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  1. #46
    Join Date
    Aug 2009
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    Sydney, NSW, Australia
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    Shed interesting i only found one homemade boring machine

    https://youtu.be/7nSlBEV-y48

  2. #47
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    Aug 2009
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    Sydney, NSW, Australia
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    came up with this little drawing this may be a suitable thing to build, a steel box that the boring bar drops down thru, what bearings would i use for something like this? the black outer line will be a 10mm steel box the grey line in the middle is a shelf to house another set of bearings to guide the shaft, box will be 300mm square open front
    Attached Images Attached Images

  3. #48
    Join Date
    Dec 2005
    Location
    South Australia
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    Gazza that is interesting, I have never looked them up as having operated one for 18 months I would not want one even if it was being given away for free believe it or not
    the are manufacturers that are far below the stuff that comes out of China and in my opinion Agami is one of them

  4. #49
    Join Date
    Aug 2011
    Location
    Perth, Western Australia
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    67
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    362

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    Reminds me of the single leg boring machine I have seen. Use to sit them on the engine block and bore one cylinder at a time.
    Might have even had the Repco name on one of them.

    Tony

  5. #50
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    Aug 2009
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    Sydney, NSW, Australia
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    Anyone got opinions on the box idea? I looked up bearings and 6206 bearings came up for radial and axial forces they have a 35mm ID so i can use a 35mm CrMo shaft, bears were i think 17mm wide so looking at using 6 bearings inline for the lower shelf and 6 bearings on top the bearing sleeves will be machined of steel than welded to the top and shelf bearings can be pulled out for replacement

  6. #51
    Join Date
    Mar 2011
    Location
    Southern Flinders Ranges
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    1,536

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    Again, it’s a primitive solution unless you build it properly. As Elan already explained, round bar isn’t. With that design you would need to build it to accept an adjustable boring head, a regular boring bar doesn’t have the required level of adjustment available for the accuracy required.
    Seriously, just buy the right equipment...

  7. #52
    Join Date
    Aug 2009
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    Sydney, NSW, Australia
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    Racing i understand the whole boring thing that is why im drilling out a morse taper 2 on my lathe in the shaft to fit a mt2 boring head, the shaft is high tensile, the bearing arrangment will be 160mm of stacked 6206 bearings rated for axial and radial loading my current cylinder will be the guine pig for testing

    All the steel has been bought

  8. #53
    Join Date
    Sep 2014
    Location
    SA
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    11

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    Why not just take the cylinder to a machine shop and get it bored out properly? Seems like lots of money to spend building something to then have to spend more to do the job properly later after you have destroyed the part you're trying to fix.

  9. #54
    Join Date
    Mar 2011
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    Southern Flinders Ranges
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    Tensile strength has nothing to do with a shaft being concentric or parallel.

  10. #55
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    Mar 2011
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    Southern Flinders Ranges
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    Quote Originally Posted by S.W View Post
    Why not just take the cylinder to a machine shop and get it bored out properly? Seems like lots of money to spend building something to then have to spend more to do the job properly later after you have destroyed the part you're trying to fix.
    Go read the Cinese Lathes thread in the General area

  11. #56
    Join Date
    Aug 2019
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    Revesby - Sydney Australia
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    56
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    1,183

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    Quote Originally Posted by bts View Post
    Reminds me of the single leg boring machine I have seen. Use to sit them on the engine block and bore one cylinder at a time.
    Might have even had the Repco name on one of them.

    Tony
    Haven't seen a Repco one, but here are two different sized ones from my factory neighbour's shop:

    IMG_0612.jpg IMG_0613.jpg IMG_0614.jpg


    The small (red) one does Austin 7s, Rileys, et c.

    Bigger one suitable for V8s, boat diesel engines.

  12. #57
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    Aug 2009
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    Sydney, NSW, Australia
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    Guys im giving it a go i may fall but i'll get up again, if i succeed its a win for me i like to build stuff

  13. #58
    Join Date
    Sep 2014
    Location
    SA
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    11

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    Quote Originally Posted by racingtadpole View Post
    Go read the Cinese Lathes thread in the General area
    not sure what the chinese lathes thread has to do with my reply... I was suggesting that Gazza should take the engine that he wants to bore out to and machine shop/reconditioner and have them do the job for him on the correct machinery. Spend the $500 on something that will achieve the desired, not a homemade lathe that won't work and then have to spend more to get the job done properly and have to buy the engine parts that have been destroyed in the process

  14. #59
    Join Date
    Apr 2012
    Location
    Healesville
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    2,129

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    Quote Originally Posted by gazza2009au View Post
    Guys im giving it a go i may fall but i'll get up again, if i succeed its a win for me i like to build stuff
    gazza before you start you need to put pencil to paper, as your design proceeds you need to evaluate the required materials tools and machinery for each fabrication and machining process for each part.
    Some things to consider...
    Off the shelf brgs for the spindle wont be accurate enough.
    Mass and rigidity will be high on the list.
    Sliding shafts will need to be stress relieved before any machining then ground as the final process.
    You will need to dust off your surface plate and precision square.
    Are you going to use an all thread shaft and a nut for the feed or something more elaborate?
    A mate recently sold his fishing boat for 80 g's, how much is yours worth? In the supermarket you can buy fish cheaper than fuel and not have waste time dangling hooks in the water, so if you can flip that and get a milling machine or even a decent
    lathe then you will solve many problems.

  15. #60
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    Mar 2012
    Location
    adelaide
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    91

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    I am following this out of interest, if you are wanting to bore cylinders ,you don't need a lathe, a boring machine is what you after, motorcycle cylinders are usually done a flip over jig then a boring machine of your choice is entered on the other side , there are also "table" like machines were the top is a ground surface the cylinder clamped to the top and the machine draws down, either way with your $500 budget it would be cheaper to pay for the work you want, at the end of the day do you want to rebuild your bike or do you want to build machines, these are 2 different ventures, but i think you are under estimating the level of precision need to build a serviceable machine

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