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Type: Posts; User: hackish

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  1. Re: How will I be limited by a slow spindle speed?

    My experience has been that you need both RPM and rigidity to be successful. People often under-size both when dealing with cutting aluminum. It might be soft, but you still need to provide a certain...
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    Re: Light Machine Corp CNC Lathe

    Wow, those are some small machines. Are you able to cut aluminum with them? I have a southy 9l and it does an acceptable job on light cuts. Forget about doing anything productive on it.
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    I guess a fair way to describe it is that it...

    I guess a fair way to describe it is that it might work on os software from 18 years ago, but not printer technology from the same era.

    The reason I prefer acorn is that it is single source and...
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    Re: PM-25MV ball screws, steppers...

    I'd suggest the acorn board. A lot of the stepper boards I looked at were truly hobbyist grade. I don't like steppers anyway, so I suggest watching for some cheap servos, but that's just me. I spent...
  5. Re: grizzly G0704 or the Precision Mattews PM-25MV

    I've used both. Actually I've used a lot of the grizzly mills. Most left me disappointed. Hands down I'm happy that I bought the PM25MV.
  6. I probably just misread it. I think I understand...

    I probably just misread it. I think I understand that you are going to use the z brake to stop it from freewheeling down once the machine is off.
  7. Re: New Build/PM30-MV Mill/Acorn/DMM DYN4-.75KW X/Y/Z SERVO/1.8KW DMM SERVO SPINDLE

    Interesting. Are you hoping to use the brake on the spindle for doing tool changes?
  8. Re: Clearpath servo size recommendations for G0704

    I spent a lot of time playing with a clearpath motor and considering dumping my $3k of panasonic units in exchange. When I started to compare the differences between a DMM and a clearpath, the...
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    Re: DIY mill from commercial castings?

    I think the PM25 design is generally considered better. I do find it is more rigid than a grizzly, but maybe not only for that reason. It's especially noticeable using a boring bar or taking a more...
  10. Re: PM25MV faster than 2500 RPM spindle but with rigid tapping?

    Shooter, which AC servo and controller did you go with? At the moment I'm looking to convert to CnC before addressing the spindle.
  11. Re: Adventures in Converting my Precision Mathews Milling Machine to CNC

    If I could have bought the nut holders and end plates/bearings off ArizonaVideo, I would have done it in a second. Such is the problem with not having any standard sized motors. I guess his Z axis is...
  12. Re: Adventures in Converting my Precision Mathews Milling Machine to CNC

    I was wondering if anyone put significant consideration into the Z axis mount for the ball nut. Looking at photos, some of them appear to be pretty flimsy and I'm concerned about deflecting the Z...
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    Re: Ball Screw Upgrade Timing

    If you're doing a DIY CnC conversion, get used to tearing it apart and putting it back together. Otherwise, just buy a kit from ArizonaVideo.

    You can certainly do something that has the handles...
  14. Re: Adventures in Converting my Precision Mathews Milling Machine to CNC

    I was wondering what AC bearings you guys were using? I've found some 7000 series that might work, but it's very hard to find the 7000RS to have the outer seal. If it's $10 more to get one with a...
  15. Re: How to Increase RPM on PM-25MV (or similar G0704)

    I really think cast iron would be the best material, and the head itself doesn't seem like it would be terribly expensive or complicated to have cast. Many years ago I had some prototypes cast (of...
  16. Re: How to Increase RPM on PM-25MV (or similar G0704)

    I think on a 1.5hp motor, the frictional losses of turning a 5" fan through air will not be a big enough loss to worry about.
  17. Re: How to Increase RPM on PM-25MV (or similar G0704)

    CnCJoesph, I have many of the components and the difficulty is that the kits are always made for NEMA standard size motors and my servos are metric panasonic units. The mounts are done and I have the...
  18. Re: How to Increase RPM on PM-25MV (or similar G0704)

    I've been flipping between the two ideas for a while now. I think I understand the relationship between ultimate motor torque and RPM now. Basically, the diameter of the motors with high torque is...
  19. Re: How to Increase RPM on PM-25MV (or similar G0704)

    I always thought the big machines used direct drive spindles. I wasn't thinking of a big 30hp vmc, as I think a small one can be had at about 3hp.
  20. Re: How to Increase RPM on PM-25MV (or similar G0704)

    What does 75hz give you? About 4500 RPM? I wonder what the proper CnC manufacturers are using to get 10k RPM?
  21. Re: How to Increase RPM on PM-25MV (or similar G0704)

    Do you mind specifying the parts you ultimately decided on? I haven't decided exactly on mine yet, so if it looks good, I'm not against following the same path.
  22. Re: How to Increase RPM on PM-25MV (or similar G0704)

    I was thinking of a solution with my acorn setup for rigid tapping. Put an encoder on the spindle for the Acorn, but run the servo in torque/speed mode. The acorn can then control the speed and the Z...
  23. Re: How to Increase RPM on PM-25MV (or similar G0704)

    rcheli, keep in mind that spinning 7500 RPM will also be running a smaller diameter cutter. The power requirements are not nearly the same as a 2.5" face mill or some other tool that struggles with...
  24. Re: How to Increase RPM on PM-25MV (or similar G0704)

    CNCJoesph. Check out the VESC controller. I suspect with some bigger IGBTs you could drive it just fine. I have a few of the VESC controllers here I bought for my daughter's electric Jeep toy. It is...
  25. Re: How to Increase RPM on PM-25MV (or similar G0704)

    I'm in the same boat. I considered some of the cheap chinese servos for the spindle but eventually decided not - 1.5hp is generally limited to 3000 rpm anyway. I considered turning the pulley down on...
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