Hello Marty,
you helped yourself, ok. One remark on this book: I have the impression
that the author knows what he is writing about. He sems to know more than
he can put into the book. That makes it worth to continue thinking his way.
Only handicap for me: imperial units everywhere, no
Hello Gentlemen,
I followed this discussion until it turned, at times, kinda silly. Is
doens't make sense arguing rationally against grown habits and prejudices.
And why shouldn't craftsmen continue doing their job the way tjey learned
it long ago? But: If we are going to be a round-the-world
Sorry, the book mentioned was written by Michael Porter.
Peter Blodow
--
Crystal Reports - New Free Runtime and 30 Day Trial
Check out the new simplified licensing option that enables unlimited
royalty-free distribution
Never mind, Google is indeed my friend.
Gas Burners for Forges, Furnaces, and Kilns
Skipjack Press, Inc. (February 2004)
ISBN-10: 1879535203
ISBN-13: 978-1879535206
- Marty
--
Crystal Reports - New Free Runtime and 30
Peter - Can you please share the title and publisher of this book? Thanks!
- Marty Swartz
--
Opportunity is missed by most people because it is dressed in overalls and
looks like work. -Thomas A. Edison
On Sat, Jun 13, 2009 at 9:08 AM, Peter blodow p.blo...@dreki.de wrote:
Sorry, the book
If you are planning on building a gas fired forge, you should look at:
Recuperative Gas Fired Forge Furnace, by Robb Gunter, et al.
(Published by: ABANA).
Ken
Marty Swartz wrote:
Never mind, Google is indeed my friend.
Gas Burners for Forges, Furnaces, and Kilns
Skipjack Press, Inc.
On Sat, 2009-06-13 at 09:42 -0400, Marty Swartz wrote:
Never mind, Google is indeed my friend.
Gas Burners for Forges, Furnaces, and Kilns
Skipjack Press, Inc. (February 2004)
ISBN-10: 1879535203
ISBN-13: 978-1879535206
- Marty
Please let me know how your project goes. I made a burner
On Sat, 2009-06-13 at 14:51 +0200, Peter blodow wrote:
... snip
One more technical aspect of the problem wasn't mentioned so far: giving a
measure in meters, cm or mm etc. also tells something about the tolerances
involved. For instance, 1.2 m means: more than 1.1 m, but not over 1.3 m, a
2009/6/12 Steve Blackmore st...@pilotltd.net
Nahh - it's only inches G But, as it's mainly cutting ply, laminate
and the odd Al sheet it's plenty good enough.
2 x 30mm wide belt, very high tension. A word of warning - The belt
tension is often more than the rest of the bearings/mounts can
On Wed, 10 Jun 2009 18:06:57 -0400, you wrote:
Any case a flex of .02 would be unacceptable for us. We do not see
that kind of flex. It's really around 0.005 .
The belts are european steel cable loaded AT5 belts 3/4 wide and
driven on AL pulley's.
Ooohh look! - somebody with experience
Ooohh look! - somebody with experience who's actually been there and
done it too G
Hahahaha
I've give up arguing with pedantic theorists, they always know better,
I'll just get back to doing it too at about +/-0.001 ;)
Wow Steve... that's impressive.
We thought about a way to get rid of
2009/6/11 Rainer Schmidt lemonn...@gmail.com:
I've give up arguing with pedantic theorists, they always know better,
I'll just get back to doing it too at about +/-0.001 ;)
Wow Steve... that's impressive.
He might mean inches, it isn't clear.
I did once have the job of machining glass to
I did once have the job of machining glass to 0.0001mm but that was
done with an Ion Mill so doesn't really count.
I default into Inches However, I am a metric guy who is constantly
annoyed by the US imperial system.
fractions of inches, 12 per foot, three per yard and 95% of the
population
And even fewer know that rods and chains are legal units of measure either.
It would be interesting to know the real reasons for the various units of
measure
as a historical tidbit. Much of that information seems to be lost to the
general population.
I grew up with imperial measures, but as
Steve Blackmore wrote:
On Wed, 10 Jun 2009 18:06:57 -0400, you wrote:
Any case a flex of .02 would be unacceptable for us. We do not see
that kind of flex. It's really around 0.005 .
