hello
welcome to Enots engineering i'm Alan
in today's video we start to make a rotary
broach from hemingway kits
now the instructions on the broach say start with the locking ring
but i've started with a shank because i haven't got a 1.7mm drill for the locking ring
the drill's on order and it's not arrived yet
so we'll start with the shank that's the shank
it's only a 10 mil diameter there
24 diameter there
two holes a slot milled through
and two counter bores on the back
so let's go into the workshop
and see how we do it
this is the project i'm going to start on this week
this is the box it arrived in
this is what you get in the kit it's a
compact rotary brooch from hemingway kits
you get some instructions nine pages of
instructions
with photos on how to set the part up and machine it
and three pages of drawings
and as usual with hemmingway kits the
drawings are detailed and clear
what else do we get in the box
piece of steel
another piece of steel and another piece
of steel
and a piece of silver steel
and then the bag with
a larger bearing and a small bearing
a thrust bearing and the two washers each side two cap heads and a small grub screw
the part we're going to make the shank this is 10 mil diameter 32 mil long
so we'll put the material in the chuck start on that
now this is a piece of one inch free cutting mild steel
it's about 65 millimeter long
and it says to hold it in a chuck with
about 50 mil protruding
and face off this end centre drill it
and then i can use the centre to support that
this is 0.396
which is 10.058 so it's
two thou up
this one's now 0.395"
10.033 so it's just a thou over and what i think i will do
is face the end
leave that as it is it can be polished
and remove the centre and just blend this it this bit
on the ending where i can't get in because of the centre
this parting off tool is definitely a
lot better
than the other type this is the blade type
saw how easy it was to part that off i
was expecting it to jam
up now and i was doing that
at the speed of 340 rpm
now i just want to skim up the outside
just to get it running through
i'm not taking too much off i just want
to get it running through
and i'll just take this edge off here
okay we've moved over to the mill i've
put the part we've just made in the mill
i've centered using my center finder
each side to get the center
now i'm going to come down with the tool
touch the top
zero and go down 0.25 mil
and come across
so
i've changed to an enemy
0.5 deep four mil wide
center drilling two holes
on each side
so
it's four mil deep
replace the milling cutter with the
drill so we can use it to line up the
hole
on the other side
move to the other side
replace the end mill and counter board
the second hole
we have the slot for the middle and two
counter board holes
from the back well that's a shank
finished
in part two we'll start on the next
component
oh well that's it for today hope that
was interesting hope you enjoyed it
and we'll continue this next time on
enots engineering
you
