=Broach.= A toothed tool for cutting the walls of a hole.
=Broaching-press.= A machine that forces a broach to its cut.
=Bunter-dog.= A work-gripping device for a planing machine, and consisting of a piece having a hook end to engage in the T-slot of the table, and a set-screw to bind the work.
=b.u.t.t-joint.= A riveted joint in which the ends of the plate abut fair, one against the other.
=b.u.t.t-strap.= A strip or band of iron employed to hold the joint together in a b.u.t.t-joint.
=b.u.t.t-weld.= A weld in which the end of one piece merely abuts against the other when the two pieces are put together to weld.
=Buzz-planer.= A wood-planing machine in which the work is fed by hand.
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=Calender-roll.= A roll for calendering paper.
=Caliper-gauge.= A gauge in the form of a solid caliper.
=Calipers.= A hinged tool for measuring work.
=Cam.= A revolving disc whose actuating surface is not a true circle.
=Cam-motor.= A cam together with the rod it actuates.
=Cap.= The plate or upper part of a bearing that holds the top half of the box or bra.s.ses in place.
=Cape-chisel.= A narrow machinist"s chisel.
=Caps.= The backward curves on the points of file teeth.
=Cap-screw.= A screw with a collar and a square head.
=Carrier.= A device for driving lathe work.
=Case hardening.= A process of hardening the surface of wrought iron, the hardening usually extending about 1/32 inch in depth.
=Cat-head.= A sleeve fastened by set-screws to slender lathe work and running in a bearing so as to steady the work.
=Caulking-tool.= A tool used for caulking riveted joints and in making rust-joints.
=Centre-bit.= A bit having a triangular conical point with its cutting edge on one-half of the end and a spur on the other half.
=Centre-punch.= A tool having a coned point for marking the centres to work.
=Chamfer.= A facet that removes the corner of a right angle.
=Change-gears= _or_ =change-wheels.= The gear wheels employed to change the revolutions of a lead screw or feed motion.
=Chaser.= A toothed tool for cutting threads by hand in a lathe.
=Check.= A crack.
=Check nut.= A second nut screwed against the first to check it from slackening back.
=Chip-break.= A piece that rests upon the work of a wood-working machine and prevents the cutter from splitting out the wood as the cut leaves the surface.
=Chipping-hammer.= A machinist"s hand hammer.
=Chips.= 1. The cutting from a metal cutting machine tool. 2. The thick cuttings from a wedge-shaped wood-working tool, as from an axe or adz.
=Chisel.= A wedge-shaped tool.
=Chisel-tooth saw.= A saw having inserted teeth with a maximum of front rake.
=Chop= _or_ =hammer-sink.= A mark left on a plate by a sawmaker"s or plate straightener"s hammer.
=Chord-pitch.= The pitch of gear wheel teeth measured in a straight line.
=Chuck.= A work-holding or tool-holding device.
=Chucked.= Held in a chuck.
=Chucking-lathe.= A lathe having a large face plate for chucking purposes, and usually a short bed.
=Chuck-plate.= A large face plate on which work may be chucked.
=Circular saw.= A saw having its teeth arranged around its circ.u.mference.
=Clamp.= A device for fastening or holding work together or to some other part.
=Clearance.= 1. The amount to which one piece clears or escapes another.
2. On a lathe tool, clearance is the amount to which the back face of the tool escapes the metal it is cutting.
=Clements driver.= A device for driving work in a lathe, and that places an equal strain on each end of the lathe dog or carrier.
=Clutch.= A device for engaging or disengaging so as to cause the motion of one piece to be communicated to another, or to stop such communication.
=c.o.c.k.= A device for opening or closing the bore of a pipe.
=Cog.= A wooden tooth for a gear wheel.
=Collapsing-taps.= A tap that is so formed that its teeth close inwards when the thread is cut so that the tap can be withdrawn without winding it backwards.
=Collar.= 1. A disc-shaped enlargement on a cylindrical piece. 2. A hollow cylindrical piece containing a set screw, to prevent a shaft from end motion.
=Collet.= A casing for holding tools or drawers in position.