Shank Chisels

The shank chisels made by RENNSTEIG serve the ranges of electric and pneumatic hammers of almost all important manufacturers. The tools are used for break and demolition works as well as general chisel work in industry and at home. The right selection of shank chisel , correct length and hammer type guarantee an optimum power transmission from the hammer via the chisel to the material to be worked with minimum effort for the operator.

RENNSTEIG shank chisels meet or even exceed high quality standards. By using high-grade materials and applying sophisticated technologies for the manufacture and heat treatment, the shank chisels are featuring a high serviceability. Aftertreatment, i.e. regrinding or reforging, can be done without any problems.

Shank chisels are subject to high stress. In order to extend the service life of the tools, the below instructions should be followed:

• regular and repeated greasing of the shank end to be fitted into the hammer
• avoidance of chisel breaking caused by excessive space between chisel and the part of the hammer the chisel is fitted into
• selection of correct position towards the working plane
• avoidance of overheating both at the shank end and the cutting edge
• short impact intervals and gradual treatment of the material to be worked
• regular regrinding of the worn cutting edge

As for health and safety standards and to avert accidents when working with electric and pneumatic hammers please follow the rules below:

• always wear safety goggles (to avoid eye injuries that might be caused by splintering material)
• short work intervals to not overstrain the wrists
• working with a perfect cutting edge in order to prevent recoils, breaking of the tools as well as to avoid overstraining of joints

Due to an inevitable wear and tear of the cutting edge when working with shank chisels, the aftertreatment of the tools is a matter of great significance. Acc. to the degree of wear and tear on the cutting edge, two different aftertreatment procedures have to be applied:

• regrinding
  (in case of lower wear and tear of cutting edge )
  - in short intervals
  - avoid excessive grinding heat in order to avoid as a consequence reduction of hardness and possible grinding cracks
  - ensure water cooling during regrinding process
• reforging
  in case of heavy wear and tear by obeying the following instructions:
  forging
  heating of the forging range (cutting edge + 30mm)
  up to a forging temperature of 950° to 1050°C
  hardening
  in accordance with the material used, heating up to hardening temperature (790° to 880°C)
  and immediate quenching in oil afterwards
  tempering
  heating up to tempering temperature of approx. 280° C

After heat treatment the cutting edge has to be reground.

Reforging and the subsequent heat treatment should only be done by trained and experienced people.