Re: [Emc-users] could Linux cnc control of unconventional mill design like this and general thoughts and comments.

Yes I have been playing with the FEM work bench in freecad. There is also a full blown FEA program from the french power company EDF it is open source and used to build all the french nuclear reactors and hydro electric projects so it is very robust and well audited. It is written in fortran

Re: [Emc-users] could Linux cnc control of unconventional mill design like this and general thoughts and comments.

yes this is a big issue rigidity and vibration damning have traditionally been done by increasing the mass and by using cast iron that has a natural tendency to absorb and dissipate vibration. You can build very rigid light wait structures but most of these have harmonics like a tuning fork.

Re: [Emc-users] could Linux cnc control of unconventional mill design like this and general thoughts and comments.

the industry sales pitch for the stewart platforms and delta machines is that they are dynamically stiff. that the servos force the frame into a rigid state. I'm not one to believe anything a salesman ( pirata ) says, but the early work at NIST says thats what happens i'm talking commercial

Re: [Emc-users] could Linux cnc control of unconventional mill design like this and general thoughts and comments.

On 8 November 2015 at 02:10, Kyle Kerr wrote: > Re: homing. Delta printers usually home at the top of their travel. When I > asked my CNC instructor about a delta mill he said the lack of rigidity > would kill accuracy. It can be done, in fact one of the very first applications

Re: [Emc-users] could Linux cnc control of unconventional mill design like this and general thoughts and comments.

This is cool with the six legs of a start platform the forces should be balanced as you have one leg in tension and the corresponding one in compression. I could see motor tuning could be fun with multiple pid loops all fighting each other. We will see if I get that far at least I know some

Re: [Emc-users] could Linux cnc control of unconventional mill design like this and general thoughts and comments.

On 11/8/2015 4:13 AM, linden wrote: > yes this is a big issue rigidity and vibration damning have > traditionally been done by increasing the mass and by using cast iron > that has a natural tendency to absorb and dissipate vibration. > > You can build very rigid light wait structures but most of

Re: [Emc-users] could Linux cnc control of unconventional mill design like this and general thoughts and comments.

Have a look at ABB robots flex picker. https://www.youtube.com/results?search_query=abb+robot+picker --- This email has been checked for viruses by Avast antivirus software. https://www.avast.com/antivirus --

Re: [Emc-users] could Linux cnc control of unconventional mill design like this and general thoughts and comments.

On 11/6/2015 5:29 PM, TJoseph Powderly wrote: > well it is like the rostock but has extra constraint in the extra 3 > tracks and arms > maybe this is to increase the rigidity. > > the standard rostock looks and feels really wiggly to anyone used to > tool room machines. > > the drawings _suggest_

Re: [Emc-users] could Linux cnc control of unconventional mill design like this and general thoughts and comments.

Hi Linden! On 07.11.2015 00:55, linden wrote: > Hello All, > > I have progressed a little with the design and modeling of the machine I > asked for help simulating. It has evolved a little over the last few > weeks. have a look at the pdf attached for pictures Another month and I > will be back

Re: [Emc-users] could Linux cnc control of unconventional mill design like this and general thoughts and comments.

Thanks for taking the time to look at the pictures and read through my chicken scratch notes. Now I know that Linuxcnc should be able to control something like this and we have a potential solution for homing. I will keep going. I really need a real Internet connection or some card board to

Re: [Emc-users] could Linux cnc control of unconventional mill design like this and general thoughts and comments.

Re: homing. Delta printers usually home at the top of their travel. When I asked my CNC instructor about a delta mill he said the lack of rigidity would kill accuracy. On Sat, Nov 7, 2015, 7:38 PM linden wrote: > Thanks for taking the time to look at the pictures and read

Re: [Emc-users] could Linux cnc control of unconventional mill design like this and general thoughts and comments.

On 6 November 2015 at 23:55, linden wrote: > Could linuxCNC something control this? or do I have 2 many variables with no > fixed base position? It is do-able, I think. You might have redundant constraint, if so the kinematics will need to be rather accurate. It is a bit like

[Emc-users] could Linux cnc control of unconventional mill design like this and general thoughts and comments.

Hello All, I have progressed a little with the design and modeling of the machine I asked for help simulating. It has evolved a little over the last few weeks. have a look at the pdf attached for pictures Another month and I will be back to the world of fast Internet and I should be able to

Re: [Emc-users] could Linux cnc control of unconventional mill design like this and general thoughts and comments.

http://seemecnc.com/products/rostock-max-complete-kit There are lots out there like that for 3D printing. > -Original Message- > From: linden [mailto:l...@island.net] > Sent: November-06-15 3:55 PM > To: emc-users@lists.sourceforge.net > Subject: [Emc-users] could Linux cnc control of

Re: [Emc-users] could Linux cnc control of unconventional mill design like this and general thoughts and comments.

well it is like the rostock but has extra constraint in the extra 3 tracks and arms maybe this is to increase the rigidity. the standard rostock looks and feels really wiggly to anyone used to tool room machines. the drawings _suggest_ use of iron C channel, so I _guess_ rigidity is sought

Re: [Emc-users] could Linux cnc control of unconventional mill design like this and general thoughts and comments.

this describes the stiffness and joint aspects better https://www.youtube.com/watch?v=SSSvKt92tnA no ball joints! a knuckle/nutating head on end of 'inverted rostock' -- ___