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Forum > Sewing Machines > Question - Rotary Hook, Oscillating Hook, CB Hook ( Moderated by Sharon1952, EleanorSews)

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Question - Rotary Hook, Oscillating Hook, CB Hook
What is the difference?
diningroomseamstress
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diningroomseamstress
Michigan USA
Member since 2/27/07
Posts: 864
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Date: 11/1/08 7:46 PM

Okay, maybe I'm showing how little I know, I apologize for my ignorance. But, I would like to know if someone could explain what the differences are in a rotary hook and an oscillating hook. And what is the difference between those and a CB hook? Are any of these better than the others? If so why/why not?

Thanks!

------
Carol - * I always have more time to sew *
Babylock Ellageo, Viking Mega Quilter, Janome MC6600P, Babylock Evolve Serger, Janome FM 725

Soolip
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Soolip
California USA
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Date: 11/1/08 10:28 PM

There's no difference in stitch quality or how the stitches look -- or how they are formed, either. A rotary hook moves in one direction. An oscillating hook brings the thread most of the way around the bobbin, then goes back to pick up the thread for the next stitch. Most industrials have a rotary hook -- though this is probably because of speed requirements (see http://www.pilotoutlook.com/parachute_rigger/sewing_theory)

Some manufacturers try to make one particular system (theirs) seem more desirable than another, but this is a little deceptive -- they are just trying to sell machines.

Some people believe that a rotary hook jams less than an oscillating hook. In my experience this is not proven to be true. A good-quality machine will be able to sew without jamming regardless of the hook system.

A CB hook system is a patented Bernina oscillating hook system that supposedly guarantees perfect stitches and thread tension on any fabric. I cannot tell you exactly how it works. This hook system seems to be on only some Berninas. Some of their machines use a rotary hook system, and it is not clear what the reasoning is.

I don't think that there's any mystery to getting perfect stitches on any machine, with either hook system. The auto-tension settings on every machine I've ever sewn on seem to work well. If you are sewing on a weird fabric that doesn't seem to work with the auto setting, it's easily remedied with a tickle on the tension dial.
-- Edited on 11/1/08 10:37 PM --
-- Edited on 11/1/08 10:58 PM --

Bill Holman
Bill Holman
Wisconsin USA
Member since 8/29/04
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In reply to diningroomseamstress
thumbsup 2 members like this.


Date: 11/1/08 10:46 PM

I have had enough inquiries over the years about this via e-mail, that I have a prepared PDF document that explains quite a bit about it. I am glad to attach it to e-mail replies to anyone who writes asking for the document about sewing machine hooks.

Bill Holman

Marji
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Marji
Missouri USA
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In reply to Bill Holman


Date: 11/2/08 11:32 AM

Quote: Bill Holman
I am glad to attach it to e-mail replies to anyone who writes asking for the document about sewing machine hooks.



Bill Holman

That line implies that you need to email Bill so that he can just hit "reply" then attach the PDF.
If you click on Bill's photo for his profile, you'll find his website, and his email addy is clearly displayed prominently at the header of his website.
I emailed him earlier and rec'd a prompt reply with the PDF attached.

------
Marji
http://fiberartsafloat.blogspot.com

sewalforfun

sewalforfun  Friend of PR
New York USA
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In reply to Marji


Date: 11/2/08 7:31 PM

Thanks Marji--because I was scratching my head on this one!! This was not clear to me, but I usually don't click on people's profiles, either. Alice in NY

------
Viking Diamond, Babylock Evolve, Babylock coverstitch, Viking D1, Singer 301, Singer 221, Singer 201

Betakin
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Betakin
Arizona USA
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In reply to diningroomseamstress


Date: 11/3/08 2:30 AM

Well, pooh..I just posted on another thread about the different hooks before I saw this thread. Bill Holman can certainly explain it well and entirely.
I just thought that the difference is..the rotary hook moves the bobbin in a complete circle while the oscillating hook moves the bobbin back and forth.
All of my machines have rotary hooks. All have top loading bobbins except for my Pfaff. The Pfaff is front loading but has a rotary hook though many front loading bobbin machines have oscillating hooks. I found less fabric jams with my rotary hook machines. Many ads for machines say "jam free rotary hook" though ..jam free has been debated on this forum by some members saying no machine is jam free.



Member since 12/31/69
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In reply to Betakin


Date: 11/3/08 6:42 AM

Quote:
I just thought that the difference is..the rotary hook moves the bobbin in a complete circle while the oscillating hook moves the bobbin back and forth


The bobbin doesn't move at all on the rotary or the oscillating hook machines. It remains stationary and the hook moves around it.
gonesewing
gonesewing
British Columbia CANADA
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In reply to Bill Holman


Date: 1/13/11 10:51 PM

Are you able to email me a copy of your pdf re the differences with these , cb, rotary, oscillating hooks?
-- Edited on 1/13/11 10:53 PM --

TessKwiltz
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TessKwiltz  Friend of PR
Texas USA
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In reply to gonesewing


Date: 1/14/11 2:33 PM

gonesewing, I didn't want you to think you were being ignored, but Bill doesn't visit PR any more. He has the pdf file mentioned in this thread in the files section of the Vintage Singers Yahoo group:
http://groups.yahoo.com/group/vintagesingers/
You will have to request membership, but they are very welcoming.

------
Tess

"I am a degenerate art supply junkie" - Jane Davenport

GothDom
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Date: 1/15/11 0:50 AM

Rotary hook machines are quieter, simply because the machinery doesnt have to change the direction of the hook

------
http://www.acdc-vintage.com
This one, that one, and a bunch of other ones!
(though the herd is getting more streamlined)

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