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Messages - hunserv

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41
PoKeys / Re: How I made my pendant.
« on: October 09, 2009, 06:20:51 PM »
Thanks, your opinion does not upset me at all, tonight I just bout a keypad for start...
http://www.targus.com/Uk/product_details.asp?sku=AKP07EU

I want to customize this with keygrabber and screen modifications or such...
So far what I know is that I should study the customization manual :)

Anyway, what disadvantages I should count on if I use such keypad? (Versus Modbus or Pokeys inputs)

42
I just got a keypad, wireless, nice stuff:
http://www.targus.com/Uk/product_details.asp?sku=AKP07EU

Any hints on how those "quicklaunch" buttons work on the top of it? It would be nice to reconfigure those for MACH, too...

I intend to study the Mach2 customization manual that Brett recommended... anything else to read to be able to have a setup similar to his gamecontroller? (but on my keypad)

43
General Mach Discussion / Re: Shift Key
« on: October 09, 2009, 04:47:42 PM »
Hi byellin, been a while since your post about this MPG issue. Any progress since?

44
PoKeys / Re: How I made my pendant.
« on: October 08, 2009, 04:08:51 PM »
Nice pendant!

I am just trying to find out what pendant I would like to have, any suggestions for buttons to put on a custom pendant?
For layout I like the MP-01 pendant from Homanndesigns, but I would like to have some features on mine, as it can be seen on the MACH3 screen when we press TAB...
E.g. I'd like to have pushbuttons for continous jog in addition to the MPG... So a kind of mix between the on-screen and the MP-01 would be my first thought...
Or someone with more practical experience would advise to have less buttons?

45
So as I tested, Tempest Runs well with SS, too :)

Attached pictures:
1. CV ON (Standard MACH planner, fast machining, smooth curve, but too much rounding at edges)
2. * CV ON With tempest (Tempest Planner curves are smooth, edges are nice, machining is somewhat slower of course due to Jerk limitation)
3. CV OFF with angles >45deg (Standard planner, just setting for CV angle is different,  same result as above, with faster run, and a bit more hickup at direction changes)

* this has the nicest cut IMHO

Unexpected event:
WHen I played with jerk settings I experienced no bugs, but one part was damaged during the following process:
I started to cut a part, but I forgot the feedrate override at 5%, so after 10 seconds, I pressed reset for the FRO, and suddenly one of the axes wanted to go crazily fast, and it lost all of its steps... I have don this without tepmest before many times, but had not seen this happening... whatever.

Acceleration:
Before tempest, I had acc. settings at 250 for all axes. I tested max acc. for X and Y axes, it started to be unstable at 2000. at 1500 I could not make the machine loose any steps. (max vel currently is 200mm/sec with 0,0005mm microstep increment)

Jerk values:
The standard 5000 Jerk value brings noticable results, I made 2 tests: running with max. speed a 4x4 rectangle, and a 40x40 rectangle.
without tempest, the machine is fast, but jumps, with tepmest, based on jerk value it goes smoot enough below 10000 (machine is more or less solid, but the desk it stays on is far from that, so with a better base, a 20000 jerk value would be OK for its mechanics I suppose.)
Setting a jerk value of 200 makes the movements tender even on the floppy legs, but for small distances it is way too slow, I suppose such low jerk is applicable on machines with larger workspaces than mine.

Some questions:
WHen I use CV together with tempest, will tempest blend setting override CV settings? or how it is going to work?

Comment:
For the moment I decided to cut parts without tempest, but in the end it would be nice to have it always active, to protect the spindles. (I have another machine, solid as a rock, it can run at high accel. rates with 2kW servos, but that bang-bang is not good for the ballscrews)
Jerk on the small machine means it jumps, the large one "only" knocks... but I am more afraid of those knocks, if you know physics, you can guess why...
So the more Tempest is adopted to MACH, the happier I will be :)

About toolpath display:
I understand it has to calculate first to know the exact blends, accelerations, etc... but theoretically it should be possible that MACH "preprocesses" the Gcode file, and then it can draw what actually will be output for step pulses...
Of course if it is not written that way, it might be hard to reconfigure for this "simulation" mode...
I would see an advantage of it to know how much my real feed speed would deviate from my commanded feed... Benefit would be better chip load control.
e.g. I command F600 and I calculate that spindle should run at 10000 for proper chip load, but if there is a section where MACH can run at F100 only, then it will run at that low speed, but it won't touch spindle speed. with some materials it would lead to no chip formation, but friction only...
But this is another story I suppose, however, I would like to have some opinions about it :)
Or what I described above could be handled with software as MasterCam for instance? I have not that deep knowledge, but CAM software is aware of physical limitations of the machine tool, then it should be able to correct for those values...

46
As major bugs seem to be recovered, I am about to test this TempestPlanner. Tomorrow I give it a shot. At least we will see how it works with SS.

Today I was playing with 2D code, having both long and short segment parts.
It is done as engraving, I need to engrave both sharp corners for rectangles, and smooth curves for curved shapes.

CV OFF: Nice sharp edges, but at some parts the machine was bouncing. Result: Engraved rectangles are nice, but the curved shapes have wavy edges.

CV ON: Curved shapes have nicely connected edges, but the rectangles are rounded way too much.

At this point I examined what I could do with CV settings, and I realized, that there is no good solution, and I wanted to ask if there is a setting that might set blending in the function of joining segment length, and I just realized that Art was describing this in this Tempest thread at reply #46...

So I am really waiting for the moment to see what the result will be with tempest.
I already made some photos of CV ON and CV OFF problems, so I attach pictures. Green arrow OK, Red arrow NOK... (Shall I see the same differences on the toolpath display, too?)

47
SmoothStepper USB / Re: SS and spindle motor control
« on: September 25, 2009, 03:55:58 AM »
Hi,

So I have decided now to go for the PWM Spindle control, one question solved :)

Semi-OFF Topic:

However, I do not know if anyone can help with this:

My Spindle controller has 4 operating modes, and I do not know which one to choose, as tech. manual does not describe the exact differences of these modes:

-Mode for Constant Torque applications
-Mode for Variable Torque applications
-Mode for Constant Torque applications with sensorless flux vector control
-Mode for Variable Torque applications with Energy saving

This is a TELEMECHANIQUE Dirve, ALIVTAR series...
ANyone has an idea, or at least whom to ask? (Or should I try to contact manufacturer? but it is an old model)

*** GOt some info, spindles should be constant torque application... ***

48
SmoothStepper USB / Re: SS Locking up mach3
« on: September 14, 2009, 12:19:49 PM »
Jog, G-code execution works fine with SS, but:

If I give a manual G-code command, and I change the FRO setting by clicking on + button multiple times to increase feedrate, then timeout message comes...
Is it because I change it too quickly?
I am planning to have a pendant, and I wonder what will happen, if I use wheel for FRO settings, I am afraid the same issue will rise...
(Latest Mach version and SS plugin was downloaded (from warptech site) 2 weeks ago)

49
SmoothStepper USB / Re: Does the SS have PWM outputs?
« on: September 07, 2009, 01:49:31 PM »
Ok, but what can Mach / SS do?

50
SmoothStepper USB / Re: Smooth Stepper board with encoder feedback
« on: September 07, 2009, 04:46:50 AM »
If I connect encoders to normal inputs of the SS and configure mach to display them, what will be the max. encoder frequency that SS is able to handle? (to know if I can use normal inputs of SS to monitor position, as others wrote above)

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