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] Error with tripod sim can't find package Linuxcnc

>... >draft@X200CA-draft ~/Linuxcnc_Sim/linuxcnc/scripts $ ./linuxcnc you are running a RunInPlace build > >... >Note: Using POSIX non-realtime >Error in startup script: can't find package Linuxcnc > while executing >"package require Linuxcnc" you may have forgotten to source

Re: [Emc-users] could Linux cnc control of unconventional ... hydraulic

On Sun, 8 Nov 2015 15:47:37 + (UTC) richsh...@comcast.net wrote: > I suggest looking at a hydraulic approach. It eliminates all of the drive > lash problems with the rigidity problems that follow. Ingersoll Rand built a > prototype mill similiar to what you are describing, you may find

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

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

I suggest looking at a hydraulic approach. It eliminates all of the drive lash problems with the rigidity problems that follow. Ingersoll Rand built a prototype mill similiar to what you are describing, you may find getting in touch with them to be useful. However it goes, I see this adventure

[Emc-users] Error with tripod sim can't find package Linuxcnc

Hello all, At a loss cant figer out what is going on here I am trying to load the tripod sim in tklinux drop down list with no luck. See error below i get the same error with all 3 configurations in the tklinux drop down list. All the Axis sim choices work and some of the other ones as

Re: [Emc-users] Emc-users Digest, Vol 115, Issue 26

I would advise you run some diagnostics on your old PC before you spend too much time on it. UBCD (The Ultimate Boot CD) is a good group of utilities for that purpose. Ray --J. Ray Mitchell Jr. jrmitche...@gmail.com (818)324-7573 The dogmas of the quiet past, are inadequate to the stormy

Re: [Emc-users] could Linux cnc control of unconventional ... hydraulic

On 8 November 2015 at 21:12, andy pugh wrote: >> I suspect if a valve is used an motor running dynamic response could be >> good, do you know if it had good dynamic performance. > > Yes, it was running closed-loop (on force) fatigue tests at 20Hz. An example:

Re: [Emc-users] could Linux cnc control of unconventional ... hydraulic

On 8 November 2015 at 17:10, Karlsson & Wang wrote: > Hydraulic, that seems interesting how does hydraulic compare to a ball screw > then it come to back slash and accuracy? Accuracy is limited by the feedback device, I think. Servohydraulic cylinders are a

Re: [Emc-users] Emc-users Digest, Vol 115, Issue 26

On Sunday 08 November 2015 12:12:27 Paul wrote: > Thanks for every ones help. I have downloaded LinuxCNC and will > install it on my old PC. The current version I have keeps freezing > locking up the mouse and keyboard. If this does not work it will be a > new PC. > > Paul If the pc doesn't have

Re: [Emc-users] could Linux cnc control of unconventional ... hydraulic

On 8 November 2015 at 21:07, Karlsson & Wang wrote: > I suspect if a valve is used an motor running dynamic response could be good, > do you know if it had good dynamic performance. Yes, it was running closed-loop (on force) fatigue tests at 20Hz. -- atp If

Re: [Emc-users] could Linux cnc control of unconventional ... hydraulic

> On 8 November 2015 at 17:10, Karlsson & Wang > wrote: > > > Hydraulic, that seems interesting how does hydraulic compare to a ball > > screw then it come to back slash and accuracy? > > Accuracy is limited by the feedback device, I think. > > Servohydraulic

Re: [Emc-users] could Linux cnc control of unconventional ... hydraulic

On 8 November 2015 at 18:26, Karlsson & Wang wrote: > Servohydraulic cylinders have low friction instead of perfect sealing? The ones I have worked with, yes. I was at the high-force high-accuracy end, though. 250kN 100mm stroke, 0.001mm resolution. (Schenck

Re: [Emc-users] could Linux cnc control of unconventional ... hydraulic

> On 8 November 2015 at 18:26, Karlsson & Wang > wrote: > > > Servohydraulic cylinders have low friction instead of perfect sealing? > > The ones I have worked with, yes. > > I was at the high-force high-accuracy end, though. 250kN 100mm stroke, > 0.001mm

Re: [Emc-users] could Linux cnc control of unconventional ... hydraulic

Any know if this Bodine motor would be suitable for a milling head ? Bodine 42A5BEPM-E2 thank you, other rick On Sun, Nov 8, 2015 at 4:16 PM, andy pugh wrote: > On 8 November 2015 at 21:12, andy pugh wrote: > > >> I suspect if a valve is used an motor

Re: [Emc-users] could Linux cnc control of unconventional ... hydraulic

On 9 November 2015 at 01:38, linden wrote: > Not sure how well the 24volt 5 way > valves i have will put up with constant motion and at what speed. You need proportional valves ("Moog Valves") A hydraulic system could be excellent, but I see no way at all to do it cheaply. --

Re: [Emc-users] could Linux cnc control of unconventional ... hydraulic

I have some hydraulic bits and pieces laying around that may be usable for this. Just need to find some rams and or rig up some kind of position sensing system as the rams i have found with integrated position sensor are pretty spendy. Not sure how well the 24volt 5 way valves i have will put

Re: [Emc-users] could Linux cnc control of unconventional ... hydraulic

moog or pegasus. brands, those are the big names. they were used to move really heavy cast iron slides, often dovetail. messy ( plan on leaks and kitty litter ) the hydraulic supply tops up the volume from a reservoir that you keep full these are really really beefy systems. the internal of the

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] Emc-users Digest, Vol 115, Issue 26

Thanks for every ones help. I have downloaded LinuxCNC and will install it on my old PC. The current version I have keeps freezing locking up the mouse and keyboard. If this does not work it will be a new PC. Paul --- This email has been checked for viruses by Avast antivirus software.

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 ... hydraulic

there were hydraulic milling machines sold based on Moog hydraulics and Bridgeport iron. I assume those two companies could screw things up, but the world has moved on. To move a long distance takes a lot of power. Small movements with a lot of force behind them are really easy, that's why you