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Science Forum Index » Engineering - Joining (Welding) Forum » lots of holes in stainless pipe
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| Chris Henry |
 Posted: Fri Mar 28, 2008 11:08 pm |
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i have to cut @400 .875 holes in 1-1/2 schedule 10 s.s. pipe. most are
at 90 degrees on the centerline. some of the holes pass thru both sides,
others only one
i have at my disposal
milling machine
motivation to build a dedicated machine as this will be ongoing , then
can do the odd angles at the mill |
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| Gunner |
| Posted: Sat Mar 29, 2008 3:14 am |
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On Fri, 28 Mar 2008 23:08:04 -0500, Chris Henry
<williamhenry@bellsouth.net> wrote:
Quote: i have to cut @400 .875 holes in 1-1/2 schedule 10 s.s. pipe. most are
at 90 degrees on the centerline. some of the holes pass thru both sides,
others only one
i have at my disposal
milling machine
motivation to build a dedicated machine as this will be ongoing , then
can do the odd angles at the mill
Penetrator twist drills
http://www.oceanmachinery.com/drill-bits-coolant-hole-oil-drill-bits.htm
Insert endmill/drill in the mill
http://www.usshoptools.com/current_year/indexable_and_spade_drills/indeable%20drills.htm
You do have coolant, preferably through drill coolant, right?
Same distance between holes? A simple spring loaded plunger into the
last hole drilled on an adjustable holder works a treat for spacing.
Big question is..how long is the pipe? and whats the tolerance in
parallelism in total length?
Gunner |
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| Ernie Leimkuhler |
| Posted: Sat Mar 29, 2008 12:58 pm |
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In article <qgjHj.27473$rC6.15172@bignews4.bellsouth.net>,
Chris Henry <williamhenry@bellsouth.net> wrote:
Quote: i have to cut @400 .875 holes in 1-1/2 schedule 10 s.s. pipe. most are
at 90 degrees on the centerline. some of the holes pass thru both sides,
others only one
i have at my disposal
milling machine
motivation to build a dedicated machine as this will be ongoing , then
can do the odd angles at the mill
Sounds like an application for Hougen Rotabroaches.
<http://www.hougen.com/cutters/cutters_index.html> |
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| BillM |
| Posted: Sat Mar 29, 2008 2:12 pm |
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"Ernie Leimkuhler" <stagesmith@mindspring.com>
wrote in message
news:stagesmith-4D02EF.10585929032008@earthlink.vsrv-sjc.supernews.net...
+1 on that. Jancy is another brand. Do a
search for annular cutters, there may
be more sources out there.
Amazing cutters. I recently used a small mag
drill to drill around 150 holes
horizontally through the 1/2" thick web of some
standing I-beams. One
cutter did them all, little bit of cutting oil,
no sweat. Hardest part was climbing ladder
with mag drill on shoulder. |
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| Grant Erwin |
| Posted: Sun Mar 30, 2008 12:13 am |
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Ernie Leimkuhler wrote:
Quote: In article <qgjHj.27473$rC6.15172@bignews4.bellsouth.net>,
Chris Henry <williamhenry@bellsouth.net> wrote:
i have to cut @400 .875 holes in 1-1/2 schedule 10 s.s. pipe. most are
at 90 degrees on the centerline. some of the holes pass thru both sides,
others only one
i have at my disposal
milling machine
motivation to build a dedicated machine as this will be ongoing , then
can do the odd angles at the mill
Sounds like an application for Hougen Rotabroaches.
http://www.hougen.com/cutters/cutters_index.html
I have used rotabroaches on a mag drill, and on a milling machine. They
work enormously better on a mag drill, because all you have to do to
eject the slug is to retract the quill fully, whereas if you e.g.
use a 3/4" collet to hold one in a Bridgeport spindle, you will have
to stop the spindle each time and pry out the razor-sharp slug by hand.
And, sadly, the pipe would be much more easily workheld on the mill
table than the mag drill. But yes, rotabroaches would cut the material
well.
Grant |
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| BillM |
| Posted: Sun Mar 30, 2008 9:51 am |
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"Grant Erwin" <grant@NOSPAMkirkland.net> wrote
in message news:dkFHj.148$ta2.111@trndny05...
.. They
Quote: work enormously better on a mag drill, because
all you have to do to
eject the slug is to retract the quill fully,
whereas if you e.g.
use a 3/4" collet to hold one in a Bridgeport
spindle, you will have
to stop the spindle each time and pry out the
razor-sharp slug by hand.
Grant
Hmmm----didn't think of that. My use of them in
a mill has been limited to
square/rectangular tubing, and the slug usually
falls out. I wonder how difficult
it would be to set up a tubular drawbar with an
eject pin running through the middle?
Bill |
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| Chris Henry |
| Posted: Sun Mar 30, 2008 12:11 pm |
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I believe i am on the verge of building a custom mandrel and using a c
frame punch, the pipes are @ 10 feet and there are 42 .875 holes in each.
the shortcut for rotabroaching in the mill is to use the pin hole and
afeneder washer to bolt a spring ( i have a old soft die spring) to the
inside of the cutter
BillM wrote:
Quote: "Grant Erwin" <grant@NOSPAMkirkland.net> wrote
in message news:dkFHj.148$ta2.111@trndny05...
. They
work enormously better on a mag drill, because
all you have to do to
eject the slug is to retract the quill fully,
whereas if you e.g.
use a 3/4" collet to hold one in a Bridgeport
spindle, you will have
to stop the spindle each time and pry out the
razor-sharp slug by hand.
Grant
Hmmm----didn't think of that. My use of them in
a mill has been limited to
square/rectangular tubing, and the slug usually
falls out. I wonder how difficult
it would be to set up a tubular drawbar with an
eject pin running through the middle?
Bill
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| Grant Erwin |
| Posted: Sun Mar 30, 2008 2:52 pm |
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Chris Henry wrote:
Quote: the shortcut for rotabroaching in the mill is to use the pin hole and
a fender washer to bolt a spring (I have a old soft die spring) to the
inside of the cutter
How would this work? I can see running a 1/4-20" bolt through the pin hole
and into the bore of the spring ID, but surely you wouldn't have it go
all the way through the spring so what contacted the workpiece first would
be the bolt head, would you?
Grant Erwin |
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| Chris Henry |
| Posted: Sun Mar 30, 2008 8:43 pm |
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Grant Erwin wrote:
Quote: Chris Henry wrote:
the shortcut for rotabroaching in the mill is to use the pin hole and
a fender washer to bolt a spring (I have a old soft die spring) to the
inside of the cutter
How would this work? I can see running a 1/4-20" bolt through the pin hole
and into the bore of the spring ID, but surely you wouldn't have it go
all the way through the spring so what contacted the workpiece first would
be the bolt head, would you?
Grant Erwin
nope you use the fender washer and trap the first turn or so, depending
on the spring. ( the turns closest to the top of the cutter. but you
could do it your way as well. you just need a little bit of pressure to
eject the slug. |
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| Bruce in Bangkok |
| Posted: Mon Mar 31, 2008 12:49 am |
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On Sun, 30 Mar 2008 12:11:35 -0500, Chris Henry
<williamhenry@bellsouth.net> wrote:
Quote: I believe i am on the verge of building a custom mandrel and using a c
frame punch, the pipes are @ 10 feet and there are 42 .875 holes in each.
the shortcut for rotabroaching in the mill is to use the pin hole and
afeneder washer to bolt a spring ( i have a old soft die spring) to the
inside of the cutter
42.875 holes - be kind of interesting to watch you drill that last
part of a hole :-)
Bruce-in-Bangkok
(correct email address for reply) |
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