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Thread: Linisher Score

  1. #1
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    Default Linisher Score

    Today I picked up a bunch of old 3 phase machines at an irresistible price.
    The upright MetalFast metal cutting bandsaw and 6" jointer when to our local men's shed while I kept the Italian linisher.

    The linisher is an unusual size - the belt on it is 150mm wide x about 1.6m long but it doesn't look like it will be too difficult to extend the outboard end to take a 2 m long belt.

    Linisher Score-img_4157-jpg

    The disc is 12" which is a good size.
    Motor-wise, it's a rugged 3 phase two speed YY/∆ motor, 1440/2800 rpm, 2.5/5 HP jobbie, so some surgery using my newly acquired motor surgery skills and VFD installation will be needed.
    Dust extraction will need upgrading as well.
    It comes with all the extras (fences, tables and brackets) and it looks like to be all there.
    Linisher Score-img_4159-jpg

    Now where the %*$#%$ do I put it!
    Attached Images Attached Images

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  3. #2
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    Good score Bob


    Pete

  4. #3
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    What a nice machine! But Bob, you're killing us --- whadya pay for it!!!!!
    Warm Regards, Luckyduck

  5. #4
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    Quote Originally Posted by LuckyDuck View Post
    What a nice machine! But Bob, you're killing us --- whadya pay for it!!!!!
    All the machines were freebies. The previous owner (who also picked them up for nothing) had them in storage for a couple of years and said it was unlikely he was ever going to use them so he was glad they were going to a good cause.

  6. #5
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    Quote Originally Posted by BobL View Post
    Now where the %*$#%$ do I put it!
    My place



    Nice score
    Every time you make a typo, the errorists win.

  7. #6
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    Woohoo Bob. Well done!
    Warm Regards, Luckyduck

  8. #7
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    I just started tearing it down and took the old sand paper of the ally backing disc and there's a surprising amount of pitting/corrosion on the backing disk - it looks like the disc has been used to sand something like chalk or plaster? The pitting may cause probs for the balance of the disc so I think I might get some metal filled bog to fill these holes.

    Then I tried to get the backing disc off the shaft but I snapped the head off the locking grub screw so that's going to be a screw extractor job.
    At the other end of the shaft the allen head screw locking the drum came out OK (I was worried that it might have been a LHT!) but the drum is "tight as a drum" on the shaft. Neither of my pullers are long enough to reach down into and over the drum to grab the drum so I might have to make a special puller to get it off.

    I thought this was going to be relatively simple but Hey, it's going to be more fun than I thought!

  9. #8
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    Thumbs up

    No doubt about it Bob, you are like the Mapleman of 3Phase machinery!!!

  10. #9
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    Quote Originally Posted by artme View Post
    No doubt about it Bob, you are like the Mapleman of 3Phase machinery!!!
    Not really, I haven't been into small 3 phase stuff for that long and have just realised how little I do know. I just like learning new stuff all the time.

    I had to make long-reach, long-thread puller to get the drive drum off which worked out fine. Then to get the disc off I used a screw extractor but first I had to drill a hole in the 8 mm grub screw I had sheared the head off so I could fit the screw extractor into it. Problem here was the grub screw was very close to the back of the disc and even my along bits where not long enough to allow me to drill vertically into the top of the grub screw so I had to make a bit extension - it all worked out and now I have the naked motor on the bench ready for some VFD-ing trials.

    I see I wrote in my first post that the motor was a 2.5/5 HP, that should be 2.5/3 HP.
    Well, time to go get out my meters and rubber gloves.

  11. #10
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    Hooked it up on the Delta connection and it generates 2980 rpm (supposed to be 1400 rpm).
    This has me confused, I definitely have it powered on the right connections - I wonder if the thing is wired the wrong way around?
    Wish I had a small dyno to check what it's outputting

    Otherwise it's nice and quiet, unlike some of my other motors theres on chirping and squeaking from the VFD either.
    I might just leave it and see what it can do on the belt sander.

  12. #11
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    Quote Originally Posted by BobL View Post
    Hooked it up on the Delta connection and it generates 2980 rpm (supposed to be 1400 rpm).
    This has me confused, I definitely have it powered on the right connections - I wonder if the thing is wired the wrong way around?
    I just swapped over the connections and sure enough the thing is not wired accordion to the information on the machine.
    Using the so called YY connection gives 1490 RPM while the so called ∆ connection gives 2980!

    Bloody Italians! ('saawright I'm Italian !)

  13. #12
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    Default Cleaning up the disc

    I've been cleaning up the big disc. It seems more elaborate than I have seen before and am trying to work out how it works.

    A is the main backing plate which has the collar in it that attaches onto the motor shaft

    B is a secondary backing plate that screws onto the middle of the shaft but sits a few mm above A.
    B is prevented from rotating relative to A by two studs opposite each pother at about the half radius point.
    The studs are attached to B and pass through holes in A
    The screw that hold B onto A appears to be spring loaded.

    C is a felt pad that sits on top of B and immediately underneath the sanding disc.

    Finally a large locking ring covers the outer 5mm of the sanding disc and is screwed onto the backing plate from behind.

    It looks like B is not a hard surface but has some give in it.
    Has anyone seen one like this and knows what's going on?

    Thanks
    Linisher Score-img_0949-jpg
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  14. #13
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    Not real sure what the idea is there Bob, but if I was to hazard a guess it might allow the B,C and D part to be removed from the machine which then allows a change of sandpaper with relative ease, or maybe a quick change of multiple discs with different grits ready to go, or some without felt backing and some with, maybe,
    I have a sanding disc that was an optional extra for the old Durden, contact adhesive is the method of attaching, no quick change there
    Was it made pre hook and loop as we see on sanding discs today?
    The quality of the machine build sometimes can give an indication whether it is a budget machine (glue on discs) or better quality machine therefore better quality options, once again just a maybe
    D captures the outer edge of the disc, this outer edge seems to be a vulnerable area of a glued on/hook and loop/center fixing method of attaching discs to backing pads, always seems to start shredding or tearing from the outer edge first, your disc would not allow this




    Pete

  15. #14
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    Thanks Pete,

    Contact Adhesive, or hook and loop, direct onto the backing disc is what I'm used to.

    On this linisher It's not exactly a rapid grit changing system with 6 screws needing to be removed to remove the outer rim so I wouldn't want to be switching grits in a rush.

    The used of a second sprung plate looks like some sort of suspension system - I haven't been able top try it out as I need to check out the motor on 240V 3phase via a VSD which I have done yet but the whole thing is now in pieces so it'll have to wait till it's back together.

  16. #15
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    Humm, yes six screws to remove would seem to be a non quick change system, I was thinking maybe part of a turn and it's off, Would some hook/loop (whichever) contacted onto the Disc B work as a quick change system, that is if you want a quick change, to alleviate the need to remove the six screws you could size it to fit inside the ring, mmm as I'm typing Y bother with all that, just hook/loop straight onto disc A might seem to be the simple option apart from maybe the suspension system being of some as yet unknown benefit



    Pete

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