Boxford 280 Tail stock

[David Standing 1Participant @davidstanding1]

 

 

 

Jason

Here's a photo of the key.

it is impossible to re-engage the quill incorrectly,(well, without employing the services of a 14lb sledge hammer).

As Lee says, you engage the key in the keyway, then there is about 50mm of free travel to push the quill back until the lead screw engages. Any problems with the keyway/key would be apparent in that 50mm or so distance between engaging the key, and engaging the leadscrew.

I do really think this may be a red herring, I am fairly sure (having looked at mine and partially dismantled it, and noting the scoring on Lee's quill); there is a foreign body trapped in the top of the quill/tailstock housing which is what is causing the jamming, and what caused the the scoring.

 

 

 

Edited By David Standing 1 on 09/10/2017 13:44:01

[Lee GouldingParticipant @leegoulding74917]

Hi David

If it is something stuck in there how would i best get the quill out… my guess is just hammer and bar from back

cheers

[David Standing 1Participant @davidstanding1]

Lee

I have a nasty suspicion you will have no other action.

HOWEVER, be very careful – do not use a thin bar – in the back of the quill is the leadscrew nut, and it will be bronze/gunmetal or similar i.e. soft.

If you have a piece of round brass bar a little less than the diameter of the tailstock bore, fine. If not what I would suggest is you go to your socket set, find a socket with an outside diameter just less than the bore of the tailstock, fit a long enough extension bar, and use this as a drift to knock it out. The socket will then impact on the quill itself, and not the nut.

If you can stand the tailstock in the vice, in soft or lead jaws, on its end, tight enough in the jaws to support the casting but loose enough for the quill to slide through the jaws; even better, as all the driving force will be transferred to the quill.

I am betting it will tap out quite easily.

Photo of the tail end of the quill below.

I'm now going back to clearing out the workshop as my new Tom Senior horizontal mill arrives tomorrow!

[Lee GouldingParticipant @leegoulding74917]

Hi David

Big thanks for taking the time to write and post pics i really appreciate the advice

Cheers

[David Standing 1Participant @davidstanding1]

Lee

No problem, let's hope it pops out easily. Call if you get stuck.

Cheers

[Lee GouldingParticipant @leegoulding74917]

A few picks as promised Dave

[David Standing 1Participant @davidstanding1]

Lee

Thanks for the photos.

Out of curiosity, does the scar go back as far as the oiler in the headstock casing?

And per our conversation earlier, once the scars clean up it shouldn't affect operation.

Did you manage to free off the screw thread so it doesn't now bind in the feed nut?

Edited By David Standing 1 on 09/10/2017 20:57:17

[Lee GouldingParticipant @leegoulding74917]

Screw thread

[David Standing 1Participant @davidstanding1]

Lee

Thanks.

Sorry to be a pain, but can you post a picture of the screw out of the nut, and with the oil cleaned off?

To keep others in the loop, the quill is now out of the tailstock, but the feed screw is locking in the feed nut.

I suggested to Lee that he use a pick on the nut threads to clean out any swarf etc in the nut threads, but the feed screw still locks up solid in the nut after about 1".

The nut will not unscrew from the quill for further inspection (yes the grub screw was removed).

I can only assume that after force was initially used to try and wind the quill out, the feed nut or screw are damaged.

[Lee GouldingParticipant @leegoulding74917]

Hi David

Yes i will take pic and post later not able to do that at the mo and thanks for updating everyone i should have done that but just rushing last night and gutted i could get it to work

Thanks

[mark smith 20Participant @marksmith20]

When i first read this thread, i looked on google and came across someone else with a similar problem of the nut being galled onto the screw. It doesnt say what type of boxford though and from looking at the diagram it looks like my southbend .

**LINK**

[Lee GouldingParticipant @leegoulding74917]

Hi Mark

interesting find and could possibly try and force it through but maybe as a last resort

Cheers

[Lee GouldingParticipant @leegoulding74917]

Some pictures David of the thread it goes into the brass screw about 15mm max and then is really tight

The brass thread looks clean and clear but hard to see the bottom of it as you know

[David Standing 1Participant @davidstanding1]

Lee

Turns one and two of that thread look like they are burred over.

I believe that is an Acme thread form, in which the root and crest are parallel, and the angle is 29 degrees.

The start of the screw looks very suspicious, as none of the Acme thread form is rounded, it is all angular and sharp edged.

A photograph of the front end of the screw at a slight angle, and closer if possible, would confirm.

[Lee GouldingParticipant @leegoulding74917]

Closer pic of screw front does look rounded

[David Standing 1Participant @davidstanding1]

It does.

The edge of turn one doesn't really matter as it is the lead in, but whilst the back of turn two looks ok, it looks like the front of the thread has been pushed down into the the thread root.

If that is the case, your best bet is probably to try and dress it out back to the correct thread form with a flat needle file (ideally one with a plain edge).

[Lee GouldingParticipant @leegoulding74917]

Hi David

I’ve had a go at dressing it best I can but still hits a tight spot 😂

[David Standing 1Participant @davidstanding1]

Lee

Before the last photo, or after?!

If after, another photo required lol!!

 

 

 

 

Edited By David Standing 1 on 10/10/2017 18:36:04

[Lee GouldingParticipant @leegoulding74917]

Will do pic in a bit pal 😀

Probably not dressed it right 😂

[Lee GouldingParticipant @leegoulding74917]

Hi All

Massive thanks to you all for contributing and massive thanks to David Standing for the extra mile and phone chat

Eventually after trying my best to dress the thread it was still a little tight but thought I would put it back together so I could apply a little more pressure using the wheel and to my surprise the thread went though and is now running better than ever.. hope it remains that way

Thanks again everyone

https://youtu.be/pnwd46Rjiw0

[David Standing 1Participant @davidstanding1]

Result!

And you're welcome

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