Hello welcome to Enots engineering I'm Alan
In todays video we continue making the Hemmingway rotary broach
and were making the body of the broach
I think this is the most complicated part because it has a lot of internal bores for bearings and threads
So lets go into the workshop and see how we do it
this is what were making today we start of with a hole straight through clearance
and this bore is holding the small bearing race
This bore is to hold the thrust bearing This bore is for the larger bearing
And then on the end here we have a thread which holds the locking ring in place
Start on the body
9.88
here's a tip I've held the bearing on a cap head with a nut at the back
so you can push it in and retrieve the bearing from the bore
and that's just started to go in
so at least you can get the bearing out when you push it in
that's the first bore done
That fits in there OK
polish that up and that will be OK
That should do
Thats ready now for the thread to be cut
Ok lets start to try the fit
Now lets try that for the fit
That should be alright
I will put the large bearing in that end
I will put some red felt tip on the outside edge
because I don't want to take anything off the length
Now we have to part this off just over 31mm its about 32
Ok now I have to turn it around put it back in the chuck and face it off to 30.8mm
Im just measuring this and its 32.7
lets have a look at that see what length that is
30.77
This is the part that we've just machined on the lathe
we faced of the locking ring the bearing is still in there
we faced the length and the diameter is roughly turned down because
there's some more to be machined off there yet
the next thing to do is is take it to the milling machine
machine a flat on each side and we will start that in next weeks video
well that's it for today thanks for watching
hope you enjoyed it look after yourself and we will see you
next time on Enots engineering