Thanks Kurt.
I hope you can get that top sticker back on without any damage.
For a low cost device, I expected a much lower parts count. If I had just
that PCB made locally it would come out at about $8
It's often disheartening that whatever you might consider making, the
Chinese are pumping them
On 03/01/2017 10:16 PM, Gene Heskett wrote:
> On Wednesday 01 March 2017 22:31:31 Jon Elson wrote:
>
> I also have a button that has to be held to enable jogging,
> so there will be no jitter (or movement at all) when that
> button is not being pressed. That saves me from accidents
> when I bump t
On Wednesday 01 March 2017 23:47:59 Kurt Jacobson wrote:
> > What sort of bearings if any does the shaft spin in?
>
> Gene, I don't want to remove the encoder disk as it has to be
> positioned just right, but I can just see through the encode slots
> what looks to be the outer race and metal shiel
On 01.03.17 09:14, Chris Albertson wrote:
> Oh, you are planning to MAKE the encoder? You can always salvage one off
> an old printer or copy machine. I've found encoder wheels with thousands
> of divisions and the optical sensor to read them. Also you can find good
> plastic gears and you ca
>
> What sort of bearings if any does the shaft spin in?
Gene, I don't want to remove the encoder disk as it has to be positioned
just right, but I can just see through the encode slots what looks to be
the outer race and metal shield of a small ball bearing that the shaft runs
in. Pretty impress
On Wednesday 01 March 2017 22:31:31 Jon Elson wrote:
> On 03/01/2017 12:43 PM, Peter C. Wallace wrote:
> > On Wed, 1 Mar 2017, Kirk Wallace wrote:
> >> Date: Wed, 1 Mar 2017 09:55:49 -0800
> >> From: Kirk Wallace
> >> Reply-To: "Enhanced Machine Controller (EMC)"
> >>
> >> To: emc-users@lis
On 03/01/2017 04:40 PM, Steve from Tube Gauge wrote:
>
>
>
>
> Hi, I have a 1988 First CNC mill that I am considering
> retrofitting to accept LinuxCNC. The motors are Fanuc red cap with
> 1 ppr. How long will these encoders last? They are all ready
> 29 years old. I have oth
On 03/02/17 10:31, Jon Elson wrote:
> ---snip---
> I use a 100 "pulse" MPG, and the encoder counter counts all
> transitions, and have no problem with jitter, and can count
> off the detent clicks by feel. There isn't much jitter on a
> 100 pulse/rev encoder, especially with the detent.
> I als
On Wednesday 01 March 2017 22:08:50 Kurt Jacobson wrote:
> Since there has been a significant amount of discussion about the
> cheap MPGs I decided to take mine apart and find out how they work. I
> took a bunch of pictures during the disassembly, you can find them
> here: https://goo.gl/photos/w8
On 03/01/2017 12:44 PM, Ken Strauss wrote:
> I recently got a Renishaw MP7 IR probe from eBay. Has there been any further
> success with reverse engineering the interface? According to the manual that
> came with my probe it is turned on/off by briefly spinning it at 500 rpm to
> actuate an interna
On 03/01/2017 12:43 PM, Peter C. Wallace wrote:
> On Wed, 1 Mar 2017, Kirk Wallace wrote:
>
>> Date: Wed, 1 Mar 2017 09:55:49 -0800
>> From: Kirk Wallace
>> Reply-To: "Enhanced Machine Controller (EMC)"
>>
>> To: emc-users@lists.sourceforge.net
>> Subject: Re: [Emc-users] MPG detents
>>
>> O
On 03/01/2017 12:19 PM, Roland Jollivet wrote:
> I presume then, that if you feed a binary increment into
> LCNC, instead of a quadrature increment, it would show an
> error state?
