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  1. #31
    Join Date
    Oct 2011
    Location
    Norwood-ish, Adelaide
    Age
    59
    Posts
    6,540

    Default

    The cams are scaled to the fitting size so cams for a D1-3 are different to the cams from a D1-4. If you see a cam lock chuck, the cam diameter is actually a good way to work out what it is. I've bought from Mac-it myself to replace my cams and they fit fine.
    I have a drawing with cam details on it but try the bought cams first. I'll even take them off your hands if they don't fit as I have a plan. Worth buying some of the pins for the back of the chucks too (the bits that the cams lock to) as they can also be worn and worth replacing.

    Michael

  2. #32
    Join Date
    Jul 2016
    Location
    Melbourne
    Age
    35
    Posts
    1,522

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    Now that's this kind of first hand information that dreams are made of. Thanks Michael ill order them tonight.

  3. #33
    Join Date
    Jul 2016
    Location
    Melbourne
    Age
    35
    Posts
    1,522

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    The spindle is out again, hopefully for the last time!

    I went to increase the bearing preload but it was absolutely rock solid. I very thoroughly examined the spindle run out both on the face of the register and the taper itself, radial run out was virtually zero but i did notice when i changed the direction of rotation (just by hand) the spindle would wove forwards or backwards by .008mm or so. It seems as though they have worn their races, but only axially? It seems very strange but at any rate ill replace them.

    I have not yet pulled them apart, just measured them. The dimensions seem a bit strange as i understood they were 20212 bearings whose nominal are 110mm OD 60ID and 22mm thick but when i measured the thickness i got 21mm. do angular contact thickness get measured in some strange way like only when unloaded? is 110x60x21 some previously standard bearing? FAG and SKF both do not list those dimensions.

    The only markings on the bearing other than low and high spot marks was N4589A

  4. #34
    Join Date
    Apr 2012
    Location
    Healesville
    Posts
    2,129

    Default

    I would have thought the brgs would be an imperial size?

  5. #35
    Join Date
    Aug 2015
    Location
    Melbourne, Australia
    Posts
    843

    Default

    Many bearings on old imperial or inch fraction machines are metric. Even the model T Ford was full of metric bearings. All the bearings in the Bridgeport I have just pieced together were metric (though one had an imperial OD) .

  6. #36
    Join Date
    Jul 2016
    Location
    Melbourne
    Age
    35
    Posts
    1,522

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    so far every bearing ive taken out has had whole metric dimensions, except the way bearings in the TTA they had 3/8" id. It helps as everything is still available.

  7. #37
    Join Date
    Aug 2008
    Location
    near Rockhampton
    Posts
    6,216

    Default

    If the internet is to be believed modern style ball bearings were invented in France thus that is why ball bearings are historically metric.

    Tapered roller bearings were invented in the US, that is why tapered roller bearings are predominantly imperial.

    In saying that I have found machines made in commonwealth countries liked to use now obscure imperial sized ball bearings.

    It is starting to look like CVA used odd sized bearings in their lathes. 21mm width is not the standard width.
    Gold, the colour of choice for the discerning person.

  8. #38
    Join Date
    Jul 2016
    Location
    Melbourne
    Age
    35
    Posts
    1,522

    Default

    Yeah I'm going to have to put in standard 22mm bearings and just shorten the spacers by the difference. I have been quoted $397 for a class 7 matched pair of Natchi bearings.

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