I did exactly that with a BBB and Xylotex cape, using one of the unused
limit inputs for a single pulse per rev sensor. You might want to follow
the discussion on
https://groups.google.com/forum/#!topic/machinekit/RW_bnXdXzyE
(you'll have to read up to the end).
You need a little familiarity with
So I've done a little more investigation all without spending any money yet.
The Probotix web site links to the wiki which points to the MachineKit
LinuxCNC for the BBB.
I downloaded the 8GB image and installed it on a MicroSD card. Stuck it in
a Rev B (2GB FLASH) BBB and booted.
It shows up a
On 8/12/2015 6:22 AM, John Alexander Stewart wrote:
> 5) I've a larger, stronger lathe (a big brother to the Unimat - an Emco
> Compact-8) that is my target lathe for CNC; not sure if I'm going to
> develop the Unimat further.
That's what the Denford ORAC was based on. Somewhere there's a forum
On 8/12/2015 4:25 PM, Gene Heskett wrote:
> On Wednesday 12 August 2015 12:35:18 Dave Caroline wrote:
>
>> Why stepper ? gearing up the speed with a pulley even less sense, they
>> lose so much torque at a sensible lathe spindle speed that I cannot
>> understand the reasoning for going down the wro
On Wednesday 12 August 2015 12:35:18 Dave Caroline wrote:
> Why stepper ? gearing up the speed with a pulley even less sense, they
> lose so much torque at a sensible lathe spindle speed that I cannot
> understand the reasoning for going down the wrong rabbit hole.
>
> Just think what would happen
Why stepper ? gearing up the speed with a pulley even less sense, they
lose so much torque at a sensible lathe spindle speed that I cannot
understand the reasoning for going down the wrong rabbit hole.
Just think what would happen if your chatter frequency was anywhere
near the stepper resonance t
Hi Gene, Thanks,
Warning, Ramblings have been edited for size.
> Warning, generalized ramblings of an old fart follow.
.
> Usable torque was pretty much gone by 2000 rpm.
>
I agree. Since the resolution for the spindle isn't nearly as a big a deal
for a spindle I thought I'd use pulleys to st
> On Wednesday 12 August 2015 08:43:33 andy pugh wrote:
>
> > On 12 August 2015 at 13:36, Gene Heskett wrote:
> > > This is a case where a hardware stepgen might be needed as software
> > > only has a limit in output step frequency on the x86 driven pc of
> > > 40Khz that is largely removed by th
On 08/12/2015 07:43 AM, andy pugh wrote:
> On 12 August 2015 at 13:36, Gene Heskett wrote:
>> This is a case where a hardware stepgen might be needed as software only
>> has a limit in output step frequency on the x86 driven pc of 40Khz that
>> is largely removed by the use of something like a mes
> Hi John;
>
> I've a small Unimat SL that I've CNC'd (and talked about it at the last
> CNCWorkShop back in June, and in my blog)
>
> Some random thoughts:
>
> 1) Beaglebone is fine. Sure, graphics is slow, but so what? Change "Axis"
> to the DRO display and you are fine.
That's what I thought
On Wednesday 12 August 2015 08:43:33 andy pugh wrote:
> On 12 August 2015 at 13:36, Gene Heskett wrote:
> > This is a case where a hardware stepgen might be needed as software
> > only has a limit in output step frequency on the x86 driven pc of
> > 40Khz that is largely removed by the use of som
On 12 August 2015 at 13:36, Gene Heskett wrote:
> This is a case where a hardware stepgen might be needed as software only
> has a limit in output step frequency on the x86 driven pc of 40Khz that
> is largely removed by the use of something like a mesa 5i25 card.
The Beaglebone has a PRU (and a
On Wednesday 12 August 2015 01:31:07 John Dammeyer wrote:
> > I am one who is running a small lathe with LinuxCNC, which it does
> > far better than I can.
> >
> > This subject has come up in the past, and I don't recall anyone
> > saying "no it can't be done."
> >
> > Given a big enough motor, I
Hi John;
I've a small Unimat SL that I've CNC'd (and talked about it at the last
CNCWorkShop back in June, and in my blog)
Some random thoughts:
1) Beaglebone is fine. Sure, graphics is slow, but so what? Change "Axis"
to the DRO display and you are fine.
2) My OLD Unimat has a not so great spi
On 12 August 2015 at 09:37, John Dammeyer wrote:
> The lack of a spindle input or PWM output on the Probotix cape and the
> higher price of the PMDX cape rules out the Beagle for any sort of Linux CNC
> at the moment. That and what appears to be a lack of continuing support for
> the Beagle and L
> John,
>
> If you are using a stepper at any significant revs, will there not be a
problem
> as the torque drops off as the rpm increase (unlike a servo)?
>
> Marcus
Thanks Marcus,
Yes. I realize that.
The lack of a spindle input or PWM output on the Probotix cape and the
higher price of the P
John,
If you are using a stepper at any significant revs, will there not be a problem
as the torque drops off as the rpm increase (unlike a servo)?
Marcus
On 12 Aug 2015, at 08:28, John Dammeyer wrote:
>>>
>>> LinuxCNC can create any mixture of step pulses, PWM, and other ways of
>>> controll
> >
> > LinuxCNC can create any mixture of step pulses, PWM, and other ways of
> > controlling motors. The motor interface is modular and you can set it
up
> > to do just about anything.
> >
> >
> > jmkasun...@fastmail.fm
> >
>
> Linuxcnc doesn't actually support the beaglebone.
> It was suppor
> From: jmkasun...@fastmail.fm
> To: emc-users@lists.sourceforge.net
> Date: Wed, 12 Aug 2015 01:58:57 -0400
> Subject: Re: [Emc-users] BeagleBone and LinuxCNC for a lathe.
>
>
>
> On Wed, Aug 12, 2015, at 01:31 AM, John Dammeyer wrote:
> >
> > In this cas
On Wed, Aug 12, 2015, at 01:31 AM, John Dammeyer wrote:
>
> In this case I'm considering installing it on a Unimat Lathe. The 650 oz-in
> size 34 motor appears to be large enough compared to the small DC brush
> motor currently attached. I'd have to step up the RPM in order to get the
> turnin
> I am one who is running a small lathe with LinuxCNC, which it does far
> better than I can.
>
> This subject has come up in the past, and I don't recall anyone
> saying "no it can't be done."
>
> Given a big enough motor, I see no huge show stopper in substituting a
> stepgen for the pwmgen mo
On Tue, 2015-08-11 at 23:53 -0400, Gene Heskett wrote:
> On Tuesday 11 August 2015 21:43:46 John Dammeyer wrote:
>
> > I'm thinking of ordering one of the Probotix Breakout Boards for my
> > Beagle Bone Black. Probotix has a downloadable image of LinuxCNC so
> > getting it up and running shouldn'
On Tuesday 11 August 2015 21:43:46 John Dammeyer wrote:
> I'm thinking of ordering one of the Probotix Breakout Boards for my
> Beagle Bone Black. Probotix has a downloadable image of LinuxCNC so
> getting it up and running shouldn't be an issue.
>
> http://www.probotix.com/CNC-CONTROL-SYSTEMS/BR
I'm thinking of ordering one of the Probotix Breakout Boards for my Beagle
Bone Black. Probotix has a downloadable image of LinuxCNC so getting it up
and running shouldn't be an issue.
http://www.probotix.com/CNC-CONTROL-SYSTEMS/BREAKOUT-BOARDS/PBX-BB-BeagleBon
e-Breakout-Board
I've not looke
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