Reamer introduction
Our cartridge bearing reamers are made of HSS and hardened to 62+2 HRC. Carbide versions are also available for many calibers! For guidance in the barrel, they are equipped with an unhardened, rotatable guide bushing. If necessary, this bushing can be exchanged for a bushing with a different diameter (e.g. for POLYGON barrel). The flutes and the cartridge bearing profile are manufactured in one clamping on a 5-axis CNC machine using the deep grinding process.
In addition to an excellent cutting edge surface, this also results in smoother flutes, which enable better chip flow. The cutting edges of the reamer have an unequal pitch, which contributes significantly to reducing or avoiding "tool chatter" during reaming. Reamers up to caliber 500 N.E. are manufactured with 6 unequal pitch cutting edges.
Transitional reamers as well as the reamers for larger calibers and for shot from cal. 32 have 8 cutting edges. The shank is round ground with fit h7 and has a tool square at its end. Cartridge bearing reamers can be used by hand or with conventional machine tools. Additional devices such as stop rings for depth control or extensions for working through mounted lock housings facilitate handling.
Finishing reamers are manufactured with an allowance of 0.05 mm as standard. With proper handling ( low speed, uniform feed, sufficient supply of a suitable cutting oil as well as regular chip removal), 1 to 2 times factory regrinding is thus possible. In case of more severe wear, regrinding to the dimensions of a pre-reamer may be possible. Reamers with minimum dimensions for match or measuring runs are also available in almost all calibers. All lengths, diameters and angles are based on the "minimum bearing dimensions" of the current C.I.P. data sheets. However, cartridge bearing reamers can also be manufactured according to SAAMI dimensions, customer specifications (dimensions or sketch), sample cartridges or bearing castings.
Price list regrinding
We professionally regrind for you cartridge bearing reamers from our production from caliber 5.6×50 / .223 Rem.
Reamers for rifle cartridge bearings
This tool is used for pre-drilling the cartridge bearing. The reamer has a cylindrical shank for clamping in the machine and a square for driving by hand. The guide bush is replaceable and made of brass as standard.
Due to the large chip spaces, it is not necessary to unclamp as often as with a normal pre-reamer. The high-performance toothing results in short chips and a greatly reduced cutting pressure. Guide bushings with grooves are optionally available if the barrel is flushed with coolant from the front. The reamers can optionally be provided with hard coatings.
This tool is used for reaming the cartridge bearing. The reamer has a cylindrical shank for clamping in the machine and a square for driving by hand. The guide bush is replaceable and made of brass as standard. The dimensions of the reamer are 0.10mm below the minimum dimension according to CIP. This means that the cartridge bearing is pre-reamed very close to the finished dimension.
If a larger number of cartridge bearings are reamed, the use of a roughing reamer is recommended. Guide bushings with grooves are optionally available if the barrel is flushed with coolant from the front. The reamers can optionally be provided with hard coatings.
This tool is used for finishing reaming of the cartridge bearing, but without edge and without transition. The reamer has a cylindrical shank for clamping in the machine and a square for driving by hand. The guide bush is interchangeable and made of brass as standard. The dimensions of the standard finished reamer are 0.05mm above the minimum dimension according to CIP. This increases the service life and allows regrinding.
It is advisable to pre-machine with the roughing reamer or the pre-reamer. Particular care is required when cutting the pre-machined contour, as the reamer cuts almost over the entire length. Excessive retraction can lead to tool breakage. If narrow cartridge bearings are required, a finished reamer with minimum dimensions should be used. Optional guide bushings with grooves are available if the barrel is flushed with coolant from the front. The reamers can optionally be provided with hard coatings.
This tool is used for finishing reaming of the cartridge bearing, but without edge and without transition. The reamer has a cylindrical shank for clamping in the machine and a square for driving by hand.
The guide bush is replaceable and made of brass as standard. The dimensions of the standard finished reamer are 0.05mm above the minimum dimension according to CIP. This increases the service life and enables regrinding.
It is advisable to pre-machine with the roughing reamer or the pre-reamer. Particular care is required when cutting the pre-machined contour, as the reamer cuts almost over the entire length. Excessive retraction can lead to tool breakage.
If narrow cartridge bearings are desired, use a finished reamer with minimum dimension. Guide bushings with grooves are optionally available if the barrel is flushed with coolant from the front. The reamers can optionally be provided with hard coatings.
This tool is used to finish reaming the cartridge bearing with rim and with transition. The reamer has a cylindrical shank for clamping in the machine and a square for driving by hand.
The guide bush is replaceable and made of brass as standard. The dimensions are 0.05mm above the minimum dimension according to CIP. This increases the service life and enables regrinding.
It is advisable to pre-machine with the roughing reamer or the pre-reamer. Particular care is required when cutting the pre-machined contour, as the reamer cuts almost over the entire length. Excessive retraction can lead to tool breakage. If narrow cartridge bearings are required, use a finish reamer with minimum dimensions.
Guide bushings with grooves are optionally available if the barrel is flushed with coolant from the front. The reamers can optionally be provided with hard coatings.
If a cartridge bearing has grooves or chatter marks, these are often difficult to remove. Polishing or "sanding out" usually causes more damage than professional reworking with the appropriate tool. Since chatter marks cannot usually be removed with a tool with the same teeth, the spiral-toothed reamer was created.
