Sensing Distance from Work Piece - Revision history

Marcin at 07:36, 20 April 2017

2017-04-20T07:36:22Z

← Older revision		Revision as of 07:36, 20 April 2017
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	*integrate with [[CNC_Torch_Table_Control_Overview#grbl\|torch table grbl]]		*integrate with [[CNC_Torch_Table_Control_Overview#grbl\|torch table grbl]]

	~~= Router =~~		[[Category:CNC Torch Table]]

Marcin: /* Other torch height sensor ideas */

2016-08-24T04:35:01Z

Other torch height sensor ideas

← Older revision		Revision as of 04:35, 24 August 2016
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	*[[http://www.acroname.com/robotics/info/articles/sharp/sharp.html Sharp]] photoelectric rangers might work for initial height sensing; presumably would be blinded during actual cutting.		*[[http://www.acroname.com/robotics/info/articles/sharp/sharp.html Sharp]] photoelectric rangers might work for initial height sensing; presumably would be blinded during actual cutting.
	*'''ultrasonic distance sensing''': if mounted some distance from the torch, an [http://arduino.cc/en/Tutorial/Ping?from=Tutorial.UltrasoundSensor ultrasonic sensor controlled by an arduino] running the z-axis motor might be a low-cost way to control torch height. One might provide an input signal from the CNC-controlling computer (or cheat, and use a photocell aimed at torch location) to set pierce height differently than ongoing cut height.		*'''ultrasonic distance sensing''': if mounted some distance from the torch, an [http://arduino.cc/en/Tutorial/Ping?from=Tutorial.UltrasoundSensor ultrasonic sensor controlled by an arduino] running the z-axis motor might be a low-cost way to control torch height. One might provide an input signal from the CNC-controlling computer (or cheat, and use a photocell aimed at torch location) to set pierce height differently than ongoing cut height.
	** From [~~http~~://www.parallax.com/~~Portals/0/Downloads/docs/prod/acc~~/28015~~-PING-v1.6.pdf~~ the PING sensor datasheet]:		** From [https://www.parallax.com/product/28015 the PING sensor datasheet]:
	***For accuracy, temperature compensation should occur.		***For accuracy, temperature compensation should occur.
	***Maximum operating temperature of 70C.		***Maximum operating temperature of 70C.

ChuckH: /* Plasma Torch */

2013-08-13T04:08:02Z

Plasma Torch

← Older revision		Revision as of 04:08, 13 August 2013
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	::[http://www.cnccontrols.com/thcontrol.asp\| CamSoft Torch Height Controller]		::[http://www.cnccontrols.com/thcontrol.asp\| CamSoft Torch Height Controller]
	::[http://www.hypertherm.com/en/Products/Controls_for_Automation/Torch_Height_Controls/sensor_thc.jsp\| Hypertherm Torch Height Controller]		::[http://www.hypertherm.com/en/Products/Controls_for_Automation/Torch_Height_Controls/sensor_thc.jsp\| Hypertherm Torch Height Controller]
			::[http://burnykaliburn.com/uploads/BurnyKaliburn_PDFs/BurnyPDF/torch-height-control-system-smarthc.pdf\| Lincoln/Burny Torch Height Controller]

	== Oxyfuel Torch Technology ==		== Oxyfuel Torch Technology ==

ChuckH at 03:54, 13 August 2013

2013-08-13T03:54:55Z

← Older revision		Revision as of 03:54, 13 August 2013
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	= Torch cutting =		= Torch cutting =
	See also [[Paul_Log#Tue_Jul_30.2C_2013\|Paul Log capacitance sensor]]		See also [[Paul_Log#Tue_Jul_30.2C_2013\|Paul Log capacitance sensor]]

			See also [[Height_Controller]]

	== Plasma Torch ==		== Plasma Torch ==

	See also [[Justin_Log#Wed_jul_17_2013\|Justin log]]		See also [[Justin_Log#Wed_jul_17_2013\|Justin log]]

