Thanks Thanks:  0
Needs Pictures Needs Pictures:  0
Picture(s) thanks Picture(s) thanks:  0
Page 1 of 2 12 LastLast
Results 1 to 15 of 16
  1. #1
    Join Date
    Apr 2009
    Location
    Kingswood
    Posts
    422

    Default Another Piece of Black Bar Into the Scrap Bin

    The photo shows some black bar with longitudinal striations.
    The bar was sourced from a TAFE ex-student test-piece scrap bin.
    Perhaps the TAFE is where suppliers unload below specification import bar.
    This has occurred before but I just needed some simple washers and I 'thought' I might get away with it.

    Black Bar Striations.jpg

    I will have to raid my stock of 1214.
    John.

  2. # ADS
    Google Adsense Advertisement
    Join Date
    Always
    Location
    Advertising world
    Posts
    Many





     
  3. #2
    Join Date
    Feb 2006
    Location
    Perth
    Posts
    27,757

    Default

    That'll teach you to go scrounging in scrap bins!

  4. #3
    Join Date
    Jun 2012
    Location
    SA
    Posts
    1,478

    Default

    Ha Ha that's about right.

    Real crap, that stuff.

    Nothing wrong with scrounging in scrap bins.

    Met some of my best friends there.

    Hungry Bear steals restaurant bin!!! Very Funny - YouTube

    Now if only I could train my dog to do that.

    Rob
    The worst that can happen is you will fail.
    But at least you tried.



  5. #4
    Join Date
    Jan 2011
    Location
    Far West Wimmera
    Age
    63
    Posts
    2,765

    Default

    Couple of years ago there was some problems at work regarding the metal scrap bin because people were getting into it to get scrap out. I was not one of them although I got more metal scrap than all the rest put together. It is just a matter of using the brains you were supplied with at birth. I have secured some scap steel from TAFE bins many years ago. The bins were in a wide open public car park then. Now the TAFE has moved and everything is behind fences.

    Dean

  6. #5
    Join Date
    Jan 2004
    Location
    Mackay Qld
    Posts
    3,466

    Default

    Hi,
    Tafe is probably well aware of the crappy bar and perhaps may even acquired it for nothing. Bear in mind that, for Tafe this a fitness for purpose type application.

    In all likelihood the defect bar is most probably used in, say the Thursday high school class or the Prevocs first few times on the lathe.
    If the instructor can get the kids through the turning lesson so they are making chips are the correct form and the bar is turned to the nominated diameter the bar defects are of no consequence.

    You don't give em the good stuff until they can show competence in the basics. Believe me, some of these kids can't manage to get past the basics ,but expect to be put on a CNC or the like first up.
    You really have stand in the instructors shoes so to speak before making assumptions. Students in practice consume a great deal of materiel and given the sorry financial state of some of the Tafes I can well understand the reasoning.

    If I am after something I just ask one of the instructors nicely and have never been knocked back.

    Grahame

  7. #6
    Join Date
    Aug 2007
    Location
    Melbourne
    Age
    68
    Posts
    1,417

    Default

    Quote Originally Posted by electrosteam View Post
    Funny you say black steel, as that would suggest hot rolled/drawn steel, and I have never seen such defect on hot drawn/rolled steel.
    The cracks on the pic are typical for cold rolled steel, that has been drawn cold a few times too often between annealings. I have seen such cracks reaching deeper than 5mm under the skin. I was told it happens, when a mill in a low cost/quality country (like India) runs low on a certain size, and they decide to roll some larger surplus stock down a size or two on the quick leaving the annealing steps out. To make wheelbarrow axles it probably would not matter too much.... a good salesman may argue the cracks may even be beneficial to hold an oil reservoir )

  8. #7
    Join Date
    Feb 2006
    Location
    Perth
    Posts
    27,757

    Default

    Here's a dumpster diving story for you.

    At my former work place where there was another major building refurb happening and one of those high sided dumpsters was parked alongside a very busy thoroughfare where there was always a lot of foot traffic going past. When I looked into it the dumpster only contained a small mount of stuff but it (half a roll of 24V fire alarm cable, various lengths of 240V and Cat5 cable, a heap of ally angle and panelling, and boxes of tek screws) was just too good to leave there.

    Note: I'm dressed in fairly good clobber so I can't really climb up and into the dumpster.