Maybe, depending on how the digital filter works. It might
just ignore all illegal state transitions, and therefor
Since there has been a significant amount of discussion about the cheap
MPGs I decided to take mine apart and find out how they work. I took a
bunch of pictures during the disassembly, you can find them here:
https://goo.gl/photos/w8fJaFLzzUsFzfmV7
It turns out that they use a simple flat spring a
On Wednesday 01 March 2017 09:00:50 TJoseph Powderly wrote:
> heres some wild kins for ya
> http://en.sv-jme.eu/data/upload/2015/01/03_2013_1619_Zivanovic_04.pdf
> i was looking at how NX and Catia required the machine's kins to
> output gcode
> and stumbled on this paper
> i laughed out loud when
On Wednesday 01 March 2017 07:42:17 Roland Jollivet wrote:
> I had always assumed that machine MPG's generated one state change per
> click, but following Gene's discussion, I pulled out my 1988 Fanuc
> MPG, and saw that it was also 4-states per click. Obviously, one
> 'pulse'/detent
>
> Does anyo
Greetings list members;
With all the talk or ARM vrs AVR vrs all others etc. I have a question for
those who might be able to point me towards a workable solution.
Back in the early 80's my uncle purchased a HAAS 5C programmable indexer. This
is the hardware that basically was the original foun
On 1 March 2017 at 22:40, Steve from Tube Gauge wrote:
> How long will these encoders last?
If they are from 1988 then I would expect them to use LEDs rather than
filament bulbs, so they ought to last a long time.
But then, they have already lasted a long time :-)
They are probably in a good pa
Hi, I have a 1988 First CNC mill that I am considering
retrofitting to accept LinuxCNC. The motors are Fanuc red cap with 1
ppr. How long will these encoders last? They are all ready 29
years old. I have other machines with dying encoders and linear scales
and it usually s
We found out in Wichita that the Pico drives can't handle a high enough
voltage for these servos. So that is why the decision to get the the AMC
BE25A20 drives when some became available. The 'E' in the part number is
because they will accept encoder input for running in velocity mode, so
in this c
On Wednesday 01 March 2017 05:14:19 Erik Christiansen wrote:
> On 01.03.17 03:53, Gene Heskett wrote:
> > That will be its minimum jog increment. At .0001 it looks right,
> > for inches, but is it, given that scale in inches?
> >
> > Would .000254 then be correct for a .01mm move?
>
> $ units -1
I recently got a Renishaw MP7 IR probe from eBay. Has there been any further
success with reverse engineering the interface? According to the manual that
came with my probe it is turned on/off by briefly spinning it at 500 rpm to
actuate an internal centrifugal switch. It uses a standard 9v battery
On Wed, 1 Mar 2017, Kirk Wallace wrote:
> Date: Wed, 1 Mar 2017 09:55:49 -0800
> From: Kirk Wallace
> Reply-To: "Enhanced Machine Controller (EMC)"
>
> To: emc-users@lists.sourceforge.net
> Subject: Re: [Emc-users] MPG detents
>
> On 03/01/2017 04:42 AM, Roland Jollivet wrote:
>> I had alwa
On 1 March 2017 at 19:55, Kirk Wallace wrote:
> On 03/01/2017 04:42 AM, Roland Jollivet wrote:
> > I had always assumed that machine MPG's generated one state change per
> > click, but following Gene's discussion, I pulled out my 1988 Fanuc MPG,
> and
> > saw that it was also 4-states per click.
On 03/01/2017 07:58 AM, dragon wrote:
> What are the advantages and disadvantages of using PWM input vs. analog
> input servo amplifiers?
Simpler, no DAC on the control, no analog input circuitry on
the servo amp. No drift when the servo amp is enabled but
the LinuxCNC positioning loop is "off".
2017-02-25 23:46 GMT+02:00 Charles Steinkuehler:
> Is anyone else doing 5-axis machining with genserkins?
>
Not exactly machining... but I'm building a 3D printed stepper driven
6-axis robot arm. So I hope that I'm going to need genserkins soon.
The AB behavior you describe (if I get it correct)
On 03/01/2017 07:46 AM, dragon wrote:
> I have a project coming up soon that involves a retrofit of a Cel-Con
> HMC. The owner has a bunch of AMC BE25A20 drives to use on it. The servo
> motors are Fanuc red caps and we have some of Pico Systems' converters
> that give us the hall and encoder signa
On 03/01/2017 06:42 AM, Roland Jollivet wrote:
> I had always assumed that machine MPG's generated one state change per
> click, but following Gene's discussion, I pulled out my 1988 Fanuc MPG, and
> saw that it was also 4-states per click. Obviously, one 'pulse'/detent
>
> Does anyone know the rat
On 03/01/2017 04:42 AM, Roland Jollivet wrote:
> I had always assumed that machine MPG's generated one state change per
> click, but following Gene's discussion, I pulled out my 1988 Fanuc MPG, and
> saw that it was also 4-states per click. Obviously, one 'pulse'/detent
>
> Does anyone know the rat
The kinematics in the control have very little or nothing to do with the
code interpretation. It is only used to tie the machine components together
with the control.
