Signs of mechanical wear/damage and their origin
Signs of mechanical wear/damage and their origin
(OP)
Does anyone know of some kind of website/book that lists different kinds of possible wear/damage on metal and their origin? We received pictures from a customer (which I am not at liberty to share) with a kind of damage I can not seem to place.
I apologize for the vague description.
I apologize for the vague description.
NX 7.5.5.4 with Teamcenter 8 on win7 64
Intel Xeon @3.2GHz
8GB RAM
Nvidia Quadro 2000





RE: Signs of mechanical wear/damage and their origin
RE: Signs of mechanical wear/damage and their origin
RE: Signs of mechanical wear/damage and their origin
Just in case your problem is with bearings, attached are a couple of good references.
Best to you,
Goober Dave
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RE: Signs of mechanical wear/damage and their origin
Best to you,
Goober Dave
Haven't see the forum policies? Do so now: Forum Policies
RE: Signs of mechanical wear/damage and their origin
Weird thing is that most of them are in the bottom part (=pressure part, not tension part) of the boom.
Lines run in a plane perpendicular to the length of the boom.
Not allowed to post pictures, sorry.
NX 7.5.5.4 with Teamcenter 8 on win7 64
Intel Xeon @3.2GHz
8GB RAM
Nvidia Quadro 2000
RE: Signs of mechanical wear/damage and their origin
RE: Signs of mechanical wear/damage and their origin
Imagine the concept of giving enough info. so that there could be a meaningful discussion about an engineering problem. Then imagine sharing some photos which probably don’t identify the equipment designer or builder, but might show something that an experienced engineer might have seem before and recognize, and be able to comment on. Then, imagine not doing any of that dumb stuffr and being silly enough to think you will get some meaningful comments from people who can’t see it from here. You have just created/posted the perfect thread. I would just go to www. answers/is/us. They have millions of answers for everything. You pick the answer that best covers your a.. And, they don’t confuse the issue with a need for any meaningful question, with enough info. to start a serious discussion.
Something is rubbing or grinding at a bearing point or an inadvertent touching point, within the boom, at any boom extension length where it remains while some lateral action out at the boom tip can cause lateral motion back in the back span of the boom.
RE: Signs of mechanical wear/damage and their origin
It is a capital mistake to theorise before one has data. Insensibly one begins to twist facts to suit theories, instead of theories to suit facts. (Sherlock Holmes - A Scandal in Bohemia.)
RE: Signs of mechanical wear/damage and their origin
Shot in the dark.
Without any information it sounds like it could be a result of the manufacturing of the tube extrusion.
RE: Signs of mechanical wear/damage and their origin
Any idea how the part was made. If extruded, any post treatment? I am thinking maybe extruded just a little cold. If post treated maybe a short cycle and not treated all the way through.
dhengr and Artisi make good points. However, in my world, it is not at all unusual it get a call that goes something like "I have a part here that is maybe steel and it broke. Can you tell me why and how to fix it?" We start from there and eventually figure something out.
My problem solving method sometimes works like yours. Quite often someone will pipe out and say "I'll bet that is an Acme 423 boom from 1998. They got bad steel for those."
Good Luck,
Tom
P.S. I don't suppose you or anybody previously is doing anything strange with that equipment?
Thomas J. Walz
Carbide Processors, Inc.
www.carbideprocessors.com
Good engineering starts with a Grainger Catalog.
RE: Signs of mechanical wear/damage and their origin
RE: Signs of mechanical wear/damage and their origin
That was our first thought, and that's exactly what they look like.
Unfortunately, the position of the lines doesn't add up to where they would be should the wear pads be worn out/missing.
to all:
Thanks for all the info (even the fortune telling part). I know I am not giving enough info for you people to solve this problem, but I was more looking for places I could search, then for an actual answer to my problem.
@BigTomHanks
Booms are cut out of steel plates, bent in U-shapes and welded together. No extrusion here. Thanks anyway though.
If anyone could suggest a none-destructive way of checking the material, that can be done in-situ, that would be awesome. (for now, I said: mark the lines, step way back, overcharge the machine, and see if the lines get bigger)
NX 7.5.5.4 with Teamcenter 8 on win7 64
Intel Xeon @3.2GHz
8GB RAM
Nvidia Quadro 2000
RE: Signs of mechanical wear/damage and their origin
I think some visual inspection of the "lines" with good light and magnification would be useful.
Dye penetrant inspection, and better yet fluorescent DPI might offer something , at least to determine if they are "wear" or perhaps material defects that have opened up because the plate was bent transversely (parallel to rolled grain) and the material started with a bunch of seams, etc.
http://t3.gstatic.com/images?q=tbn:ANd9GcRc9TkjJ0c...
http://michigantoday.umich.edu/2009/05/bendable-co...
RE: Signs of mechanical wear/damage and their origin
Fill them in with something like wax or spackle. Run machine. Look for little pile of wax or spackle.
RE: Signs of mechanical wear/damage and their origin
RE: Signs of mechanical wear/damage and their origin