[amayausers.com] Re: Thread Feed
- From: theboards@xxxxxxxxxxxxxx
- To: amayausers@xxxxxxxxxxxxx
- Date: Mon, 12 Mar 2012 15:51:33 UT
This message was posted by Rod or Sharon on AmayaUsers.com. PLEASE DO NOT REPLY
VIA EMAIL. Instead, respond to the thread on the WEBSITE by clicking here:
http://www.amayausers.com/boards/cgi-bin/ultimatebb.cgi?/topic/1/1317.html#000002
The needlecase is comprised of 4 separate 4 packs.Each 4 pack has an upper and
lower bushing for each needlebar. If debris or lack of lubrication builds up or
causes damage then excessive drag may cause a problem. If screws are
overtightened on the face of the needlecase, it immediately squeezes the
needlepacks and binds the needlebars in the bushings, causes drag and excessive
wear. These partictular screws are torqued to 8 inch pounds of pressure, which
is not very much.
But, it may not be in the needlebars or bushings. It may be thread buildup from
thread wrapped around gearing in the threadfeed drive system. It may be a sign
of a Z axis motor getting weak or a combination of all three.
Think of all the needles being in a perfect straight line and a centerline
running through them. Because of tooling tolerances the needles will wander
along both sides of this centerline. This is how the "closest needle" is
derived from, which is what the hook timing is timed to. If the needlecase is
more than 6 thousands of an inch off the center line, it is considered to be
defective. For instance, if a needle is found to be .003" off on one side and
another to be .004" off on the other side of the centerline, then the
needlecase is considered to be defective. This equates to too large of a gap
between the face of the rotary hook point and the back of the needle which
would cause the hook to miss picking up the top thread.
The first place to start is check the hook timing. Make sure the needles are
not bent and hanging up on the hook point. Check for thread buildup. Do a FULL
lubrication sequence on the machine. Check the main threadfeed drive gear for
cracks around the hub. My gut feeling is this may be a more serious condition
then you really want it to be and that dreaded tech call may be a wise move to
find out just what the "root" cause is.
Let us know what you find...
Rod Springer
Amaya Tech & Trainer
===========================================================
The AmayaUsers Mailing List
Website: http://www.amayausers.com
Discussion Board: http://www.amayausers.com/boards
Subscribe/Unsubscribe: http://www.amayausers.com/list
===========================================================
Other related posts:
