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Posted by Randy on January 12, 2009, 10:15 am
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I need to bevel one edge of an aluminum plate 15 degrees top and
bottom. I need a tool like a involute gear cutter, but with a
straight 15deg on both sides. Edge of the plate has a radius which
the angle needs to follow, so the plate must be laying flat bolted to
a subplate or fixture hanging off the edge. I'll use my VMC with the
cutter in a CAT40 stub arbor.
Can you buy these or do I need one custom made ? Easier to start with
an old gear cutter or a slitting saw?
1/2" thick plate, about 1/4" thick at the "point".
Thank You,
Randy
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Posted by BottleBob on January 12, 2009, 11:13 am
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Randy wrote:
> I need to bevel one edge of an aluminum plate 15 degrees top and
> bottom. I need a tool like a involute gear cutter, but with a
> straight 15deg on both sides. Edge of the plate has a radius which
> the angle needs to follow, so the plate must be laying flat bolted to
> a subplate or fixture hanging off the edge. I'll use my VMC with the
> cutter in a CAT40 stub arbor.
>
> Can you buy these or do I need one custom made ? Easier to start with
> an old gear cutter or a slitting saw?
Randy:
Double angle shank cutters might work if I'm understanding your
situation correctly. If the angles you want aren't in stock they could
probably make a custom one.
http://www.niagaracutter.com/hss/shank.html
http://tinyurl.com/989xqk
--
BottleBob
http://home.earthlink.net/~bottlbob
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Posted by Kirk Gordon on January 12, 2009, 2:08 pm
Please log in for more thread options BottleBob wrote:
>
>
> Randy wrote:
>
>> I need to bevel one edge of an aluminum plate 15 degrees top and
>> bottom. I need a tool like a involute gear cutter, but with a
>> straight 15deg on both sides. Edge of the plate has a radius which
>> the angle needs to follow, so the plate must be laying flat bolted
>> to a subplate or fixture hanging off the edge. I'll use my VMC
>> with the cutter in a CAT40 stub arbor.
>>
>> Can you buy these or do I need one custom made ? Easier to start
>> with an old gear cutter or a slitting saw?
>
>
> Randy:
>
> Double angle shank cutters might work if I'm understanding your
> situation correctly. If the angles you want aren't in stock they
> could probably make a custom one.
>
> http://www.niagaracutter.com/hss/shank.html
>
> http://tinyurl.com/989xqk
>
That would work; but it'll take two passes across the plate to get it
done. Back in the OLD days, when I remembered being young, we'd do this
with a pair of milling cutters arranged face-to-face on an arbor. Look at:
http://www.niagaracutter.com/millingcutters/mc.html
The FR and FL styles (you'll need one of each) ought to work, if you
can get them small enough to fit onto an arbor on a 40 taper machine,
and if the angles are available. I don't see any 15 degree models on
the NC website; but any fool with a cutter grinder could fix up a pair,
or make them from pretty much any old milling cutters you happen to have
lying around.
KG
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Posted by F. George McDuffee on January 12, 2009, 3:36 pm
Please log in for more thread options On Mon, 12 Jan 2009 14:08:48 -0500, Kirk Gordon
>BottleBob wrote:
> >
> >
> > Randy wrote:
> >
> >> I need to bevel one edge of an aluminum plate 15 degrees top and
> >> bottom. I need a tool like a involute gear cutter, but with a
> >> straight 15deg on both sides. Edge of the plate has a radius which
> >> the angle needs to follow, so the plate must be laying flat bolted
> >> to a subplate or fixture hanging off the edge. I'll use my VMC
> >> with the cutter in a CAT40 stub arbor.
> >>
> >> Can you buy these or do I need one custom made ? Easier to start
> >> with an old gear cutter or a slitting saw?
> >
> >
> > Randy:
> >
> > Double angle shank cutters might work if I'm understanding your
> > situation correctly. If the angles you want aren't in stock they
> > could probably make a custom one.
