Eagle Mk3 surface grinder rebuild

  1. scottmk1

    scottmk1 Forum Supporter

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    1,361
    Location:
    Scotland
    I'll have to check mine and see if they changed the setup on later models. If not then I guess I've got another project to get some oil into my ones ways.
     
  2. Pete.

    Pete. Member

    Messages:
    9,335
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    Kent, UK
    If you do then make sure you stop a little shorter than I did so the cross-drill hole goes into that vertical rib, then you won't break through :thumbup:
     
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  3. scottmk1

    scottmk1 Forum Supporter

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    Yeh I'll keep that in mind.
     
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  4. ronan

    ronan Forum Supporter

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    9,773
    dublin
    Well done. On the J&S 540 i need to replace my cross feed screw and nut. Popes who stock the parts have them...........for nearly £600 ! Can i ask where you bought the acme inserts ?
     
  5. Pete.

    Pete. Member

    Messages:
    9,335
    Location:
    Kent, UK
    I bought the inserts from eBay, have 8 and 10tpi LH. I could let you havean insert if you need one Ronan though I'm unsure if it'll so down the bore of the nut.

    Your machine is an absolute sumbitch to do the cross slide nut on by the way. I had one that was badly worn and the nut & screw had been carrying the cross table weight.

    BTW You could look at this list for your thread size see if it's listed. The platform nuts are a lot cheaper than you're quoted.

    https://www.mcmaster.com/acme-nuts
     
  6. awemawson Forum Supporter

    I have a feeling that I have a brand new cross screw and nut for a 540 tucked away somewhere. I’ll have a look.
     
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  7. Hopefuldave Intergalactic pot-mender

    Messages:
    1,598
    Location:
    The Shed of Danger, surrey, England
    Thanks for the link, Pete - might have saved me screwcutting a LH 8 tpi internal Acme in bronze... or two if I want an anti-backlash nut? Cheaper than buying a tap, too...

    Dave H. (the other one)
     
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  8. Shox Dr

    Shox Dr Chief Engineer to Carlos Fandango

    Messages:
    15,260
    Location:
    East Yorkshire
    RDG tools have a large selection of Acme taps. Prices aren’t daft either. Use it sell it on.
     
  9. Hopefuldave Intergalactic pot-mender

    Messages:
    1,598
    Location:
    The Shed of Danger, surrey, England
    I've been watching them, 5/8 8tpi left-hand have been permanently out of stock since I started looking 4 years ago... Must be popular?

    Dave H. (the other one)
     
  10. Shox Dr

    Shox Dr Chief Engineer to Carlos Fandango

    Messages:
    15,260
    Location:
    East Yorkshire
    Come to think of it when I needed a one for my m300 they had no stock. So I used 1605 ball screw instead.
     
  11. pressbrake1

    pressbrake1 Forum Supporter

    Messages:
    2,415
    essex england
    They’re impressively low quality
     
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  12. mtt.tr

    mtt.tr Member

    Messages:
    2,946
    Essex England
    Rather just single point turn one. Actually that is exactly what i do!
     
  13. ronan

    ronan Forum Supporter

    Messages:
    9,773
    dublin
    Like a lot of rdg's products.
     
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  14. pressbrake1

    pressbrake1 Forum Supporter

    Messages:
    2,415
    essex england
    Rdg , a more expensive lower quality version of bang good
     
  15. Shox Dr

    Shox Dr Chief Engineer to Carlos Fandango

    Messages:
    15,260
    Location:
    East Yorkshire
    Tracey Tools list them
     
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  16. Pete.

    Pete. Member

    Messages:
    9,335
    Location:
    Kent, UK
    So do I but this isn't exactly a trivial exercise.
     
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  17. Pete.

    Pete. Member

    Messages:
    9,335
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    Cross slide nut is all done. Turned out to be an easier job that I thought it would be.
    I ground a cutting bit from an old 6mm carbide end mill and turned a piece of tough steel down for a boring bar.

    LH ACME tool.jpg

    Cut a small relief groove in the end of the nut, just as a visual guide as much as anything. Also checked I had clearance all along. I'd allowed 12 thou (0.3mm).

    Eagle y axis nut 3.jpg

    Happy with that I cut the thread in 5 thou passes.

    Eagle y axis nut 4.jpg

    The screw fits really nice and snug, turns smooth too.

    Eagle y axis nut 5.jpg

    Nut ready to go in the holder tomorrow.

    Eagle y axis nut 6.jpg
     
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  18. Richard.

    Richard. Forum Supporter

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    18,347
    Location:
    Cambridgeshire
    Just read start to finish.
    Wonderful job Pete. Very nice work :cool:
     
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  19. Pete.

    Pete. Member

    Messages:
    9,335
    Location:
    Kent, UK
    Thanks Richard :thumbup: Not done much this week but I have got some progress.

    As I suspected would happen, scraping 12 thou off the bottom of the table and probably 4 or 5 from the top of the cross-slide has caused the table to ride on the gear and rack rather than the ways. Here you can see the gap both sides.

    table rack adjust 1.jpg
    table rack adjust 2.jpg

    This might be the reason the machine was taken out of service because of course I only took that much off the ends, the middle was already that low.

    I put feeler gauges under the table until they were lightly pinched both sides. I did this right opposite the traverse gear that was holding it up.

    table rack adjust 3.jpg

    The fix was simple enough, I just machined 15 thou off the spacers for the rack. Effectively lifting the rack up off the gear.

    table rack adjust 4.jpg

    Once I did this there was no more constant interference but there was a 'lumpiness' caused by some ham-fisted removal of the gear previously. The corners had been beat up a little by someone using too hard a drift. They had attempted to dress it with a file but not very successfully. I put the gear in my lathe and turned the corners off. After that the table travel was perfect.
     
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  20. Pete.

    Pete. Member

    Messages:
    9,335
    Location:
    Kent, UK
    Did some painting today. I found that you cannot brush paint enamel over yellow filler primer because the enamel paint melts the primer and you get a sickly grey-yellow mix as a result :(

    I also made some new felt oilers for the table. The old ones were rock hard and made a noise like a dropped dice. I only had 4mm thick felt so I had to cut two per well and spilt one in half. Thankfully they peeled apart easily.

    Eagle felts 1.jpg

    Eagle felts 2.jpg

    Then my heart sank when I noticed this:

    Eagle x axis gib 1.jpg

    Yes, the bloody table is riding on the top of the gib slightly. There's a small lip just above the dovetail and I've used up all the clearance.So sometime this week the gib is going to have to come off so I can mill a few thou off the top (or I'll have to set up the fly cutter and cut the lip some more). Then I'll have to re-adjust the whole lot again. Oh well, onwards and upwards!
     
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