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  1. M

    lathe recommendation needed for micron accuracy

    I'm more engineer than machinist. The parts have been made correctly in the past, I have the CMM reports, measurements in a controlled climate. In our testing experience, parts that meet the print do not fail during testing, and those that don't... often do. I think the crown profile shape is...
  2. M

    lathe recommendation needed for micron accuracy

    Thanks for the replies. The parts are in fact bearings that are pressed into a steel insert in an aluminum housing, then finish turned. I should have mentioned that the OD of said housing is 7.8". The shop is not extensively climate controlled, we only maintain within say 60 to 80F. If a...
  3. M

    lathe recommendation needed for micron accuracy

    Hello, I'm searching for a machine which can (really) accurately cut tapers/2d curve profiles into relatively soft materials (bronze, lead, aluminum). The challenge is that the accuracy required is +/- 0.0001" or better on the average ~1.8" inside diameter, over a ~1" length. We also need a...
  4. M

    WTB CNC grinding equipment

    There's a red arrow pointing right at the part to be ground, in the image I posted. Can't share prints without NDA, and I don't think they're needed for this discussion. I'm only looking for suggestions where to look. I want the cheapest machine that will do the job well. Thanks for the...
  5. M

    WTB CNC grinding equipment

    Hello, My employer is looking to buy: 1) a machine which could CNC grind complex splines, to finish the outer profile of rotors such as the one seen here: This part is currently CNC milled and then polished as separate steps, but with grinding, we could save time and be more accurate (+/-...
  6. M

    RFQ: 5 axis aluminum prototype engine parts

    Got a few replies, thanks everyone. By the way, we are good at paying, typically 2 weeks.
  7. M

    RFQ: 5 axis aluminum prototype engine parts

    Hello- I have not posted in a while due to being happy with existing vendors. However, the front and rear side housings for our engines (LiquidPiston) have become complex enough that 5 axis would make better sense than so many individual setups. None of our current shops have 5 axis...
  8. M

    Adventures converting Prototrak MX2 from Floppy Drive to USB

    Unfortunately, still no write up, but it is on my list. I know a few people are interested and sorry for the delay
  9. M

    which EDM machine?

    Following up, based on advice here, decided not to purchase a machine. The amount I'm sending out does not justify the costs estimated here. Thank you
  10. M

    which EDM machine?

    Hi guys, Are you looking for something cheap and used, or does your budget allow for a new machine? Cheap and used Are you looking for a specific set of capabilities? Nothing unusual, just .002" accuracy (should be easy!) and autothreading Do you have the space in your shop to accommodate...
  11. M

    which EDM machine?

    Hello, My shop currently does not have a wire EDM, but I'd like to add one in the near future. It does not need to be large, 4"x4" XY travel is enough for 90% of my work. Accuracy would be nice, but for most work +/- .002" is good enough It does need to accept CAD files of some kind and cut...
  12. M

    Making Q10 gears with a 4/5 axis machining center

    Thanks guys, that makes sense about the scallop height and tool wear, I have not tried programming a toolpath so I don't know what it would take. That's why I was asking if anyone had tried. Could this problem be solved by using a custom tool that has the profile of the tooth? It would look...
  13. M

    Making Q10 gears with a 4/5 axis machining center

    Thanks for the input- to answer some points- Q10 gears are required for the application according to a gear consultant hired to analyze the application. I'm the engineer integrating them into the rest of the system and dealing with the manufacturing. There are plenty of gear inspection...
  14. M

    Making Q10 gears with a 4/5 axis machining center

    Is it possible to make Q10 spur gears (say 2mod, 1.8 inch pitch diameter, carburized 8620) with an accurate 4 axis machining center? The tolerances work out to about +/- .0002" all over the tooth profile, and this would involve hard milling after the carburizing. It's definitely a challenge...
  15. M

    Adventures converting Prototrak MX2 from Floppy Drive to USB

    Ended up using 2 different cheapo emulators at once, but my friend has not completed the writeup yet. Soon I hope
  16. M

    Rotary Engine Machinist in CT

    Here is a link to the job description, which is copied and pasted below: Careers | LiquidPiston I have worked for/with this company since 2011 and can answer any questions about the job here or in PM's. The "Qualifications" are guidelines, not set in stone. The engineering team is expanding...
  17. M

    Adventures converting Prototrak MX2 from Floppy Drive to USB

    I spoke to Southwest a few weeks back, and I think I remember the price for the EMX control being on the order of $8,000. This might be justified for a newer Bridgeport, but mine has some Y axis way wear, more backlash than I'd like, etc. Even with the upgrade, it would still be a 2 axis CNC...
  18. M

    Adventures converting Prototrak MX2 from Floppy Drive to USB

    Small update- thanks to the help of an expert in old computers (found on Craigslist), this machine is now running with an emulator. I will be posting the method he used in the next 2 weeks, once we check a few final things.
  19. M

    Adventures converting Prototrak MX2 from Floppy Drive to USB

    I know there are simpler ways, but at this point I've bought 2 emulators and a floppy drive, and am too stubborn not to realize my goal of using a thumb drive. That's the way I'm used to working (previously ran a modern Haas w/ USB port). On that note, if anyone has a use for this emulator...
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