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Hi Khalid

Your perseverance and effort in designing your quilter / embroidery machine I really admire.

Quite a while back I purchased a Resta H 220 industrial quilting machine. it was too small...

Hi Routalot

Hmm Sorry about the previous link

Try this one.

https://grabcad.com/library/machine-to-mill-a-flat-surface-on-steel-tube-for-mounting-linear-rails-1

The machine as shown will...

Hi All

I have started this as a new thread.

I am building an open source machine to machine a flat surface on a steel tube or an applied strip on that tube.
Currently at version 54.

Below...

Hi All

I uploaded version 35 to GrabCad.
This is a major update. Many of the joints are now added.

457854

This design is a good example of working with laser cut material.. No welding!
...

Thanks Pete

Maybe I should have created a new thread? I do not want to hijack this one, however The title suggested it was on topic. If requested i would be happy to move it.

The thread over at...

Hi Pete

I said "I am building an open source machine to machine a flat surface on a steel tube or an applied strip on that tube."

It is not always feasible to directly machine a steel tube, due...

Hi All
I am building an open source machine to machine a flat surface on a steel tube or an applied strip on that tube.

Below is a link to GrabCAD Below that is a link to MYCNCUK where there is...

Hi Zorbit

I drew a tube within tube Z axis The cables would simply attach to the moving member. Only the pulleys at the top are required.

Many commercial machines use tube within tube however...

Hi Jon

As understand it you have used composites to reduce the mass of of the moving components of your design. While a composite beam will be lighter it will have more deflection than than a...

Hi John05

Some thinking on your counterweight system to balance the Z axis design weight of 120 kg?

The very basic approach would be to add a counterweight system right at the Z axis. This...

Hi All

Gee its been a while since I Posted in here!
I have started a thread at another place on building a new DIY CNC Mill Using Mineral castings, (Epoxy and aggregate concrete)

All the molds...

Hi
Here is another article worth reading - it deals with what is software....

Copyright v. Patent < Law < Software Pluralism

Some tests:
Has the CAD drawing at any time been owned by its...

The online Oxford Dictionary defines Software as....
"The programs and other operating information used by a computer:"

"Other operating information" covers a lot of ground

A CAD file is not...

The output of a CAD program is indeed a piece of software, a unique set of instructions that replicate a unique image created by a person. even if the software is never used and sits on a disk it is...

Lets look at the process. the drawing is loaded into the CNC system. for reproduction the same way a book is loaded into the typesetter pr printing. the cutter cut's the drawing into a sheet of...

Hi Gerry

So If I give the file to a laser cutter and order a run; does it mean that that person can then reproduce the item any time for anyone without my permission or is the design my property?...

My argument is that it is not possible to use the CAD file and G code to replicate the object without infringing.
Once you issue a cease and desist order claiming copyright protection, how does the...

Hi All

Background:
Recently I have been working on a machine that is mainly made from laser cut steel. maybe 90 % of the mass.
It has been my primary objective to produce the machine as a flat...

Hi Harryn

Good to hear of another use, I would really like to see a photo of your finished chuck.

The following link to the UK MEW Site (Very slow to open) is a post I made about a tower clock...

Hi jhudler

What did you use for the Gel coat? was it epoxy base or polyester. What release did you use?

Regards
John

Hi All

On the sag of a tensioned steel wire suspended in epoxy compared to Air; will the Catenary sag be less?
Refer my post #4770 above

The specific gravity of air is 740 times less than...

Hi John O'Hara

I have worked by volume with my epoxy experiments not by weight, and to determine volume I like to mix a sample batch of aggregate mixture then fill it with water measuring the...

Hi DaBit

Your work looks great.... And it is good to see quality machinery being built in this thread, Lets hope others follow. It needs to move to the applied engineering side, there is a lot of...

Hi DaBit

Some machine builders I have seen on the net using epoxy mineral cast frames bed the rails, rail supports and other parts in an epoxy grout as a secondary operation after the main casting...

Hi DaBit

Nice to see you using a surface plate to create a flat plane. The so called "negligible" shrinkage of epoxy appears to be working against you, that might explain the bow
Did you set the...

The trouble with glass is it is flexible unless it is fully supported there will be errors.

I guess this is the real bugbear with mineral castings .... How to cast against a truly flat surface....

Hi Igala

So has this thread like Lazarus risen from the dead?

Regards
John McNamara

Hi All

A little back of the envelope thinking......

Do micro or other materials improve the strength of epoxy composite structures, and if so what is the optimal physical size of the added...

Hi All

Have not been around for a while.....

This is a short easy to understand and to the point paper comparing the properties of epoxy Granite vs Steel and Cast Iron.

It compares test...

Hi

It is possible to drill epoxy granite....A carbide masonary drill in a drill press works, preferably a new sharp one.

I have also machined the face of an epoxy granite casting. The finish...