Re: [Emc-users] Auxiliary axis DRO only

2022-02-25 Thread andy pugh
On Fri, 25 Feb 2022 at 05:12, Ralph Stirling wrote: > > You don't need a joint at all. You can just have an encoder > channel that doesn't connect to any joint. True, though there is something to be said for having a dummy axis just so that the LinuxCNC GUI will display the encoder position. Yo

Re: [Emc-users] Auxiliary axis DRO only

2022-02-25 Thread Thaddeus Waldner
 >> You don't need a joint at all. You can just have an encoder >> channel that doesn't connect to any joint. I will look into the halsampler solution. Can you point me to a working example? The end goal is indeed a point cloud. One issue that might make it simpler (or not!) to have an actual

Re: [Emc-users] Auxiliary axis DRO only

2022-02-25 Thread Thaddeus Waldner
 > In that case, I'd design the probe to be held in the x axis, or crossfeed > if this is a lathe, with its own self contained contact closer, move y by > whatever increment is needed to get the y accuracy you need, and use the > std g38.2 probe to record the trip position. No, it’s not a cams

[Emc-users] Couple Q's re 4th axis on a mill.

2022-02-25 Thread gene heskett
Greetings all; I am about to install this rebuilt rotary drive on my 6040 mill, aligned to rotate stuff on the Y axis, which is the long axis on a 6040. Out of the alphabet of ABCUVW, which is the proper axis to call it? It will for the next job, be turning a 2"x2"x18" on center of its 2x2 end

Re: [Emc-users] Couple Q's re 4th axis on a mill.

2022-02-25 Thread ken.strauss
Perhaps I misunderstand but why do you plan to cut the thread in short pieces rather than the whole length but obviously in several passes due to allowed DoC and WoC? Is the final thread diameter to be about 2-inch or much smaller? In any case shouldn't you make the stock approximately round prior

Re: [Emc-users] Couple Q's re 4th axis on a mill.

2022-02-25 Thread andy pugh
On Fri, 25 Feb 2022 at 15:19, gene heskett wrote: > Out of the alphabet of ABCUVW, which is the proper axis to call it? If it is a rotary axis with an axis along Y then it is typically called "B". > And, does this change the kinematics module which is trivkins now? Probably not. It sounds like

Re: [Emc-users] Auxiliary axis DRO only

2022-02-25 Thread gene heskett
On Friday, February 25, 2022 9:05:45 AM EST Thaddeus Waldner wrote: > >> You don't need a joint at all. You can just have an encoder > >> channel that doesn't connect to any joint. > > I will look into the halsampler solution. Can you point me to a working > example? The end goal is indeed a poin

[Emc-users] caxis follows path

2022-02-25 Thread Thomas J Powderly
I had looked at a cnc nibbler and scrollsaw. I thought it might be nice if Axis could show the tool orientation. So I made a tiny hack in glcanon.py and minigl.c What I did was modify the disk on top of the cone, and the disks on top and bottom of round tools. I simply enabled and used the g

Re: [Emc-users] Auxiliary axis DRO only

2022-02-25 Thread gene heskett
On Friday, February 25, 2022 9:16:05 AM EST Thaddeus Waldner wrote: > > In that case, I'd design the probe to be held in the x axis, or > > crossfeed if this is a lathe, with its own self contained contact > > closer, move y by whatever increment is needed to get the y accuracy > > you need, and us

Re: [Emc-users] Couple Q's re 4th axis on a mill.

2022-02-25 Thread gene heskett
On Friday, February 25, 2022 10:27:56 AM EST ken.stra...@gmail.com wrote: > Perhaps I misunderstand but why do you plan to cut the thread in short > pieces rather than the whole length but obviously in several passes due > to allowed DoC and WoC? I don't Ken, I intent to cut the full length of th

Re: [Emc-users] Couple Q's re 4th axis on a mill.

