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  1. T

    Filling a Zamak/zinc alloy step pulley cone with epoxy for stress crack prevention?

    Not that anyone is interested in this, but just in case. Wound up filling the whole thing with MetalSet A4. Made a little tool to level it out and to make the fillets nice. MetalSet A4, McMaster PN 7500A11. $23 for a set of 11oz tubes. In my experience, everything from Loctite, 3M, or Devcon...
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    Machine Tool Paint: Cheaper, more readily available alternative to Polane, Imron?

    Digging up my own thread to make an update. And, I wish I had seen some of the more recent responses as they may have been helpful. I will remember the "whiting" idea for the next time I inevitably decide to re-paint some 80 year old thing. Thank you for that. Degreasing consisted of...
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    Filling a Zamak/zinc alloy step pulley cone with epoxy for stress crack prevention?

    Ah, yes that is much better, no need to trust the ol' eye ball to figure out if it's indeed balanced. Thanks!
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    Filling a Zamak/zinc alloy step pulley cone with epoxy for stress crack prevention?

    Thank you. A good idea, but I have no lathe at the moment. My idea to make a new pulley was a possible future project. The only other issue is that the bearings are integral to the pulley assembly so it will not spin directly with an arbor, unless I misunderstood your idea. A quick search seems...
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    Filling a Zamak/zinc alloy step pulley cone with epoxy for stress crack prevention?

    Thank you. Just to clear my confusion - you are suggesting to make a new pully out of 6061, and then fill it? Or are those two separate thoughts?
  6. T

    Filling a Zamak/zinc alloy step pulley cone with epoxy for stress crack prevention?

    Thank you. I’ve never tried to balance a part like this. My initial intuition is to hang it from string and check for level on X-Y plane…by eye I guess? (There has to be a better way?) Can get a piece of rod precisely the size of the bore, and then drill a very accurate hole through the...
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    Filling a Zamak/zinc alloy step pulley cone with epoxy for stress crack prevention?

    Thank you for your advice. I thought of that; but wondered “how off balance could it be if the same volume of resin was poured into each section?”. Somewhat rhetorical question - I suppose it doesn’t take much imprecision in the pour to throw it off. Then again, my epoxy “fix” is not...
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    Filling a Zamak/zinc alloy step pulley cone with epoxy for stress crack prevention?

    Hi all, After about 9 months of slow (but steady progress), I am finally ready to re-assembly my refurbished Walker Turner 900 series drill press. Generally speaking, the build quality of the machine is excellent and have no doubts about durability about most of the iron/steel parts. Then...
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    1ph-to-3ph Conversion: Is a higher power motor necessary? (And other questions)

    Thanks. I certainly would use it. Did you see my private message, by chance? No messages appear in my sent folder. Not sure what's up with that.
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    1ph-to-3ph Conversion: Is a higher power motor necessary? (And other questions)

    Thanks, Jim. That means a lot, although I feel quite undeserving. (You could get much better money on eBay!);)
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    1ph-to-3ph Conversion: Is a higher power motor necessary? (And other questions)

    Hope you all had a happy new year. Thanks for the discussion. Ultimately, based on some of your comments, it still seems that a VFD solution would work well, but in terms of cost/benefit, I'm not so sure anymore. If I did a VFD conversion, I'd likely go the full nine, that seemingly could get...
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    1ph-to-3ph Conversion: Is a higher power motor necessary? (And other questions)

    Ah. Yes, now it makes sense. I am an electrical engineer by trade. (And it shows!) So, pulleys have the advantage of slowing the rotational speed down by the ratio of the pulley diameters and increasing the driven torque by the (inverse) of that ratio. Yes, yes...that sits well in my head. On...
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    1ph-to-3ph Conversion: Is a higher power motor necessary? (And other questions)

    Some good wisdom in that. Yes, I have just 2 pulleys, which gives a 600rpm minimum speed. I'd like to go to 200-300rpm or so...The slow-speed attachment is unobtanium. I have considered trying to build my own, but it is a little complicated without a mill or lathe, although I think it would make...
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    1ph-to-3ph Conversion: Is a higher power motor necessary? (And other questions)

    Good idea! Yes, can simply rig up a small AC fan with power from the VFD wiring box.
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    1ph-to-3ph Conversion: Is a higher power motor necessary? (And other questions)

    Good notes, thank you. And, I hadn't thought about the wear-and-tear of the initial start up jolt as the gears mesh , etc. I wonder what percentage of wear (on average) is due to startup and what is due to steady-state usage.
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    1ph-to-3ph Conversion: Is a higher power motor necessary? (And other questions)

    Thanks for your detailed reply. I guess what I'm failing to understand is why a loss of horsepower matters at low speed. As I understand it, and it may be a flawed understanding, "the torque is what does the cutting". It is the centripetal force measured some distance from the center of...
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    1ph-to-3ph Conversion: Is a higher power motor necessary? (And other questions)

    Hi all, I'm in the midst of restoring an old Walker Turner 900 series drill press. Although the 600rpm minimum speed is not terrible, I think it's still about 2x too fast for some types of work I might get into. Secondly, I have a nagging fear that I will crack the pot metal spindle/motor...
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    Machine Tool Paint: Cheaper, more readily available alternative to Polane, Imron?

    After two months of cure time, I am not too happy with the durability of the BEHR urethane alkyd enamel paint. The initial tackiness went away after about 2-3 weeks, and it cured to a seemingly hard finish. But even after two months, it still fails a fingernail test with modest to heavy pressure...
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    Machine Tool Paint: Cheaper, more readily available alternative to Polane, Imron?

    Thanks everyone for the good discussion. Well, I took a bit of a chance and went with the BEHR Urethane Alkyd Enamel (Semi-Gloss) from Home Depot. Only $17/quart. I picked the color "North Woods", seems close to the original Walker Turner green, but perhaps a touch more green. Prep process...
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    Machine Tool Paint: Cheaper, more readily available alternative to Polane, Imron?

    Thank you. Given that it's basically impossible for someone on the internet to predict how "Hardener X" will work with "Paint Y", I guess best option is to run some tests. I am curious whether a glass-like finish really makes sense compared to something a little more plastic. I would imagine...

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