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Drilling holes in Screwless vise?

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  • oldtiffie
    replied
    POssibly as accurately as these (measurred in microns, micrometers, um) which are approx x 40 = 1 micro-inch





    I've checked them as best I can and I can't find any errors.
    Last edited by oldtiffie; 03-08-2012, 05:02 PM.

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  • willmac
    replied
    I would be interested in how the manufacturer measured their squareness and parallelism to get those figures. 100% CMM?
    Cynical? Possibly.

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  • oldtiffie
    replied
    Well Mike.

    Its "good enough" for a "rough and ready" meddler as I muck about in the shop.

    I've never claimed that I am a "machinist" (good or bad) here so I guess that for me "near enough is good enough" with tools and machines.

    So other than straight out "cock-ups" its surprising how often "near enough" is "good enough" here (or seems to be).

    Those vices make good paper-weights and door stops too - even packing pieces on the mill - sort of.

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  • dian
    replied
    http://www.pinetti-tools.de/pdf/pine...-zubeh%F6r.pdf

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  • Mike Hunter
    replied
    Not necessarily anti-Chinese bias,

    Looking at the site; yes they say “Accuracy within 0.005mm (0.0002") in squareness and parallelism”

    Which comparable to a Hermann Schmidt, and better than my Suburban (which only has an accuracy of .0003), both costing 4-5 x the price of the one you picked up.

    If you’ve confirmed the measurements, that’s a pretty darn good value.

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  • oldtiffie
    replied
    They are if for no other reason than that they have no "moving jaw up-lift" problems - and there is no lead-screw for ham-fisted operators to over-tighten (with or without a "cheater bar").

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  • dian
    replied
    these vises cost three times as much as the "regulal" ones, so they better be good.

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  • oldtiffie
    replied
    Originally posted by Mike Hunter
    Looking at the numbers in the data sheet provided, If they are correct, I'm not all that impressed, especially for a grinding vise. And the allowable tolerance; does spec "B" say it must be flat to within .005 or they they promise that the height will be within .005 ?
    Mike.

    It does not matter whether the units are inch or milli-metre providing they are the same top and bottom ie 5"/10" = 2 same as 5mm/10mm = 2 as it is a ratio. It is in mm.

    0.005"/100" = 0.005"/100" = 0.00005" per inch (1/2 a tenth per inch) or 0.00005mm per mm

    I ran a couple of checks a while ago and they came up within spec.



    I don't assume (or am damned certain??) that it must be wrong because it is "Chinese". I took them at face value and random checked them anyway irrespective of their country of origin.

    It may (will?) surprise those with an anti-Chinese bias that there is some good (and bad too) stuff comes out of China - and these vises are some of them.

    https://www.machineryhouse.com.au/V365

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  • Mike Hunter
    replied
    If its in mm, who's going to do the measuirng of D & F?

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  • adamc
    replied
    Oldtiffie,

    Any chance you'd be willing to have a look at the vise you have to see if that spec sheet bears out? I thought the same thing Mike did. If those are inches, maybe I'd do better with a used Schmidt. If they are metric, that vise could be better than a Schmidt (I think the Schmidt vises are true to .0005").

    Just looking at A, it could be out by:
    .003" (not bad, but not great)
    .003mm (.0001", better than a Schmidt costing $800)
    or .003cm (.001") This is my guess for what they are claiming. I'd also guess those are all phantom dimensions.

    Adam

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  • Mike Hunter
    replied
    If those measurement are in mm, wow that's one heck of a vise.

    .001 mm = .00004, don't think my Suburban vise can claim that kind of accuracy.

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  • small.planes
    replied
    With the correct tools they are certainly drillable.
    I recently have had to drill through several ball bearings (60-67 HRC according to manufacturer)
    Solid Carbide drill, 4k5rpm (top speed on my TOS), peck drill against the quill stop, letting the tool dwell slightly. No coolant.
    The Vice should be drillable if you machine is stiff enough. The TOS is built like a brick ****house.
    To counter bore you might get away with an insert mill, and for the drilling a carbide tipped masonry bit appropriately resharpened will probably do.

    Dave

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  • Jaakko Fagerlund
    replied
    Originally posted by Rosco-P
    How did you verify that hardness specification? Or do you blindly accept everything (parallelism, squareness, etc.) on the inspection sheet for a chinee product signed by HuFlungDung?
    Do you verify everything you buy, or do you just blindly accept everything signed by John Doe?

    The point being that it doesn't matter where the product comes from or who has signed it, as crap or good products can be made anywhere.

    Mike Hunter, I think those are millimeters, as China is metric. Edit: Yes they are millimeters, and seems like a good vice according to those measurements.

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  • Mike Hunter
    replied
    Looking at the numbers in the data sheet provided, If they are correct, I'm not all that impressed, especially for a grinding vise. And the allowable tolerance; does spec "B" say it must be flat to within .005 or they they promise that the height will be within .005 ?

    Leave a comment:


  • Rosco-P
    replied
    Originally posted by oldtiffie
    These vises are HRC 56 (hard)
    How did you verify that hardness specification? Or do you blindly accept everything (parallelism, squareness, etc.) on the inspection sheet for a chinee product signed by HuFlungDung?

    Leave a comment:

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