Forums Beginner Questions Hurco oil for polishing

6 replies, 5 voices Last updated by Frankwood 6 months, 2 weeks ago
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  • #5746

    jude
    Participant
    @Jude

    I have seen a few rave reviews for “Hurco” oil as THE best as a carrier for polishing with diamond.

    The “Hurco” oil mentioned is said to be used to lubricate “brass” musical instruments with piston valves – like trumpets and tubas.

    I thought this would be easy to find, but despite a lot of looking, I cannot find enough information to be sure I have the right item; most of the references to Hurco oil I see have to do with machine tools.

    Does anyone know EXACTLY what this is and where to but it?

    #5747

    Alan Balmer
    Keymaster
    @alanbalmer

    Look for “trombone oil”. I remember someone recommending this a few years ago. You’ll find several varieties on Amazon, including Herco. (Note the spelling). It will probably work as well as any other light oil, but don’t expect magic.

    #5748

    jude
    Participant
    @Jude

    Thanks Alan, no wonder I didn’t find it.

    You may very well be right, but 2 or 3 expert youtube faceters I’ve watched (Vintage Time for one) say this is THE best. Maybe its exactly the right viscosity or something.

    At this point in my learning curve, I’m accumulating every little edge and trick I can find, so even if this makes ANY difference, it’s a success for me.

    Any other ideas or suggestions welcome….

    #5749

    Alan Balmer
    Keymaster
    @alanbalmer

    Just for fun, click on the search symbol at the top of the page and look for “trombone”. You’ll find an article by Carl Unruh recommending it, and several mentions in past newsletters.

    #5753

    Lowjiber
    Participant
    @Lowjiber

    If you can’t find Herco, just about any brand (sometimes referred to as “valve oil”) will work well. I use Music Nomad brand synthetic valve oil with diamond bort. Works well.

    A light coating of WD40 works well too.

    #6434

    gemmakermz
    Participant
    @gemmakermz

    i still say NO oils ,, no GREASEs have you ever tried to stop your car on an oily or greasy pavement. you want contact with polishing agent and stone and oils/greases are lubs not wetting agents and worse for diamond. the best way is very slow with water, a wetting agent, and just enough to make a muddy slur of the polishing agent. i teach(for free) to use a tin lap turning very slow with just enough water to make that muddy slur of 50,000 diamond powder and not enough to flush everything off. i have members that still wanted to use oils etc. and finally my way and swear by it now.

    #6446

    Frankwood
    Participant
    @Frankwood

    Oil is used as a carrier, its job is to evenly spread the diamond over the lap and lubricate the lap surface.
    Water is a pain to use because if you don’t get the drip just right the lap will either dry out or wash the diamond off, If it gets to dry it will put scratches in the facet. The muddy slurry your talking about gemmakerm will produce a good polish. But under a 10x loupe the facet is full of tiny grooves. Which in competition cutting is no good.
    Oil is the easiest to use with diamond. I suppose any light oil will do, I use one or two drops of baby oil with 60k diamond powder on a BATT lap.
    Rubbing the mixture onto the lap with my finger and wiping any excess off, till the surface of the lap feels almost dry.

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