Fig. 1624.
[Fig. 1624] represents a chucking device useful for supporting or packing up work, or for adjusting it in position ready to fasten it to the work table, it being obvious that its hollow seat at a enables it to set steadily upon the table, and that its screw affords a simple means of adjusting its height. It may also be used between the jaws of a connecting rod strap or other similar piece of work to support it, as in [Fig. 1625], and prevent the jaws from springing together under the pressure of the tool cut.
Fig. 1625.
Fig. 1626.
Another and very useful device for this purpose is shown in [Fig. 1626], consisting of a pair of inverted wedges, of which one is dovetailed into the other and having a screw to operate them endwise, the purpose being to hold the two jaws the proper distance apart and prevent their closure under pressure of the planer vice jaws. It is obvious that the device in [Fig. 1625] is most useful for work that has not been faced between the jaws, because the device in [Fig. 1626] would, upon rough work that is not true, be apt to spring the work true with the inside faces, which may not be true with the outside ones, and when the wedges were removed the jaws would spring back again, and the work performed while the inverted wedges were in place would no longer be true when they were removed.