	~~See also [[Height_Controller]]~~

	Here is a [http://www.centricut.com/New_Lessons/lessons_10.html great article] on controlling Torch to Work Distance. The quick story is that voltage between the torch and the work piece increases as the torch gets further away from the material. There is a discussion of building a z-controller [http://www.practicalmachinist.com/vb/fabrication-cnc-laser-waterjet-plasma-welding-fab/plasma-torch-voltage-132044/ here]-- some of the content may be helpful. From that is a potential [http://www.candcnc.com/ collaborator].		Here is a [http://www.centricut.com/New_Lessons/lessons_10.html great article] on controlling Torch to Work Distance. The quick story is that voltage between the torch and the work piece increases as the torch gets further away from the material. There is a discussion of building a z-controller [http://www.practicalmachinist.com/vb/fabrication-cnc-laser-waterjet-plasma-welding-fab/plasma-torch-voltage-132044/ here]-- some of the content may be helpful. From that is a potential [http://www.candcnc.com/ collaborator].

ChuckH: /* Torch cutting */

2013-08-13T03:53:58Z

Torch cutting

← Older revision		Revision as of 03:53, 13 August 2013
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	See also [[Justin_Log#Wed_jul_17_2013\|Justin log]]		See also [[Justin_Log#Wed_jul_17_2013\|Justin log]]

			See also [[Height_Controller]]

	Here is a [http://www.centricut.com/New_Lessons/lessons_10.html great article] on controlling Torch to Work Distance. The quick story is that voltage between the torch and the work piece increases as the torch gets further away from the material. There is a discussion of building a z-controller [http://www.practicalmachinist.com/vb/fabrication-cnc-laser-waterjet-plasma-welding-fab/plasma-torch-voltage-132044/ here]-- some of the content may be helpful. From that is a potential [http://www.candcnc.com/ collaborator].		Here is a [http://www.centricut.com/New_Lessons/lessons_10.html great article] on controlling Torch to Work Distance. The quick story is that voltage between the torch and the work piece increases as the torch gets further away from the material. There is a discussion of building a z-controller [http://www.practicalmachinist.com/vb/fabrication-cnc-laser-waterjet-plasma-welding-fab/plasma-torch-voltage-132044/ here]-- some of the content may be helpful. From that is a potential [http://www.candcnc.com/ collaborator].

ChuckH: /* Torch cutting */

2013-08-11T16:25:26Z

Torch cutting

← Older revision		Revision as of 16:25, 11 August 2013
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	= Torch cutting =		= Torch cutting =
			See also [[Paul_Log#Tue_Jul_30.2C_2013\|Paul Log capacitance sensor]]
	== Plasma Torch ==		== Plasma Torch ==

ChuckH: /* Torch cutting */

2013-07-22T00:22:44Z

Torch cutting

← Older revision		Revision as of 00:22, 22 July 2013
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	= Torch cutting =		= Torch cutting =
	== Plasma Torch ==		== Plasma Torch ==

			See also [[Justin_Log#Wed_jul_17_2013\|Justin log]]

	Here is a [http://www.centricut.com/New_Lessons/lessons_10.html great article] on controlling Torch to Work Distance. The quick story is that voltage between the torch and the work piece increases as the torch gets further away from the material. There is a discussion of building a z-controller [http://www.practicalmachinist.com/vb/fabrication-cnc-laser-waterjet-plasma-welding-fab/plasma-torch-voltage-132044/ here]-- some of the content may be helpful. From that is a potential [http://www.candcnc.com/ collaborator].		Here is a [http://www.centricut.com/New_Lessons/lessons_10.html great article] on controlling Torch to Work Distance. The quick story is that voltage between the torch and the work piece increases as the torch gets further away from the material. There is a discussion of building a z-controller [http://www.practicalmachinist.com/vb/fabrication-cnc-laser-waterjet-plasma-welding-fab/plasma-torch-voltage-132044/ here]-- some of the content may be helpful. From that is a potential [http://www.candcnc.com/ collaborator].

