Another Clock Related tool

[modeng2000]

Is it a device to hold a screw by its head for machining?

John

 

[tmuir]

Is it a device to hold a screw by its head for machining?

John

Got it in one.
I thought it would take a few more guesses.

 

[Lew Hartswick]

I don't get it. Show us how you use it.
...lew...

 

[modeng2000]

Sorry to spoil the fun!
I have made one much like yours. Mine has a series of discs that are held in place inside the nut by a lip on the the face of the nut. Each disc has a plane hole to accept a screw size and the screw is held tight by the bolt section pressing on the screw head when it is screwed into the nut.

 

[tmuir]

Hi Lew,
Its will be as modeng2000 said.
Its not finished yet and the plate still needs to be fixed to the nut and then drilled out to give a lip to hold little brass plugs that the screws fit through.
Once I've finished it, it will make more sense.

 

[Maryak]

I don't get it. Show us how you use it.
...lew...

Me neither.

Best Regards
Bob

 

[steamer]

By indexing the 6 sides of the hex fixture in the vice, you bring the six sides of each bolt in turn with the mill spindle...?

I think you would need multiple spindle positions to do this though right? ???

help me out here.......

Dave

 

[tmuir]

The nut isn't for indexing it is just a means of clamping the screw.

I hope to have it finished tonight so will post more photos in a few hours

 

[tmuir]

Here is the nut with it's cover screwed on.

8mm hole drilled and reamed in cover.

Tool holder finished with a holder for 4BA screws

Screw in holder

Set up in the lathe ready to be able to machine the end of the screw

Tool with another holder drilled for 4mm screws and the 4BA adapter in front of it.

Still need to make holders for 6 and 8BA screws but ran out of time tonight.

Its a pretty simple tool but does a useful function.

 

[mklotz]

ISTR hearing this device referred to as a "lantern chuck". Is that correct or am I suffering from CRS syndrome?

 

[tmuir]

A lantern chuck does exactly the same thing but looks different.

It has open sides.

Had a quick look for pictures but this is the best I could find.

 

[RobWilson]

Hi Tony

Here is a better photo of a lantern chuck

Regards Rob

 

[mklotz]

Ok, that looks a lot more like a lantern which suggests where the name originated.

So, what is the purpose of the open sides?

 

[tmuir]

So, what is the purpose of the open sides?

I have no idea to be honest except it would make it lighter which would be an important thing for watch maker lathes.
Maybe someone here can tell us both.

 

[RobWilson]

So, what is the purpose of the open sides?

Hi So that the part can be removed without having to completely dismantle the chuck.

Regards Rob

 

[mklotz]

Thanks. That makes sense.

I suppose that horologists use this tool mostly for very short screws so that overhang isn't a problem.

If I wanted to dog point a long screw, I would make a dedicated split collet. In fact, I've done just that a few times.

 

[Maryak]

Tony,

Thanks now I understand. (The lantern came on :

)

Best Regards
Bob

 

[hmember]

Reminds me a bit of an item from the fertile mind of Frank Ford at his Frets site:

http://www.frets.com/HomeShopTech/Tooling/CapScrewHolder/capscrewholder.html

His is for hand-holding vs. chucking in a lathe, but they're both clever.

Digressing -- I like the notion of making tools with tools. In the link above he's making a tool to make a tool to make a tool, if you consider he made the shank bit to begin with . . .

 

[tmuir]

Reminds me a bit of an item from the fertile mind of Frank Ford at his Frets site:

http://www.frets.com/HomeShopTech/Tooling/CapScrewHolder/capscrewholder.html

There not tools, there works of art!.
I love those handles he put on them.

To make this tool I had to make the finger plate and the hand tapper first.
At the moment I seem to be constantly making a tool, to make a tool to make a tool.

Now that I have this finished I can make my die holder and have means to easily shape the ends of the screws to hold the dies in place.

So then I would of made 2 tools, to make a tool to make another tool.

It's never ending isn't it?

 

[tmuir]

Didn't get out into the workshop at all last week so I felt I had to go out and do something tonight.
Wasn't up for anything too hard tonight so just made a set of prising levers to help lift off stubborn parts.

They are 3 inches long and made from 3/16 inch square silver steel.
They have been hardened and tempered back to dark blue.
Something very simple but still needed to be made.
I also scrounged some galv iron water pipe which I will use to make a set of pullers to remove the hands of the clocks soon.