[Jewelry making - Article 01226] - Re: [Orchid] A Wayward sawblade

[Ian W. Wright]

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    he only thing that governs which way a jewellers' saw cuts is the
    blade - assuming that, as you say, the frame is not twisted and that
    the blade is held square to the frame. If the teeth are not set
    evenly, i.e. if the ones on one side are pushed more away from the
    central axis than the ones on the other side, or if they are sharper
    on one side than the other, then they will automatically cut more to
    one side than the other and the saw will wander. This situation
    occurs with a lot of the less expensive or more haphazardly produced
    blades. There are basically two methods used for making jewellers'
    saw blades - 1. the teeth are punched into the edge of a sheet of
    steel, they are set and the blade is then cropped to width with a
    shear or 2. the blade is made from flattened steel wire and the teeth
    are milled into the edge. The former method automatically produces a
    flash or burr on one side of the teeth and along the back and the
    quality of the blade depends upon whether the manufacturer carries
    out the added stage of sharpening and de-burring the steel after
    initial punching - many do not. The wire method is used mainly by the
    Swiss manufacturers and produces a better blade with much less burr
    and none at all on the back of the blade. I would suggest that you
    try blades from a different source and, if possible, examine them
    before buying them. Also, if they are the flat, cropped from sheet,
    type, I also run a fine oilstone along the back of the blade before
    use (being careful not to blunt the teeth !) 

Best Wishes,
Ian
Ian W. Wright
Sheffield  UK

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