The kinematics in the post processor (CAM System) have very little or
nothing to do with the control nor the kinematics in the contr
Ah... so in this case, the amplifier itself would do the inner velocity
loop. The outer position loop is all that is expected from LinunxCNC then.
On 03/01/2017 11:24 AM, Nicklas Karlsson wrote:
> On Wed, 1 Mar 2017 07:46:24 -0600
> dragon wrote:
>
>> I have a project coming up soon that invol
On Wed, 1 Mar 2017 07:46:24 -0600
dragon wrote:
> I have a project coming up soon that involves a retrofit of a Cel-Con
> HMC. The owner has a bunch of AMC BE25A20 drives to use on it. The servo
> motors are Fanuc red caps and we have some of Pico Systems' converters
> that give us the hall and e
> What are the advantages and disadvantages of using PWM input vs. analog
> input servo amplifiers?
Electrical noise. It is usually possible to generate and sample flanks width
the accuracy of the clock.
--
Check out the
I've learned to use the spinny knob on the BP Discovery 308 but at first
missed the detent...
JT
On 3/1/2017 10:57 AM, Roland Jollivet wrote:
> I thought that if 100 detents and 1tick/detent was all that was needed,
> then it would be simple to make. 400 ticks/rev is still do-able, but
> anythi
Oh, you are planning to MAKE the encoder? You can always salvage one off
an old printer or copy machine. I've found encoder wheels with thousands
of divisions and the optical sensor to read them. Also you can find good
plastic gears and you can make a geared encoder that runs faster then the
On 03/01/2017 11:31 AM, Chris Albertson wrote:
> I think when you design one of these you have freedom to define the
> mechanical detents per revolution and the number of encoder "ticks" per
> revolution independently. You are arguing for these numbers to always be
> the same. But why? Why not
I thought that if 100 detents and 1tick/detent was all that was needed,
then it would be simple to make. 400 ticks/rev is still do-able, but
anything above that means a purchased encoder, and then the incentive is
lost.
I think the detent is invaluable where any overshoot will crash the tool.
I think when you design one of these you have freedom to define the
mechanical detents per revolution and the number of encoder "ticks" per
revolution independently. You are arguing for these numbers to always be
the same. But why? Why not 10 ticks per detent? I think with a jog
wheel the hi
On Wednesday 01 March 2017 04:49:11 andy pugh wrote:
> On 1 March 2017 at 04:32, Gene Heskett wrote:
> > Are you saying the html docs on the wiki are more up to date?
>
> The Wiki and the HTML docs are completely separate things.
>
> The HTML docs get updated every time the code gets changed, the
Unfortunately the drives I have played with could not bat switch. But the one
torque mode BLDC set up I have worked with was a PITA to tune, until I set up a
dual PID loop in Linuxcnc (essentially turning it into a velocity controlled
system.)
- Original Message -
From: "dragon"
To: "
Thanks Chris...
Yeah, if no one chimes in with some actual experience I might just have
to do that experiment.
That Cel-Con should be capable of some pretty decent speeds and does
have a bit of mass so that should be a good test.
On 03/01/2017 09:23 AM, Chris Radek wrote:
> On Wed, Mar 01, 201
Thanks, got it..
Roland
On 1 March 2017 at 17:11, Kurt Jacobson wrote:
> There is no "divide by 4", the machine just moves in increments that are
> one fourth the jog increment. For example if you have the increment set to
> .001 the machine will move .00025 four times per detent, which does r
On Wed, Mar 01, 2017 at 07:46:24AM -0600, dragon wrote:
> better to run the servo amplifiers in velocity mode or torque mode. I
I think the benefits of velocity mode are that it better tolerates
(still gives smooth motion with) low encoder resolution and low servo
cycle update rates, and it's muc
There is no "divide by 4", the machine just moves in increments that are
one fourth the jog increment. For example if you have the increment set to
.001 the machine will move .00025 four times per detent, which does result
in 4 times smother moment.
