Questions and answers
Why does TRIEBEL manufacture full calibration matrices predominantly with 1 1/4" external thread?
You have to imagine the process like this:
With a piece of steel with a fibrous structure like wood, a wedge with a very flat pitch is pressed into an axial bore with a force of approx. 1 - 1.5 tons (10 kN 15kN). The forces that occur force the piece of steel (the calibration die) radially apart. The forces are so great that it repeatedly causes a die body to crack. The only remedy for this is to use more solid press dies. The difference in the calibration process is so serious that if you have not tried it yourself, you will not believe it. A calibration die with a large outer diameter results in a much easier calibration process simply because the die practically does not spring. This also results in much more consistent dimensions in the calibrated cases. The cartridge cases and the press are protected because less force has to be applied overall. Screwing in these dies with the 1¼"12Gg thread is possible in most presses. In most cases, only one threaded insert has to be removed from the retaining plate. Since the newer presses are equipped with a 1.5"-12Gg thread, a corresponding reducing insert for the 1¼"12Gg thread must be used. This is offered by the company Triebel Waffenwerkzeuge.
Overview of the various factors influencing shot accuracy.
With the almost unmanageably large number of more or less different calibers, there are some possibilities to possibly put the wrong cartridge into the stock...
Part of the edge of an edge gauge has broken off during use. Is there a material defect? How can this be prevented?
Cartridge bearing gauges must be hardened against wear. To prevent the rim, which can be very thin in certain cases, from breaking immediately, the hardness is approx. 58 - 60 HRC. Nevertheless, it can happen, especially with break-barrel guns, that due to one-sided loading, (the butt plate of the bascule is not exactly at right angles to the bore axis), part of the rim breaks off. In this case, the breech of the gun must be closed with care. Also, the extractor claw on self-loading weapons must not hit the gauge with momentum. If necessary, remove the extractor.
In addition to the use of measuring instruments of various kinds, gauges for checking a wide range of dimensions are a good method of testing. Here you can find out more about the application of our cartridge bearing gauges, among other things.
Is it possible to regrind TRIEBEL cartridge bearing reamers?
Basically YES! Our finished reamers are usually manufactured with an appropriate stock allowance. Minimal reamers can also be reground and used as pre-reamers.
We offer regrinding of cartridge bearing reamers as a service!
Of course, we also offer cartridge bearing reamers made of solid carbide. When used correctly, these tools produce a much smoother surface and offer a longer service life as well as significant time savings compared to HSS cartridge bearing reamers. In order to enable short delivery times, we also have a basic stock of reamer blanks in the common calibers. Prices and article numbers can be found in our catalog.
Longitudinal grooves in the cartridge bearing
With new, still very sharp cartridge bearing reamers, it can happen that the cartridge bearing has very fine longitudinal grooves. This is due to the excessive sharpness of the freshly ground cutting edges. Other causes are the barrel steel and possibly too loose clamping in the machine. These grooves can be prevented by using a very fine oil stone to take some of the sharpness off the cutting edge. You run very lightly over the cutting edges and "break" them a little. With a stable clamping and oil-water emulsion as lubricant, the cartridge bearing should then become smooth.
Tool breakage or breakage of cartridge bearing reamers
Although it is rare, it does happen from time to time that a cartridge bearing reamer breaks. This can be a partial breakout of a tooth or a complete breakage of the tool. The breakage of a tooth part is usually due to not removing the chips in time and occurs very rarely with the reamers whose flutes are ground into the solid. Further use of these reamers is possible if the fracture edge to the still existing tooth part is slightly rounded off with an oil stone to avoid scoring.
Material or hardness defects
Breakage of a reamer due to material or hardness defects is extremely rare. From the past 30 years, we know of very few cases that were due to this. Such material or hardness defects are usually detected during machining and the parts are rejected. They can be recognized by the different coloring of the fracture surfaces and run on different paths across the workpiece. Often, the fracture lines also originate from sharp-edged transitions.
Total breakage of cartridge bearing reamers is always due to overload and has a very characteristic appearance. The fracture surface spirals towards the axis of the tool and often shiny edges on the fracture surface are the indication that the ends of the broken reamer have been compressed with considerable force.
Particularly if you as a reloader attach great importance to precision, the neck of the cartridge case always comes into focus. Every now and then, an inspection reveals that the concentricity in the case neck area does not meet the desired requirements. An out-of-round case neck can mean that the bullet cannot be set correctly on the axis. The suspicion quickly arises that an adjustment to the die should remedy the situation. However, great attention should be paid first and foremost to possible unequal wall thicknesses of the cartridge case. Even the best die can hardly compensate for uneven case wall thicknesses. If you are faced with the problem of crooked case necks after calibrating with a TRIEBEL die, please contact us. Together we will be happy to get to the bottom of the problem. In such cases, the entire system consisting of die, case, bullet and work process must always be considered.