New design for a CNC engraver/etcher/scratcher ... ???

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27 Aug 2022 20:47 #250595 by tommylight
What the tiiiiiit is this thing supposed to be named?
I am going with "scratcher" from now on, all it does is scratch the surface of granite or stone or glass or wood or...
So, i thought it would be nice to do a new design for these machines i keep making from time to time and since i had to learn FreeCAD again, i gave it a go, so here are the results of the Version 1 :



and Version 2 :


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27 Aug 2022 21:05 - 12 Nov 2023 00:04 #250596 by tommylight
For more info and videos
instagram @toma.3d and @toma.cnc
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Attached is the full set of STL files in case anyone wants to build one, one part is compressed using 7Z and renamed to be able to upload, so remove ".txt" before unzipping it.
Edit:
Added the latest config as it has provisions for disabling PWM on ESC/Stop to prevent spindle from making a big hole on the material. Also "run from here" should work as is.
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Last edit: 12 Nov 2023 00:04 by tommylight. Reason: more info.
The following user(s) said Thank You: phillc54, Clive S, snowgoer540

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28 Aug 2022 01:51 #250599 by phillc54
That is cool Tommy, I like "scratcher".
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01 Sep 2022 21:58 #250950 by tommylight
Here is a quick picture of the current state of "The Scratcher" as i got the frames back fro m painting yesterday so been busy putting it together.
Also printing parts for the second one in yellow PETG. :)
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06 Sep 2022 22:46 #251362 by tommylight
One done:


The other getting the spaghetti treatment or wiring:
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20 Sep 2022 00:20 #252372 by tommylight



Also finished this working occasionally on it

It has 4 motors on the Z axis so it probes 4 corners and adjusts each corner to make the table flat.

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28 Mar 2023 20:06 - 28 Mar 2023 20:08 #267727 by tommylight
Another video
youtube.com/shorts/mPyvLKJxuzI?feature=share
STL files are attached near the top, if anyone wants to build one.
Last edit: 28 Mar 2023 20:08 by tommylight. Reason: added link
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11 Nov 2023 16:49 #285113 by santy
Hey Tommy. I'm looking for some information on this post to help a friend build a similar machine.
I'm trying to understand the used mechanism to allow for harder/softer engraving. Are you using a faster motor speed for the darker areas? Or pressing harder with a Z axis movement? This is my main question in the proccess.

I managed to install dmap2gcode which is really helpful here!

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11 Nov 2023 22:00 #285136 by tommylight

Or pressing harder with a Z axis movement?

This.
The spindle and spindle motor are attached to the shaft of a 3 phase sensored servo motor from big photocopiers, they need 12-24V to work and a inverted PWM output from parallel port or Mesa board. Inverting is done using a single resistor and a transistor.
Inverting can be done by inverting the pin in hal, but that has the nasty habit of ramming the spindle in the table until LinuxCNC is started.
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11 Nov 2023 23:51 #285142 by santy
Oh, so Z axis only serves the purpose of probing the material. The rest is done via spindle output.

I assume the Z output from the Gcode signal is script-converted into a S1 - S1000 signal to drive the pwm out.

Can you post your files? Not sure how to handle the table flattening probe.

Thank you in advance.

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