ChuckH: /* Other torch height sensor ideas */

2013-07-22T00:15:34Z

Other torch height sensor ideas

← Older revision		Revision as of 00:15, 22 July 2013
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	*'''Capacitive sensors'''		*'''Capacitive sensors'''
	** Cypress [http://www.element14.com/community/message/76985 PSoc4 proximity demo]		** Cypress [http://www.element14.com/community/message/76985 PSoc4 proximity demo], [[PSoC Torch Height Sensing]]
	** Capacitive sensors have been [http://www.interaccess.org/blog/?p=1886 interfaced with arduinos]		** Capacitive sensors have been [http://www.interaccess.org/blog/?p=1886 interfaced with arduinos]
	*[[Jcc3inc's torch height control]] (doesn't include initial height)		*[[Jcc3inc's torch height control]] (doesn't include initial height)

ChuckH: /* Other torch height sensor ideas */

2013-07-22T00:10:47Z

Other torch height sensor ideas

← Older revision		Revision as of 00:10, 22 July 2013
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	== Other torch height sensor ideas ==		== Other torch height sensor ideas ==

			*'''Capacitive sensors'''
			** Cypress [http://www.element14.com/community/message/76985 PSoc4 proximity demo]
			** Capacitive sensors have been [http://www.interaccess.org/blog/?p=1886 interfaced with arduinos]
	*[[Jcc3inc's torch height control]] (doesn't include initial height)		*[[Jcc3inc's torch height control]] (doesn't include initial height)
	*[[http://www.acroname.com/robotics/info/articles/sharp/sharp.html Sharp]] photoelectric rangers might work for initial height sensing; presumably would be blinded during actual cutting.		*[[http://www.acroname.com/robotics/info/articles/sharp/sharp.html Sharp]] photoelectric rangers might work for initial height sensing; presumably would be blinded during actual cutting.
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	**[[https://www.adafruit.com/products/984 Maxbotix]] ultrasound sensor		**[[https://www.adafruit.com/products/984 Maxbotix]] ultrasound sensor
	**See also [[Ultrasound_Torch_Height_Controller]]		**See also [[Ultrasound_Torch_Height_Controller]]
	*'''Capacitive sensors'''
	** Cypress [http://www.element14.com/community/message/76985 PSoc4 proximity demo]
	** Capacitive sensors have been [http://www.interaccess.org/blog/?p=1886 interfaced with arduinos]
	*[http://www.ifm.com/ifmus/web/dsfs!KI5030.html industrial-grade, extreme environment capacitive sensors] are also available		*[http://www.ifm.com/ifmus/web/dsfs!KI5030.html industrial-grade, extreme environment capacitive sensors] are also available
	*[http://www.tigoe.net/pcomp/code/circuits/motors/stepper-motors stepper motor control with an arduino]		*[http://www.tigoe.net/pcomp/code/circuits/motors/stepper-motors stepper motor control with an arduino]
	*[http://itp.nyu.edu/physcomp/Labs/Servo servo motor control with an arduino]		*[http://itp.nyu.edu/physcomp/Labs/Servo servo motor control with an arduino]
	*integrate with [[CNC_Torch_Table_Control_Overview#grbl\|torch table grbl]]		*integrate with [[CNC_Torch_Table_Control_Overview#grbl\|torch table grbl]]


	= Router =		= Router =

ChuckH at 00:07, 22 July 2013

2013-07-22T00:07:57Z

← Older revision		Revision as of 00:07, 22 July 2013
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	'''[[Ultrasound_Torch_Height_Controller\|Ultrasound ranging]]''' may provide general-purpose sensing, independent of the specific tool type.		'''[[Ultrasound_Torch_Height_Controller\|Ultrasound ranging]]''' may provide general-purpose sensing, independent of the specific tool type.

