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Posted (edited)

Good work,  I like the first vid the best as the machine gets used & the parts get play in them it'll prevent alot of feeding problems if it's adj.that way.                                                 

 

Edited by CowboyBob

Bob Kovar
Toledo Industrial Sewing Machine Sales Ltd.
3631 Marine Rd
Toledo,Ohio 43609
1-866-362-7397

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Posted

Page #18 , "(10) Feed cam timing" has some information about this, however it may differ from the settings on the Consew 206RB or Seiko STH-8BLD-3.

 

 

LU-1500N Engineers Manual.pdf

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

Yes thats more of my experiences, the 15series. Its always a great interest in looking through some others manuals for following their troubleshooting. 

Thanks Gregg for the manuals, sure puts a light on some of these issues we talk and ask of you Pros 

 

good day

Floyd

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Posted

I have a "Bob sez" list of things I've cut-n-pasted from this site.  It's a good resource.  (Actually, I have 4 or 5 of these lists, based on comments from different tech contributors here.)

Anyway, Bob - I need to clarify which video you think was the best.  I  went back and renamed all the videos in this thread: Video 1, Video 2, etc.  You can see the title in upper left corner of each one. 

Above, when you said "I like the first vid the best...", did you mean Video 2, which was the 1st video I posted after I adjusted the presser foot timing, but before I messed with the feed dog lift timing?

Thanks.

 

Gregg - thanks for the additional manual.  As Floyd already mentioned, it's surprising how often different manuals help clear things up. 

Correct me if I'm mistaken, but I think the page18 procedure you referenced in the Juki manual is the same adjustment as Seiko 8-5, which is the yellow-colored cam in Uwe's picture, which controls when the horizontal component of feed dog motion begins and ends. 

What I learned from Uwe's post is how to control when the vertical component of feed dog motion begins and ends by adjusting the timing of the blue-colored lift cam in his image.

 

What I learned from Bob (pending his reply here) is that a more "sloping up" feed like what is shown in both Video 1 and Video 2 can be a good way to set the machine up, rather than using the blue-colored feed dog lift cam adjustment to seek a more "rectangular" feed dog action. 

Two more FYI comments:

FYI #1 - I used a good quality ruler to measure the horizontal distance traveled by the feed dog during the interval that it is significantly above the throat plate height.  I set my SL to 3.5, and then measured how far the feed dog traveled while it was at least "halfway above" the throat plate.  IOW, since my feed dog height is 1mm, I measured how far the dog traveled during the time that it was at least 0.5mm above throat plate height.  Before I changed the timing of the blue-colored lift cam, the travel distance was 4mm.  After I adjusted the blue lift cam, it was still 4mm.  The only thing that changed was that instead of having a long slope up to a plateau and then a sudden drop-off, now it had a short slope up, a plateau, and then a short slope down. 

This supports Bob's comments.  Either way will feed the same amount.  Bob gives reasons why "sloping" feed eccentric may be better.    

My original feeding problem wasn't caused so much by a long sloping-up feed dog motion as it was caused by having the inside foot arriving to early, jamming the material down into the throat plate opening until the feed dog rose enough to push it back out  

FYI #2 - In the OP, I mentioned the part #4 feed rock shaft base.  I did a series of tests on this part.  It had no effect on anything.  My method: retard #4 a little, then advance #24 feed rock shaft crank the same amount.  Test outcome.  Repeat and test again.  I did 4 iterations.  I far as I can tell, an adjustment to #4 is the same as an adjustment to #24 - it changes the horizontal (longitudinal) position of the feed dog, but nothing else. 

OK.  Thanks again to all.  Bob - shoot a quick reply when you have a minute.  I gotta keep my Bob sheet updated.  B)

Dave

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