Messages

1

Tempest Trajectory Planner / Re: Tempest Planning - Preliminary information and testing

« on: March 29, 2010, 03:35:13 PM »

REally, 2 axis is good and 3rd axis is rough?  Or do you mean your using x,y an dA for example?
Its true that using rotart is not perfect as yet in tempest, Ive focused primarily on cartesian...
but using x,y and Z should be fine?


Art,
I went back to the machine to look at what was going on with the tool paths I was testing on my machine and realized the issue might have been short segment code vs longer segment code, so I squashed my drawing and made a flat short segment code of the same surface. I set the jerk to 10000  and the bend to 50 units.  I set the feed rate at 4000 mm/min the flat program ran at about 2000 mm/ min and the 3d at about 300 mm / min. I guess the issue was more the speed of the cut possible with smooth motion, hence my thought about applying the algorithm to the two flat axies and proportionally pulsing the third as it usually moves at lower rates relative to the other two. I am running a smooth stepper to alleviate my difficulties with windows interrupts. so I would think that calculation speed shouldn't be a problem, I haven't built my 4th axis on this machine yet,  so my comment on that was just assuming that  if the 3 axis motion was a lot slower, than 4 would add to the problem.

2

Tempest Trajectory Planner / Re: Tempest Planning - Preliminary information and testing

« on: March 25, 2010, 09:34:21 AM »

Art,
I know that the notion I had as I awoke this morning is an over simplification but since the 2axis motion of tempest is so smooth, I thought I'd throw it out there. 2 axis motion in g17, 18 or 19 is very good when the third axis is thrown in it starts to have a problem. I was wondering if it would be possible to use your algorithm to control the two primary axies and  pulse the third proportionally to the move with the other two, using the assumption that the third is usually going to be within the jerk parameters of the other two. since the 4th is usually a rotary, I wonder if it could be done the same way?

3

Galil / Re: Mach3 + Galil

« on: March 23, 2010, 11:54:01 AM »

I am curious if the trajectory planning is done completely in the mach3 interface, or is that left to the Galil card? I have read some posts which indicate that 4 axis motion is not handled in cv in mach3 and I 'm wondering if I am going to be able to run my machine with good throughput with out the cv operational in 4 axis mode. I am currently running a smooth stepper and mach 3 I haven't gotten every thing fully operational, but know from experience that I will need smooth 3 and 4 axis interpolation to have this machine be fully useful. 

4

General Mach Discussion / Re: rough motion

« on: January 29, 2010, 09:18:33 PM »

Hood, just thought I'd let you know, I ordered my smooth stepper, it arrived as I left for a trip to a trade show, and I just now had time to set it up. I rescaled to 1:1 and the motion is now very good. I also have tried the tempest planner and the motion was phenomenal, I haven't cut any thing but air yet but it's looking good. so far it appears all of my motion problems were related to the wonders of windows.

5

General Mach Discussion / Re: rough motion

« on: December 10, 2009, 05:47:38 PM »

I followed your suggestion and cut the resolution by 5 and it was a world of difference. I'll place my order for a smooth stepper right away. I only switched one axis and the I left. it was still clunking a bit but it is lighter than the other, so it's less obvious.

Thanks again, I'm sure I'll have more issues before it's all over

6

General Mach Discussion / Re: rough motion

« on: December 10, 2009, 04:50:48 PM »

I have the kernel set at 100k but I have tried it at lower speeds as well. I'll try it with the gearing suggestion and let you know,

Thanks

7

General Mach Discussion / rough motion

« on: December 10, 2009, 02:56:51 PM »

I have an old motion master I am converting for my use I have granite devices drivers on fanuc motors 1000 steps to the mm. resolution. at 2000mm/min I get pretty good motion above that I get hammering in both the x and y axis . including jog. I have tried tempest too and get very smooth motion just too slow to be viable for production. I cleaned out the startup and several other non essential windows functions. it helped but not the final solution. I assume that  if this is a windows issue that a smooth stepper or another motion card would take care of my problem .

I would like to get input from some of you who have had to deal with these issues, the computer I am running the machine with is an IBM p4 with more than the minimum requirements per the mach 3 specifications.