New design for a CNC engraver/etcher/scratcher ... ???
- tommylight
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11 Nov 2023 23:59 #285143
by tommylight
Replied by tommylight on topic New design for a CNC engraver/etcher/scratcher ... ???
No and no, there is no Z axis, there is a pressure servo.Oh, so Z axis only serves the purpose of probing the material. The rest is done via spindle output.
Again no, although this works, it causes way to much vibration due to start/stop to change spindle speed.I assume the Z output from the Gcode signal is script-converted into a S1 - S1000 signal to drive the pwm out.
Of course, see the second post.Can you post your files?
I have no idea what this is about? There is no probe and there is no flattening of granite/marble/glass material, they are flat, always.Not sure how to handle the table flattening probe.
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11 May 2024 22:49 #300409
by tommylight
Replied by tommylight on topic New design for a CNC engraver/etcher/scratcher ... ???
Added this to printables.com , finally !
www.printables.com/model/876702-diy-cnc-...ng-logos-etc-o/files
www.printables.com/model/876702-diy-cnc-...ng-logos-etc-o/files
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06 Jun 2024 06:29 #302435
by Lockwood
Replied by Lockwood on topic New design for a CNC engraver/etcher/scratcher ... ???
Fantastic design, do you have any details on the electronics and the motor used to swivel the head please and how to drive this movement? Many thanks Mike
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06 Jun 2024 20:23 - 06 Jun 2024 20:24 #302487
by tommylight
Replied by tommylight on topic New design for a CNC engraver/etcher/scratcher ... ???
I am not in the shop now, but in short, the "pressure" motor is
-a 3 phase BLDC motors with it's own electronic controller taken out of the old photocopiers,
-there are many versions and sizes of them,
-form 5 to 10 pins,
-all signaling is sinking type or "active low", meaning connect to ground to activate
-all have the pinout printed on the board,
-older ones are pure PWM while new ones require also a clock signal,
-some are single direction while some are bidirectional,
-and most of them can be easily used for this purpose/machine,
--The PWM ones require 5V, 12-24V and an inverted PWM signal
--The ones requiring clock signal have a self check feature, so mostly work with only 12-24V supply and one of the pins tied to ground, this pin will spin the motor for about 2 second and stop, and has to be disconnected and reconnected to spin again. This pin is used as inverted PWM but scaling must be set to about max 85-95% PWM to keep the controller from tripping and stopping the motor after 2 seconds.
--for inverting the PWM pin i use a single 220 OHm resistor and a single transistor, any NPN transistor works, resistor connected between base of transistor and PWM output from PC or Mesa board.
-
hackaday.io/project/5236-savin-c2020-teardown
-a 3 phase BLDC motors with it's own electronic controller taken out of the old photocopiers,
-there are many versions and sizes of them,
-form 5 to 10 pins,
-all signaling is sinking type or "active low", meaning connect to ground to activate
-all have the pinout printed on the board,
-older ones are pure PWM while new ones require also a clock signal,
-some are single direction while some are bidirectional,
-and most of them can be easily used for this purpose/machine,
--The PWM ones require 5V, 12-24V and an inverted PWM signal
--The ones requiring clock signal have a self check feature, so mostly work with only 12-24V supply and one of the pins tied to ground, this pin will spin the motor for about 2 second and stop, and has to be disconnected and reconnected to spin again. This pin is used as inverted PWM but scaling must be set to about max 85-95% PWM to keep the controller from tripping and stopping the motor after 2 seconds.
--for inverting the PWM pin i use a single 220 OHm resistor and a single transistor, any NPN transistor works, resistor connected between base of transistor and PWM output from PC or Mesa board.
-
hackaday.io/project/5236-savin-c2020-teardown
Last edit: 06 Jun 2024 20:24 by tommylight. Reason: more info
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