    Meanwhile a guy I know who's also up for a bit of scabbing happens to be walking by and he comes over and has a look and then looks around an spies a bit of thin fencing wire in a nearby garden bed so he bends it into a hook and starts fishing out cat5 cable but he can't get at much else. Meanwhile the office ladies that know I'm up for dumpster diving are walking by on their way to lunch and all of them start talking very loudly. "IS THAT BOB AGAIN DUMSPTER DIVING" "GOOD ONYA BOB", "GO ON, GET IN THERE BOB" etc. Then 2 institutional gardeners drive up in one of their 4WD buggies and want to know what is going on. They are not interested in the stuff but are prepared to help so they lend me a hoe and I fish out most of the stuff. More people turn up for a sticky beak and the continuing commentary from the office ladies provides a few laughs.

    What I really want are the tek screws but they are hard to scoop out so one of the gardeners brings over a ladder. Urged on by the rabble I climb up and then jump in and get all the tek screws - then to get out I need the ladder on my side but one the office ladies takes the ladder away and a ransom situation ensues . . . . . . . Meanwhile one of the office ladies takes a photo of me in the dumpster , others pretend to show interest and some of them pick up my stuff and walk off with it. Then I have to make funny faces so they can photograph me appealing for the ladder back etc . . . . and of course it all ended up on emails that were circulated around the Department.

  9. #8
    Join Date
    Jun 2012
    Location
    SA
    Posts
    1,478

    Default

    Quote Originally Posted by BobL View Post
    Here's a dumpster diving story for you.

    <snip>

    Meanwhile one of the office ladies takes a photo of me in the dumpster , others pretend to show interest and some of them pick up my stuff and walk off with it. Then I have to make funny faces so they can photograph me appealing for the ladder back etc . . . . and of course it all ended up on emails that were circulated around the Department.
    Sounds like pay back time Bob.

    Any chance of seeing the photo's

    Rob
    The worst that can happen is you will fail.
    But at least you tried.



  10. #9
    Join Date
    Feb 2006
    Location
    Perth
    Posts
    27,757

    Default

    Quote Originally Posted by nearnexus View Post
    Sounds like pay back time Bob.

    Any chance of seeing the photo's
    I didn't keep any copies - only one of the office ladies is still there - I'll check if she has any.

  11. #10
    Join Date
    Jul 2006
    Location
    Adelaide
    Posts
    2,680

    Default

    Quote Originally Posted by BobL View Post
    Here's a dumpster diving story for you.

    At my former work place where there was another major building refurb happening and one of those high sided dumpsters was parked alongside a very busy thoroughfare where there was always a lot of foot traffic going past. When I looked into it the dumpster only contained a small mount of stuff but it (half a roll of 24V fire alarm cable, various lengths of 240V and Cat5 cable, a heap of ally angle and panelling, and boxes of tek screws) was just too good to leave there.

    Note: I'm dressed in fairly good clobber so I can't really climb up and into the dumpster.

    Meanwhile a guy I know who's also up for a bit of scabbing happens to be walking by and he comes over and has a look and then looks around an spies a bit of thin fencing wire in a nearby garden bed so he bends it into a hook and starts fishing out cat5 cable but he can't get at much else. Meanwhile the office ladies that know I'm up for dumpster diving are walking by on their way to lunch and all of them start talking very loudly. "IS THAT BOB AGAIN DUMSPTER DIVING" "GOOD ONYA BOB", "GO ON, GET IN THERE BOB" etc. Then 2 institutional gardeners drive up in one of their 4WD buggies and want to know what is going on. They are not interested in the stuff but are prepared to help so they lend me a hoe and I fish out most of the stuff. More people turn up for a sticky beak and the continuing commentary from the office ladies provides a few laughs.

    What I really want are the tek screws but they are hard to scoop out so one of the gardeners brings over a ladder. Urged on by the rabble I climb up and then jump in and get all the tek screws - then to get out I need the ladder on my side but one the office ladies takes the ladder away and a ransom situation ensues . . . . . . . Meanwhile one of the office ladies takes a photo of me in the dumpster , others pretend to show interest and some of them pick up my stuff and walk off with it. Then I have to make funny faces so they can photograph me appealing for the ladder back etc . . . . and of course it all ended up on emails that were circulated around the Department.
    you'll never catch me dumpster diving...i make sure no one is around

  12. #11
    Join Date
    Feb 2006
    Location
    Perth
    Posts
    27,757

    Default

    Quote Originally Posted by eskimo View Post
    you'll never catch me dumpster diving...i make sure no one is around
    The problem I had with the dumpsters where I used to work is that it was either the quick or nothing.

