Consew 206RB1 scrubing noise

[Hooiam]

My first post, I've recently aquired my first industrial machine a Cnsew 206RB1. I have an issue I can't seem to figure out, it makes a scrubing noise under the bed, close to the needle plate , and feed dog area. I can't find anything under there that appears to be touching while I cycle themachine with the hand wheel, but the noise is still there. Is there anything you guys may have come across that may be the cause? Thanks in advance for any help.

[brmax]

Welcome to forum!

With the motor belt off and presser feet placed in up position. I can better turn the hand wheel and possibly feel any issues. 

If one can tilt the machine back on a stand and get a better view of the hook, its possible to see thread in betwen the hook and bobbin basket. 

I will take a look at these places mentioned prior to removing the plate covering the feed dog for more visual interest. 

 

Good day

Floyd

[kgg]

I would first remove the needle, bobbin and bobbin case  then cycle the machine by hand and see if the noise is still there. If there is no noise replace the needle with a new one and a different bobbin. If there is a noise I would as brmax suggested, remove the drive belt and tilt the machine back. I would look and feel around for something amiss (thread, loss screw, etc ) as you turn the wheel. If the noise returns when you replace the needle, bobbin and bobbin case then maybe the hook timing is slightly off if the bobbin case is in good shape. If you figure it is a timing problem do a google search for Consew 206rb-1 manual pdf. It will outline how to re adjust the hook timing.

kgg

[garypl]

There are good videos on YouTube about timing the Consew 206RB - just search for Consew 206RB in YouTube

Gary

[DonInReno]

Is the machine well oiled everywhere there’s metal to metal contact? 

Sounds and even vibrations can be misleading so keep an open mind as to what part of the machine is causing the issue.  

Use a strong flashlight and look closely under the bed and all around the hook - look for moving parts that get close to other parts as the scraping occurs. Take the upper plate off so you can see the workings surrounding the needle bar and presser foot bars.  All metal to metal contact points are well oiled in there?

One 40 year old machine had a slight interfearance defect that should have been filed down at the factory and the original owner simply figured it was normal.  There also may be part of a needle or a loose screw in there somewhere.  I also look for contact points - scratches, dents, etc. where a machine may have been dropped tweaking something.  

Does the noise go away if the presser feet are raised? 

Many aftermarket presser feet aren’t as exact as they could be - use a flashlight behind the feet to see if they are rubbing each other.

Then I’d take the bobbin and case out - again aftermarket parts do not always fit as well as they could or have as strick controls over dimensions. 

Take off the needle and presser feet.

Then unscrew the needle plate screws a few turns, keep a finger on the plate and cycle the machine by hand - if the feed dogs are hitting the bottom of the needle plate you will feel it.  The feed dog might not be square with the needle plate slots due to a defect.  You might wonder why someone would install a defective part, but some machines up for sale are a collage of the very worst parts taken off numerous machines or new parts uninstalled once they were found to be defective.

Remove needle plate and feed dog - look closely all around the hook.  All the metal to metal contact points are well oiled? Any used machine like yours should have the hook out since there’s a lot of crap that can pack under it - best to wait until you understand the process of resetting the hook timing and have a good reference video in case it gets confusing. 

If you aren’t sure how to adjust something don’t mess with it or you may create new problems.

Good luck finding it!  Be sure and let us know what it is when you eventually track it down!

 

[chrisash]

Probably a silly answer , but have you put a drop of oil on the hook

[Hooiam]

Thanks for the replies. After reading what you guys posted I had another look at it, turns out it was a small 90 degree L bracket, it's called a "needle bar rock frame position bracket" acording to SouthStar Supply's parts breakdown diagrams. I just loosened it up and repositioned it a bit, and voila scrubbing gone.

Now i just have to figure out why the hook sometimes pops to wrong side of the thread release finger. It also pops the safety clutch when this happens.

Just a little preface on parts I've already replaced( I should've added that in th OP.) It has a new tesion assy, bobbin case, a servo motor, and I've made sure the timing is right, there are some good videos on YouTube.

Thanks, Shawn