It reliably ensures a smooth cut and thus a clean surface. Due to the small chip spaces resulting from the large number of teeth, the spiral-toothed reamer can only be used for reworking. It is advisable to select the dimensions so that the cartridge bearing is not too large, but all the scores are still removed. This reamer is only available as a special design.
Reamers for shotgun shell bearings
This tool is used for pre-drilling the cartridge bearing. The reamer has a cylindrical shank for clamping in the machine and a square for driving by hand. The guide bush is replaceable and made of brass as standard. Due to the large chip spaces, it is not necessary to chip out as often as with a normal reamer.
The high-performance toothing results in short chips and greatly reduced cutting pressure. Guide bushings with grooves are optionally available if the barrel is flushed with coolant from the front. The reamers can optionally be provided with hard coatings.
This tool is used to finish reaming the cartridge bearing, but without .edge. The reamer has a cylindrical shank for clamping in the machine and a square for driving by hand. The guide bushing is interchangeable and made of brass as standard. The dimensions of the standard finished reamer are 0.07mm above the minimum dimension according to CIP. This increases the service life and allows regrinding.
It is advisable to pre-machine with the pre-reamer. Particular care is required when cutting the pre-machined contour, as the reamer cuts almost along its entire length. Excessive retraction can lead to tool breakage. If narrow cartridge bearings are required, a finished reamer with minimum dimensions should be used. Optional guide bushings with grooves are available if the barrel is flushed with coolant from the front. The reamers can optionally be provided with hard coatings.
This tool is used to finish reaming the cartridge bearing with rim and with transition. The reamer has a cylindrical shank for clamping in the machine and a square for driving by hand. The guide bush is interchangeable and made of brass as standard. The dimensions of the standard finished reamer are 0.07mm above the minimum dimension according to CIP. This increases the service life and allows regrinding.
It is advisable to pre-machine with the pre-reamer. Particular care is required when cutting the pre-machined contour, as the reamer cuts almost along its entire length. Excessive retraction can lead to tool breakage. If narrow cartridge bearings are required, a finished reamer with minimum dimensions should be used. Optional guide bushings with grooves are available if the barrel is flushed with coolant from the front. The reamers can optionally be provided with hard coatings.
Reamers for handgun cartridge chamber
This tool is used for reaming the cartridge chamber of pistol or revolver cartridges. The reamer has a cylindrical shank for clamping in the machine and a square for driving by hand. The guide bush is interchangeable and made of brass as standard. The dimensions of the reamer are 0.10mm below the minimum dimension according to CIP. This means that the cartridge bearing is pre-reamed very close to the finished dimension.
On the case mouth abutters, the transition is cleanly cut by a through-ground cutting edge. The five other cutting edges have a recess to produce the contact surface for the cartridge. Optional guide bushings with grooves are available if the barrel is flushed with coolant from the front. The reamers can optionally be provided with hard coatings.
This tool cuts the bullet transition area. This tool is especially needed for gas pressure measuring runs. By separating it from the finishing reamer, the depth of the transition can be varied. The transition reamer usually has 8 cutting edges which results in a finer tooth pitch and thus a softer cut. The reamer has a straight shank for clamping in the machine and a square shank for driving by hand. The guide bush is replaceable and made of brass as standard.
The dimensions of the G1 diameter for reamers with cylindrical part are 0.03 mm above the minimum dimension according to CIP. This increases the service life and enables regrinding. Since the bullet transition sometimes has very small angles, cutting must only be carried out with great care and very little pressure in order to avoid hooking of the cutting edges. For better guidance, the use of a centering cone is recommended. Guide bushings with grooves are optionally available if the barrel is flushed with coolant from the front. The reamers can optionally be provided with hard coatings.
This tool is used for finish reaming the chamber of pistol cartridges. The reamer has a cylindrical shank for clamping in the machine and a square for driving by hand. The guide bush is interchangeable and made of brass as standard. The dimensions of the complete reamer are 0.05mm above the minimum dimension according to CIP. This increases the service life and allows regrinding. It is advisable to pre-machine with the pre-reamer. If narrow cartridge bearings are required, a finish reamer with minimum dimension should be used.
Particular care is required when cutting the pre-machined contour, as the reamer cuts almost along its entire length. Excessive retraction can lead to tool breakage.
In the case of the case mouth abutters, the transition is cleanly cut by a through-ground cutting edge. The five other cutting edges have a recess to produce the contact surface for the cartridge. From the 2006 production onwards, all cutting edges are provided with the edge for the contact surface. The ground-through cutting edge and the recesses are eliminated. Guide bushings with grooves are optionally available if the barrel is flushed with coolant from the front. The reamers can optionally be provided with hard coatings.
This tool is used for finish reaming the chamber of revolver cartridges. The reamer has a cylindrical shank for clamping in the machine and a square for driving by hand. The guide bush is interchangeable and made of brass as standard. The dimensions of the complete reamer are 0.05mm above the minimum dimension according to CIP. This increases the service life and allows regrinding. If narrow cartridge bearings are required, a finish reamer with minimum dimension should be used. It is advisable to pre-machine with the pre-reamer. Particular care is required when cutting the pre-machined contour, since the reamer cuts almost along its entire length.
Excessive retraction can lead to tool breakage. Since the edge is also cut by the reamer, the bearing depth depends on the shutter distance. If a different bearing depth is required, a finished reamer (without rim) can be used. Guide bushings with grooves are optionally available if the barrel is flushed with coolant from the front. The reamers can optionally be provided with hard coatings.