Dave,
Are we talking about the same fixture? David Frantz and I were describing a cup with a hole in the middle that screws onto a threaded rod chucked in the lathe. In the past I have used split nuts to hold threaded stock so maybe that is what you are talking about.
Anyway, I have only tested out my tool holding #6 and #8 screws while I grind them. Don't know how well it would hold up on the lathe.
Rick
-----Original Message-----
From: gingery_machines@yahoogroups.com [mailto:gingery_machines@yahoogroups.com] On Behalf Of David Patterson
Sent: Monday, February 28, 2011 4:51 PM
To: gingery_machines@yahoogroups.com
Subject: RE: [gingery_machines] new article available: A Different Kind of Screw Vise
So now we're about back to what I said. just double nut the screw and stick it in the lathe, no special tool required. ;-)
Dave Patterson
odd_kins@yahoo.com
http://home.comcast.net/~oddkins/foundry_home.html
--- On Mon, 2/28/11, Rick Sparber <rgsparber@aol.com> wrote:
From: Rick Sparber <rgsparber@aol.com>
Subject: RE: [gingery_machines] new article available: A Different Kind of Screw Vise
To: gingery_machines@yahoogroups.com
Date: Monday, February 28, 2011, 7:13 AM
David,
"A little back and forth" = "All of us are smarter than any one of us"!
It certainly would be easy to adapt this idea to a lathe or drill press.
Rick
-----Original Message-----
From: gingery_machines@yahoogroups.com
[mailto:gingery_machines@yahoogroups.com] On Behalf Of David Frantz
Sent: Monday, February 28, 2011 8:09 AM
To: gingery_machines@yahoogroups.com
Cc: gingery_machines@yahoogroups.com
Subject: Re: [gingery_machines] new article available: A Different Kind of
Screw Vise
Excellent idea!!! Getting rid of the slot entirely makes a lot of sense
for small screws. A little back and forth does a lot of good especially
when it comes to simplifying something.
Now that I've said that if one replaced the bolt with a precise shaft or
arbor then the same vise could be used in a lathe. Or for that matter in a
drill press with a file.
David A Frantz
websterindustro4at4mac.com
Sent from my iPhone.
On Feb 28, 2011, at 8:02 AM, Rick Sparber <rgsparber@aol.com> wrote:
> David,
>
> Given how difficult it is to hold a very small screw, maybe the user will
> put up with a bit more hassle with the vise such that we can side step all
> slots. The basic idea is a tiny cup with a hole in the bottom.
>
> Take some 3/8" diameter rod, cut off 1/2",
> face and set the overall length to 0.500",
> drill in 0.450" with a F drill to leave a minimum floor thickness of
0.050".
>
> Then drill through with the clearance drill for, say a 2-56 screw.
> Tap the larger diameter 1/4-20.
>
> The tiny screw would then be dropped down the hole, maybe needing tweezers
> to get it to point down through the clearance hole. The cone divot left
from
> the F drill's tip would help guide the screw. If the screw is steel, a
> magnet under the tiny hole might help assuming the vise is made of
aluminum.
>
> With the screw in place, use a 1/4-20 threaded rod to lock it down and be
> the handle.
>
> I'm not ready to "abandon" my newbie friends.
>
> Rick
>
> -----Original Message-----
> From: gingery_machines@yahoogroups.com
> [mailto:gingery_machines@yahoogroups.com] On Behalf Of David Frantz
> Sent: Monday, February 28, 2011 2:08 AM
> To: gingery_machines@yahoogroups.com
> Cc: gingery_machines@yahoogroups.com
> Subject: Re: [gingery_machines] new article available: A Different Kind of
> Screw Vise
>
> You could try a slight redesign. Here you might try to bore the vise in
a
> lathe with a flat seat where the head of the bolt would sit. That way
you
> could use any end mill to cut the slot for the head. The key here is
that
> the slot is cut above the seat for the head. The slot for the screw
shaft
> is a little more difficult and needs to be sawn in some manner. Once
you
> have a couple and the corresponding arbor, slitting saws can come in very
> handy.
>
> You probably could mill the slots but that requires a very tiny mill in a
> relatively deep slot. Of course resizing the vice body would help here.
> Another possibility is to use this as an excuse to make an EDM machine.
> The problem then is that these vices are no longer beginners projects.
If
> you are bull headed enough you could even use a thin file to cut your slot
> German milling machine style.
>
> David A Frantz
> websterindustro4at4mac.com
>
>
>
>
> ------------------------------------
>
>
>
>
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