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21  Mach Discussion / Mach4 General Discussion / Re: Mach4 Screw Error Mapping on: June 07, 2017, 09:03:39 AM
Never eventually did it. Was just a thought. I think it would depend on what you've got for a controller (defines the signal width) and what is the max step pulse frequency. Modern PLCs can have scan times in the range of 0.1mS. My feeling is it could be not enough if you have high frequency step signal. But you could do simple math calculation to determine.

Another option could be an Arduino type microcontroller, which has much faster processors. The fastest I have seen from Arduino is 84Mhz. I think it should easily accomplish the task if you program it correctly.

Dan
22  Mach Discussion / Mach SDK plugin questions and answers. / Re: Impact engraving plugin on: May 18, 2017, 07:23:21 AM
Replaced the simple transistor-based circuit with a stepper driver to drive the solenoid, and now I can get much higher frequencies. Now 50Hz is not a problem and even can be pushed up to 80Hz.

Facing 2 problems:
1. The solenoid is connected to only one phase of the driver, so I am getting only HALF the frequency (the driver is set to FULL step). If 200 pulses are sent, the solenoid only does 100 strokes.
2. The plunger idle state position is random. After a pulse train the plunger sometimes stops inside the coil, while sometimes outside. This is a big problem, since it ruins the work when the plunger sticks outside while idle and being dragged on the work.

I think the 2 problem are related.

How did you overcome these issues? Did you have them at all?

Thanks,
Dan
23  General CNC Chat / Show"N"Tell ( Your Machines) / Re: The Laser Project. on: April 17, 2017, 12:22:33 PM
Did you try to download and install it? I think it will allow you to play with it without a licence, but will put watermarks on your image.

Dan
24  General CNC Chat / Show"N"Tell ( Your Machines) / Re: The Laser Project. on: April 17, 2017, 05:39:45 AM
OK, thanks Tweakie. Would be interesting to see if you find it.

Dan
25  General CNC Chat / Show"N"Tell ( Your Machines) / Re: The Laser Project. on: April 17, 2017, 04:49:08 AM
Hi Tweakie,

From the link you referred to above:
http://hobbycncart.com/forum/63-151-1

Your post #2 you mention a video with a constant 50Hz engraver. What video are you talking about? Do you have a link? Is it a CNC with constant frequency engraver? What would the Gcode look like?

Dan
26  General CNC Chat / Show"N"Tell ( Your Machines) / Re: The Laser Project. on: April 13, 2017, 04:10:14 AM
Hi Nikolaj,

Did you check PicEngrave at www.picengrave.com ?
It may do what you want. It does have the option of variable feedrate, but not sure about the M10/M11. Haven't used it for a long time, but I am sure Tweakie will soon chime in and give you a better reply.

Dan
27  General CNC Chat / Show"N"Tell ( Your Machines) / Re: The Laser Project. on: April 12, 2017, 04:34:44 AM
Thanks Tweakie!

Dan
28  General CNC Chat / Show"N"Tell ( Your Machines) / Re: The Laser Project. on: April 12, 2017, 02:45:47 AM
Thanks Tweakie!

Got a link to his work with the encoder?

Dan
29  General CNC Chat / Show"N"Tell ( Your Machines) / Re: The Laser Project. on: April 12, 2017, 01:34:05 AM
Hi Tweakie,
I think it was here that I saw someone who used the Z motor coupled to an encoder to do analogue control of a laser power. Wanted to review his work and try to implement this idea for impact engraving. Do you remember who it was and do you have some reference?

Dan
30  Mach Discussion / Mach SDK plugin questions and answers. / Re: Impact engraving plugin on: March 12, 2017, 01:32:43 PM
Does anyone have any idea how Roland make their impact heads?
https://www.youtube.com/watch?v=zvXmtWM5ZCM

They work extremely fast and from the specs it appears the plunger moves at about 700Hz (353 dpi resolution at 2in/min engraving speed):
https://www.rolanddga.com/products/engraving-machines/mpx-95-impact-printer/specifications

Do they utilize a very small solenoid and a very small stroke and low power? I would like to try and build a head that would be that fast.

There are also these handheld machines, which are much faster:
http://www.eliseservices.co.uk/p/apollo-13w-7200-stroke-per-minute-electric-engraver-5-piece-mixed-accessory-kit-including-letter-number-shape-template-stencils/

Dan
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