CNC plasma cutter build

DavidR8

Soaking up knowledge!
H-M Platinum Supporter
Joined
Oct 16, 2019
Messages
4,502
Excellent project.

The cutter is starting and running OK without an active Z axis height control, yes?

There seems to be some error between when the cutter is moving away from the camera vs toward camera. I noticed what looks like (nearest the camera) a flat (cord) on the round hole and the two short segments of the square don't converge. Are those intended or mechanical backlash or software tuning? My question is, if those observances aren't intended, where do you expect to implement the fix?
It's a blowback start torch so as soon as I pull the trigger/activate the torch it fires, even if it's inches away from the stock.

I'm not sure what happened on that square as I re-ran the file and it cut just fine. I have a hunch something got hung up and caused it to skip a tooth on the x-axis gear rack.
@extropic I figured out the problem. The torch cable moved the sheet slightly as the X-axis moved toward the camera.
Starts at :07s in the video. You can see the edge of the sheet move about an 1/8"+.
 
Last edited:

jwmelvin

H-M Supporter - Gold Member
H-M Supporter Gold Member
Joined
Jan 11, 2018
Messages
586
Lol, I can imagine your reaction. Nice work on the table; it looks like fun.
 

DavidR8

Soaking up knowledge!
H-M Platinum Supporter
Joined
Oct 16, 2019
Messages
4,502
Used my metal shear to cut strips for the water tray. Not perfect as I need to add a couple at the near end.
I was going to use the plasma cutter to cut them but the torch switch is wired to the black box.
I have some new connectors coming so I can also use it as a handheld torch.
bdd8ce85d13a90d40c83214aa02f659b.jpg
 

BGHansen

H-M Supporter - Sustaining Member
H-M Platinum Supporter
Joined
Nov 23, 2014
Messages
1,959
Just curious how the water tray works in use. I have a cheap inverter plasma cutter and recall cutting 1/8" steel using whatever current and air at 30-40 psi. Does the air tend to blow the water out of the tray? Seems like all nice tables have them, the design must be sound.

Bruce
 

DavidR8

Soaking up knowledge!
H-M Platinum Supporter
Joined
Oct 16, 2019
Messages
4,502
Just curious how the water tray works in use. I have a cheap inverter plasma cutter and recall cutting 1/8" steel using whatever current and air at 30-40 psi. Does the air tend to blow the water out of the tray? Seems like all nice tables have them, the design must be sound.

Bruce

It serves a couple of purposes: the water absorbs the sparks that blow out the bottom of the cut and the water helps cool the metal.
 

koenbro

H-M Supporter - Gold Member
H-M Supporter Gold Member
Joined
Feb 23, 2016
Messages
109
Just curious how the water tray works in use. I have a cheap inverter plasma cutter and recall cutting 1/8" steel using whatever current and air at 30-40 psi. Does the air tend to blow the water out of the tray? Seems like all nice tables have them, the design must be sound.

Bruce

The water bubbles and cools the metal, traps the smoke and does not splash out except when cutting at the very edge of the tray. Evaporation is a bigger concern, I drain mine into a drum (with a lid) at the end of a day and use a small pump to refill in the morning.


Sent from my iPhone using Tapatalk Pro
 

Boswell

Hobby Machinist since 2010
H-M Lifetime Diamond Member
Joined
Feb 27, 2014
Messages
1,360
I have seen video's where the water level is raised under CNC control so that the metal to be cut is touching the water. even seeing wetness on top of the target metal. This does not seem to interfere with the cutting.
 

Tmate

H-M Supporter - Diamond Member
H-M Lifetime Diamond Member
Joined
Jul 15, 2020
Messages
296
Another consideration is selecting a space for your small CNC plasma table is the tremendous mess it creates. Plasma dust goes everywhere and settles on everything, not to mention in your lungs. Sparks fly everywhere, and debris falls out the bottom. Water tables help reduce plasma dust, but create a mess of their own.

The solution that I have used over the years can be found here: https://www.hobby-machinist.com/threads/cnc-plasma-cutting-when-you-have-no-space.85935/
 
It can take up to an hour for ads to appear on the page. See our code implementation guide for more details. If you already have Auto ad code on your pages there's no need to replace it with this code
Top
AdBlock Detected

We get it, advertisements are annoying!

Sure, ad-blocking software does a great job at blocking ads, but it also blocks useful features of our website. For the best site experience please disable your AdBlocker.

I've Disabled AdBlock