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  1. #1
    Join Date
    May 2012
    Location
    Melbourne, Australia
    Posts
    155

    Default Put My First Line Boring Job on Youtube

    Put my little excavator out of action to do some line boring on its swing tower. I've watched a lot of line boring videos on Youtube but none really explained much. Lots of pictures of the bar going round........and round........and round, you know what I mean.

    MY FIRST LINE BORING JOB 1 - YouTube

    So for anyone interested I thought I'd give a talk through my first nervous attempt, which ended up going very well thank God. I hope I manage to give some new info to anyone interested in this subject.

    I've certainly learnt a bit more about cast iron, namely ductile iron or malleable iron, which are high strength types of cast iron, and even replace cast steel in high stress situations. Found out my swing tower was ductile iron AFTER I welded on it. Good job I couldn't build the bores up with weld or I would have tried to and been in a world of hurt.

    Sorry about my voice though, probably not the most exciting one around LOL.

    Keith.

  2. #2
    Join Date
    Aug 2008
    Location
    near Rockhampton
    Posts
    6,224

    Default

    Twas good to see you get it done...
    Gold, the colour of choice for the discerning person.

  3. #3
    Join Date
    Oct 2011
    Location
    Newstead Victoria
    Posts
    459

    Default

    Nice job there Keith just goes to show what can be done with some thought and basic expertise.Get lots of those things walk in here some times.lots of L N E here coming up with a solution.[Late Night Engineering]
    Thought of drilling and tapping the housing for the pin locators and bolt on a piece of flat parallel to straight piece on the pin plate in flush so eliminates rotation just a thought. Do I detect a bit of Irish mother tongue??? Well done.Seen some of those housings well shagged out 10mm slop in ovality and worse. Cheers John.

  4. #4
    Join Date
    Oct 2007
    Location
    Sydney
    Posts
    3,112

    Default

    Nicely done Keith and thanks for sharing those tips. I'd be keen to see a final episode showing the finished result back on the machine with it in operation, how tight it all finished up, and any final comments as to what you may have done differently if you needed to do it again.

    Pete

  5. #5
    Join Date
    Jun 2008
    Location
    Lindenow
    Age
    50
    Posts
    869

    Default

    Quote Originally Posted by j.ashburn View Post
    Nice job there Keith just goes to show what can be done with some thought and basic expertise.Get lots of those things walk in here some times.lots of L N E here coming up with a solution.[Late Night Engineering]
    Thought of drilling and tapping the housing for the pin locators and bolt on a piece of flat parallel to straight piece on the pin plate in flush so eliminates rotation just a thought. Do I detect a bit of Irish mother tongue??? Well done.Seen some of those housings well shagged out 10mm slop in ovality and worse. Cheers John.
    Sounds almost like a Manchester accent to me

    Also as I have done with all members here I have subscribed to your channel.
    Well done Mate.
    Matt
    Warning Disclaimer

  6. #6
    Join Date
    Feb 2009
    Location
    moonbi nsw Aus
    Age
    69
    Posts
    364

    Default

    Well Kieth
    I am totally impressed with your solution to an otherwise costly repair. I was really surprised to see a hand drill as the power plant. You are showing the resourcefulness of a Jordy (from the north of England). The skills you are exhibiting are what has made Australia what it is today! I can imagine our early pioneers that were faced with a problem would have nutted out a solution using the basic gear they had around them.

    Ant moving parts on any earth moving machine have to operate in what is a hostile environment due to the abrasive nature of the material being worked in. I dare say that this line boring set up may have to be repeated as time goes by.
    Just do it!

    Kind regards Rod

  7. #7
    Join Date
    Oct 2004
    Location
    Southern Highlands NSW
    Posts
    1,910

    Default

    For the tabs - roll pins? taper pins? countersunk bolts?

    Jordan

  8. #8
    Join Date
    May 2012
    Location
    Melbourne, Australia
    Posts
    155

    Default

    Lads, lads, stop it, you are making me blush

    Seriously though thanks so much for the supportive comments. It is nice to get a pat on the back after the amount of crapping myself with worry that I was going to stuff it up.

