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  1. In regard to grinding, he mentioned the groove...

    In regard to grinding, he mentioned the groove width being narrower at the OD. I don't think you're going to get much of a grinding wheel in there and have room/clearance to do anything without...
  2. Thread: Rfq

    by pianoman8t8
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    14
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    1,544

    You are correct.

    You are correct.
  3. Thread: Rfq

    by pianoman8t8
    Replies
    14
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    1,544

    Ox, I should clarify, when I knurled pre-hard...

    Ox, I should clarify, when I knurled pre-hard 4140 before, it was with a forming tool from Accu-Trak, Straddle-type with convex knurls. Worked very well, knurled about a 3" length on 1" nominal OD...
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    No, when I ran pony motors, I had a loose belt...

    No, when I ran pony motors, I had a loose belt with a hand-operated tensioner. Kick on pony motor, pull tensioner, switch on power to RPC, then kill pony motor and release belt.
  5. Negative here

    Negative here
  6. Thread: Rfq

    by pianoman8t8
    Replies
    14
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    1,544

    I've knurled prehardened 4140, no problem.

    I've knurled prehardened 4140, no problem.
  7. Replies
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    On a related note of PRC's hopefully not...

    On a related note of PRC's hopefully not furthering off-topic discussion, I have 3 RPC's in my garage shop, I just went and checked my idling loads.
    (small scale shop, not out there every day,...
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    Sticky: TD-4242, should have over current protection...

    TD-4242, should have over current protection device for that anyway.
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    Quite the diamond at the 0:28 mark.

    Quite the diamond at the 0:28 mark.
  10. Replies
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    FWIW, I knurled a job in the CNC lathe recently...

    FWIW, I knurled a job in the CNC lathe recently that was 4140 pre-hard, picked up an Accu-Trak straddle-type knurling tool with 64DP convex knurl rolls, worked slick. I was running 200rpm, .030ipr...
  11. Replies
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    4,809

    Yeah, being in Maine, it's about as far away as...

    Yeah, being in Maine, it's about as far away as you can get on the continent.
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    949

    Maine Machine in South Paris (not coastal) has a...

    Maine Machine in South Paris (not coastal) has a small Blanchard grinder, may give them a shout. Not sure if he's still there, but a few yrs ago I had contacted Dan Landry there in regards to a...
  13. Even has a quill... drool!

    Even has a quill... drool!
  14. Replies
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    Ah yes, I recall that thread. It was pretty...

    Ah yes, I recall that thread. It was pretty messed up... Spindle taper/runout was way off. Like, several thousandths.
  15. The machine limit is 8k rpm, and approx...

    The machine limit is 8k rpm, and approx 700-800ipm. Sharp SV2412 mill.
  16. The cutters I ordered are straight flute, so...

    The cutters I ordered are straight flute, so hopefully they'll work decent enough.
  17. This particular feature is just milling a face to...

    This particular feature is just milling a face to an angle. There will be no interior wall, so my thought was to first go around perimeter of face via climb milling, with about 1/3 of cutter width...
  18. What sfpm do you guys run?

    What sfpm do you guys run?
  19. I don't disagree with that, but this is a one-off...

    I don't disagree with that, but this is a one-off job, likely won't see carbon fiber again for a long while. The cost associated with replacing coolant, or otherwise draining tank etc, and an...
  20. Machining Carbon Fiber with PCD endmill

    Hey guys,
    It's been quite a while since I last worked with carbon fiber. Last time, I used carbide, it was a simple feature in only 1 or 2 pcs. This time around, I need to mill a face roughly...
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    The question is vague. Is the ID to be ground? If...

    The question is vague. Is the ID to be ground? If so, just 1 ID, or both... Can't see tolerances. Personally, I'd vote for expanding mandrel on the smaller ID, a little less in length than that ID,...
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    I'm guessing a cutter grinder, like an Anca or...

    I'm guessing a cutter grinder, like an Anca or Walter.
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    That's silly. No problems with that up here, only...

    That's silly. No problems with that up here, only a couple times that happened last yr, and they were warranted. Sometimes they'll call me if they can't make it up our hill, i have them leave...
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    LOL, not the first time tempering in the house...

    LOL, not the first time tempering in the house oven ;)
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    Easy side work on a manual while the CNC is...

    Easy side work on a manual while the CNC is running (or someone starting out who doesn't have a CNC), out of some extra material from some other previous job. This will be somebody's gravy. By the...
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