Screwhead chuck

Hi,
I have always been attracted by the lantern chucks I have seen posted here at HMT, and have planned to make one, one day ...
But as I was recently shopping at the local hardware store, suddenly the light came. I saw a kind of big hose brass fitting like this one :

http://www.labellenote.fr/file/homem...chuck_0000.jpg

I thought that I could do something quick with that, just adding a brass cap nut and a core screw in order to hold any hex screw driver tip to lock the screw against the cap.

Here are the main parts :
- on the left, I machined and tapped a sleeve that will be "loctited" inside the brass.
- the M10 screw will have to get an hex female hole at the end to receive an hex bit like the one above on the picture.
- The brass body has its main part turned down to make the shaft
- The cap was surfaced true, on both sides, and a 8 mm hole is center drilled.

http://www.labellenote.fr/file/homem...chuck_0001.jpg

And here the collection of bushings in order to fit any screw diameter : 2, 2.5, 3, 3.5, 4, 4.5, 5, 6
they are lightly counter sunk in order to fit either flat or counter sunk headed screws
The screw head has been (badly) knurled and the hex tip has been made.
That's actually the most difficult part of the job. I drilled a hole smaller that the hex diagonal and then pressed an hex tip in it.
I removed it and tried to file the inside with small files and a dremel in order to get a slip fit.
I had to use a dye to readjust the somewhat expended threads as well.

http://www.labellenote.fr/file/homem...chuck_0002.jpg

And here is the assembly and mounted on the lathe.

http://www.labellenote.fr/file/homem...chuck_0003.jpg

http://www.labellenote.fr/file/homem...chuck_0004.jpg

Christophe,

I like your adaptation of the hose brass fitting. Thank you for all the details for making the screw chuck.

Regards,
Paul

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Thanks Christophe Mineau! We've added your Screwhead Chuck to our Workholding category,
as well as to your builder page: Christophe Mineau's Homemade Tools. Your receipt:

<div id="blocks"> <div class="block b1 pngfix"> <div class="bimg"> <div> <a href="http://www.homemadetools.net/homemade-screwhead-chuck"> <img src="/uploads/213452/homemade-screwhead-chuck.jpeg"/> </a> </div> </div> <div class="head pngfix"></div> <div class="left pngfix"></div> <div class="right pngfix"></div> <div class="blockover b1 pngfix"> <div class="title"> <a href="http://www.homemadetools.net/homemade-screwhead-chuck">Screwhead Chuck</a> <span> by <a href="http://www.homemadetools.net/builder/Christophe+Mineau">Christophe Mineau</a></span> </div> <div class="tags">tags: <a href='http://www.homemadetools.net/tag/chuck'>chuck</a> </div> </div> </div> </div>
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Nice, Thanks!!

Ralph

Some other thoughts re the threaded rod with the hex hole...

Buy a cheap screwdriver already fitted with a hex socket and retaining magnet.

Cut off the end and thread and attach knurled thumb knob.

or

Turn down rod and loctite into a hole drilled into an appropriate sized bolt

Thanks Ralph and Marv, good point, if I had to redo, I would try that.

Christophe,
Nicely done. I especially like the utilization of as many off the shelf items as possible.
Like you said there are many different approaches to lantern chucks and this one can
be added to the mix. Thanks for sharing.

I very much enjoy it when things are repurposed to ones special needs.
You did a good job.
Thanks for posting.

Quote:

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Originally Posted by mklotz

Some other thoughts re the threaded rod with the hex hole...

Buy a cheap screwdriver already fitted with a hex socket and retaining magnet.

Cut off the end and thread and attach knurled thumb knob.

or

Turn down rod and loctite into a hole drilled into an appropriate sized bolt

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or use a 5/16" SHCS since the socket on that is 1/4" hex - that's what I did with my lantern chuck.

Christophe,
the hex screwdriver tip within the chuck is a valuable feature. That's better than friction. I will make a new chuck.
I bought 10 1/4" caps.
Then reduced the (future) mandrel to a ø of 12.5 mm
Then cut the 1/4" thread not to the theoretical depth but to a 'playless' fit with the caps (luckily all were of the same size)
I assume (against an engineering law) that the playless fit will center the caps to the mandrel.
The outer face of the caps were true to the mandrel, so I just drilled the necessary diameters: 1.4, 1.6, 2.0, 2.5

Quote:

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Originally Posted by desbromilow

or use a 5/16" SHCS since the socket on that is 1/4" hex - that's what I did with my lantern chuck.

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That is a GREAT stealable idea! Consider it stolen! With thanks!

Bill

Using SHCS as impromptu socket wrenches is a useful trick in other areas. I make wrenches for the 2-56 hex head screws so common in model steam engines.

This chart...

Socket Head Cap Screw Size Chart

will allow folks to see what sizes are available.

Yes, that would be great, but sadly, in my metric world, for once, it would not help...

Marv: First, Thank you for one of the best SHCS charts I have seen. It is especially useful in this age of CAM because all the dims are there for generating the correct counterbore as well as the usual clearance dims. Second, I'm trying to print it out to laminate it into a survivable reference. Of course its HTML and thus a mess to print cleanly. So I went here to try and find the source of your chart. After drilling around for more than a 1/2 hr I still can't find where they have hidden the chart. BTW, thanks for the pointer to CSG . . . another wonderful reference. So, any hints on how I can edit the chart for a nice printout? I also googled "how to edit HTML" and got the usual page of outdated, useless references. Help, please! :-)

Quote:

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Originally Posted by Christophe Mineau

Yes, that would be great, but sadly, in my metric world, for once, it would not help...

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The 2nd page of the chart is everything metric! Not sure what you are looking for.

Quote:

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Originally Posted by Saltfever

Marv: First, Thank you for one of the best SHCS charts I have seen. It is especially useful in this age of CAM because all the dims are there for generating the correct counterbore as well as the usual clearance dims. Second, I'm trying to print it out to laminate it into a survivable reference. Of course its HTML and thus a mess to print cleanly. So I went here to try and find the source of your chart. After drilling around for more than a 1/2 hr I still can't find where they have hidden the chart. BTW, thanks for the pointer to CSG . . . another wonderful reference. So, any hints on how I can edit the chart for a nice printout? I also googled "how to edit HTML" and got the usual page of outdated, useless references. Help, please! :-)

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Using Firefox, I was able to take a screenshot and download it. It ends up being a ~420 kb PNG file. No messing with HTML required.

Give that a try for yourself. If it doesn't pan out, PM me your email address and I'll send you an email with the downloaded PNG attached.

Thanks for the suggestion, Marv. I tried a few screenshots but never could get it as crisp as printed text. I finally dumped the data into a Word table and fooled around with it far too long but ended up with something acceptable.

hmm...so , chuck from hardware is safe and ok....dang I was worried for a moment. yes making stuff like this is easy and simple.and you may need to make any number of things. stuff like this is especialy good when you have a lathe that insant quite on center and need something small that is . make the chuck dont take it out out on what you need to make. it should be on center...should be..