The belts are european steel cable loaded AT5 belts 3/4 wide and
driven on AL pulley's.
On Jun 11, 2009, at 7:06 AM, Jack Coats wrote:
And even fewer know that rods and chains are legal units of measure
either.
Yep. 4 rods/chain, 10 chains/furlong 8 furlongs/mi.
so many paces/chain obscure unless you were chasing fires for
the USFS
during the 50's.
It would be
On Thu, 2009-06-11 at 10:22 -0400, Douglas Pollard wrote:
... snip
I try my best to say what I think about a subject and then when someone
disagrees or gives a reason it won't work, to just keep my mouth shut.
After all I have said what I think why elaborate on it? It's hard
though. I
2009/6/11 Rainer Schmidt lemonn...@gmail.com:
I did once have the job of machining glass to 0.0001mm but that was
done with an Ion Mill so doesn't really count.
.0001mm... can't imagine how steady you have to temper everything
around that thing... How do you position that? Piezo?
It
I stopped 'translating' values early on once I moved to the states.
It's just confusing. it's easier to get used to the 'new' system.
But metric is definitely forcing it's way into the door. There are
numerous catalgues I recevied recently which have only metric torque
values and no US imperial
Rainer Schmidt wrote:
I did once have the job of machining glass to 0.0001mm but that was
done with an Ion Mill so doesn't really count.
I default into Inches However, I am a metric guy who is constantly
annoyed by the US imperial system.
fractions of inches, 12 per foot, three per
I believe that the proposed silicon sphere Avagadro/kg standard is
95mm +/- 30nm, which is a truly impressive bit of manufacturing.
http://www.acpo.csiro.au/spheres.htm
Owww I LOVE shiny stuff.. that sphere looks marvelous. I could
not take my hand of it all day 8).
And yes, that is
Rainer Schmidt wrote:
I believe that the proposed silicon sphere Avagadro/kg standard is
95mm +/- 30nm, which is a truly impressive bit of manufacturing.
http://www.acpo.csiro.au/spheres.htm
Owww I LOVE shiny stuff.. that sphere looks marvelous. I could
not take my hand of it
2009/6/11 Douglas Pollard dougp...@verizon.net:
We did some experiments and what we decided was
that fingers must be the most accurate thing on earth. It some point
the writing gets pretty feeble looking but is still ledgeable. One of
the engineers did a write up on this off the wall
On Thu, 11 Jun 2009 07:25:33 -0400, you wrote:
Ooohh look! - somebody with experience who's actually been there and
done it too G
Hahahaha
I've give up arguing with pedantic theorists, they always know better,
I'll just get back to doing it too at about +/-0.001 ;)
Wow Steve... that's
One way to get good results with belts is to strobe them at full speed
and watch the first tooth engaged by the pulley. If the tooth is trying
to climb out, it's too slack. That fault often shows after a time as a
line of wear on the pulley teeth near the crest, but it's a bit late
then.
On Tue, 9 Jun 2009 22:25:02 +0100, you wrote:
2009/6/9 Steve Blackmore st...@pilotltd.net:
Andy - timing belts are not bungees ;)
Yes they are, everything is.
If you really want the math read something like
I have a PhD in materials science. Your move :-)
What a childish response - is your
On Tue, 9 Jun 2009 22:25:02 +0100, Andy Pugh wrote:
2009/6/9 Steve Blackmore st...@pilotltd.net wrote:
Andy - timing belts are not bungees ;)
Yes they are, everything is.
I have a PhD in materials science. Your move :-)
The PhD is right - everything stretches. Every material has a
2009/6/10 Steve Blackmore st...@pilotltd.net:
What a childish response - is your dad bigger than mine too??
No, he is a tiny little chap, he would hardly stretch a timing belt at all.
In practical terms there is no stretch, provided the design criteria is
not exceeded.
Let us back up a bit
I'm a chemical engineer and dissolve all my problems!
Besides that we designed a timing belt driven CNC machine and operate
it happily.
We use a belt on each side of the long axis and that is about 27 ft.
belt length.
The steel loaded urethane belts are tensioned and sound like a base string.
On Mon, 08 Jun 2009 16:25:32 -0400, you wrote:
What belt stretch? Once they are adjusted up, that's it.
