Re: [Emc-users] email failures.

[Erik Christiansen]

On 03.03.18 12:43, Chris Albertson wrote:
> I'm I the only one having problems sending email to the list server at
> Source Forge?There seem to be all kinds of assorted issues at the
> Source Forge end. missing DNS entries, server going off line.   The
> EMC username being "unknown" and some others.perhaps they are
> having problems.

On Feb 16th, Bram Moolenaar wrote on the vim-use ML:
"The recent (and ongoing) outage of the Vim website on SourceForge shows
again that this is not a good place to host Vim."

He has since asked for volunteers to expedite the transfer of Vim.org to
new hosting.

Nothing is forever, and a FOSS site which is floundering at the hands of
its third set of owners may not indefinitely remain our best home.

...

> What I'm thinking is that with the flight from Sourceforge to Gethun,
> source forge might be loosing revenue, laying off staff and
> downsizing.   I don't know, just a guess.   I doubt many new projects
> are using Source Forge.   How long can they keep the lights on and the
> staff paid?   Maybe I'm wrong but I follow several open source
> projects and I see a clear trend. -- 

The last rodent off a sinking ship will have the wettest pelt, despite
having to run the fastest. So long as our stuff is backed up elsewhere,
we won't go down with the ship, I figure. A contingency plan seems the
absolute minimum requirement at this stage.

Erik

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Re: [Emc-users] Need to select a timing belt type and size

[Chris Albertson]

On Thu, Feb 22, 2018 at 10:44 AM, N. Christopher Perry
 wrote:
>
>
>
> > On Feb 22, 2018, at 12:27 PM, Chris Albertson  
> > wrote
> Any pitch that provide at least 7 teeth on the motor sprocket is acceptable, 
> from a torque transmission / belt life stand point. On the other hand, the 
> larger the pitch the higher the peak torque you can transmit.  I should think 
> 3 mm is the right compromise.

What I found in the specs is that I could use a wider belt.   For
example a 12mm wide belt can transmit twice the torque of a 6mm wide
belt.But then I find that are side forces that force the belt in a
direction parallel to the pulley axis and the side force goes up as
the belt gets wider. Worse is that the larger GT2 pulleys lack
flanges.   The belt could walk of the pulley unless I resorted to high
belt tension and pulley flanges. The 9mm wide, 3 mm pitch belt
seems like it should work



-- 

Chris Albertson
Redondo Beach, California

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[Emc-users] email failures.

[Chris Albertson]

I'm I the only one having problems sending email to the list server at
Source Forge?There seem to be all kinds of assorted issues at the
Source Forge end. missing DNS entries, server going off line.   The
EMC username being "unknown" and some others.perhaps they are
having problems.


If it is just be or just other Gmail users i'll be quite but if the
problem is wide spread we ought to think about moving the list.

A related issue:  Do the developers actually LIKE Source Forge?   I
used to use it but like many moved to Github.  Mainly because Git is a
better way to work and secondly because the Github platform is simply
better.

What I'm thinking is that with the flight from Sourceforge to Gethun,
source forge might be loosing revenue, laying off staff and
downsizing.   I don't know, just a guess.   I doubt many new projects
are using Source Forge.   How long can they keep the lights on and the
staff paid?   Maybe I'm wrong but I follow several open source
projects and I see a clear trend.
-- 

Chris Albertson
Redondo Beach, California

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Re: [Emc-users] Need to select a timing belt type and size

[Chris Albertson]

On Thu, Mar 1, 2018 at 10:56 AM, jeremy youngs  wrote:
> Chris, what software are you using to generate gcode?


I download the STEP file from either Boston Gear or McMaster Carr or
some place like that can then import in into Fusion 360.  The import
is "perfect" in that I get a model made of curved surfaces without
"facets" so the model can be scaled with no loss of precision.   So it
is important to choose the "correct" format to download.  There are
quite a few options

One you import the model you almost certainly have to make changes.
The bore size of the hub is likely not to be what you want.   So first
step is to make the gear exactly as you would like it, including the
hub and even the size and thread pitch of the set screws.

Then there are two ways to make g-code:

1) If you are going to print the gear in plastic then Fusion has an
option to save the "body" as an STL file.  I set the allied error in
the STL to well less than 0.01mm.  Then the STL file is moved to
"Cura"  for slicing.   In Cura I set it up so the gear teeth get made
with 100% density (solid plastic) and the core to 50% density.  The
hub needs to be 100% too.  Layer hight at 0.1mm   It is a waste of
materials and TIME to make a 100% solid gear.   Cura will produce
g-code for the printer.

2) if you want to cut the gear in metal, Fusion 360 can do this
itself.  Although it does not know about speacilzed gear cutters and
will do it with a ball end mill and a 4th axis.  But this is about the
only way to make a helical gear in metal



-- 

Chris Albertson
Redondo Beach, California

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