On Tuesday, December 12, 2017 at 1:57:41 PM UTC+1, Emanuel Berg wrote:
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
}
--
underground experts united
http://user.it.uu.se/~embe8573
What is next? Your chainsaw?
Lou