Hello I'm Alan welcome to the Enots engineering in today's video we start
making the spindle for the drill grinding jig the spindle is turned
between centers some screw cutting on the end the taper for a er 20 colleagues
and we also mill some flats using the pedestal drill we'll also start making
the indexing ring so let's go into the workshop see how we do it
I've put my boring bar in the tool post and I just want to machine a chamfer on the
inside so that I can use for a centre. Because the drill has left a bit of a
burr on the end here I need to faace that off
That will fit in there nicely. I've turned it around in the chuck and I've
marked the length that I need to finish the collet holder
I've done this end exactly the same as the other end I've drilled the hole through
machined a thirty degree cone so my centers or fit I'm holding it true on
the center the tailstock revolving center.
Set up the lathe centers driving plate and the dog what I want to do is machine
this down to fit the spindle block up to about 20mm from the end
I've put my tool at an angle because I can't get right to the end now
I'm using the revolving centre and so the first job will do to true this up for the full length
I've just finished turning this between centers and before I take it out what I
want to do is put an undercut in the middle. So that will go in that way
put an undercut here so that this spindle lock doesn't damage the bearing surface
it's only a few thou to stop that. I will give that a polish
that's about five thou lower there than the rest. I will try that in the Bearing block
that goes in there gets tight. I'll just measure this thats 0.7145"
This is 0.715 so I've got 0.0005"
difference between going in so I need to polish off these 0.0005".
so I can get it to fit
Thats the block
That fits through now can rotate it
it's a bit tight but it will
slack off as I use it.
So next is to do this end
set up to cut a 1.5 millimeter pitch thread
set up the gears for cutting a one point five millimeter thread this is the tool
I'm using 60 degree the problem I have on this
that's a normal thread setting gauge on this one the 60 degree you see being a
small tool the 60 degree you could put that anywhere on there most of the tool
is in the cut out on the end so what I've done is you to square against the
side of the tool to set it parallel with the bar another way of setting the
thread cutting tool square is to use your drive in place and just check that
it's square to the drive in play or if it works in the chuck you can use a flat
face of the jaw check your tools square to that. I've put some marking blue on the
the part I'll set my compound slide to 29 degrees
I'll just bringing this in
engage the lead screw
That should move forward
stop it at the end I've set my cross slide to zero wind my cross slide out
reverse the lathe
wind the cross slide back into zero add another cut on
I've made a cut try my thread gauge that's the right pitch 1.5mm
back off the cross slide reverse
Put the cross slide back to zero and put the cut on with the compound slide
that's it. So that's the thread finished
the next job is to bore out this put a taper in there for an ER 20 collet
I'll put the three jaw chuck back on and then set
this up so that this is running true this end then I can bore the taper
I've clocked this up to get it running true thats the run out on it about a 10th
I'm setting it to the spindle because obviously that's what's going to locate
in the grinding fixture so now I want to bore the taper for the ER20 Collet
I'll set the angle to about 8 degrees
I'll finish the taper I've just polished it with some emery cloth using the stick.
I've tried two methods of getting the angle one using a dowel pin in the collet
so that it doesn't spring and I find this is a bit
you've got no feedback off it. the other method is just using the collet you
can feel when it grips I don't know if you can see the bore, you can see that
it's blue where the collets been touching so that's okay the other thing is this
groove should be there just under five mm which that is so that's virtually
finished now all I need to do is take the sharp edge off there so I'm just
putting a chamfer on the inside be careful when you do this because don't
put your finger in the bore because it's sharp edges and being a taper it will
grip your finger especially the chuck's turning.
just put the collet in the nut should go on okay
The only problem is I've got no fine feed on the down, so I'm just having to tap it
that just fits on there so far we've got this can move around this can turn
we can lock it with the spindle lock so the next thing we need to do is
a feed in system that we can feed the spindle into the grinding wheel and also
some sort of system to index it and the cutting edges on the drill.
so now 1.350"
I've put my Centre in just to support it stop it vibrating
I've cut agroovy in here using my parting off tool that's about 3mm deep
and now I'm going to part this off on this end
Thats the part of just be making, I've cut a groove in there
The next thing I want to do is drill
a hole through tap it M5 and put a grub screw in too lock this collar onto the
spindle
oh well that's it for today we'll finish
the indexing ring off next week I hope you enjoyed it and see you next time
on Enots engineering