Messages

21

General Mach Discussion / G81 Question

« on: December 30, 2006, 10:08:12 AM »

When I run my program i get the following errors

" R less than Z in cycle in xy plane on line #8"
here is the actula line of code
N45 G81  X0.4771  Y1.1648  Z0.5000  R0.0000  F3.00

If R specifies the up position and
Z specifies the drill position
shouldn't r be less than z with mill head going down to larger numbers  (ie 0 at the top)
did i miss a concept in my programming.

22

General Mach Discussion / Re: still having trouble with Arc Radius and cutter radius

« on: December 30, 2006, 09:04:35 AM »

almost got it
one more problem with canned drill cycle.
I've now got this error message
" R less than Z in cycle in xy plane on line #8"
here is the actula line of code
 
N45 G81  X0.4771  Y1.1648  Z0.5000  R0.0000  F3.00

another suggestion:
insteead of quoting the actual line number it would be nice to know the "N line number" (N55)
might help on larger programs.


as always thanks for being so patient with all us newbee's

23

General Mach Discussion / Re: still having trouble with Arc Radius and cutter radius

« on: December 30, 2006, 08:59:12 AM »

sorry file did not post

24

General Mach Discussion / Re: still having trouble with Arc Radius and cutter radius

« on: December 30, 2006, 08:38:38 AM »

ok - I found the problem.  LC did not put the g41 /g42 into the Gcode file.
i don't know why but downloaded the new stuff this morning, rebuilt the part and it runs fine.

I've included the old gcode if your interested.
as you can see tools changes are in there just no offfset calls

25

General Mach Discussion / Re: still having trouble with Arc Radius and cutter radius

« on: December 30, 2006, 07:57:47 AM »

Brian - I already had tool numbers and diameters loaded into the setting page.
when i run the program, tooling data appears correctly (number and dia) on the "program run" screen.
they also update correctly at tool changes.

that the problem - it should have worked 

26

General Mach Discussion / Re: parts?

« on: December 29, 2006, 02:53:42 PM »

yes in full step the driver only turns on one coil poll causing the rotor to align dead on that poll (one full step between polls).
in half step the driver can turns on two coils at a time which would allow the poll to align midway between two coils (HALF way between). Microstepping is a subset of that.  Instead of turning on two coils with equal force it might turn n one coil at 25% power and the next at 75% power causing the poll to align off center of the half step position.(even better resolution.

Thats a simple explanation but you get the idea.  there is a point of diminishing returns (system friction may be too much to overcome on the smallest increment).

Basic engineering principle - everything is a tradeoff - you just gotta decide what to trade..

27

General Mach Discussion / Re: parts?

« on: December 29, 2006, 01:11:35 PM »

if i read this right, the table has a worm drive with 4 degrees to one revolution of the input, assuming 200 steps per rev thats a resolution of just over one arc minute or 50 steps per degree (full step). if your drivers do 1/2 step that 100 steps per degree.  i think thats about the small same as the sherline rotary table. just a guess but i.d say direct drive cause the slop in a belt system is more that your reaolution.

does that make since

28

General Mach Discussion / still having trouble with Arc Radius and cutter radius

« on: December 29, 2006, 10:45:34 AM »

this is a rework of the post "Arc Radius and cutter radius" from about a week ago

LC - 2.0.31
Mach3 2.0.29

I need some help.  I seem to be the only one have this problems cause no one else jumped on my original post..

I had some time to work on my project this morning. I loaded up my files and started running a simulation before cutting.   I cannot get tool compensation to work.( the cutter appears over the part outline)  While watching the run on the “program run “ screen,  the tool data shows the correct tool number and assigned diameters after each tool change.  I’ve reloaded  (same ver.) Mach 3 this morning but the problem does not go away. 

I had this poroblem in my original post but is disappeared

Any suggestions – it’s gotta be something I’m not doing right.

Lazycam suggestion.
When I repeated the simulation a second time I was left with the last tool change I made in the last run.  You might want to add a tools change at the beginning of the g-code program  (first cut) to insure the correct starting tool is loaded.

This would not let me post my dxf and gcode files (said they had already been uploaded once and kicked out the post).  See Arc Radius and cutter radius if interested.

29

General Mach Discussion / Re: Arc Radius and cutter radius

« on: December 23, 2006, 09:55:57 AM »

Thanks Brian - My assumption is Mach3 would just cut make a square move if they were the same but wouldn't changing tool #2 from .125 to .120 have addressed that problem.

30

General Mach Discussion / Arc Radius and cutter radius

« on: December 23, 2006, 08:54:21 AM »

I'm not really sure if this is related to LC, Gcode or Mach3 so i'm starting here.
I'm trying to cut an inside pocket.  Autocad readuis is set for .0625, Cutter tool diameter is .125" (tool #2).
When i get to the first inside corner (around n265) i get the following errror and cannot proced.
"tool raduius not less that acr radius with como on line number......"

I've tried setting the tool diameter to .120" but i still get the error.
do i have to reload from LC when i chage the tool size on the fly.

attached are the two files can someone tell me what i'm doing wrong.

Also I cannot really read the entire message, the line number is cut off.
suggest that you replace "less than" with "<" and "number" with "#"  in that message to complete display in the space given.

As always folks thanks in advance