Messages

7071

Show"N"Tell ( Your Machines) / Re: The Laser Project.

« on: March 26, 2011, 01:23:13 PM »

Hi Pete,

She is Lena Soderberg and her picture featured in a Playboy mag of 1972 when she was in her early twenties. The pic itself went on to be used as a standard for digital image processing and the very first .jpg compression trials. The pic in it's entirety is truly beautiful and well worth doing a Google search to find.

Thanks for the encouragement, I just keep learning as I go.

Tweakie.

7072

General Mach Discussion / Re: help please

« on: March 26, 2011, 03:03:33 AM »

Hi,

Not sure exactly what the pitch (turns per inch) is for your leadscrews but Al Lenz made a nice calculator which you can download from here http://www.machsupport.com/forum/index.php/topic,16315.msg110286.html#msg110286

Tweakie.

7073

General Mach Discussion / Re: Ordered 3 Dugong drives for my Hurco

« on: March 25, 2011, 10:14:26 AM »

Looking forward to following the thread and seeing the pictures. 

Tweakie.

7074

General Mach Discussion / Re: mad noise and vibrations at slow speed

« on: March 25, 2011, 09:48:11 AM »

Hi Calv,

Microstepping is the way to go 

Tweakie.

7075

General Mach Discussion / Re: mad noise and vibrations at slow speed

« on: March 25, 2011, 02:30:06 AM »

Calv,

In an X,Y move where one axis has farther to go than the other they both start and finish at the same time - one axis moves continuously and smoothly whilst the other starts and stops in jerks. This is why I said that reducing the acceleration would smooth the jerky movement and show some improvement in the situation.
(My router stands on castors and if I have the accel. set too high the whole thing starts to rock  )

Tweakie.

7076

General Mach Discussion / Re: Is is possible that some motherboard does not work with Mach3

« on: March 24, 2011, 12:18:32 PM »

I did place another VFD I had on hand on the back of the Z axis rather than in the control panel

Now they're no more interference to the computer.

Looks like you have solved the problem then.

Tweakie.

7077

Show"N"Tell ( Your Machines) / Re: The Laser Project.

« on: March 24, 2011, 09:45:51 AM »

At last I think I have finally been able to produce a raster image without any horizontal banding. It is early days yet so I must not be too complacent but I have now made some 5 or 6 of these same images of young Lena (top part of photo only - this is a family forum  ) all different sizes and without any banding at all. Like many problems it appears that there was more than one component to this problem.

Tweakie.

7078

Mach SDK plugin questions and answers. / Re: Impact engraving plugin

« on: March 24, 2011, 09:17:43 AM »

An image, done this morning, shows horizontal banding (perhaps difficult to see in the photo, but it's there) the banding is related to the image DPI and the image size. An increase in axis speed would make no difference to the dot positions although they would, of course, be placed at a faster rate (within the limitations of the laser operating system). The pulse repetition rate (PRF) must therefore increase with speed. As axis speed is increased there will come a point when the pulse width (PWM) is wider than the gap between successive pulses and no image can be produced. Perhaps not attainable with a moving axis but easily done with a scanner head. There must be an optimum axis speed but I think you are nearer to finding it than I.

Tweakie.

7079

General Mach Discussion / Re: Zeroing with movement?

« on: March 24, 2011, 08:29:33 AM »

think there must still be a gremlin somewhere as I can highlight and zero an individual axis ok using the keyboard but when I use the onscreen button to zero that axis it does not zero but runs away until stopped by the limit switch??

This could be attributed to your modified screenset. If the individual axis zero buttons can be accessed by the 'edit button script' (as you did for the zero all button) then their contents can be changed easily - if this is not he case then the only way to change the contents would be to use one of the screen editors. This is not difficult to do, bit of learning required but may solve this problem.

Tweakie.

nb. My post #2 is totally irrelevant to this thread, just how it got here is anybody's guess.

7080

Mach SDK plugin questions and answers. / Re: Impact engraving plugin

« on: March 24, 2011, 08:08:34 AM »

Hi Stitos,

I am sorry buddy but I just do not know all the answers, wish I did 

I run my X Axis at 3500mm/min and I am getting quite good results at this speed. If you will get any improvement at 5000mm/min I really don't know but I would be very interested to hear of your results and perhaps see some pictures of your work.
The pulse rate may be fixed to the image D.P.I. in which case it will vary with speed.

I think I have finally got to the bottom of the 'banding' issue I have been having but it is too early to be sure, lots more testing first 

Tweakie.