> >
> > http://www.niagaracutter.com/hss/shank.html
> >
> > http://tinyurl.com/989xqk
> >
>
>
> That would work; but it'll take two passes across the plate to get it
>done. Back in the OLD days, when I remembered being young, we'd do this
>with a pair of milling cutters arranged face-to-face on an arbor. Look at:
>
>http://www.niagaracutter.com/millingcutters/mc.html
>
> The FR and FL styles (you'll need one of each) ought to work, if you
>can get them small enough to fit onto an arbor on a 40 taper machine,
>and if the angles are available. I don't see any 15 degree models on
>the NC website; but any fool with a cutter grinder could fix up a pair,
>or make them from pretty much any old milling cutters you happen to have
>lying around.
>
>KG
===================
Which segues into a good question for our CNC gurus.
A double angle cutter needs to take two passes to cut both
bevels, while a v-type tool could get top and bottom in one pass.
Assuming that you could get both types of tools in an appropriate
diameter & appropriate holder, which one would you use.
With the double angle two pass, you have the ability to adjust
the amount of bevel by tool compensation and z height, and can
adjust each one separately. With a v-type tool, there is only
one pass, but you can adjust only the tool diameter compensation
to control bevel as z is fixed if both bevels are to be the
same, and adjusting one changes the other.
Unka' George [George McDuffee]
-------------------------------------------
He that will not apply new remedies,
must expect new evils:
for Time is the greatest innovator: and
if Time, of course, alter things to the worse,
and wisdom and counsel shall not alter them to the better,
what shall be the end?
Francis Bacon (1561-1626), English philosopher, essayist, statesman.
Essays, "Of Innovations" (1597-1625).
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Posted by Randy on January 12, 2009, 4:34 pm
Please log in for more thread options wrote:
>BottleBob wrote:
> >
> >
> > Randy wrote:
> >
> >> I need to bevel one edge of an aluminum plate 15 degrees top and
> >> bottom. I need a tool like a involute gear cutter, but with a
> >> straight 15deg on both sides. Edge of the plate has a radius which
> >> the angle needs to follow, so the plate must be laying flat bolted
> >> to a subplate or fixture hanging off the edge. I'll use my VMC
> >> with the cutter in a CAT40 stub arbor.
> >>
> >> Can you buy these or do I need one custom made ? Easier to start
> >> with an old gear cutter or a slitting saw?
> >
> >
> > Randy:
> >
> > Double angle shank cutters might work if I'm understanding your
> > situation correctly. If the angles you want aren't in stock they
> > could probably make a custom one.
> >
> > http://www.niagaracutter.com/hss/shank.html
> >
> > http://tinyurl.com/989xqk
> >
>
>
> That would work; but it'll take two passes across the plate to get it
>done. Back in the OLD days, when I remembered being young, we'd do this
>with a pair of milling cutters arranged face-to-face on an arbor. Look at:
>
>http://www.niagaracutter.com/millingcutters/mc.html
>
> The FR and FL styles (you'll need one of each) ought to work, if you
>can get them small enough to fit onto an arbor on a 40 taper machine,
>and if the angles are available. I don't see any 15 degree models on
>the NC website; but any fool with a cutter grinder could fix up a pair,
>or make them from pretty much any old milling cutters you happen to have
>lying around.
>
>KG
And again that would work If I could get 15 degree.
looks like I need to have one made. I'll have to talk to my tool
grinder guy. see what he says.
Thank You,
Randy
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> bottom. I need a tool like a involute gear cutter, but with a
> straight 15deg on both sides. Edge of the plate has a radius which
> the angle needs to follow, so the plate must be laying flat bolted to
> a subplate or fixture hanging off the edge. I'll use my VMC with the
> cutter in a CAT40 stub arbor.
>
> Can you buy these or do I need one custom made ? Easier to start with
> an old gear cutter or a slitting saw?