2022-02-25 Thread gene heskett
On Friday, February 25, 2022 10:31:55 AM EST andy pugh wrote: > On Fri, 25 Feb 2022 at 15:19, gene heskett wrote: > > Out of the alphabet of ABCUVW, which is the proper axis to call it? > > If it is a rotary axis with an axis along Y then it is typically called > "B". That won't change then, tha

Re: [Emc-users] caxis follows path

2022-02-25 Thread gene heskett
On Friday, February 25, 2022 10:59:16 AM EST Thomas J Powderly wrote: > I had looked at a cnc nibbler and scrollsaw. > > I thought it might be nice if Axis could show the tool orientation. > > So I made a tiny hack in glcanon.py and minigl.c > > What I did was modify the disk on top of the cone,

Re: [Emc-users] Couple Q's re 4th axis on a mill.

2022-02-25 Thread Chris Albertson
Non-trivial kinematics is when moving one axis causes another axis to move. We call these "serial links" For example, if you were to mount one rotary axis "B" cross-wise on another rotary axis "A" such that moving "A" redefines where "B" is pointing to. This is common with robots but uncommon wi

Re: [Emc-users] Couple Q's re 4th axis on a mill.

2022-02-25 Thread gene heskett
On Friday, February 25, 2022 6:10:06 PM EST Chris Albertson wrote: > Non-trivial kinematics is when moving one axis causes another axis to > move. We call these "serial links" > > For example, if you were to mount one rotary axis "B" cross-wise on > another rotary axis "A" such that moving "A" r

Re: [Emc-users] F-Engrave and LinuxCNC scripting

2022-02-25 Thread cogoman via Emc-users
One option would be to generate one big G-code file, with the appropriate M-CODE to break it up, and an operator's comment to let you know which section is coming up next. 1.   The operator would get a message like:   (Prepare to carve Billy G's name) 2.   Put the part in the vise and

Re: [Emc-users] who has used thin client pcs

2022-02-25 Thread cogoman via Emc-users
I have found that the "Magic Pixie Dust" for a damp shop comes in a spray can called Caig deoxit.  The trick is pairing a contact cleaning solution with an appropriate oil that seals the contacts so that oxygen can't get into the connection. A church building is a great place for humidity rela

Re: [Emc-users] IJK vs R

2022-02-25 Thread cogoman via Emc-users
I believe that R arcs that are 90 degrees or less are going to come out very close to the IJK versions, but if you want a full circle, it's better to break it up into 4 90 degree arcs.  I don't know just where radius arcs start to diverge from IJK arcs, but I would guess that 180 and 360 degree

Re: [Emc-users] IJK vs R

2022-02-25 Thread Feral Engineer
Generally speaking, usually R breaks at 180° where IJK can do a full 360° arc with a single command. I think it's possible to go >180 with a negative R, but I'm not sure where that ends. I've never been a fan of R because it tends to break tangency where ijk are a little more strict. Phil T. The F

Re: [Emc-users] who has used thin client pcs

2022-02-25 Thread andrew beck
Awesome thanks On Sat, 26 Feb 2022, 16:27 cogoman via Emc-users, < emc-users@lists.sourceforge.net> wrote: > I have found that the "Magic Pixie Dust" for a damp shop comes in a > spray can called Caig deoxit. The trick is pairing a contact cleaning > solution with an appropriate oil that seals t

Re: [Emc-users] Auxiliary axis DRO only

2022-02-25 Thread Thaddeus Waldner
> > > I am not sure what the built-in parameters such as #<_Z> show in this > situation. I would suspect that it is commanded position but it's not > hard to find out. > I just ran the following gcode: (Configuration section) G20(Inches) F2(probe speed) #4=-1 (Y start) #5=.04 (Y increme

Re: [Emc-users] Auxiliary axis DRO only

2022-02-25 Thread Thaddeus Waldner
I found a workaround; It's possible to read HAL pins from g-code. The problem is they don't necessarily update after the program is started. But according to the manual, a state sync command--M66E0L0-- forces it to update. The problem is that this stops the motion, and now instead of a non-stop sca