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Thread: battery powered line bore machine

  1. #1
    Supporting Member Frank S's Avatar
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    battery powered line bore machine

    Everyone should know by my avatar that I have in the past done quite a lot of line boring on equipment. Using line boring machines that cost several thousands of dollars to a simple machine using a Do-More Virsi-mill a boring bar and a couple of bearings as my avatar suggests.

    Several years ago, I made a boring bar to bore out and excavator link on my lathe

    The other day a customer dropped off a Cat 420 backhoe badly in need of new main boom pivot bearings the locations were worn so I made a complete line boring machine for the task Starting with modifying the old boring bar I had previously used by turning one end down to accept 25mm bore bearings, then made a feed tube by threading a 2.375" 12 TPI thread along its length, and made a nut to serve as the feed nut.
    Once this was done, I welded a pair of flat bars with a hole in one end of them to one of the guide bearings I had made for the old boring bar 2 3/8" bolds would bolt the feed nut to the guide bearing then by rotating the feed tube the boring bar would be fed into the locations while the cutter bored them to size. to drive the line bore bar I selected a steering shaft from a Truck I have been paring out since the shaft had universal joints on either end, and a 6" telescopic spline To power the machine I had a 36VDC gear reduction motor salvaged from an old Tenet floor scrubbing machine. To power the motor, I first started out using may battery charger at its highest setting this worked but without a battery in the circuit I wasn't receiving the constant current I needed nor the RPMS I wanted as I was only able to supply around 18VDC, So I elected to forego the charger and used 2 group 31 truck batteries in series giving me a full 28 volts at full charge. this produced around 250 PRM cutter speed while hogging the cutter through the welded bores
    One nice thing about the machine is if using it in the field most heavy equipment has 24v systems a pair of jumper cables is all that is required to run the machine I made 6 passes through the 2 bores over a period of several hours and when finished the batteries were still at 90% charge

    battery powered line bore machine-img_20240427_144302lb1.jpg

    battery powered line bore machine-img_20240428_120607lb2.jpg

    battery powered line bore machine-img_20240428_161119lb3.jpg

    battery powered line bore machine-img_20240517_101405lb4.jpg

    battery powered line bore machine-img_20240517_101416lb5.jpg

    battery powered line bore machine-img_20240517_104134lb6.jpg
    I widened the notch with a grinder to accept a 1/4" bar to fit the keyway of the motor
    battery powered line bore machine-img_20240517_110057lb7.jpg
    I lengthened the slip tube to take full advantage of the shaft spline
    battery powered line bore machine-img_20240517_120609lb9.jpg
    I drilled a sleeve to adapt from the 3/4" motor shaft to the 15/16" of the splines on the u joint ends
    battery powered line bore machine-img_20240517_123749lb10.jpg
    battery powered line bore machine-img_20240517_131018lb11.jpg
    motor and drive shaft
    battery powered line bore machine-img_20240519_134248lb13.jpg
    view of cutter
    battery powered line bore machine-img_20240519_144736lb13.jpg
    feed disconnected to check cutter
    battery powered line bore machine-img_20240519_171649lb14.jpg
    feed connected rotating the feed tube was nearly effortless
    battery powered line bore machine-img_20240519_144726lb15.jpg

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  2. The Following 10 Users Say Thank You to Frank S For This Useful Post:

    baja (May 23, 2024), charles scozzari (May 23, 2024), cohay1 (May 27, 2024), ductape (May 23, 2024), Gadgeteer (May 25, 2024), Jon (May 22, 2024), mr mikey (May 23, 2024), papa bill2 (May 24, 2024), piper184 (May 23, 2024), Ralphxyz (May 23, 2024)

  3. #2
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    Thanks Frank S! We've added your Battery-Powered Line Borer to our Machining category,
    as well as to your builder page: Frank S's Homemade Tools. Your receipt:



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    Last edited by Jon; May 23, 2024 at 12:03 PM.

  4. #3
    Supporting Member marksbug's Avatar
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    there is a simple solution to most everything. and everything else use jb weld...or buff it out. my brother used to make all kinds of tools& jgs much better then mine and always eager to do them. me not so much. Ive made quite a few but very few were up to his standards as I only needed to do that one thing. and I dont quite have the perfection nack of making stuff like he does. to me it's usualy a lot of work to him it's fun. me I like looking at something thats done and perfecting it. good work and keep up the dooing. my dooer seems to be lost in the shuffle.

  5. The Following User Says Thank You to marksbug For This Useful Post:

    Frank S (May 23, 2024)

  6. #4
    charles scozzari's Avatar
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    Great work with what you have handy. Very nice work.

  7. #5
    Supporting Member Frank S's Avatar
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    here is a horrible video of my line boring machine in action
    Never try to tell me it can't be done
    When I have to paint I use KBS products

  8. The Following 2 Users Say Thank You to Frank S For This Useful Post:

    ductape (May 24, 2024), odd one (May 27, 2024)

  9. #6
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    ductape's Tools
    We've all seen more horrible and less useful videos than that one.
    Last edited by ductape; May 24, 2024 at 01:35 PM.

  10. #7
    Jon
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    Congratulations Frank S - your Battery-Powered Line Borer is the Homemade Tool of the Week!

    Excellent solution and money saver, and the ability to power it off of 24V adds to its versatility.

    Some more good builds from this week:

    Vise Hold Down Clamps by thehomeengineer
    Dog Hole Lamp Fixture by rod butler
    Workbench Drill Mount by orioncons36


    Frank S - you'll be receiving a $100 cash prize, in your choice of Amazon, PayPal, or bitcoin. Please PM me your current email address and prize choice and I'll get it sent over right away.

    This is your 14th Homemade Tool of the Week. Here are all of your Homemade Tool of the Week winning tools. Congrats again



  11. #8
    Supporting Member marksbug's Avatar
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    it works is all that matters. Ive seen and used line bore jigs that used a gear reduction unit for addvancing the shaft. but your works good and you can feed at the rate you want. sometimes ears are the best way to determan feed rates along you eyes with the chips.

  12. #9
    Supporting Member Frank S's Avatar
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    Quote Originally Posted by marksbug View Post
    it works is all that matters. Ive seen and used line bore jigs that used a gear reduction unit for addvancing the shaft. but your works good and you can feed at the rate you want. sometimes ears are the best way to determan feed rates along you eyes with the chips.
    Mark: you are correct nothing takes the place of listening and feeling the rate of cut especially when the cut is interrupted, and I am making a .250" total cut. It will almost self-feed, the large 12 TPI feed thread is smooth enough that the rotation of the shaft when spinning at around 250 RPM especially while the cut is still an interrupted cut on the weld beads creates vibration and just enough friction of the bearings inside to cause the feed to slowly advance.
    Never try to tell me it can't be done
    When I have to paint I use KBS products

  13. The Following User Says Thank You to Frank S For This Useful Post:

    marksbug (May 24, 2024)

  14. #10
    Supporting Member Frank S's Avatar
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    Thanks Jon, I had as much fun figuring out what I wanted to build it out of as I did building and running it.
    Never try to tell me it can't be done
    When I have to paint I use KBS products

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