Kurt
On Wed, Mar 1, 2017 at 10:01 AM, Roland Jo
On 1 March 2017 at 16:02, John Kasunich wrote:
>
>
> On Wed, Mar 1, 2017, at 07:42 AM, Roland Jollivet wrote:
> > I had always assumed that machine MPG's generated one state change per
> > click, but following Gene's discussion, I pulled out my 1988 Fanuc MPG,
> and
> > saw that it was also 4-sta
On Wed, Mar 1, 2017, at 07:42 AM, Roland Jollivet wrote:
> I had always assumed that machine MPG's generated one state change per
> click, but following Gene's discussion, I pulled out my 1988 Fanuc MPG, and
> saw that it was also 4-states per click. Obviously, one 'pulse'/detent
>
> Does anyone
heres some wild kins for ya
http://en.sv-jme.eu/data/upload/2015/01/03_2013_1619_Zivanovic_04.pdf
i was looking at how NX and Catia required the machine's kins to output
gcode
and stumbled on this paper
i laughed out loud when i saw the AXIS screen
tomp tjtr33
---
What are the advantages and disadvantages of using PWM input vs. analog
input servo amplifiers?
Unless I am mistaken, it looks like it is easier to drive the PWM input
ones as they can be driven directly off of something like a Mesa 6i24
without the need for the additional analog interface card. I
i think...
On 03/01/17 09:16, Charles Steinkuehler wrote:
> On 2/28/2017 5:52 PM, andy pugh wrote:
>> On 26 February 2017 at 22:46, Charles Steinkuehler
>> wrote:
>>> The A and B Axis has no
>>> dependency on the rotation of the base of the robot arm (joint-0).
>>>
>>> Is this the expected behavi
I have a project coming up soon that involves a retrofit of a Cel-Con
HMC. The owner has a bunch of AMC BE25A20 drives to use on it. The servo
motors are Fanuc red caps and we have some of Pico Systems' converters
that give us the hall and encoder signals from the motors.
I have been doing a bunch
Maybe I can help a little on this subject.
In 5-axis machining the 4th and 5th axes are controlled in coordinated
moves with the x, y, and z axes.
For both configurations, tilting and rotating spindle or tilting and
rotating tables, the CAM program must create the correct GCODE for all the
axes i
I had always assumed that machine MPG's generated one state change per
click, but following Gene's discussion, I pulled out my 1988 Fanuc MPG, and
saw that it was also 4-states per click. Obviously, one 'pulse'/detent
Does anyone know the rationale behind this?
I assumed one always wants one step
On 01.03.17 03:53, Gene Heskett wrote:
> That will be its minimum jog increment. At .0001 it looks right, for
> inches, but is it, given that scale in inches?
>
> Would .000254 then be correct for a .01mm move?
$ units -1
You have: .01 mm
You want: in
* 0.00039370079
The *25.4 factor
On 1 March 2017 at 02:16, Charles Steinkuehler wrote:
>
> Perhaps a different way of asking my question:
>
> Given two types of 5-axis machine, one with A and B pivots on the
> spindle, and one with A and B pivots on the table, would identical
> gcode be expected to produce identical results on th
On 1 March 2017 at 04:32, Gene Heskett wrote:
> Are you saying the html docs on the wiki are more up to date?
The Wiki and the HTML docs are completely separate things.
The HTML docs get updated every time the code gets changed, they are
100% up to date.
Go to www.linuxcnc.org and click "Docume
Greetings all;
The scale Andy suggested, but it seems like I can't get the right result.
pseudo example:
2 mult2's, named & addf'd in sequence, all running in the slow thread.
setp mult2x.in0 [JOINT_0]SCALE # is -25685 for an inch
setp mult2x.in1 .0001
net jogxmult2x.out mult2x1.in0
Simplest: Put the data in a big spread sheet, one row per sample. Spread
sheets make good data bases if you only have a few thousand rows. You can
graph, filter, search and operate on the data interactively.
More Sophisticated: "R".
https://www.r-project.org/about.html
https://en.wikipedia.org/w
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