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  1. Replies
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    Re: Milli a new composite mill kit

    Could use hydraulic (oil) bearings instead, that would be plenty stiff and air bearings are mostly useful for high surface speeds and/or to avoid transmission of vibration which are two features that...
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    Re: My CNC Router Build Adventure

    I know there is often a debate amongst engineers about the practice, but I'm firmly in the coloring different components. Love the images, very easy to sort out what you see as discrete pieces and...
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    Re: Help a Newb Build an 8x4 Machine ????

    You really should consider the loads you'll actually apply though under cutting. A 1/2" cutter running at 10Nm of torque is requiring 160kgf, but this is a rather extreme example which is 2-3 times...
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    Re: How was this molded?

    That seam might be a witness line where two mold halves fit together, rather than a true seam.

    Otherwise it might have been two molded halves that are welded together, with that hole being a...
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    Re: How was this molded?

    Probably blow or centrifugal molding. Both can result in no seam because they expand a uniform pellet.

    The hole is to allow airflow as it expands.

    Not my area of direct experience though,...
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    Re: Milli a new composite mill kit

    Nice catch on that Zorbit. Good point, the one motor two screw situation for the machines actually in question would have the same motion direction on both screws and so reversing the thread hand...
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    Re: Help a Newb Build an 8x4 Machine ????

    BTW not shocked on that pricing, it's a niche market and having a large through bore is a real challenge. For one, almost all go to encoders for small servos stick on the end of a shaft and the...
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    Re: Help a Newb Build an 8x4 Machine ????

    I've worked on linear motors, odd challenges to make them and really large work space required vs traditional servos, so that is the main reason for high cost in them.

    Have to really make sure you...
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    Re: Milli a new composite mill kit

    Absolutely makes sense to use a Left/Right screw when the motor is a significant expense. In automotive traction motor design work I'm so very often asked about hub motors or one motor per wheel with...
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    Re: Lathe spindle encoder drive

    If you can't get quite enough threads to extend it from what sticks out, you can maybe thread a stub shaft on instead of the shaft nut, so long as you match the critical features on the nut.
    ...
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    Re: Help a Newb Build an 8x4 Machine ????

    I'd definitely love to hear the pricing when they get back. The axial length of this kind of a solution is an issue in smaller machines, but smaller machines also benefit less from the inertial...
  12. Re: What is the lowest RPM for water cooled vs air cooled chinese spindles ?

    In the smaller endmill sizes, at least here in California, they are pretty damned cheap and last a long time. Even at 1/4" 2F we're running 24krpm in aluminum at 100ipm on a router.

    1/2" starts to...
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    Re: Yet another epoxy granite mill

    Thanks for the update, I've been wondering how it was going!

    Maybe if the belt has issues you can swap out the spindle later and recoup some by selling the current spindle, assuming you don't...
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    Re: slotted holes and bolts question

    If you want to prevent rotation, you can put a nut on both sides and clamp your mounting bracket between them, only use one to apply tension. As for preventing loosening under vibration in your first...
  15. Re: What is the lowest RPM for water cooled vs air cooled chinese spindles ?

    What is the reason you are trying to run lower speed though? Are you trying to cut a really deep cavity and need a large diameter tool for that reason? Otherwise using an appropriate endmill and...
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    Re: Designing a new router called Brevis-HD

    Looking great!

    The insert grid... you put the M8 setscrews in when a hole is not in use and remove them to clamp using an M8 bolt?
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    Re: My CNC Router Build Adventure

    Gosh, Aluminum is almost as cheap as Douglas Fir around here. We keep considering building new worktables out of AL rather than wood.

    If stainless were so cheap...
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    Re: Help a Newb Build an 8x4 Machine ????

    I'm 100% with you London, I wish ClearPath and most servos were through shaft. I'm seriously considering developing my own through shaft servos for driven nut applications up into larger screw sizes,...
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    Re: Milli a new composite mill kit

    I'll just say, I'm going to avoid responding to Mac further. I feel that so long as he's never questioned or errors called out, he provides mostly helpful additions which are beneficial to the forum,...
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    Says who? Step and direction using 4 wire (rather...

    Says who? Step and direction using 4 wire (rather than serial or other comms) is a PWM 50% duty and a logic binary signal. Show me one BOB that is using 4 wire step and dir that isn't using PWM.
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    Re: My CNC Router Build Adventure

    Aside from that I have the genuine copy at the link I provided, we're not talking about bolt threads, I'm just recommending the general document.
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    EDIT: Removed because it was unnecessary (:

    EDIT: Removed because it was unnecessary (:
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    Re: My CNC Router Build Adventure

    I find that the nicest feature of the ebook, you can simply jump back to the section content list or the master content list, it's all internally hyperlinked.

    Otherwise it's literally thousands of...
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    Re: Milli a new composite mill kit

    Someday I gotta learn emojis for vBulletin like Mac... (:
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    Re: Milli a new composite mill kit

    It's 99% safe to assume that the 5V PWM circuit in the BOB is protected via a resistor against over current even against a full short.

    In a really quality manual, they would specify the protection...
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    Re: What Swiss Turn Machine do I buy?

    If you don't get a response, you may also consider contacting https://grimsmoknives.com/, they run a swiss. They also have YT videos and podcasts regarding why they chose it, how it's working out for...
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    Re: Milli a new composite mill kit

    Alright, let me put it differently with a bit more answer. If you are using a PWM output signal, which I assume, then the question is going to be whether or not the BOB can handle twice the current...
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    Re: Milli a new composite mill kit

    What signal type are you using from the BOB to the driver board?
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    Re: Designing a new router called Brevis-HD

    I have no idea from a PMSM motor designer perspective if the microsteps will make it more likely you miss the physical steps, but steps are very sharp differences in torque vs motor position....
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    Re: My CNC Router Build Adventure

    The Unbrako dock now lives on my desktop as well, primarily because it's a more to the point reference than the Machinery's Handbook, which is more like the catch-all reference.

    Jayne, the...
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