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Type: Posts; User: spumco

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  1. Re: Holding brake needed on a 4/5th axis when using a harmonic drive?

    Did you say Ohio?

    Care to share what part?
  2. Re: Need some help identifying a large ball screw

    One end is unsupported - likely the Z-axis of some machine.

    If you're interested in narrowing it down and have plenty of time an ebay search of Maho equipment from a likely vintage might reveal...
  3. Re: Holding brake needed on a 4/5th axis when using a harmonic drive?

    Yep. But if you keep the epoxy very thin - i.e. file/grind/mill the underlying surfaces fairly flat - epoxy deflection will be lost in the noise. With a concentrated point load the epoxy isn't...
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    Re: New upgrades to the ole Mikini. Servos!

    NICE! Thanks for the servo cover details, that will help when I get to that point.

    Just starting on my control panel for the upgrade. Motion controller and buttons will be remote from the 240VAC...
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    Re: New upgrades to the ole Mikini. Servos!

    Thanks for the details. I think I'm back to the adapter plates.

    I've got a plasma table control system to build first, but once that's done I'm going to start tearing the old Turdkini apart.
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    Re: New upgrades to the ole Mikini. Servos!

    Yep, they're close. Did Jan explain why it was such a PITA to swap heads?

    And do you have any other Mikini drawings?

    EDIT - you're right, they are about identical. I don't see why it wouldn't...
  7. Re: Holding brake needed on a 4/5th axis when using a harmonic drive?

    You steped in this one, buddy, when you hinted at something interesting to people with nothing better to do than Cletus McDingDong FEA's.:rolleyes:

    Your design isn't awful, just needs refining. ...
  8. Re: Holding brake needed on a 4/5th axis when using a harmonic drive?

    Your Z-travels probably are necessary, maybe even more is needed. I guess what was inartfully trying to express is that you need plenty of travel to clear parts, fixtures and still have room for...
  9. Re: Holding brake needed on a 4/5th axis when using a harmonic drive?

    I like the wine rack ATC. Especially because you could put an umbrella or chain-drive in the same spot and not have to deal with moving it in to position - just rotate to the tool slot.

    Some...
  10. Re: Holding brake needed on a 4/5th axis when using a harmonic drive?

    You aren't going to stress the HD with those servos. Based on the spindle motor choice I'm guessing you have a G0704 to Tormach 1100 sized machine. If this is the case, you aren't putting giant...
  11. Re: Holding brake needed on a 4/5th axis when using a harmonic drive?

    I have a DIY harmonic drive 4th axis and haven't found it to be the limiting factor in overall rigidity of my admittedly small-ish machine & setups. I don't have a brake on mine, but I'm using a...
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    Re: New upgrades to the ole Mikini. Servos!

    Yep, that BlackMax looks painfully familiar.

    To be honest, I think it'll be less work to make a top plate and a spindle reinforcing collar thing than fitting a new head. And if I ever switch...
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    Re: New upgrades to the ole Mikini. Servos!

    Those models were extremely helpful. You were right - there are some significant height differences/upgrades Skyfire did post-Mikini era.

    One look and I realized one of the Mikini shortcomings in...
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    Re: New upgrades to the ole Mikini. Servos!

    BTW, Ebay has decent deal on servo/drives if you're looking for a replacement for the BlackMax.

    Just look for something in the 90-130mm frame size, and look for LONG servos. They usually aren't...
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    Re: New upgrades to the ole Mikini. Servos!

    Post or PM me those files please. Would be VERY helpful.

    The skyfire PDB just pushes on the drawbar end. Remember that the belleville stack is significantly weaker on a BT30 than is requierd on a...
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    Re: New upgrades to the ole Mikini. Servos!

    I missed that comment earlier. Was it really a servo, or was it their BLDC that comes on the low-end model?
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    Re: New upgrades to the ole Mikini. Servos!

    There are other spindle dealers on Aliexpress and Alibaba. Might want to shop around - just be aware that there are different bearing/speed options, as well as cartridge lengths & diameters and bolt...
  18. Re: Need help brainstorming a solution for this mill turn spindle

    Well that's just fantastic. You've gotten that thing functional in a remarkably short amount of time considering all the features.

    Care to share photos of the whole thing? I'm particularly...
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    Re: New upgrades to the ole Mikini. Servos!

    No, the servo won't run with a VFD - it might turn, but there are only a couple of VFD's on the market advertised as being able to run permanent magnet motors. My Hitachi WJ200 claims to do it, but...
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    Re: New upgrades to the ole Mikini. Servos!

    The spindle + PDB were basically $1k to my door. $90 of that was shipping from china to canada. Another $90 was shipping to my place from canada. Another $130(ish) was customs/duties on both legs. ...
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    Re: Any pics of cnc control cabinets?

    I guess I started writing and just thought of all the really stupid stuff I did that caused me irritation while stumbling through the "zero experience to working control panel" learning curve.
    ...
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    Re: New upgrades to the ole Mikini. Servos!

    I bought a BT30-90 spindle from Skyfire along with their PDB. PDB is a 2-stage matched to the spindle belleville stack. You can see both of them on their web site.

    I tried working with the US...
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    Re: Any pics of cnc control cabinets?

    Web browser image searches for "industrial control cabinet" or "Control Panel" have yielded some very good examples of what to do (and not to do). I wish there was a beginner's guide to industrial...
  24. Re: R8 Adapter for AXA toolpost. Has anyone tried this?

    This just got extremely interesting. Yes, I'm interested - but in a BXA holder rather than AXA.

    And I've purchased from that vendor before as well.
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    Re: New spindle motor - Servo or Induction?

    This. In capital letters.

    I started the thread and search primarily because I was looking for something that could provide higher spindle speeds and lower weight, without trading off torque. ...
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