	= Plasma Torch =		= Torch cutting =
			== Plasma Torch ==

	Here is a [http://www.centricut.com/New_Lessons/lessons_10.html great article] on controlling Torch to Work Distance. The quick story is that voltage between the torch and the work piece increases as the torch gets further away from the material. There is a discussion of building a z-controller [http://www.practicalmachinist.com/vb/fabrication-cnc-laser-waterjet-plasma-welding-fab/plasma-torch-voltage-132044/ here]-- some of the content may be helpful. From that is a potential [http://www.candcnc.com/ collaborator].		Here is a [http://www.centricut.com/New_Lessons/lessons_10.html great article] on controlling Torch to Work Distance. The quick story is that voltage between the torch and the work piece increases as the torch gets further away from the material. There is a discussion of building a z-controller [http://www.practicalmachinist.com/vb/fabrication-cnc-laser-waterjet-plasma-welding-fab/plasma-torch-voltage-132044/ here]-- some of the content may be helpful. From that is a potential [http://www.candcnc.com/ collaborator].
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	Experimental observation (ChuckH): The Torchmate cutter sets initial height by using the (DC-servo-driven) z axis to drive the torch into contact with the work and stalling (exceeding a torque/current sensing threshold), then retracting to pierce height. If the workpiece is bowed up or not fully supported, it deflects downward during the height detection and springs back up as the torch retracts; this situation results in the torch starting too close to the work. A lower-force or non-contact initial height sensor would avoid this problem.		Experimental observation (ChuckH): The Torchmate cutter sets initial height by using the (DC-servo-driven) z axis to drive the torch into contact with the work and stalling (exceeding a torque/current sensing threshold), then retracting to pierce height. If the workpiece is bowed up or not fully supported, it deflects downward during the height detection and springs back up as the torch retracts; this situation results in the torch starting too close to the work. A lower-force or non-contact initial height sensor would avoid this problem.

	~~= Acetylene Torch =~~		There is a lot of information about torch tables using plasma torches, less about those using acetylene torches.

	~~= Router =~~


	~~= Notes from Tom =~~

	~~== Plasma Technology ==~~
	There is a lot of information about torch tables using plasma torches, ~~but I haven't seen much~~ about those using acetylene torches.

	The articles about plasma torches seem consistent:		The articles about plasma torches seem consistent:
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	::[http://www.hypertherm.com/en/Products/Controls_for_Automation/Torch_Height_Controls/sensor_thc.jsp\| Hypertherm Torch Height Controller]		::[http://www.hypertherm.com/en/Products/Controls_for_Automation/Torch_Height_Controls/sensor_thc.jsp\| Hypertherm Torch Height Controller]

	== ~~Oxy~~ Torch Technology ==		== Oxyfuel Torch Technology ==

	Torch tables using flame technology abound as well. They are called "Oxygen Fuel" tables, as they can use fuels other than acetylene.		Torch tables using flame technology abound as well. They are called "Oxygen Fuel" tables, as they can use fuels other than acetylene.

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	::[http://www.rutex.com/files/R982A.pdf Rutex Oxy Torch Height Control]		::[http://www.rutex.com/files/R982A.pdf Rutex Oxy Torch Height Control]

	=~~DIY, standalone~~ sensor ideas=
			== Other torch height sensor ideas ==
	*[[Jcc3inc's torch height control]] (doesn't include initial height)		*[[Jcc3inc's torch height control]] (doesn't include initial height)
	*[[http://www.acroname.com/robotics/info/articles/sharp/sharp.html Sharp]] photoelectric rangers might work for initial height sensing; presumably would be blinded during actual cutting.		*[[http://www.acroname.com/robotics/info/articles/sharp/sharp.html Sharp]] photoelectric rangers might work for initial height sensing; presumably would be blinded during actual cutting.
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	*[http://itp.nyu.edu/physcomp/Labs/Servo servo motor control with an arduino]		*[http://itp.nyu.edu/physcomp/Labs/Servo servo motor control with an arduino]
	*integrate with [[CNC_Torch_Table_Control_Overview#grbl\|torch table grbl]]		*integrate with [[CNC_Torch_Table_Control_Overview#grbl\|torch table grbl]]


			= Router =