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Posted

Ideally, the belt should set flush with the outer circumference of the pulley. So the belt size is measured around the outside. Make sure you measure around the outside of the pulleys to get the length. You should be able to roll the belt onto the pulley, but sometimes with new belts you can't. You can lift up the sewing end of the head and slip the belt on, or if the motor is in the standard position on a standard table, you can tilt the head back to install the belt. I know I have never removed a balance wheel to install a belt.

Art

I still prefer my piece of rope :) . As LumpenDoodle said, it's idiot proof (probably why I like it). No maths, no calculators, don't even need to log onto the computer to use it. Rope of the correct diameter, however, will be better than string as it will fill the pulley grooves.

(The guy at one shop had a measuring device that basically stretched the belt/rope/whatever between two half pulleys, mounted on a ruler. That way he could read off the exact size that I needed).

Anyway, maths makes my brains hurt.....

Here is the easiest way to get belt length:

1:) set adjuster to somewhere around 25% of total travel. This should leave you enough slack to make installing the belt easy but give you plenty of stretch adjustment.

2:) measure outside diameter of both pulleys.

3:) measure the distance from the center of one pulley to the center of the other.

4:) Plug these three numbers into this calculater: http://www.blocklayer.com/Pulley-BeltEng.aspx

5:) Double check with this calculator if needed: http://www3.telus.net/shebang/pulley_calculator.html

6:) Order belt to nearest 1/2 inch if possible. Done. No math needed.

I was about to post the same thing. I always tilt the head back to replace belts, to oil the underside bearings, etc. All industrial sewing machines on standard tables have pivots on the back.

Hey guys, i think ive got the belt down now! Finally lol.

Wizcrafts, yes your right my machine does have the hinges, but i took them off to remove the head when i bought the machine and i have since lost them. Ill have to buy another pair. But when i tried to lean the machine back while on the hinges i could not for some reason So at this point if ever i need to get or look under the machine i will have to lift the whole head up.

Looks like you still have more adjustment on the motor to move that pulley closer to see if the belt you have would fit.

Something you can try (since you won't be needing the old belt) is: Cut the old belt. Wrap it as tightly as you can in the grooves of both pulleys, then mark the point where the belt's end laps. Measure to that mark. Ask for that belt size.

-DC

Colt yes u were right, Bob walked me through how that worked on the phone. The previous belt was still a tad too short though when i adjusted it higher, i could wrap it around the bolt on the outside of the pulley burt not the actual pulley.

SO. Now that the belt problem seems to be solved i now have a new one; with the bobbin winder. Its not actually filling the bobbin. Made a short video to try and make the problem easy to diagnose. What could i possibly be doing wrong now?!

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Hey guys, i think ive got the belt down now! Finally lol.

Wizcrafts, yes your right my machine does have the hinges, but i took them off to remove the head when i bought the machine and i have since lost them. Ill have to buy another pair. But when i tried to lean the machine back while on the hinges i could not for some reason So at this point if ever i need to get or look under the machine i will have to lift the whole head up.

Colt yes u were right, Bob walked me through how that worked on the phone. The previous belt was still a tad too short though when i adjusted it higher, i could wrap it around the bolt on the outside of the pulley burt not the actual pulley.

SO. Now that the belt problem seems to be solved i now have a new one; with the bobbin winder. Its not actually filling the bobbin. Made a short video to try and make the problem easy to diagnose. What could i possibly be doing wrong now?!

On your bobbin winder - I had the same problem - Take a flat head screw driver and wedge it into the slot in the peg to spread it out some.

20151115_205754_zpswhque5nq.jpg

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Posted

Chinese adjustable diameter bobbin shaft.

Simple fix with 38 cents left over.

Art

For heaven's sakes pilgrim, make yourself a strop!

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Posted

Chinese Precision adjustable diameter bobbin shaft.

Simple fix with 38 cents left over.

Art

Fixed that for ya. No hammer was needed....

"If nobody shares what they know, we will eventually all know nothing."

"There is no adventure in letting fear and common sense be your guide"

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Posted (edited)

On your bobbin winder - I had the same problem - Take a flat head screw driver and wedge it into the slot in the peg to spread it out some.

20151115_205754_zpswhque5nq.jpg

Ahhhh! Thanks Colt! Im already at work but i will try this when i get off. AM i to keep the flat head in that slot when its winding, or am I just to wiggle it around to get some separation and then take it out??

Chinese adjustable diameter bobbin shaft.

Simple fix with 38 cents left over.

Art

Wait is that an actual part?? Lol, I'm gonna look that up too... Thanks guys for the help. Im gonna try Colt's screw driver idea right after work! Edited by MG513
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Posted

I clicked on a thread about servo motors, now we're doing bobbin winder adjustments??? :red_bandana:

Industrial sewing and cutting, parts sales and service, family owned since 1977, Philadelphia, Pennsylvania USA, 215/922.6900 info@keysew.com www.keysew.com

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Posted

Ahhhh! Thanks Colt! Im already at work but i will try this when i get off. AM i to keep the flat head in that slot when its winding, or am I just to wiggle it around to get some separation and then take it out??

Pry it apart a little till the bobbin fits snugly, then take the screwdriver out.

Art

For heaven's sakes pilgrim, make yourself a strop!

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Posted

May I suggest, for the sake of your safety, that you remove the screwdriver after giving it a bit of a wiggle to open up the splitty bit on the shaft.

Otherwise, make sure you have health insurance. ;-() (or have the camera running for a good bloody youtube vid).

 

“Equality?   Political correctness gone mad, I tell you, gone mad!!!!    Next they'll be wanting the vote!!!!! :crazy:“.

Anger and intolerance are the enemy of correct understanding

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Posted

I clicked on a thread about servo motors, now we're doing bobbin winder adjustments??? :red_bandana:

Hi Gregg,

It started with Motors, then progressed to belt fitting (drive belt), and then it was off to Bobbin Winders. All pretty much a progression to get the same user up and running.

Art

For heaven's sakes pilgrim, make yourself a strop!

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Posted

Hi Gregg,

It started with Motors, then progressed to belt fitting (drive belt), and then it was off to Bobbin Winders. All pretty much a progression to get the same user up and running.

Art

Oh I'm just kidding around here, of course. Bobbin winders need love, too! Hope my posts dripping with sarcasm don't come off wrong, not trying to kill this thread by any means.

Industrial sewing and cutting, parts sales and service, family owned since 1977, Philadelphia, Pennsylvania USA, 215/922.6900 info@keysew.com www.keysew.com

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