IHS sensing with laser sensor

Himarc3D wrote:

Very expensive, no dobut i just showed it because i think they blow air to keep clean
I dont think they clean it often.
You guys already have compressors but like Mike told this have a cost.

I feel like I remember reading something from Jim Colt about machines using air directly from the torch to blow surfaces dry/clean before ohmic sensing when using a water table...

The water i think is the most difficult thing to pass. The hard stuff is to make one algorithm (its beyond my mind).Sensors, camera for harsh environment already have in market.
Yes, I believe its possible to use couple arduino and LCNC but I dont have the knowledge to code that.
Here is one example for use camera and laser to detect arc, at pag 3 some camera models but all in japanese.
If you dig for papers i think you find many ideas for you.

www.jstage.jst.go.jp/article/qjjws1943/70/7/70_7_674/_pdf


www.nipponsteel.com/tech/report/sm/pdf/1a138001.pdf

At pag 2 in the image is talking about the laser and camera angle, probabily you find this stuff in english.
www.jstage.jst.go.jp/article/qjjws1943/70/7/70_7_674/_pdf

Sensors can be mounted like this.

To make sensing fast offset should be minimum and in one direction only x or y.

protective cover open


cover closed


opening and closing of the lid can be made pretty fast.

sensor mounted at the bottom can be protecting from dross easliy.

I want to clarify, this is only for IHS. still Voltage THC will be needed.l

i will make ur life easier,,
u can use 2 encoder input
one for real THC other for capacitacne... normally the capacitance is accurate,, but not very accurate. but for probing its very fast compare to proximity or mechanical switch
even proximity sensor have lag/ (and or motor deacceleration speed... so
ur idea is gr8
solving 2 main issue,, with current system
1st u sense the sheet so u have time to stop the motor. unlike the tip complete touch
2nd u reduce the probing time, and u can protect the torch better as it will retract if its about to hit something

for design u can use my code its works well
and for circuit u need resistors. 2m ohm to 4m ohm depend of the destance of detection u want
and for antenna u need the tip to be 1 pole and the machine is the other
u can use mechanical relay to disconnect the tip while ark is on

in my qtpy i have the feature virtual float switch based on encoder value..

its OVERKILL as float switch even if its dirty

and while machine is rrepositiong .. it will trigger estop if value reach,, ur specifc value ,,,
so very good idea

taloot wrote:

i will make ur life easier,,
u can use 2 encoder input
one for real THC other for capacitacne... normally the capacitance is accurate,, but not very accurate. but for probing its very fast compare to proximity or mechanical switch
even proximity sensor have lag/ (and or motor deacceleration speed... so
ur idea is gr8
solving 2 main issue,, with current system
1st u sense the sheet so u have time to stop the motor. unlike the tip complete touch
2nd u reduce the probing time, and u can protect the torch better as it will retract if its about to hit something

for design u can use my code its works well
and for circuit u need resistors. 2m ohm to 4m ohm depend of the destance of detection u want
and for antenna u need the tip to be 1 pole and the machine is the other
u can use mechanical relay to disconnect the tip while ark is on

in my qtpy i have the feature virtual float switch based on encoder value..

its OVERKILL as float switch even if its dirty

and while machine is rrepositiong .. it will trigger estop if value reach,, ur specifc value ,,,
so very good idea

thankyou taloot.

Now I am going to use laser sensor for two reeasons,
1) those are accurate, IMHO atleast for IHS.
2) we dont have to move z axis for probe.

steps:
z moves rest height
offset applies and sensor comes at plasma position,
lid opens, sensor takes reading, close the lid
offset removes and plasma torch comes at its postion
reading is sent to plasmac

it calculates current work position, applies pierce height
torch starts cutting

I know, not for sure, this is less than 2 second process.

pinder wrote:

taloot wrote:

i will make ur life easier,,
u can use 2 encoder input
one for real THC other for capacitacne... normally the capacitance is accurate,, but not very accurate. but for probing its very fast compare to proximity or mechanical switch
even proximity sensor have lag/ (and or motor deacceleration speed... so
ur idea is gr8
solving 2 main issue,, with current system
1st u sense the sheet so u have time to stop the motor. unlike the tip complete touch
2nd u reduce the probing time, and u can protect the torch better as it will retract if its about to hit something

for design u can use my code its works well
and for circuit u need resistors. 2m ohm to 4m ohm depend of the destance of detection u want
and for antenna u need the tip to be 1 pole and the machine is the other
u can use mechanical relay to disconnect the tip while ark is on

in my qtpy i have the feature virtual float switch based on encoder value..

its OVERKILL as float switch even if its dirty

and while machine is rrepositiong .. it will trigger estop if value reach,, ur specifc value ,,,
so very good idea

thankyou taloot.

Now I am going to use laser sensor for two reeasons,
1) those are accurate, IMHO atleast for IHS.
2) we dont have to move z axis for probe.

steps:
z moves rest height
offset applies and sensor comes at plasma position,
lid opens, sensor takes reading, close the lid
offset removes and plasma torch comes at its postion
reading is sent to plasmac

it calculates current work position, applies pierce height
torch starts cutting

I know, not for sure, this is less than 2 second process.

u dont need all this hassle,,
u can use ohmic connector, on the torch tip... no need for all this,,

and u can do all of this in plasmac... i make it the same way in my laser
but in plasma u have to use 2 encoder one for float and one for thc voltage,,,
u dont need all this mechanical things,, u add,
if u have extra power,, invest ur time in laser head cleaning and nozzle changing,,,, it worth ur efforts...
and i will be ur 1st client

taloot wrote:

u dont need all this hassle,,
u can use ohmic connector, on the torch tip... no need for all this,,

you are suggesting to use torch tip to use as capacitive sensor?
I will try that.

taloot wrote:

if u have extra power,, invest ur time in laser head cleaning and nozzle changing,,,, it worth ur efforts...
and i will be ur 1st client

Haha
Sure, This will be like ATC in milling machines.
Cleaning can be done en route to tool change.

Cheers,
Pinder

Taloot is in another level with your toys hahaha, i dont have idea really.