[amayausers] Re: how tight is too tight

Wendy,
Not sure if one could answer your question with a general answer.  It all very 
much matters on the material the screw is made of and the material the screw is 
screwing into.
Remember this:
Black screws are heat treated and are usually very hard in nature (difficult to 
strip)
Silver screws are not and are made of a softer grade of metal and can be 
stripped easier (both the threads and the head socket where the wrench goes)
As for the material being screwed into,...aluminum is used extensively on these 
machines because its easier to mold and cut, relatively inexpensive, and rather 
light weight when compared to heavier, tougher metals such as steel.  However 
it's also easier to strip threads in screw holes.  One must also be aware of 
aluminum that is painted which makes it look like another grade of metal. (Such 
as the new cylindrical Amaya XT bobbin/sewing arm)

Melco does have a torque specification chart in the technical manual included 
on your parts manual CD but if you don't know what the difference is between 
foot pounds and inch pounds of torque, then you would do better trying to read 
Egyptian hieroglyphics.  You would also have to have the appropriate gauges to 
measure these torque specifications as well (torque wrenches).

You could use this thought process,  if it's just a cover or such, turn the 
screw until it seats (stops turning by hand) and then just snug it a tiny bit 
more.
If the screw is holding something in place that is sliding or rotating, then 
you are going to want it good and tight.
Some screws are meant to only be turned by hand (thumb screws) and others with 
special tools (security screws).  
There will also be some screws that are meant to only be screwed once because 
there will be a special Locktite metal glue applied to the threads so that the 
screw doesn't vibrate out.  Those can be a b**** to get out sometimes.

You must also know your own strength and the strength of the tools you're 
using.  Sometimes there's no substitute for experience in the field of screws, 
mechanics and yourself.  Yes, that means I have stripped more than my fair 
share of screws in life and I take that knowledge with me on every service 
call.  This is part of what you pay for with a good tech.

If something has to strip, then you want it to be the screw first.  You can 
always get another screw.  If the threads in the mating material are stripped, 
then this can be a bit more costly.  And yet there are sometimes options still. 
 Such as drilling out a slightly larger hole, cutting new threads and using a 
larger screw.  (Not always practical)  Sometimes drilling a clean hole clear 
through to the other side and using a long screw with a nut on the other end.  
It really all depends on the circumstances at hand.

Hopefully you can simply replace the damaged parts in question.
Wishing you the best.

Ed Orantes
Melco Tech & Trainer
504-258-6260
emservice@xxxxxxx

 
-------------- Original message from "Itchin To Stitch" 
<itchin@xxxxxxxxxxxxxxx>: -------------- 


> I am wondering when it comes to screws/bolts on the Amaya how tight is the 
> right 
> tight or too tight. I think I've managed to strip the threads on the bolt or 
> the 
> hole for the bolt on the female dove-tail bracket on my cap frame. I like to 
> take the bracket off after I'm done with caps because it just seems to give 
> me 
> more clearance for some things. I don't use my WACF very often so obviously, 
> in 
> this case, I've tightened too tight?? As a temporary fix, I've used a 
> temporary 
> lock-tight to get the bracket back on but I'm wondering if that will do the 
> trick. I thought about trying to find a replacement bolt as another option. 
> You 
> techs out there, any suggestions for me? 
> P.S. I HATE CAPS!!! 
> TIA, 
> Wendy Solomonson 
> Itchin' To Stitch 
> Arlington, MN 
> (507)964-2224 
> =========================================================== 
> 
> The AmayaUsers Mailing List 
> Website: http://www.amayausers.com 
> Discussion Board: http://www.amayausers.com/boards 
> Subscribe/Unsubscribe: http://www.amayausers.com/list 
> 
> =========================================================== 

=========================================================== 

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: