55° Rim Cutter
To be used with some types of Shot Gun reamers, without rim cut on reamer.
<-Back to topActual Size
The actual measured diameter of a reamer, usually slightly larger than the nominal size to allow for wear.
<-Back to topAxial Rake
Applies to angular ( not helical or spiral ) cutting faces. It is the angle between a plane containing the cutting face, or tangent to the cutting face at a given point, and the reamer axis.
<-Back to topAxial Relief
The relief measured in the axial direction between a plane perpendicular to the axis and the relieved surface. It can be measured by the amount of indicator drop at a given radius in a given amount of angular rotation.
<-Back to topAxis
The imaginary straight line which forms the longitudinal center-line of a reamer, usually established by rotating the reamer between centers.
<-Back to topBack Taper
A slight decrease in diameter from front to back in the flute length of reamers.
<-Back to topBevel
A non-cutting, unrelieved angular surface on the pilot of piloted reamers.
<-Back to topBody
The fluted full diameter portion of a reamer.
<-Back to topBore Reamers
Bore Reamers are used to create perfect size and finish in a rifle or pistol barrel.
<-Back to topBreech Tool
Ream the correct angle for different actions.
<-Back to topCarbide
Material used for reaming some stainless, titanium, stellite, or chrome lined barrels.
<-Back to topCarbide Type Bushing
.750 Long with oil grooves ground in the outer diameter.
<-Back to topCenter Reamer
Machine true to bore centers for turning or grinding the O.D. of a barrel.
<-Back to topChamber Angle
The angle between the axis and the cutting edge of the chamber measured in an axial plane at the cutting edge.
<-Back to topChamber Length
The length of the chamber measured parallel to the axis at the cutting edge.
<-Back to topChamber Reamer
Reaming the chamber for revolvers, pistols, Shotguns and rifles, also for making bump dies.
<-Back to topChamfer Relief Angle
The result of the removal of material behind or adjacent to the cutting edge to provide clearance and avoid rubbing,( heel Drag). It is measured perpendicular to the tool axis and across the margin.
<-Back to topChoke Tool
For removing and installing chokes on shotguns.
<-Back to topChucking Reamer
Fraction or decimal reamer to machine perfect hole size with smooth finish.
<-Back to topCircular Land
See the term “Margin."
<-Back to topClearance
The space created by the relief behind the margin of a reamer.
<-Back to topCore
The Central portion of a reamer below the flutes which joins the lands.
<-Back to topCore Diameter
The diameter at a given point along the axis of the largest circle, which does not project into the flutes.
<-Back to topCore Drills
Reamer to remove excessive material to leave cavity for finish work.
<-Back to topCounter Sinks
Counter sink fasteners, bolts, screws, or rivets so heads will not show.
<-Back to topCrown Cutter
Crown the chamber angle of the muzzle end of barrel for appearance and performance.
<-Back to topCounter Bore
To inside ream large diameter for actions or muzzle brake work.
<-Back to topDie Reamer
Reaming full length, resizing dies, and can double as a roughing reamer.
<-Back to topDirection of Rotation and Helix
The direction or rotation of the reamers covered herein is right hand. The terms "right hand" and "left hand" are used to describe the direction of flute helix.
<-Back to topDrill Sets
Decimal and Fraction Drills in Steel Storage box.
<-Back to topFlat Relief
A relieved surface behind the cutting edge which is essentially flat.
<-Back to topFlutes
Longitudinal channels formed in the body of the reamer to provide cutting edges, permit passage of chips and allow cutting fluid to reach the cutting edges.
<-Back to topFlute Length
The length of the flutes not including the cuter sweep.
<-Back to topForcing Cone
For reaming angle cones in shotguns mostly used by hand.
<-Back to topFreebore
The parallel Section of throat for bullet clearance or distance before bullet touches land. Also reloaders sometimes refer to this as Jump when setting up there round.
<-Back to topGash
The undercut formed between the major and the pilot diameters when the cutting edge is ground on piloted reamers.
<-Back to topHeadspace Gauge
to be used with chamber reamers to machine and ream correct depth of chamber.
<-Back to topHand of Flute Helix
A reamer has Right Hand Helix when the flutes twist away from the observer in a clockwise direction when viewed from either end of the reamer.
<-Back to topHeadspace Cutter
Creating perfect depth or Headspace of chamber.
<-Back to topHeel
The trailing edge of the land in the direction of rotation for cutting.
<-Back to topHelical Flute
A flute which is formed in a helical path around the axis of a reamer.
<-Back to topHelical Rake
Applies to helical and spiral cutting faces only ( not angular). It is the angle between a plane tangent to the cutting face at a given point on the cutting edge, and the reamer axis.
<-Back to topHelix Angle
The angle made by the leading edge of the land with a plane containing the axis of the reamer.
<-Back to topIndicator Rod
Used for precisely, indicating a rifle barrel in lathe before reaming.
<-Back to topIrregular Flute Spacing
A deliberate variation from uniform spacing of the reamer cutting edges.
<-Back to topLand
The section of the reamer between adjacent flutes.
<-Back to topLand Width
The distance between the leading edge of the margin and the heel measured at a right angle to the leading edge.
<-Back to topLeading Edge
The intersecting edge between the flutes and the margin.
<-Back to topMargin
The unrelieved part of the periphery of the land adjacent to the leading edge.
<-Back to topMuzzle Tool
To Machine Recess, Indent or Cavity for one piece muzzle brake machining.
<-Back to topNeck
The section of reduced diameter connecting shank to body, or connecting other portions of the reamer.
<-Back to topNegative Rake
Describing a cutting face in rotation whose cutting edge lags the surface of the cutting face.
<-Back to topNominal Size
The designated size of a reamer.
<-Back to topOverall Length
The length of the reamer from end to end but not including external centers.
<-Back to topPilot
The cylindrical portion preceding the major diameter of the reamer body.
<-Back to topPilot Length
The length of pilot from theoretical intersection of pilot diameter and chamber angle to end of reamer but not including external centers.
<-Back to topPositive Rake
Describes a cutting face in rotation whose cutting edge leads the surface of the cutting face.
<-Back to topPrimary Relief
The relief immediately behind the cutting edge or margin. Properly called relief.
<-Back to topRadius Cutter
Cutting convex or concave radius. There are many usage and forms.
<-Back to topRake
The angular relationship between the cutting face, or a tangent to the cutting face, at a given reference plane or line.
<-Back to topReamer
A rotary cutting tool with one or more cutting elements used for enlarging to size and contour a previously formed hole. Its principal support during the cutting action is obtained from the work piece.
<-Back to topRelative Chamber Lip Height
The difference in indicator reading of the chambers of the reamer. It is measured at a right angle to the chamber at a midpoint along the chamber.
<-Back to topRelief
The result of the removal of tool material behind, or adjacent to, the cutting edge to provide clearance and prevent rubbing (heel drag).
<-Back to topRelief Angle
The angle, measured in a transverse plane, between the relieved surface and a plane tangent to the periphery at the cutting edge.
<-Back to topRivet Shavers
Carbide tools to ream flush the heads of rivets to a flush fit.
<-Back to topRotating Pilot
Reamer with a rotating bushing held in with a screw or snap ring.
<-Back to topRougher
Removes excessive material before finishing with the finish chamber reamer.
<-Back to topScope Reamer
For reaming the alignment of scope rings during the assembly and attachment of scope.
<-Back to topSemi Finishers
Semi-Finishers are used in high production shops before the finish reamer.
<-Back to topShank
The portion of the reamer by which it is held and driven.
<-Back to topSolid Pilot
Reamer with a non-rotating bushing reamer with a fixed pilot.
<-Back to topStandard Bushing
.500 long with smooth finish for steel chamber reamers.
<-Back to topStraight Flute
A flute parallel to the tool axis lying in an axial plane.
<-Back to top