On Wednesday 08 July 2020 21:24:56 Jon Elson wrote:
> On 07/08/2020 08:03 PM, Gene Heskett wrote:
> > Absolutely Jon. But to do it right requires a machine with little or
> > no backlash so it can't pull the work.
>
> Or else, you always did a climb mill finish pass with a very
> shallow cut.
On 07/08/2020 08:03 PM, Gene Heskett wrote:
Absolutely Jon. But to do it right requires a machine with little or no
backlash so it can't pull the work.
Or else, you always did a climb mill finish pass with a very
shallow cut. That's what I did on my ancient Bridgeport
before I did the CNC
On Wednesday 08 July 2020 19:44:13 Jon Elson wrote:
> On 07/08/2020 04:01 PM, Gene Heskett wrote:
> > Its the next edge coming round to do another cut, which has to cut
> > thru the oxide that forms on the raw alu after the previous edge
> > clears the scene.
>
> And, that's why climb milling
On 07/08/2020 04:01 PM, Gene Heskett wrote:
Its the next edge coming round to do another cut, which has to cut thru
the oxide that forms on the raw alu after the previous edge clears the
scene.
And, that's why climb milling works so much better that
conventional milling. With conventional,
> wrote:
> > > No you would not have to do this in an inert atmosphere. The only
> > > difficult part would be collecting all the chips.
> >
> > I would expect that the newly-cut surface is hermetically sealed to
> > the cutting edge until it isn't, and then it isn't damaging the edge,
> > no
On Wednesday 08 July 2020 16:47:22 andy pugh wrote:
> On Wed, 8 Jul 2020 at 19:03, Todd Zuercher
wrote:
> > No you would not have to do this in an inert atmosphere. The only
> > difficult part would be collecting all the chips.
>
> I would expect that the newly-cut surface is hermetically
Machine Controller (EMC)
Subject: Re: [Emc-users] More cbn headaches
[EXTERNAL EMAIL] Be sure links are safe.
If you had a good scale, All you need to do is weight the stock. Then chuck it
is a lathe and make some long ribbon-like swarf until you have
what you think is enough.Then weigh
Again.It is not hard. We did stuff like this in school at UCLA. I
whole room full of 19 and 20 year olds did just fine.
It is even easier then I fist wrote. Just three steps.
1) Measure the weight of the bar stock using a scale that works in 0.0001
grams (tenths of mg)
2) Turn the bars
If you had a good scale, All you need to do is weight the stock. Then
chuck it is a lathe and make some long ribbon-like swarf until you have
what you think is enough.Then weigh the remaining stock. Assume the
difference is the amount of aluminum removed.Yes the surface area is
reduced
On Wednesday 08 July 2020 12:47:17 N wrote:
> On Wed, 8 Jul 2020 12:15:21 -0400
>
> Gene Heskett wrote:
> > On Monday 06 July 2020 00:43:30 Chris Albertson wrote:
> > > On Sun, Jul 5, 2020 at 3:33 AM andy pugh
wrote:
> > > > You say this a lot, but I have never heard anyone else say it.
> > >
On Wed, 8 Jul 2020 12:15:21 -0400
Gene Heskett wrote:
> On Monday 06 July 2020 00:43:30 Chris Albertson wrote:
>
> > On Sun, Jul 5, 2020 at 3:33 AM andy pugh wrote:
> > > You say this a lot, but I have never heard anyone else say it. What
> > > is your source?
> >
> > THis might be a
On Monday 06 July 2020 00:43:30 Chris Albertson wrote:
> On Sun, Jul 5, 2020 at 3:33 AM andy pugh wrote:
> > You say this a lot, but I have never heard anyone else say it. What
> > is your source?
>
> THis might be a "Chemistry 101" question. It should be easy enough to
> figure out except that
On Sun, Jul 5, 2020 at 3:33 AM andy pugh wrote:
>
> You say this a lot, but I have never heard anyone else say it. What is
> your source?
>
THis might be a "Chemistry 101" question. It should be easy enough to
figure out except that I last studied this stuff in the last 1970s
We all know that
On 07/05/2020 08:55 PM, Gregg Eshelman via Emc-users wrote:
That was my clue that I was never going to light a smith
wrench anywhere near mag.
If you've ever seen a magnesium engine or transmission case
burn, it is quite a show.
And, when the fire department doesn't have foam in their
truck,
There are ways to make magnesium very hard to burn. NeXT did it to the cases on
their computers. https://simson.net/ref/1993/cubefire.html
I assume that laptop computers with magnesium cases use similar alloys.
Mongoose BMX bicycles back in the 80's did a sneaky thing for their factory
team.
On Sunday 05 July 2020 06:30:13 andy pugh wrote:
> On Sun, 5 Jul 2020 at 07:05, Gene Heskett wrote:
> > quicker because alox is the 2nd hardest abrasive we have.
>
> No, that's CBN, second after diamond.
>
> > That, and if
> > cutting dry, the heat of oxidation of the chip coming off is 98% of
>
On Sun, 5 Jul 2020 at 07:05, Gene Heskett wrote:
> quicker because alox is the 2nd hardest abrasive we have.
