I have just purchased a Boxford Lathe

[123hotchef]

How to whack the 4 jaw on the 3 jaw was too small for the grease cover

 

[123hotchef]

Took 6mm off of the cover now I need to make the locking collar and straighten up the back of the chucks maybe even turn them down 2mm to match.

 

[Seadog]

I should get on and do mine. If you turn all of your chucks to the same dimension you could permanently clamp the collar to the spindle. It would mean splitting the collar part way through the circumference and use two independant clamp screws.

 

[123hotchef]

I should get on and do mine. If you turn all of your chucks to the same dimension you could permanently clamp the collar to the spindle. It would mean splitting the collar part way through the circumference and use two independant clamp screws.

Yes that was my thought with the 4 chucks I have even though I use the one 3 jaw for most of my work. I just need a bigger lathe @Pete. To skim a bit off the back of.the chucks I have

 

[Seadog]

A faceplate is what you need. Oh, you've got one

 

[eLuSiVeMiTe]

A faceplate is what you need. Oh, you've got one

Didn't want to say but...

 

[123hotchef]

I do lol how the fook do I clamp a chuck to the face plate

 

[eLuSiVeMiTe]

I do lol how the fook do I clamp a chuck to the face plate

Take the backplate off and use the Chuck mounting holes.

 

[123hotchef]

hey thats a good idea! just bolt it to the back plate it squaring it up will be a mission

 

[Pete.]

Turn a stepped plug to fit in the hole in the back of the chuck. Remove the jaws and put the face of the chuck against the faceplate. Secure with threaded bar through the spindle. Dial it in and turn the OD of the boss.

 

[123hotchef]

Turn a stepped plug to fit in the hole in the back of the chuck. Remove the jaws and put the face of the chuck against the faceplate. Secure with threaded bar through the spindle. Dial it in and turn the OD of the boss.

wow that is a great idea I love it! i need to turn a steeped plug then!? how do i do that i need to move the 2 slides together correct

 

[Pete.]

No, there are very few reasons for moving both dials together. All you are doing is putting a square step in it to keep the plug somewhat centred. You could use a large washer if you wanted to.

BTW in your pics above you should have turned the jaws around. You'd have a better grip on the part and less chance of hurting yourself on a sticking-out jaw.

 

[123hotchef]

Thanks Pete,
I did wonder about the jaws sticking out so far.
Oh I see what you mean it would be a steeped plug with a hole through the center for the threaded bar or bolt to hold it to the face plate.
How would I dial it in then?

 

[123hotchef]

Made a start on the plug today. Then got called to a party

 

[123hotchef]

That is the chuck back plate turned down ready

 

[eLuSiVeMiTe]

That is the chuck back plate turned down ready

Did you make a witness mark on the body and backplate so you can rebuild in the same position?

 

[123hotchef]

Did you make a witness mark on the body and backplate so you can rebuild in the same position?

Er no. Why are they balanced

 

[Seadog]

Strictly speaking it shouldn't be necessary. Having said that, I have marked mine. The resaoning being that it guarantees the concentricity of held parts. However, three jaw chucks aren't the most accurate and their accuracy also depends on the diameter of the piece being held (wear in the scroll and the chuck threads). There is a school of thoght that says you should make the locating register slightly smaller than the locating diameter in the chuck so that, by loosening the retaining bolts, you can bump the chuck and make it more concentric, similar to centring the workpiece with a four jaw. I've not tried it yet, but can see the value in doing it.

 

[Hopefuldave]

If the chuck is at least half decently made it shouldn't matter, the register in the back is the reference everything else is concentric / coaxial to. If it's a camlock or taper fit (D1) then it's a good idea to mark the backplate and spindle so it pulls down the same each time, if it's a bit sloppy.

Dave H. (the other one)

 

[123hotchef]

Well it has 3 chances of going back as it came off.