Hello, I am makeing a power wrapper and I have a 25-75rpm sewing maching motor. I rigged it up with a 2-1/2" pulley and it seems the chuck is spinning way too fast. Also the motor feels like it might be struggling a little bit on power. a bigger pulley would also help, correct? What size pulley should I try to use? 4"? Also where can I get a pulley wheel, that is kind of lightwieght and has a center bore of anywhere between 3/8" to 3/4". I am going to post picture of my power wrapper when i get it operational. Thanks.

Try smallparts.com or Herbach.com or search for Machine Parts

on the machine I built I used a 100 yd Stren Spool with a Alum spacer for the shaft

I have found them in Mom/Pop hardware stores. Or tractor supply stores. For get the large chain type lumber/hardware stores

In the new issue of RodMaker, you can see Doug Cox's solution to the pulley problem - he just made his own. A beautiful job, lightweight and about 4 inchs, if I recall correctly. The motor pulley was about 1/2 to 3/4 inch, I think.

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If you know the RPM you want to acheive at the chuck, you can figure out the correct pulley diameter. It may be a little hard for me to explain, being neither a math guy, or a writer- but let's try.

Let's say your motor RPM is 25, and you want to turn the chuck at 10RPM. Divide the motor RPM by the desired chuck RPM. In this case it's 2.5. So- you'd need a pulley 2 1/2 times as big. You can plug any numbers you want in here- it still works out. Sorry I couldn't provide a real formula. :)

In your case with a 2 1/2" pulley if you wanted to reduce 25 to 10 RPMs- you'd need a 6 1/4 inch pulley.

Another thing- I assume you are using some type of speed control on that sewing machine motor to vary the RPM? Those little motors make more torque at higher RPM, so you will probably be happier running it at half speed or more- so 50 RPM to 10RPM would require a driven pulley 5 times as big.





Edited 1 time(s). Last edit at 08/01/2005 11:59PM by Donn Lawty.

I can't wait to see how this one goes as I am considering the exact same project from an old school, belt-driven, Singer.

Keep up the good work Matt R.

Derek
dsrtegl2004atearthlinkdotnet

The no-load RPM on those Dayton motors is up around 5000. So you need a pretty good difference in pulley sizes if you want the top RPM to be workable. Obviously, with a variable speed foot control, you can keep things under control without resorting to a really huge pulley on the headstock, which would slow the speed of the chuck but also greatly increase the back-pressure when you turn by hand to start or finish a wrap.

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My wrapper uses a Dayton 1/10 HP motor that turns 8000 RPM. The pulley on the motor shaft is small, like 0.65 inches. I'm using the improved chuck and powerhead from Pac Bay, which is very substantial for wrapping and light cork truing if required. The pulley on the Pac Bay chuck/powerhead measures 4".

Besides the variable speed foot control, I have another spped controller wired in. The two controllers work very well in combination for speed control. As noted above, the motor and powerhead permit.

I'll post photos once I get my chaotic wrap table cleaned up a little.

Stan

CORRECTION:
That second & third sentences from the end should have read:
"The two controllers work very well in combination for speed control. As noted above, the motor and powerhead permit light turning /truing of cork, as well as buffing, etc."

Stan

Matthew,

I posted some photos of my home built wrapper.

It's 9' long and is built in three sections (4', 3' and 2') which mate up. It's very sturdy and weighs in at 52.5 lbs. total. The powerhead section (4') is easily separated and carried outside for any final cork truing that might be required. The 2 foot section functions well as a transportable non-powered wrapper, with a couple of stand-alone rod supports.

If you have any questions, shot me an e-mail.

As you might suspect, I enjoy building things. Good luck in your project.

Stan

Thanks Tom and everyone, I am pretty much going with a 4" wheel as soon as i can find one. My motor states 25-75rpms. It is an old singer motor. So i don't think i will have to slow it down much more. Although I might just get the improved chuck from someone. Stan, I really like the 3 section idea for travel and sanding outside. Designing the chuck has been the hardest part. The rest of the wrapper was pretty easy to build but I used alot of 1/4" bolts and hardware. I will post pictures with labels to the site when I get it finished.