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24th June 2013, 12:09 AM #1Senior Member
- Join Date
- May 2012
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- Melbourne, Australia
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- 200
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.
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24th June 2013 12:09 AM # ADSGoogle Adsense Advertisement
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24th June 2013, 08:26 AM #2Pink 10EE owner
- Join Date
- Aug 2008
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- near Rockhampton
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- 4,304
Twas good to see you get it done...
Light red, the colour of choice for the discerning man.
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24th June 2013, 09:17 AM #3Senior Member
- Join Date
- Oct 2011
- Location
- Newstead Victoria
- Posts
- 459
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.
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24th June 2013, 10:09 AM #4SENIOR MEMBER
- Join Date
- Oct 2007
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- Sydney
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- 2,340
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
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24th June 2013, 10:58 AM #5
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24th June 2013, 11:03 AM #6
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
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24th June 2013, 11:46 AM #7Mechanical Butcher
- Join Date
- Oct 2004
- Location
- Southern Highlands NSW
- Posts
- 920
For the tabs - roll pins? taper pins? countersunk bolts?
Jordan
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24th June 2013, 09:10 PM #8Senior Member
- Join Date
- May 2012
- Location
- Melbourne, Australia
- Posts
- 200
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.
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24th June 2013, 10:27 PM #9Senior Member
- Join Date
- Aug 2009
- Location
- Quindanning, WA
- Posts
- 175
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.
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24th June 2013, 11:26 PM #10Senior Member
- Join Date
- May 2012
- Location
- Melbourne, Australia
- Posts
- 200
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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