#!/bin/bash

echo "Setting Directory ownership" &&
chown -R root:root /var &&
chown -R man:root /var/cache/man &&
chown -R www-data:www-data /var/cache/lighttpd &&
chown -R libuuid:libuuid /var/lib/libuuid &&
chown -R smmta:smmsp /var/lib/sendmail &&
chown -R mysql:mysql /var/lib/mysql &&
chown -R www-data:www-data /var/log/lighttpd &&
chown -R mysql:adm /var/log/mysql &&
chown -R www-data:www-data /var/run/lighttpd &&
chown -R mysql:root /var/run/mysqld &&
chown -R smmsp:smmsp /var/run/sendmail/msp &&
chown -R smmta:smmsp /var/run/sendmail/mta &&
chown -R smmta:smmsp /var/spool/mqueue &&
chown -R smmsp:smmsp /var/spool/mqueue-client &&
chown -R root:staff /var/local &&
chown -R root:mail /var/mail &&
chown -R root:smmta /var/run/sendmail &&
chown -R root:smmsp /var/run/sendmail/stampdir &&
chown -R root:crontab /var/spool/cron/crontabs &&
chown -R www-data:www-data /var/www &&
echo "Setting File ownership" &&
chown root:smmsp /var/lib/sendmail/dead.letter &&
chown root:adm \
/var/log/auth.log \
/var/log/boot \
/var/log/daemon.log \
/var/log/debug \
/var/log/dmesg* \
/var/log/fsck/checkfs \
/var/log/fsck/checkroot \
/var/log/kern.log \
/var/log/lpr.log \
/var/log/mail.err \
/var/log/mail.info \
/var/log/mail.log \
/var/log/mail.warn \
/var/log/messages \
/var/log/news/news.crit \
/var/log/news/news.err \
/var/log/news/news.notice \
/var/log/syslog \
/var/log/user.log &&
chown root:utmp \
/var/log/lastlog \
/var/log/btmp \
/var/log/wtmp \
/var/run/utmp &&
chown root:smmsp \
/var/run/sendmail/mta/smsocket \
/var/run/sendmail/stampdir/reload &&
chown -f root:smmsp /var/run/sendmail/mta/sendmail.pid &&
chown mysql:adm \
/var/log/mysql.err \
/var/log/musql.log &&
chown -f mysql:adm /var/run/mysqld.pid &&
echo "Done."


In addition you will need to set the ownership permissions of /var/spool/cron/crontabs/<user> and /var/mail/<user> depending on the users on the system.

The required software can be installed using

sudo apt-get install ffmpeg dvdauthor growisofs

First off the video file has to be transcoded into an dvd compatible mpeg2 file.

ffmpeg -i <input_file> -aspect 16:9 -target pal-dvd output.mpg

Then the file has to be authored into the correct VOB files using dvdauthor. To make sure that there are no errors in the process the following environment variable must be set.

export VIDEO_FORMAT=PAL

Rather than using an xml control file for simple DVD’s the following two dvdauthor commands will suffice.

dvdauthor -o DVD/ -t output.mpg &&
dvdauthor -o DVD/ -T

Finally the files are burned to DVD media using growisofs

growisofs -dvd-compat -Z /dev/dvd -dvd-video -V "<DVD_TITLE>" ./DVD

With minimal filing the standard ATX power supply grommet hole can be opened out to fit a standard XLR socket. I used a female socket as opposed to the male socket mounted on the reprap. This is standard practice and ensures that the pins of the socket cannot be touched if the connector is removed. In general the live end is protected and the cold end is not.

It really is amazing how well this technique works, the drill bit doesn’t have to be perfectly centered but because the work piece is spinning around a central axis its near impossible not to get the hole dead centre. I guess this is why a metal lathe has the drill bit set-up in the tail-stock.

Here is the hobbed insert with the central hole:

I am very pleased with the result, as it runs nice and true when rotated. All I have to do now is drill the M3 grub screw hole.

Below is my setup using a drill stand. The 12mm round brass bar is held using a U-Shaped wooden clamp that mounts some 6901ZZ bearings, with an ID of 12mm and an OD of 24mm. I created some dimples on the 12mm brass bar with a punch to create an interference fit in the bearings. This stops things sliding around whilst doing the hobbing. One advantage of the drill stand (which is normally a disadvantage) is that it can swivel around the support pillar. So I was able to push the M3.5 tap closer and closer to the brass bar by pulling the handle to clockwise.

The next problem is how to drill a hole perfectly central down the middle for an m4 tap, again without a lathe. In the meantime the Conrad M4 Inserts have arrived in the worlds most ridiculously over sized box:

Everything went together fairly easily, there were a few minor errors in the assembly instructions which I corrected. The only trouble I had was with Adrian’s geared extruder driver. The base has countersunk holes to fit the heads of M4 bolts, however they were not big enough and reaming them out to 7mm I almost drilled right through. I also felt that the extruder design in general was a bit “bitty” and so I am re-designing the thing from scratch. Here is a sneak peek

The following view shows the lower half of my redesign of the axle mount, it fully encapsulates the bearing rather than having them floating free. (The image shows two separate parts which would be bolted together)

I am intending to also use my internal teeth gear concept with this design

I also designed a hobbed m4 insert

The hobbed insert will soon be available to buy courtesy of raysu in his ebay shop. Price is currently TBC, but he offers similar items at around $8.50