When using a belt to transfer rotary motion from one pulley to another,
belt stretch is usually negligible. That is very much NOT the case when
using a toothed belt to convert rotary
On Tue, 9 Jun 2009 00:12:05 +0100, you wrote:
2009/6/8 Ian Wright watchm...@fastmail.fm:
Interesting maths but what would the effect of changing
temperature be - which would be the more stable, he belt or
the ballscrew?
I would guess they would be about the same, but the elasticity of the
2009/6/9 Steve Blackmore st...@pilotltd.net:
Andy - timing belts are not bungees ;)
Yes they are, everything is.
If you really want the math read something like
I have a PhD in materials science. Your move :-)
--
atp
Everything is a bungee. Yep you are right. All things are relative,
depends
on the application. Is it 'enough' to matter? Depends on your application.
I agree that as we approach the limits, the limits are more critical.
Most of us are just trying to 'get-er-done', so working within
2009/6/10 Jack Coats j...@coats.org:
Most of us are just trying to 'get-er-done', so working within 'practical
tollerances'
for 'practical solutions', is probably the most helpful.
Absolutely, I posted a rather longer message on pretty much that subject.
--
atp
Andy Pugh wrote:
2009/6/10 Jack Coats j...@coats.org:
Most of us are just trying to 'get-er-done', so working within 'practical
tollerances'
for 'practical solutions', is probably the most helpful.
Absolutely, I posted a rather longer message on pretty much that subject.
If
On Sat, Jun 06, 2009 at 08:44:57AM -0400, John Kasunich wrote:
My shoptask (cheap chinese lathe-mill-drill) had horrible backlash in
the rack and pinion quill drive. There was lash in the rack-pinion
itself, lash in the dog clutch that connected the pinion to a worm gear
(disengaged for
On Sat, Jun 06, 2009 at 12:10:42PM -0500, Jon Elson wrote:
It may be possible to adapt something to the side of the quill, but my
experience with a ballscrew drive that attaches to the quill nose
showed it was a poor solution. if you made it insanely rigid, it MIGHT
work OK, the one I saw
2009/6/8 Erik Christiansen dva...@internode.on.net:
While I only have 0.008 to deal with, a possible fix presented itself
on an old motor assembly from the junkbox. It has a split pinion, which
drives a wide nylon gear. The two pinion halves seem to be slightly out
of phase, thus loading the
2009/6/8 Kirk Wallace kwall...@wallacecompany.com:
I need to figure out how to make one of these:
http://urobotics.urology.jhu.edu/projects/BW/
Cute, but either the geometry won't work, or you need a very clever
relationship between the pitch and depth of the worm thread. Not
impossible with a
2009/6/8 Ian Wright watchm...@fastmail.fm:
Interesting maths but what would the effect of changing
temperature be - which would be the more stable, he belt or
the ballscrew?
I would guess they would be about the same, but the elasticity of the
belt might vary more with temperature.
Ian W.
2009/6/9 Frank Tkalcevic fr...@franksworkshop.com.au:
How much backlash would the rubber teeth on the belt contribute?
Some I guess. Though it might matter less than you think. In fact,
that thought has been occurring to me throughout this thread. There
has been a lot of concern over absolute
Andy Pugh wrote:
2009/6/9 Frank Tkalcevic fr...@franksworkshop.com.au:
How much backlash would the rubber teeth on the belt contribute?
Some I guess. Though it might matter less than you think. In fact,
that thought has been occurring to me throughout this thread. There
has been a
Gentlemen,
I believe there will be the same amount of cutting forces generated
during climb milling and conventional milling. I believe the climb
milling cutting forces are proportionately more on the holding axis. I
have seen the Y axis overheat during an X axis move. The Y axis must
On Sat, 2009-06-06 at 23:48 -0500, Jon Elson wrote:
... snip
You pretty much need to have a big tombstone fixture around all the
time. Any small parts, vise, etc. are mounted to the back of the
tombstone. Visibility and access to the workpiece are a pain.
Sounds like there could be a down
2009/6/7 Kirk Wallace kwall...@wallacecompany.com:
On Sat, 2009-06-06 at 23:48 -0500, Jon Elson wrote:
... snip
You pretty much need to have a big tombstone fixture around all the
time. Any small parts, vise, etc. are mounted to the back of the
tombstone. Visibility and access to the
Kirk Wallace wrote:
I forgot about the brake, but if the knee is counter balanced, it may
not be needed.
