Re: [CAD_CAM_EDM_DRO] Re: Aussie Members

Hello,

Speaking of speed and acceleration, either one too high can make you
lose steps.

Set your acceleration low until you find the upper limit on velocity.
Use a run of several inches to test velocity. Let it accelerate for the
first inch or more so that acceleration is not taxing the motors. If the
acceleration is low you can hear it ramp up to speed over the first inch
or two of travel.

After you find the highest velocity that will run without losing steps,
set the rapid velocity limit to a value lower than that velocity.
Somewhere between 50% and 80% of the velocity that sometimes loses
steps.

Then tune your acceleration. Increase the acceleration until steps are
lost then reduce it to a safer value.

I usually just use an acceleration that requires 1 second to get up to
full speed. That is adequate and I don't have to spend time
experimenting to find a faster value. One second of acceleration is fast
enough and yet unlikely to tax the motors.

Tom Hubin
thubin@...

*************************************

caudlet wrote:

>
> --- In CAD_CAM_EDM_DRO@yahoogroups.com, "john" <johngo@k...> wrote:
> > Hi Dan.
> > Thanks for the info,I 'm using a Hobby cnc board with four axis. So
> far I've
> > managed to get all the motors running in the right directions and
> at the
> > proper speeds.One of the main problems that I've had is the G code
> G0, it's
> > the rapid return and it's to fast for the motors they just stand
> still. I
> > overcame the problem by going into edit and changing the G0 for F9
> and this
> > seems to work well I'm not sure if it's correct, but it's
> effective, I have
> > to learn how to regulate the G0 code to reduce the speed.
>
> You need to tune your motor setup for max speed on the motors below
> lost steps or lock ups. G0 just says "Go as fast as the maximum
> rapids you have set". Every motor/driver combination has a point at
> which it will start to lose steps and/or lockup. you need to find
> that point in the tuning then back off by 20%. MACH2 has a motor
> tuning section that allows you to set velocity and acceleration on
> each axis motor. If you need help with the settings post on the
> MACH1MACH2CNC group.
> >
> >
> > ----- Original Message -----
> > From: "Dan Mauch" <dmauch@s...>
> > To: <CAD_CAM_EDM_DRO@yahoogroups.com>
> > Sent: Monday, January 24, 2005 3:55 AM
> > Subject: Re: [CAD_CAM_EDM_DRO] Aussie Members
> >
> >
> > >
> > > Some of my customers have run into the issue of Mach2/mach3
> being way too
> > > complex. Indeed, the standard screens are extremely busy and has
> a ton of
> > > information but for the most part you will only read the digital
> display,
> > > press the cycle start, stop, pause, rewind buttons and use the
> MDI
> > > feature.
> > > There is also a simple screen that gets rid of most of the unused
> features
> > > and is just a simple screen with the basics. You should be able
> to d/l the
> > > simple640.set screen from the mach2 user group. If not I can
> email it to
> > > you.
> > > On the other hand you can also look at deskcnc. Its cnc screen is
> pretty
> > > basic.
> > > Dan
> > > dmauch@s...
> > > www.seanet.com/~dmauch
> > >
> > > ----- Original Message -----
> > > From: "johngo602000" <johngo@k...>
> > > To: <CAD_CAM_EDM_DRO@yahoogroups.com>
> > > Sent: Sunday, January 23, 2005 1:25 AM
> > > Subject: [CAD_CAM_EDM_DRO] Aussie Members
> > >
> > >
> > >>
> > >>
> > >>
> > >> G/Day
> > >>
> > >> I'm new to the game and have just finished building the
> electronics
> > >> for my router, At the moment I/m trialing Mach 2 with some
> > >> reservations as to the compexity of the program. I would be
> > >> interested if there were any members from Australia in the group
> > >> that shared like interests. I live in the NSW area.
> > >>
> > >> Thanks
> > >> John.
> > >>
> > >>
> > >>
> > >>
> > >>
> > >
> > >
> > >
> > > Addresses:
> > > FAQ: http://www.ktmarketing.com/faq.html
> > > FILES: http://groups.yahoo.com/group/CAD_CAM_EDM_DRO/files/
> > > Post Messages: CAD_CAM_EDM_DRO@yahoogroups.com
> > >
>
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