    The accent is from a little coal mining village in the north east of England, the closest big city is Newcastle. Back home I'm known as a Pit Yakker. Funny thing is I only learnt the meaning of the word yakker when I came to Australia, how crazy is that, I now know that I was always called a pit worker, ha ha. On a bigger scale though we generally get called Geordies (you got it Chambezio) but someone from Newcastle might get very upset about that.

    To be honest I only copied what I have learnt from watching lots of Youtube videos and forum threads. I've been Googling the subject on and off for at least two years. Took bits and peices from all of them to do my poor mans setup.

    What would I do differently next time ? First of all not crap myself so much, my confidence level has jumped a lot since this first experience. I'd make an additional HSS edge chamfer toolbit to give a slight taper entry for where the sleeves enter. I'd clamp wherever possible even on steel because it makes the dismantling process easier and quicker but I'd have to be sure everything is rock solid, can't have anything moving after it's started. There'd be no cutting, grinding and painting to do afterwards. Can't think of much else off the top of my head, although if I had the time and money I'd love to design and machine up a "real" line boring kit, with stepper motor variable feed control, zero backlash feedscrew, and even stepper motor for the main drive (there's pretty chunky ones available). I'd love to machine up an adapter for my mig so I have bore welding facilities too (stepper control once again). As it is I'm sitting here going broke and there's hardly any cash in the bank, excavation has gone dead and I think everyone is holding onto their dollars at least till election time. I'll end up selling the excavator and bobcat at this rate just to survive (let me know if there's any jobs going anywhere by the way, I even used to be an oilfield sparky, stupid me).

    For the pin tabs I didn't have time to do my wedge method so just bolted them down tight with star washers for a bit of grip. However on a couple of other pins I cut out 5 mm thick tabs on my cnc plasma and have a rectangular hole where the fixing bolt is. I took a square bit of about 8mm thick steel, and ground tapers on 2 opposite edges, then drilled a hole the same size as the bolt. This wedge piece pulls in tight to the edges of the rectangular hole in the tab and seems to hold it really solid.

    I tried as hard as I could to rock the swing tower and feel even a tiny bit of play and couldn't get a tiny bit. Can't see that lasting long though, being in an earthmoving environment. I've got a lot more bosses (+pin & bush replacement) to do but I've just thrown my hands up in the air at the moment because I won't be surprised if I end up putting the machines up for sale just so I can pay the mortgage. So much for surviving the GFC. Feel like I'll get most of them done then sell the machine and someone gets the benefit.

    A note on the HSS toolbit I used for the roughing out. I tried once just pushing a boring bar through by hand instead of the screw feed in the video, and the tool bit just dived in and grabbed solid. So with that experience I ground the toolbit with less releif on the front and more on the top. My guessing is that this will help stop the toolbit biting in and will require some continuous push to make it cut seemed to work fine. The feed mechanism was completely loose and has nothing stopping the toolbit if it wanted to dive.

    Cheers,

    Keith.

  9. #9
    Join Date
    Aug 2009
    Location
    Quindanning, WA
    Posts
    175

    Default

    Great work... I'm very impressed with you set up. I did something similar a few years ago to finish the pin bosses on for a rock breaker top mount i made, but my setup was far cruder than this. I was surprised how simple a set up i was able to get away with.

    I have also been thinking about making a better rig as i think i'll need to do some boring when i get around to fixing all the sloppy pins on my machine. My pins are a bit bigger so I didn't have any success with a hand drill so i'm thinking of making a reduction drive using a motor and pulleys like a drill press... Project 5782 on the to do list.

  10. #10
    Join Date
    May 2012
    Location
    Melbourne, Australia
    Posts
    155

    Default

    Quote Originally Posted by gallegos View Post
    Project 5782 on the to do list.
    Ha ha, I know exactly what you mean, there truly is no end to this workshop and machining game. One idea leads to anther idea leads to another idea...................... Druggies are not the only ones with addictions.

    The one tool I wish I could build is add-on arms for myself. I truly envy an octupus, I mean how many times have you needed at least four arms at the same time.

    Keith.

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