No, that's CBN, second after diamond.
> That, and if
> cutting dry, the heat of oxidation of the chip coming off is 98% of the
> heat generated.
[citation needed]
You say this a lot,
On Saturday 04 July 2020 21:12:57 Jon Elson wrote:
> On 07/04/2020 04:26 PM, Gene Heskett wrote:
> > IIRC no sparks, 200 or so revs, could just barely hear it touching,
> > peeled two strips down to the alu about 1/4" wide. Not at all
> > impressed. Up to that point, I was watching a very thin
On 07/04/2020 04:26 PM, Gene Heskett wrote:
IIRC no sparks, 200 or so revs, could just barely hear it touching,
peeled two strips down to the alu about 1/4" wide. Not at all impressed.
Up to that point, I was watching a very thin cloud of steel dust
drifting away in the work light and figured
On 07/04/2020 04:23 PM, andy pugh wrote:
On Sat, 4 Jul 2020 at 22:08, Eric Keller wrote:
Steel bonds to diamond, and then you are cutting with steel.
My understanding of the problem was that it is due to carbon being
soluble in steel. And diamonds are just expensive carbon.
This is likely
On Saturday 04 July 2020 16:43:12 Jon Elson wrote:
> On 07/04/2020 12:54 PM, andy pugh wrote:
> > On Sat, 4 Jul 2020 at 18:02, Gene Heskett
wrote:
> >> Attacking HSS with diamond is a waste of time and burns up the
> >> expen$ive diamond.
> >
> > Whilst it is meant to be a terrible idea, in
On Sat, 4 Jul 2020 at 22:08, Eric Keller wrote:
> Steel bonds to diamond, and then you are cutting with steel.
My understanding of the problem was that it is due to carbon being
soluble in steel. And diamonds are just expensive carbon.
This is likely to be much more of a problem with
On Saturday 04 July 2020 16:15:53 andy pugh wrote:
> On Sat, 4 Jul 2020 at 20:59, Gene Heskett wrote:
> > > This sort of thing: https://www.ebay.com/itm/402313154494
> >
> > At that price I'd get 4, but there is a slim we may have snow by the
> > time they get here. Late August? Even a junk
On Sat, Jul 4, 2020 at 4:45 PM Jon Elson wrote:
> On 07/04/2020 12:54 PM, andy pugh wrote:
> > On Sat, 4 Jul 2020 at 18:02, Gene Heskett wrote:
> >
> >> Attacking HSS with diamond is a waste of time and burns up the expen$ive
> >> diamond.
> > Whilst it is meant to be a terrible idea, in
On 07/04/2020 12:54 PM, andy pugh wrote:
On Sat, 4 Jul 2020 at 18:02, Gene Heskett wrote:
Attacking HSS with diamond is a waste of time and burns up the expen$ive
diamond.
Whilst it is meant to be a terrible idea, in practice it works OK.
I think it depends on surface speed. If the speed is
On Sat, 4 Jul 2020 at 20:59, Gene Heskett wrote:
> > This sort of thing: https://www.ebay.com/itm/402313154494
>
> At that price I'd get 4, but there is a slim we may have snow by the time
> they get here. Late August? Even a junk moves faster than that.
What's the US version of Arc-Eurotrade?
On Saturday 04 July 2020 14:56:29 andy pugh wrote:
> On Sat, 4 Jul 2020 at 19:47, Gene Heskett wrote:
> > > Whilst it is meant to be a terrible idea, in practice it works OK.
> >
> > Not for me. Between the $20 dremel disks, and a $120 diamond plated
> > on one side, 5" in diameter that I peeled
On Saturday 04 July 2020 13:54:05 andy pugh wrote:
> On Sat, 4 Jul 2020 at 18:02, Gene Heskett wrote:
> > Attacking HSS with diamond is a waste of time and burns up the
> > expen$ive diamond.
>
> Whilst it is meant to be a terrible idea, in practice it works OK.
>
> > I have a 4" cup cbn wheel,
On Sat, 4 Jul 2020 at 19:47, Gene Heskett wrote:
> > Whilst it is meant to be a terrible idea, in practice it works OK.
>
> Not for me. Between the $20 dremel disks, and a $120 diamond plated on
> one side, 5" in diameter that I peeled the diamond off of,
The plated-on wheels don't work, but
On Saturday 04 July 2020 13:54:05 andy pugh wrote:
> On Sat, 4 Jul 2020 at 18:02, Gene Heskett wrote:
> > Attacking HSS with diamond is a waste of time and burns up the
> > expen$ive diamond.
>
> Whilst it is meant to be a terrible idea, in practice it works OK.
Not for me. Between the $20
On Sat, 4 Jul 2020 at 18:02, Gene Heskett wrote:
> Attacking HSS with diamond is a waste of time and burns up the expen$ive
> diamond.
Whilst it is meant to be a terrible idea, in practice it works OK.
> I have a 4" cup cbn wheel, but the arbors are junk, so its contact isn't
> true.
As bad
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