unable to get desired desired formats in original post.  I am still learning.

 
Attached Files
pdf Belts_r1.pdf (3.09 MB, 8 views)


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Dave in middle TN

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Kitcarlson

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Reply with quote  #8 
Edited first post, added 2 additional hand wheel pulley diameters  and associated ratios and estimated belt sizes. Fixed belt length calculator url.  Will update above Belts.pdf
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Dave in middle TN
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