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Thread: Homemade lathe in the making?
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6th Apr 2020, 02:23 AM #46Most Valued Member
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Shed interesting i only found one homemade boring machine
https://youtu.be/7nSlBEV-y48
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6th Apr 2020, 03:37 AM #47Most Valued Member
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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
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6th Apr 2020, 03:37 AM #48China
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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
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6th Apr 2020, 05:57 AM #49Senior Member
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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
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6th Apr 2020, 06:05 AM #50Most Valued Member
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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
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6th Apr 2020, 10:10 AM #51Most Valued Member
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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...
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6th Apr 2020, 10:38 AM #52Most Valued Member
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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
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6th Apr 2020, 11:08 AM #53Novice
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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.
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6th Apr 2020, 11:08 AM #54Most Valued Member
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Tensile strength has nothing to do with a shaft being concentric or parallel.
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6th Apr 2020, 11:11 AM #55Most Valued Member
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6th Apr 2020, 11:18 AM #56Diamond Member
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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.
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6th Apr 2020, 12:11 PM #57Most Valued Member
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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
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6th Apr 2020, 12:57 PM #58Novice
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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
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6th Apr 2020, 01:20 PM #59Most Valued Member
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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.
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6th Apr 2020, 03:25 PM #60Member
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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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