data on cut disc

I tried to decipher all the data on a disc for
the angle grinder. Here is the incomplete
result:

#! /bin/zsh

# Symbols that seem to indicate:
# - use safety gloves, earmuffs, and goggles
# - for cutting only
# - read the manual
# - don't use a broken disc (?)
# - use to cut Inox or SS

# EN 12413
# a DIN standard: "Safety requirements for
# bonded abrasive products"

# 125*2.0/1.0*22.23
# outer_diameter*thickness/inner_diameter*thickness
# in mm

# MAX 80 m/s
# RPM 12200
# speed when disc is at 125 mm
# when disc is at 22.23, speed is 14 m/s!
# see program below to compute this

# AS 60 T INOX - BF
# INOX is again Inox/SS
# the rest I don't know

# Fe/S/Cl = 0.1%
# Some health related chemical property?

rpm2ms () {
local diam=$1 # e.g., 125 mm
local rpm=$2 # 12200 RPM
# ---------
# 80 m/s

local diam_in_m=$(( $diam / 1000.0 ))

local pi=3.14159265

local c=$(( $diam_in_m * $pi ))
local dist_per_min=$(( $c * $rpm ))
local dist_per_s=$(( $dist_per_min / 60.0 ))

printf 'm/s = %.0f\n' $dist_per_s
}

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