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  1. Replies
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    The 6300 spindle gets the added RPM's from a 1:2...

    The 6300 spindle gets the added RPM's from a 1:2 speed increasing gear that resides in the upper portion of the "Y" slide.
    Believe the lower portion is essentially the same as the earlier 3150...
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    All the more reason to run them straight...easier...

    All the more reason to run them straight...easier to gauge if the parts are sitting straight with the machine....could even indicate them if needed.
    Simpler, less chance of any error, and easier to...
  3. Ampco 18 is fine as well..... Would suggest you...

    Ampco 18 is fine as well.....
    Would suggest you direct teh owner to PEP.
    They make custom guides as a business....
    Precision Engine Parts - PEP - Las Vegas, NV
    Cheers Ross
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    Not sure you have the travels to run this...

    Not sure you have the travels to run this diagonally...Looks close to me.
    Seems as you will need a minimum of 440mm of cross travel to fit your length if your "X" has 550mm travels. (not sure...
  5. Would not use 660....for valve guides unless this...

    Would not use 660....for valve guides unless this going into an open valve gear style engine T or F head (no splash oil on the top)...
    For oil lubed valve gear think the 660 is too soft.
    Would...
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    584

    Easier to make the unknown steady fit the lathe...

    Easier to make the unknown steady fit the lathe you have than to hope to find the exact part.
    Not a complex fix.....Make a sub plate that fits your lathe bed from steel of the correct width (same as...
  7. OP has only one post and that was 6 years...

    OP has only one post and that was 6 years back...Does not seem too active here.
    Cheers Ross
  8. Replies
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    Own a Dong Yang, Korean built Okuma licensed copy...

    Own a Dong Yang, Korean built Okuma licensed copy that has the slickest multi start thread setup i have ever seen.
    Spindle nose is marked around its circumference with 6 timing marks.
    There is a...
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    Nice looking machine. Welcome! Cheers Ross

    Nice looking machine. Welcome!
    Cheers Ross
  10. Replies
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    Not sure under what conditions you could "crash"...

    Not sure under what conditions you could "crash" the trip stops....

    Cheers Ross
  11. Replies
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    465

    Here is what it should look like: Not sure what...

    Here is what it should look like:
    Not sure what that fits. Difference is the shape of the top at the pin side.
    https://www.practicalmachinist.com/vb/attachment.php?attachmentid=235036&d=1533655289...
  12. Replies
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    Would think that the underlying issue would be...

    Would think that the underlying issue would be rigidity and stiffness....
    Unit would need gearing that takes room, then bearings for the over sped spindle.
    All gets to be a long package if you...
  13. Thread: FP4 For Sale

    by AlfaGTA
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    741

    Perhaps too late, but indeed i did purchase an...

    Perhaps too late, but indeed i did purchase an FP4NC from the same government auction setup.
    Good experience! Great local rigging company that handled the removal and shipping of my machine at...
  14. Replies
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    That oil lube point shown in your photo is there...

    That oil lube point shown in your photo is there to get oil to the upper shaft and bearings in the vertical head mounting casting. (upper "Y")
    With the fine boring head in place, there are no...
  15. As with most machine tools, cost of decent...

    As with most machine tools, cost of decent tooling can easily match the machine cost.
    Don't have an opinion on the TL, but in my experience in order to use the speed and power of your CNC lathe you...
  16. John: I have used "Rulon 142" for lining slides....

    John:
    I have used "Rulon 142" for lining slides. My local source is "Tri-Star Plastics.

    Rulon 142 | Linear Bearings and Slides | TriStar Plastics

    Rulon was recommended to me by Richard King...
  17. Replies
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    FP5NC's had angular contact ball bearing spindles...

    FP5NC's had angular contact ball bearing spindles for both the vertical and horizontal....Believe this applies to machines having variable frequency spindles , 6300 RPM on both horiz and...
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    Looks like a "production" mill to me. One you...

    Looks like a "production" mill to me. One you setup to run a single job for lots of parts....
    Auto stops and perhaps fixed change gear feed gearing. Limited cross travel.
    Cheers Ross
  19. Replies
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    Original part is most likely made form a steel...

    Original part is most likely made form a steel that accepts case hardening (SAE 8620....) And that part is likely carburized to offset wear.
    Personally i would make this part form "pre-hard" 4140 ...
  20. Not sure i totally understand your scenario for...

    Not sure i totally understand your scenario for the failure.
    If i read you correctly, you believe that taper pin that retains the end collar/helical milling attachment drive failed, and that...
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    Well actually there is a timing relationship........

    Well actually there is a timing relationship.....
    you need the gears in the transmission to be fully engaged (max lever movement at that cam location) when the small hand crank has its locating...
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    745

    P6 bearings (DIN 620) are garden variety..same as...

    P6 bearings (DIN 620) are garden variety..same as ABEC class 3. (electric motor) Nothing special. General bearing house stuff!

    Bearing Tolerances and Precision Levels | AST Bearings

    Cheers Ross
  23. Time to carefully remove the long feed (X) gibs...

    Time to carefully remove the long feed (X) gibs again!
    Being that they are fitted with brass wear facing i would examine them closely to see if there is any evidence that things got tight ....
    Look...
  24. Lots of old cars have built up cranks...Bugatti...

    Lots of old cars have built up cranks...Bugatti GP engines had roller bearing big ends on the rods......
    They used a tapered flat cotter like a bicycle crank cotter only bigger.
    Pin is applied at...
  25. Small point regarding the shear pin. Must be...

    Small point regarding the shear pin.
    Must be sure it is installed in the correct direction.
    The head should end up on the outside of the drive collar, and not nested into the larger hole.
    Pin is...
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