Hello welcome to Enots engineering I'm Alan this week I've got this
three-inch vice which is made for a rotary table and I'll be making some
nuts to fit the back so I can adapt these to fit on the compound slide on
the lathe so let's go to a workshop see how we do it.
Today I've got this small vice it's a three inch round vice for a rotary table.
It comes with three small T nuts and cap heads.
It's got three holes and the base that you can bolt your tee nuts to and also an extra hole here.
I think now about a six mil cap head
It has a V already machined into this and on the side on the bottom it's flat
This is my compound slide on the lathe and what I want to do is make some way
of fixing this onto the compound slide so when I do milling in a lathe I've got a small vice.
In the past I've used this vice which is a just has a block at the bottom.
This slides into the tool post t-slot locks up on a cam.
The problem with this it's not an accurate vice there is quite a lot of play in here.
The other problem is it stands away too far so you get a lot of leverage when you're milling,
and it's only held on a cam which I don't really like because if that vibrates loose the whole vice moves.
I thought it's about time I got a vice that's accurate, I can bolt onto the compound slide.
I thought I'd use a piece of bar machine to round nuts that way and I can control the diameter
So when I slide the tee nuts in I know the vice should be square to the compound slide.
This is 33mml as you can see the outside is very rough it's got dents and bumps in it.
I've clocked this up this DTI is ten thou per revolution.
the nearest I can get this is about 0.01" because of the finish on the outside
I've made a small threaded mandrel to hold the nuts I'm making.
So that will be held in the lathe and I will mill two flats one on each side.
to stop it turning in this tee slot
Now the tool holder I'm using has a Vee on the bottom so when I put the round
bar into that, it'll centralize it and I'm using these two clamping bolts to clamp it in position.
just setting in my tool holder square and I've done that by putting the Dial indicator on the edge of the tool holder.
and I'm just running it across, thats within a 0.001" over about four inches
so I know that my tall post is square in that axis and what I will do is take
this out put it in the other side
What I've done is brought it up to the end mill so it touches the face.
set my compound slide to zero
lock the saddle and wind is out, now I'll take a cut across that face
I've taken the cut across I've measured to diameter of what's left.
I need another 2mm to come off this face.
So I've set my dial indicator on the top of the tool holder
so now when i undo this by turning the tool adjustment screw
I can lift the tool holder up
I'm going to lock it I'll set it to zero to start with
so as I lock it now you can see I've hired that by 0.02"
I will re-lock the cap head on the top
and take another cut across
26.58mm and I needed it to be 25.1mm
I'll take another 0.02" off and recut again.
slacken off the screw release the tool holder.
turn it round tighten up the tool holder
I've just tightened the cap head up so the dial indicators gone from 20 to 40
and we'll take another cut
25.15 that's about 0.002" up I'll leave it at that.
Now I need to turn it around 180 degrees
and do the same on the other side
that's 0.05mm I think's about 0.002"
that'll do for that ready to mill the other side
there's the finished tee nut
So I'll put the other one in and do exactly the same again
I finish the second one and I'll remove any sharp edges with a file and then see if they fit.
okay these are the two t-nuts that fit in the Compound slide.
And you might be thinking why do I want two t-nuts
hopefully now this will fit on there and I can use tee nuts to bolt it down
Now with the t-nuts in position I can clamp that down so now I can put anything in there for milling
Don't forget this is normally used in my milling plate
This would be taken off.
That would normally be in this position so I can move it up and down
I can hold something in the vice I've got enough adjustments on there to that cover that vice.
If need be I can move this down into the second hole
and the top can swivel round to any angle that I may need.
Well that's it for today I hope you found that useful and we'll see you next time
on Enots engineering
Không có nhận xét nào:
Đăng nhận xét