On Fri, 26 May 2023 at 01:51, BRIAN GLACKIN wrote:
> More modern cements originate from work by Aspdin (sp) from Leeds
That appears to be the correct spelling:
https://en.wikipedia.org/wiki/Portland_cement
--
atp
"A motorcycle is a bicycle with a pandemonium attachment and is
designed for the
Very true
For the most part the knowledge was misplaced with the fall of said empire.
For over a millennia after, lime mortars were the main “cement” but was not
“hydraulic” (set under water) like the original Roman cement. Very
important when building harbors.
More modern cements originate
Practical concrete was created by the Romans and in use from around 600BCE.
Scott
On Monday, May 22, 2023 at 05:37:46 PM CDT, BRIAN GLACKIN
wrote:
Thanks Andy
The articles I knew of were of much more recent vintage.
This article confirms the design was originally for “shell”
On 5/22/23 18:36, BRIAN GLACKIN wrote:
Thanks Andy
The articles I knew of were of much more recent vintage.
This article confirms the design was originally for “shell” lathes where
they could manufacture a lathe in place and have it operational in 30ish
days. I was surprised it was WW1 as
Thx to all responses
Andy the pdf was very interesting.
bearings line jigged and clearances filled wit some babbet like material
to assure allignment
hmmm old school additive construction vs expected line boring
i read it looking for how it was about casting stiffenss, but thanks for
an
Thanks Andy
The articles I knew of were of much more recent vintage.
This article confirms the design was originally for “shell” lathes where
they could manufacture a lathe in place and have it operational in 30ish
days. I was surprised it was WW1 as the cement technology at the time was
On Sun, 21 May 2023 at 23:57, BRIAN GLACKIN wrote:
> During ww2 they made lathes bodies out of concrete with imbedded steel
> parts that were jigged in form or line bored for the spindle and tail
> stock.
More info here:
ady strong. Perhaps a mix of glass fibre and granite would
be the best.
John
-Original Message-
From: BRIAN GLACKIN [mailto:glackin.br...@gmail.com]
Sent: May 21, 2023 3:54 PM
To: Enhanced Machine Controller (EMC)
Subject: Re: [Emc-users] Sewing Machine Stiffness
Epoxy is a bonding agent
Fi
Epoxy is a bonding agent
Fiber (glass or otherwise) add cross linking in the resulting matrix.
Thes two Used alone, the resulting composite will be weak.
You need sized aggregate to make a much more rigid and robust structure.
The epoxy is then strongest bonding all these parts together
Sand
On 5/21/23 05:00, Nicklas SB Karlsson wrote:
lör 2023-05-20 klockan 23:28 +0700 skrev Thomas J Powderly:
I saw an overarm router recently
and wondered if a sewing machine frame was stiff.
Compared to a desktop gantry mill.
Gantry ought to be more stiff.
That depends on the gantry, my
On 5/21/23 02:56, marcus.bow...@visible.eclipse.co.uk wrote:
On 2023-05-21 03:43, Chris Albertson wrote:
Even 3D-printed PLA plastic can be strong enough. I have a 3D-printed
CNC conversion of a harbor freight milling machine. Normally they use
metal parts for the motor mounts and such but
lör 2023-05-20 klockan 23:28 +0700 skrev Thomas J Powderly:
>
> I saw an overarm router recently
>
> and wondered if a sewing machine frame was stiff.
>
> Compared to a desktop gantry mill.
Gantry ought to be more stiff.
___
Emc-users mailing list
On 2023-05-21 03:43, Chris Albertson wrote:
Even 3D-printed PLA plastic can be strong enough. I have a 3D-printed
CNC conversion of a harbor freight milling machine. Normally they use
metal parts for the motor mounts and such but PLA can be just as rigid
if you make the parts thicker.
Yes;
> On May 20, 2023, at 2:12 PM, marcus.bow...@visible.eclipse.co.uk wrote:
>
>
> Interesting idea, which makes a lot of sense.
> So you would end up with a 'solid' epoxy/glass mix. What would its
> performance be like compared to a heavy dense epoxy/stone mix?
Glass and stone are not much
Epoxy wouldn't be a good material for a long, unsupported beam like that, even
if filled with glass fiber. A cast iron sewing machine arm isn't going to
eventually sag under its own weight, though it may not be shaped to withstand
horizontal bending and longitudinal twisting forces without some
On 2023-05-20 20:12, Chris Albertson wrote:
If you are going to the trouble of filling a frame with epoxy then two
things…
1) Why bother with the frame, just print a plastic mold and fill that.
with epoxy. Then it will be the exact size and shape you need.
Interesting idea, which makes a
If you are going to the trouble of filling a frame with epoxy then two things…
1) Why bother with the frame, just print a plastic mold and fill that. with
epoxy. Then it will be the exact size and shape you need.
2) Don’t use epoxy as it is not very stiff, Mix the epoxy with glass fiber
On 5/20/23 13:39, Chris Albertson wrote:
I think there would be a huge variation. A cheap $100 consumer sewingmachine
would not be at strong as an industrial sewing machine that sells for 20 times
as much.
One problem with many homemade gentry machines is that people us too-thin
material
You'd need to get a frame casting, set up indicators, then do some pushing,
twisting, and leaning on it to see how much it moves.
What could stiffen it is filling all its internal space with epoxy. The upper
casting from one of these
I think there would be a huge variation. A cheap $100 consumer sewingmachine
would not be at strong as an industrial sewing machine that sells for 20 times
as much.
One problem with many homemade gentry machines is that people us too-thin
material for the base.If the gantry rails are
20 matches
Mail list logo
