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Type: Posts; User: ballen

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  1. Replies
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    What's your budget? Is this for "production" use...

    What's your budget? Is this for "production" use in runs of tens or hundreds or more? Or for one-offs?
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    765

    60 rpm... what’s the DOC? Sent from my...

    60 rpm... what’s the DOC?


    Sent from my iPhone using Tapatalk
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    765

    Ross, I'm amazed that you can cut a smooth bore...

    Ross, I'm amazed that you can cut a smooth bore at that extension, and also that it's possible to line everything up with such poor access. The time spent setting up and making custom tooling must be...
  4. Replies
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    2,303

    Exactly, it's at most a few hours of lathe work. ...

    Exactly, it's at most a few hours of lathe work. I think Karl (CharlyDE on the forums here) had a source for these metric Acme screws with accuracy 0.03mm over 300 or 400mm. I suggest you ask him,...
  5. OK, makes me feel better to know that. ...

    OK, makes me feel better to know that.



    That's a good idea. The next couple of yard sale squares are going to make one of these for my lathe and one for my circular grinder.
  6. Replies
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    In the days before the DRO, it was important that...

    In the days before the DRO, it was important that these screw threads be very precise -- better than 0.01mm accuracy everywhere along the screw. Otherwise the positions that come from the handwheel...
  7. How to center a part on a circular magnetic chuck?

    What's the right way to center parts on a circular magnetic chuck like this:

    https://www.practicalmachinist.com/vb/attachment.php?attachmentid=290334&d=1591006000

    Only way I could find was to...
  8. Replies
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    2,303

    Peter is a pro and sees and fixes a lot of these...

    Peter is a pro and sees and fixes a lot of these machines. So when he says it is problematic, there's a good reason.



    First, that bearing never turns faster than the lead screw nut, perhaps...
  9. Replies
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    1,455

    I've shipped a lot of stuff to to the US over the...

    I've shipped a lot of stuff to to the US over the years, and try to find good prices. But I have never found a way to ship a 100+ kg object from the UK to the US by air in a week for $300...
  10. Replies
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    I think Peter is correct about all points. The 3...

    I think Peter is correct about all points. The 3 setscrews in the flange are there to take up any play in the thrust bearing behind the flange. I would leave very little clearance in that bearing. ...
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    Street -- thanks for the suggestions regarding...

    Street -- thanks for the suggestions regarding gluing stones. I have used cyanoacrylate glues with glass-sphere fillers before. Did not think about using them for this. Would be grateful for a...
  12. I needed to align the axis of the inside grinding...

    I needed to align the axis of the inside grinding spindle to be parallel to the long traverse axis in both the vertical and horizontal directions. Since this required disassembly and careful...
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    979

    I adjusted the ID grinder so that the spindle...

    I adjusted the ID grinder so that the spindle axis is parallel to the long axis travel in both the vertical and horizontal planes. I now get a nice cross-hatch pattern!
    ...
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    1,455

    I got a quote once from JFA for resurfacing my...

    I got a quote once from JFA for resurfacing my 800x1200 mm surface plate. It was more expensive than a brand new laboratory-grade plate from another well-known manufacturer!
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    395

    How to tighten loose test indicator probe

    One of my favorite test indicators (Käfer, long probe, big dial, 0.01mm/division) was given to me a few years ago by a friend, who rescued it from the trash at work. It had been tossed because it...
  16. Postmorten: were the broken wires the origin of...

    Postmorten: were the broken wires the origin of the problem? Did they indeed break because of fatigue? Have you found a way to mount/support the wires so that any flexing now takes place in the...
  17. Replies
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    Hi Matt, For something like this, which...

    Hi Matt,



    For something like this, which might just be "tuning" I would agree that a 5% voltage variation (say 23 or 25 V instead of 24) should not matter. But a 20% difference (20V vs 24V)...
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    Zach, Peter, Buck, Thanks for the advice. I...

    Zach, Peter, Buck,

    Thanks for the advice. I turned and threaded a "bolt" to hold it on. This is a good fit in the stone, but not tight, same for the portion that goes into the arbor:
    ...
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    I think that's wise. You need to get the machine...

    I think that's wise. You need to get the machine in use so that you can identify any other significant problems.
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    How should I mount this grinding stone?

    I've added a swing-down ID grinding spindle on my cylindrical grinder and am slowly learning how to use it, mostly by trying things.

    I would like some advice about how to mount this stone (30mm...
  21. Replies
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    If this is the same as an earlier FP2, the...

    If this is the same as an earlier FP2, the bearing on the main input pulley shaft can be removed from the back. You either need to disconnect the vertical shaft which provides power feed to the Y...
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    Alternatively put petroleum in the gearboxes, run...

    Alternatively put petroleum in the gearboxes, run it for a few minutes, drain it, and fill with fresh oil. If it then works well and isn't noisy, a more detailed investigation could wait.
  23. Replies
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    Hi Dave, Congrats on getting your J&S540...

    Hi Dave,

    Congrats on getting your J&S540 running well. I have a similar machine.



    You will now find yourself putting a ground finish on all sorts of things that don't really need it. But...
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    If that's a standard SK40 taper (I think 7:24)...

    If that's a standard SK40 taper (I think 7:24) then it might be possible to purchase an SK40 backing plate and easily adapt it to the dividing head.
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    I believe that David Samways, the owner of the...

    I believe that David Samways, the owner of the web site Anglo-Swiss Tools - Anglo-Swiss Tools, has restored a Schaublin 13. You can find a short video from him here YouTube . There is also quite a...
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