Good point.
and an encoder in there, and it would be a ROYAL pain to work on this
stuff inside the knee!
But once it's set up, I'll never need to work on it ever again :)
On Jun 7, 2009, at 11:22 AM, Jon Elson wrote:
snip?
Hmmm, that makes a LOT of sense. You'd need an anti-backlash worm
drive
with an integral
thrust bearing, but they actually make such stuff. Likely expensive,
though.
Good, Fast, Cheap pick any two.
Dave
Jon
Erik Christiansen wrote:
There's then room to fit a vertical ballscrew, clamped externally
to the quill nose.
No, I would not do that. It will be very hard to make this rigid. A
friend has a benchtop mill with that rig, and it is very flexible.
That's why I did it from the stop ring bolt
2009/6/6 Erik Christiansen dva...@internode.on.net:
Or, if those ballscrews do wear out overnight unless aligned with
super-duper accuracy,
Combining two threads on this issue:
I suspect that as long as there is some give in the mounting
arrangement before you tighten it all up then the
Erik Christiansen wrote:
Hmmm, my quill lacks a stop ring. There's just the last 2 length
widening from 3.5 to 3.75, then the INT30 socket and dogs below that.
Ahh, somehow I was under the impression this was a Bridgeport or clone,
but quite a
different machine. It may be possible to adapt
On Sat, 2009-06-06 at 12:10 -0500, Jon Elson wrote:
Especially since this machine also has a horizontal spindle, it may make
a lot more sense to make
the knee the driven axis (Z for vertical, Y for horiz. spindle).
Jon
I have been thinking about that for my Bridgeport. I could replace
Kirk Wallace wrote:
I have been thinking about that for my Bridgeport. I could replace the
ram with a horizontal spindle. I like that the chips clear the work
piece better. Or the spindle could be hung off the ram's accessory
mount, so that the spindle axis is parallel to X axis.
I am a
On Fri, 2009-06-05 at 15:32 +1000, Erik Christiansen wrote:
On Thu, Jun 04, 2009 at 09:42:21AM -0700, Dave Engvall wrote:
It may be possible to get more bang for your buck by purchasing a
better ball screw ( ebay or HIWin).
Thank you for that. I'm not sure that I'd trust ebay on duch
Erik Christiansen wrote:
Ah, it's off with the quill feed pinion, capstan, and fine feed worm
then, unless milling the 3 bolt holes to slots will allow the pinion to
slip into pefect mesh with the rack on the quill.
That will only move one side of the pinion, leaving it crooked. Anyway,
The mill-drill which I'm starting to convert to CNC has 0.2mm (0.008)
backlash in the Z feed, making it a much better candidate for stepper
control than servo, IIUC. There is though, sufficient in-built upward
spring-loading for the quill to retract if the feed worm is disengaged.
I wonder if that
On Thu, 2009-06-04 at 23:04 +1000, Erik Christiansen wrote:
The mill-drill which I'm starting to convert to CNC has 0.2mm (0.008)
backlash in the Z feed, making it a much better candidate for stepper
control than servo, IIUC. There is though, sufficient in-built upward
spring-loading for the
On Jun 4, 2009, at 8:26 AM, Kirk Wallace wrote:
On Thu, 2009-06-04 at 23:04 +1000, Erik Christiansen wrote:
The mill-drill which I'm starting to convert to CNC has 0.2mm
(0.008)
backlash in the Z feed, making it a much better candidate for stepper
control than servo, IIUC. There is
Dave Engvall wrote:
If you look at emc1 .ini files they had a set of parameters for at
least some of the
factors affecting axis motion. I think something was supposed to use
them to model
motion on the axis. I don't know it that ever worked. Maybe Ray H or
Matt S. can elucidate.
On Thu, Jun 04, 2009 at 09:42:21AM -0700, Dave Engvall wrote:
It may be possible to get more bang for your buck by purchasing a
better ball screw ( ebay or HIWin).
Thank you for that. I'm not sure that I'd trust ebay on duch products,
unless it's a recognised vendor using that means to
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