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Posted by Existential Angst on January 4, 2010, 2:53 pm
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Awl --
Luckily, I found a set of jaws I had made, for milling multiple 5/8'ish
round rods on their ends -- facing, tapped holes, etc.
These jaws are not so easy to make, so I'm glad I found them, but it dawned
on me how closely they resembled the rack part of a rack and pinion gear.
If the rack could be fastened to a vise jaw, wouldn't it make a fantastic
fixture for multiple small rounds?
The moveable jaw uses wood or something compressible to apply reasonably
uniform pressure to all the pieces. The jaws ( for 6" Kurt, but about 8"
wide) I have can hold about a dozen rounds. A rack could hold many more
smaller pieces.
Proly more useful for the cnc-lathe-less peeple.
I do many "lathe-ish" operations on a vmc, if I have the psychological
wherewithall to make the fixture. In some cases, the right set up might
rival a low-end cnc-lathe ito parts rate, but always at the price of a
significant set up.
--
EA, wondering how many "racks" I've inadvertantly thrown out.....
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Posted by Half-nutz on January 4, 2010, 3:46 pm
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wrote:
> Awl --
>
> Luckily, I found a set of jaws I had made, for milling multiple 5/8'ish
> round rods on their ends -- facing, tapped holes, etc.
>
> These jaws are not so easy to make, so I'm glad I found them, but it dawn=
ed
> on me how closely they resembled the rack part of a rack and pinion gear.
> If the rack could be fastened to a vise jaw, wouldn't it make a fantastic
> fixture for multiple small rounds?
>
> The moveable jaw uses wood or something compressible to apply reasonably
> uniform pressure to all the pieces. =A0The jaws ( for 6" Kurt, but about =
8"
> wide) I have can hold about a dozen rounds. =A0A rack could hold many mor=
e
> smaller pieces.
>
> Proly more useful for the cnc-lathe-less peeple.
> I do many "lathe-ish" operations on a vmc, if I have the psychological
> wherewithall to make the fixture. =A0In some cases, the right set up migh=
t
> rival a low-end cnc-lathe ito parts rate, but always at the price of a
> significant set up.
>
> --
> EA, wondering how many "racks" I've inadvertantly thrown out.....
For those small parts, I've used a block that was bored and brass
tipped set screws to hold the parts.
Relying on the wood for consistant "crush" and thus the grip might be
iffy after a few hundred pieces.
I used 1/4-28 set screws for 1/4" SS pins I was making, they had some
pretty aggressive cuts on them, so the fixture held up very well.
Especially since the milling cuts were offset, and trying to spin the
parts out of the fixture.
But we've gone over this subject before for these exact parts of
yours.
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Posted by Existential Angst on January 4, 2010, 3:51 pm
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wrote:
> Awl --
>
> Luckily, I found a set of jaws I had made, for milling multiple 5/8'ish
> round rods on their ends -- facing, tapped holes, etc.
>
> These jaws are not so easy to make, so I'm glad I found them, but it
> dawned
> on me how closely they resembled the rack part of a rack and pinion gear.
> If the rack could be fastened to a vise jaw, wouldn't it make a fantastic
> fixture for multiple small rounds?
>
> The moveable jaw uses wood or something compressible to apply reasonably
> uniform pressure to all the pieces. The jaws ( for 6" Kurt, but about 8"
> wide) I have can hold about a dozen rounds. A rack could hold many more
> smaller pieces.
>
> Proly more useful for the cnc-lathe-less peeple.
> I do many "lathe-ish" operations on a vmc, if I have the psychological
> wherewithall to make the fixture. In some cases, the right set up might
> rival a low-end cnc-lathe ito parts rate, but always at the price of a
> significant set up.
>
> --
> EA, wondering how many "racks" I've inadvertantly thrown out.....
For those small parts, I've used a block that was bored and brass
tipped set screws to hold the parts.
Relying on the wood for consistant "crush" and thus the grip might be
iffy after a few hundred pieces.
==================================
True. You gotta replace the wood after a while.
I used 1/4-28 set screws for 1/4" SS pins I was making, they had some
pretty aggressive cuts on them, so the fixture held up very well.
Especially since the milling cuts were offset, and trying to spin the
parts out of the fixture.
=================================
Yeah, these multiple part-ditties are not for heavy milling.
But we've gone over this subject before for these exact parts of
yours.
===================================
Yup.... STILL struggling, but not as hard.
I'll be keeping my eyes peeled for discarded rack/pinions, tho.
Not absolutely sure the idea would prove entirely practical, since I haven't
actually tried it, but I'm pretty sure it would work for at least a few rod
sizes.
--
EA
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Posted by Cliff on January 6, 2010, 10:11 am
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On Mon, 4 Jan 2010 15:51:01 -0500, "Existential Angst"
>True. You gotta replace the wood after a while.
Plastics. High-durometer elastomers or rubber.
But watch out for the forces. And the accuracy.
Light duty.
--
Cliff
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Posted by on January 4, 2010, 6:31 pm
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wrote:
> Awl --
>
> Luckily, I found a set of jaws I had made, for milling multiple 5/8'ish
> round rods on their ends -- facing, tapped holes, etc.
>
> These jaws are not so easy to make, so I'm glad I found them, but it dawn=
ed
> on me how closely they resembled the rack part of a rack and pinion gear.
> If the rack could be fastened to a vise jaw, wouldn't it make a fantastic
> fixture for multiple small rounds?
>
> The moveable jaw uses wood or something compressible to apply reasonably
> uniform pressure to all the pieces. =A0The jaws ( for 6" Kurt, but about =
8"
> wide) I have can hold about a dozen rounds. =A0A rack could hold many mor=
e
> smaller pieces.
>
> Proly more useful for the cnc-lathe-less peeple.
> I do many "lathe-ish" operations on a vmc, if I have the psychological
> wherewithall to make the fixture. =A0In some cases, the right set up migh=
t
> rival a low-end cnc-lathe ito parts rate, but always at the price of a
> significant set up.
>
> --
> EA, wondering how many "racks" I've inadvertantly thrown out.....
A fairly stiff urethane block might substitute for your wood with a
longer life. I've got a set of "soft" vise jaws for holding gun parts
that barely show lines after holding threaded parts. Lots of racks on
the surplus market, fewer mating gears, though that's not important to
you.
Stan
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>
> Luckily, I found a set of jaws I had made, for milling multiple 5/8'ish
> round rods on their ends -- facing, tapped holes, etc.
>
> These jaws are not so easy to make, so I'm glad I found them, but it dawn=