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Messages - electrosteam

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CamBam help (General usage) / Re: Duplicate Co-ordinates after G2
« on: July 30, 2021, 23:57:55 pm »
Eddy, you are onto it, thanks.

I use LibreCad, and on close examination, I find that the tangent into the curve misses by about 1/10 micron (0.0001 mm), and goes past by about 3 microns.
I will investigate this further.
Many drawings have been done in the past trouble free, I suspect too many copies and mirrors when I did the drawing.
Goes to show that joining related elements into a 'Block" before multiple copy/paste/mirror etc would be worthwhile.

The "EDIT-JOIN" selection in Cambam was set at 0.01 to make the polyline.
This shows that CB cannot correct for sloppy drawings !

Today's task is to redraw the shape and then re-program in CamBam to confirm that was the problem.

The shape was a pocket in 12 mm steel.
I had drilled out most of the interior and my interest lay in learning about G42 and its ability to step sideways to the final desired line.
So I guess "perimeter" would be a closer description.
But it really is a profiling operation to an existing (very rough) pocket.
My "instruction" to CB was only to mean my selection of the options and parameters.

My work flow was to set G42 in LinuxCNC with a Tool Table entry of 11.9 mm (corner curves are Radius 6 mm), but load a 8 mm cutter.
The go round the (drilled) pocket observing the cut, theoretically (11.9-8)/2 = 1.95 mm clear of the final line.
Then progressively reset the Tool Table entry to 11.5, 11, 10.5, 10, 9.5, 9, 8.5, 8.2, 8.
Perhaps too conservative, but it worked a treat.

Keep well,
John.

2
CamBam help (General usage) / Duplicate Co-ordinates after G2
« on: July 30, 2021, 00:23:37 am »
I have been experimenting with G42, cutter compensation, to establish the cut on my mill.

I instructed CB to generate code for the profile of a pocket with Tool Diameter = 0.

When I tried to run the code on LinuxCNC with the tool diameter set in the Tool Table, I got error messages and the code would not run.
Inspected the code and discovered that a number of G2 moves had the target co-ord repeated on the next line with a G1.

Generally, the repeated c-ords were slightly different, more or less digits of precision and roundings, all trivial differences.
Removed all the duplicated lines and the code ran fine.

I know that LinuxCNC calculates line-by-line the tool path using simple mathematics to allow for tool diameter.

Previous efforts along the same lines did not suffer the duplicates.
I assume LinuxCNC saw the trivial differences as intended tool movements and the tool path mathematics failed,

Can anyone shed any light on what I did in CB to initiate these duplicates ?

Keep well,
John (in Lockdown Sydney).


3
Installation Help / Re: Lubuntu 21.04 - Correct Download to Install
« on: June 11, 2021, 10:08:37 am »
Progress.

Thanks EddyCurrent,
Cleaned up the previous remnants.

Then downloaded and installed 'Ubuntu 18 based Linux/Mint19 ...' as this is listed as the 64 bit version, as for Lubuntu 21.04.
Just followed the instructions in the CamBam Home page.

It opens from the terminal script, but does not open from the icon in the Graphics category in the program selection dialog box.

Looks good, will test code generation tomorrow (it is evening in Sydney).

Presume the icon opening problem should not be too hard to track down and fix.

Keep well,
John.

4
Installation Help / Lubuntu 21.04 - Correct Download to Install
« on: June 10, 2021, 23:38:50 pm »
Hi,
I have trialled CB in the past on a previous computer with Lubuntu 18.04, not sure what CB download was used.
Because of problems with the Lubuntu upgrades, I am forced to run the latest rolling upgrade, currently 21.04.

I have decided to permanently install CB, but not sure what download to use.

Because of backups being used to re-populate the folder system on the new computer, I have some CB files in various locations.
Should I remove all earlier CB remnants before starting the new install ?

Keep well,
John.

5
CamBam help (General usage) / Re: Railway Wheels by New User
« on: June 19, 2020, 23:58:36 pm »
Thanks for the responses, I will access the documentation referenced.
But, good to have your assurances.
Now to get some 3D design.

CB is Version 1.0 running on Lubuntu with the generated code followed by LinuxCNC running on Debian.

Currently, I have 20 wheels at Dia 90 mm coded to use corner rounding cutters to provide pseudo 'oval' spokes.
There are clearance issues with these cutters that may not be the case with ball-nose cutters.

Keep well,
John

6
CamBam help (General usage) / Railway Wheels by New User
« on: June 16, 2020, 23:43:55 pm »
I want to make railway wheels ( 127 mm gauge loco ) about Dia 125 mm with spokes shaped to an oval cross-section.

I have a test version of CamBam running Ok, and the generated code being used on a turret mill with LinuxCNC.
My skill at 3D design is yet to be gained.

Can the full version (paid) of CamBam produce code for a ball mill from an imported STL file, or other popular 3D format ?

Great product,
Keep well,
John.




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