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  1. erosnicolau

    What's the name of this machine?

    I think I finally found it: it's called a gear shaping machine...
  2. erosnicolau

    What's the name of this machine?

    Hello, I need to cut some internal gears to high precision and in less than a day / part, and was looking for a machine able to achieve such a feat. I had been looking for such a design for a long time, until I came across a glimpse of it in a marketing video of the HarmonicDrive...
  3. erosnicolau

    Size 12, Schedule 80, seamless Aluminum pipe?

    You welcome, man! And thanks for the link. I had visited that link myself, too. The same unit is also for sale on a Japanese surplus store site - so at least you know where it's coming from. Unfortunately, this is a one-off (a spare, sold at 1/10 of the real price) and my concern is to find a...
  4. erosnicolau

    Irregular shape cam grinding

    Mike, you put a much needed smile to my face :) I was of course talking about reducing spindle vibrations but your lines were encouraging nonetheless :)) So far, the only idea that comes up is to separate the grinding cup axle from the motor axle - see the image below (where I also figured the...
  5. erosnicolau

    Irregular shape cam grinding

    Another question for you guys... But first, the context: As I mentioned, I plan on switching from horizontal spindle grinding to vertical spindle grinding. I only used a horizontal spindle flat grinder so far because that's what I had access to. However, for this application, a vertical spindle...
  6. erosnicolau

    Irregular shape cam grinding

    @ornerynorsk Thank you too, man. I'm seriously considering giving up grinding on a classic vertical (horizontal axis) flat grinder, and using instead a small, horizontal (vertical axis), well-balanced, well-dressed stone, attached to a vertical axis high speed broach, mounted on a vertical...
  7. erosnicolau

    Size 12, Schedule 80, seamless Aluminum pipe?

    Hi, again, guys! @tbuelna: Yep, roll (longitudinal). I'm inserting a link here so you can better see the context of that bearing. About the cross-section profile: since, for this prototype, I used relatively soft steel wire, after some grinding in, the wires automatically begin to form exactly...
  8. erosnicolau

    Size 12, Schedule 80, seamless Aluminum pipe?

    Hi, @tbuelna! To answer your very pertinent questions one at a time: 1. This gimbal will very seldom move, if ever at all. It is meant for slight adjustments of the ROLL position of the camera. Even at full speed, in this particular application I made it for, it would only achieve 1-2RPM. At...
  9. erosnicolau

    Irregular shape cam grinding

    Thank, Mike Yep, as I was saying, I already have a high torque, slow speed geared motor, which I'm linking to the big disk shaft with a further 1:3 bike pinions & chain reduction. I will try to feed as slow as the motor will permit, this time. Will keep you guys posted, anyway :) Eros
  10. erosnicolau

    Irregular shape cam grinding

    Hi again, guys, @BrianE22: yep, the parts have concentric surfaces - including an inner surface - that of the 10mm hole - fit for grinding. Also, when I sent the parts for grinding (everything but the external shape) I specified the tightest concentricity tolerance possible along with the...
  11. erosnicolau

    Size 12, Schedule 80, seamless Aluminum pipe?

    Hi again, folks, Some updates: 1. The guys previously mentioned (willing to roll, weld, then lathe) the rings, proved to be an utter waste of time: after a month and a half, they were still leading me on with "tomorrow, maybe", so I bitterly ditched them explaining that this is not a normal...
  12. erosnicolau

    Irregular shape cam grinding

    Well, I've lost hope of doing these parts in Eastern Europe anyways... After almost two weeks of "no, we haven't even heard of such idiotic tolerances" everywhere I ask, I'm now turning my searches around towards any corner of the world that will help out... so I'm not looking for Eastern...
  13. erosnicolau

    Irregular shape cam grinding

    @ornerynorsk YES, MAN, that's what I've been looking for. Unfortunately, none of that in my country :(((( That looks exactly like a tool capable of delivering high tolerance irregular shape cutting... Any specific recommendation? Thanks, Eros
  14. erosnicolau

    Irregular shape cam grinding

    @MikeHalloran The shape is something like the marriage between an oval and a hexagon, or an oval with 6 slightly protruding diameters. Not on oval, not a circle, you know. About the technical drawing: of course I included it in the quote requests, and it DOES show the required tolerance (even...
  15. erosnicolau

    Size 12, Schedule 80, seamless Aluminum pipe?

    @metengr: Thanks, mate. I had already contacted them, and they were among the very few gracious enough to decline in a very kind and polite way @EdStainless: I was only talking about backyard pouring ;) Of course controlled environment, professional pourings are another question altogether. For...
  16. erosnicolau

    Size 12, Schedule 80, seamless Aluminum pipe?

    Again, basting a 50mm high, 8mm thick, 310mm diameter ring out of a solid block, is wasting more than 90% of that block...
  17. erosnicolau

    Irregular shape cam grinding

    Hi, guys, I have a cam with an irregular shape, about 10mm thick and about 46mm in the longer diameter. I need this to be cut and precisely ground to micron tolerances, if possible. There are three CNC ways of achieving this, in my book: wire-cutting (really not preferred because of the surface...
  18. erosnicolau

    Size 12, Schedule 80, seamless Aluminum pipe?

    Yep, you're right for the short-term plan. For long-term, this pipe should make economic sense. About recycling: it may be so, but we're talking about 90% of it or more being scraped for recycling at a low cost - it's still a hefty loss.
  19. erosnicolau

    Size 12, Schedule 80, seamless Aluminum pipe?

    Hi, there, My question is simple: do I stand any chance of finding some retail (short length) Size 12, Schedule 80, seamless Aluminum pipe anywhere on this planet? I need it to machine 2 races for a contraption of a large diameter (~300mm), extremely thin bearing-type application, for a slow...
  20. erosnicolau

    Flexible / deformable bearing

    Hi, Terry, No problem, I kept busy asking around - including with the two hollow bar suppliers you kindly suggested. As expected, they completely ignored my emails. I'm being neither sarcastic nor pessimistic when I say it's extremely tough to find people willing to engage in small quantities...

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