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Type: Posts; User: DavidScott

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  1. Replies
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    Interesting experience with the 6063! I have...

    Interesting experience with the 6063! I have machined enough to know what a PITA it can be. What was the base reference for the 50% reduction in cutting forces? Was it dry or with a coolant?
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    Prints big enough to read would help. Perhaps do...

    Prints big enough to read would help. Perhaps do the engraving with a laser since I am sure you need it on an angled surface like that.
  3. Thread: Datron

    by DavidScott
    Replies
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    3,513

    Well it is just bearings. The 10k BT30 spindle...

    Well it is just bearings.

    The 10k BT30 spindle in my Enshu was $2200 to rebuild in 2012, the Kitamura is a hellova lot more spindle.

    I looked into these air-driven spindle units 15 years ago or...
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    The only difference between air and coolant when...

    The only difference between air and coolant when machining polypropylene would be you could double your output with coolant, same with nearly all plastics including nylon. Polypropylene will not be...
  5. Thread: Datron

    by DavidScott
    Replies
    34
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    3,513

    He said rebuild not replacement, and for...

    He said rebuild not replacement, and for reference, my Kitamura 15k BT30 spindle is quoted as around $6k to rebuild.

    Air spindles are interesting but have no torque so only work with tiny tools...
  6. If you can step it down then just get a couple of...

    If you can step it down then just get a couple of mills from Harvey, you want a backup in case you break one. Their extended reach stub flute aluminum mills can feed quite aggressively, but be...
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    No Sharp experience but, if it has a geneva wheel...

    No Sharp experience but, if it has a geneva wheel on your carousel like my Enshu then you grease the surfaces where the roller contacts it, I brush it on. While you are at it grease the door rub...
  8. Perhaps 40 years ago, times have changed.

    Perhaps 40 years ago, times have changed.
  9. Frank, thank you. How much difference should the...

    Frank, thank you. How much difference should the 30 taper spindle angle be to the optimum tool holder angle? I really like this mill and spindle so that is why I want to make sure I get this right.
  10. Frank, Mike, are these tools ground to the tool...

    Frank, Mike, are these tools ground to the tool holder taper or spindle taper angle? It looks to me they are a tool holder taper angle. I am looking for a tool to check the spindle taper angle. ...
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    You can't hack mold nylon. It has to be...

    You can't hack mold nylon. It has to be perfectly dry before melting. Unfortunately, your choices of grades and modifiers are much smaller if you buy an extruded bar to machine your own. I think a...
  12. I was just finishing some maintenance project on...

    I was just finishing some maintenance project on the mill, I think it was when I reballed the X and Y screws. She always goes nuts when our ability to support ourselves is down. She got a real ass...
  13. The lines on the tool holders are from day one of...

    The lines on the tool holders are from day one of the last rebuild. Other than that the bearings are not too bad. 4k hours now and one too many crashes. My wife came out to tell me she thought I...
  14. C&M has done all work to this spindle since I...

    C&M has done all work to this spindle since I bought the machine used and needing a spindle rebuild. When they rebuilt it in 6/2005 I asked if it was possible to sub ceramic hybrid bearings for the...
  15. I understood post #17 was just grinding the taper...

    I understood post #17 was just grinding the taper with the old bearings, since they are running fine still. Yes new bearings with proper preload, if that's the cause of the problem, and a new grind...
  16. The clearance grind and chrome were done first,...

    The clearance grind and chrome were done first, then it was assembled/ rebuilt. The grinding job looked flawless when it was new and still looks very nice. Funny though how I could see a shadow in...
  17. I would bet money the regrind would look the same.

    I would bet money the regrind would look the same.
  18. Both rebuilds have been done by C&M in Portland...

    Both rebuilds have been done by C&M in Portland with new bearing sets, standard full price rebuilds.
  19. Drawbar is around 500 lbs so is good, a little...

    Drawbar is around 500 lbs so is good, a little more than what it's supposed to be. I think the taper is the spindle was ground using a tool holder for the master and blued up beautifully with no...
  20. True it is polishing the grinding marks out but...

    True it is polishing the grinding marks out but not digging holes leaving the bronze film.

    Just checked another tool holder, Lyndex, and it too has the lines on it. Also, all my tool tapers are...
  21. Definitly not fretting, other than there is a...

    Definitly not fretting, other than there is a small spot of fretting on the left tool holder towards the nose.
  22. This spindle is a direct drive BT-30 with two...

    This spindle is a direct drive BT-30 with two angular contact bearings in the nose and two at the top, with a spacer setting the preload.
  23. Frank will like this thread. I think all the...

    Frank will like this thread. I think all the tool holders with these marks are from the same single purchase. I will take a look at some other tool holders on that mill when it stops. These tool...
  24. It's the spindle. These same marks are on several...

    It's the spindle. These same marks are on several other tool holders, all Maritool, to varying degrees of hard use. Holders are 3/8" stub sidelocks so they are pretty solid. Other Maritool holders on...
  25. Some technical VMC spindle questions I have please

    The first question is what caused the grinding marks on my spindle taper seen here on the tool holders? The marks on the tool holders are caused by linear high spots in my spindle taper that are...
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