    One time there was a lot of "Stuff" in a dumpster and I decide to head out there at sparrow fart next day ( Saturday) so that there would be no one around as there was a heap of old electrical and electronic gear in there that I wanted to get a hold of and some of it would need to be taken apart as it was too heavy/big to carry out in one piece.

    As approached the dumpster I noticed that there was a car parked nearby and there was someone in the dumpster (but I couldn't see them) because every now and then "stuff" was being thrown out of the dumpster onto a tarp that was laid out on the carpark. Then I saw a wheelchair near the end of the dumpster.

    As I got out of the car the the throwing stop and I heard scrabbling in the dumpster and a head popped up over the side and said "Hello". The guy turned out to be a paraplegic who recycled electronic components and made specialised power supplies. He had a comprehensive set of tools with him including a gas torch to unsolder components from boards, and he said he had permission to be there. As the Head of the unit where all the gear had come from I knew nothing about it but it turned out he had asked the departmental senior techo which was fine. I asked him if I could help be he said he was "thanks but I'm good". I don't know how he did it , but I noticed he had managed to get a compact three phase transformer out of one instrument and the skip and into his car boot. At that point I did not have the heart to take anything so I left him to it. When I went back there in the afternoon there was very little left worth taking. Any I was happy the stuff was being reused.

  13. #12
    Join Date
    Jan 2011
    Location
    Far West Wimmera
    Age
    63
    Posts
    2,765

    Default

    On occasions at work we have a hook bin short term, for specific disposals usually after some form of construction. These bins have an end door which you can open up and walk in. Much easier.

    Dean

  14. #13
    Join Date
    Oct 2011
    Location
    sydney
    Posts
    880

    Default

    Hi,

    I've scavenged a heap of black bar from a welding shop, good for fab work but crap at machining. Still, it was free and its good for doing practice runs or things you don't need to worry about.

    I did just post this on the ebay thread:

    MILD Steel BAR ROD Scrap Lathe CNC Milling in Sydney, NSW | eBay

    When I'm at work I'm always bin diving and liberating anything I think I can use.

    Ben.

  15. #14
    Join Date
    Feb 2013
    Location
    Laidley, SE Qld
    Posts
    368

    Default

    Its not just low end steel that can suffer from striations. I was talking to a guy that runs a die shop recently, its one of those places where every piece of stock is tagged, no mystery hot rolled allowed in the shop thankyou very much. He was telling he found flaws in a piece of Bohler steel after they had quite a few hours in the piece. So I guess your chances of finding dud steel are increased at the low end of the market, but you can (very rarely) find dud steel at the top end.

  16. #15
    Join Date
    Jun 2012
    Location
    SA
    Posts
    1,478

    Default

    Quote Originally Posted by bob ward View Post
    Its not just low end steel that can suffer from striations. I was talking to a guy that runs a die shop recently, its one of those places where every piece of stock is tagged, no mystery hot rolled allowed in the shop thankyou very much. He was telling he found flaws in a piece of Bohler steel after they had quite a few hours in the piece. So I guess your chances of finding dud steel are increased at the low end of the market, but you can (very rarely) find dud steel at the top end.
    I was talking to a guy that made trailers one day about checker plate, and he told me they struck a sheet that tore a few teeth off of a metal cutting saw they used.

    Turned out the Asian checker plate had partly melted ball bearings in it.

    Great quality.

    Rob
    The worst that can happen is you will fail.
    But at least you tried.



Page 1 of 2 12 LastLast

Similar Threads

  1. More Scrap from Hughie
    By wheelinround in forum WOODTURNING - GENERAL
    Replies: 4
    Last Post: 21st April 2010, 06:03 PM
  2. Scrap turn
    By wheelinround in forum WOODTURNING - GENERAL
    Replies: 10
    Last Post: 12th December 2009, 08:03 PM
  3. Scrap bits
    By wheelinround in forum WOODTURNING - ORNAMENTAL TURNING
    Replies: 6
    Last Post: 8th July 2008, 08:31 PM
  4. scrap wood
    By sab in forum WOODWORK - GENERAL
    Replies: 22
    Last Post: 20th April 2006, 06:28 PM

Tags for this Thread

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •