Search found 84 matches

by Rodw
Wed Sep 13, 2017 7:02 am
Forum: Pricing, Advertising, & Marketing Your Products Forum
Topic: Sales before and after getting a website.
Replies: 1
Views: 139

Re: Sales before and after getting a website.

I've run a small ecommerce site since 2009 and its only this year I've realised how little I knew about running one. This year I am committing close to $50k with consultants to take the business forward. I would not be doing that if I was not 100% confident that I Will get my money back in just a fe...
by Rodw
Wed Sep 06, 2017 5:22 pm
Forum: DIY Plasma Table & Accessory Discussion Forum
Topic: What can I expect from DIY plasma?
Replies: 13
Views: 322

Re: What can I expect from DIY plasma?

OT for a moment here. The tyranny of distance is the biggest impediment to doing business in AU and our location favours logistics out of Asia over the US. With the AU-US free trade agreement, there should be no duties on your products if YOU complete the paperwork correctly. The government fees the...
by Rodw
Wed Sep 06, 2017 7:50 am
Forum: DIY Plasma Table & Accessory Discussion Forum
Topic: What can I expect from DIY plasma?
Replies: 13
Views: 322

Re: What can I expect from DIY plasma?

Really? Send us some photos of M6 clearance holes you have cut with an M6 bolt as reference. Something in 3mm or thicker material. Tom, you really should read what you write before posting on a public forum. No need to be sarcastic or disrespectful. I'm no threat to your business. Just a hobbyist o...
by Rodw
Tue Sep 05, 2017 5:20 pm
Forum: DIY Plasma Table & Accessory Discussion Forum
Topic: What can I expect from DIY plasma?
Replies: 13
Views: 322

Re: What can I expect from DIY plasma?

Hi, I'm another Aussie thats just getting his DIY table cutting. It depends how much DIY you want to do but I have done the lot! Its not that difficult to build a table with tolerances in my view if you are prepared to use the right motion components. I can easily cut M6 clearance holes and think I ...
by Rodw
Sat Sep 02, 2017 5:59 pm
Forum: Everlast & Longevity Plasma Cutters
Topic: Everlast CNC Port Errata - How it really works
Replies: 9
Views: 312

Re: Everlast CNC Port Errata - How it really works

Hmm, Further testing has revealed that the Everlast manual is correct about the division ratios. They are indead 16:1 and 50:1 BUT: Many THC's must have some sort of scaling resistance internally to scale the input voltage to suit their internal ADC. They may see the Everlast division resistors as a...
by Rodw
Tue Aug 29, 2017 4:23 pm
Forum: CNC Plasma Cutters General Forum
Topic: List of available THCs?
Replies: 33
Views: 995

Re: List of available THCs?

That THCAD-10 has me interested via encoder input as that could work other CNC software and uccnc (anything that will take an encoder input really). Downloaded the linuxcnc iso but gone no further with it yet. Rodw, the branch you're using, where is it, does it have a wiki, thread link etc I can re...
by Rodw
Tue Aug 29, 2017 7:02 am
Forum: CNC Plasma Cutters General Forum
Topic: List of available THCs?
Replies: 33
Views: 995

Re: List of available THCs?

Gee, you guys have been busy since I last checked in. Even the Poms have thrown in their 2 cents worth! Great to see such a lively discussion. I had hoped to ride in triumphant with some amazing examples of Beefy's "real life tests" but my plasma failed to give me an ArcOK signal so as the...
by Rodw
Mon Aug 28, 2017 7:33 am
Forum: CNC Plasma Cutters General Forum
Topic: List of available THCs?
Replies: 33
Views: 995

Re: List of available THCs?

In my opinion, it is possible to improve the resolution of the THCAD by narrowing the voltage sensing range from say 0-10V to 0-5 or even 0-3V which with a 50:1 divider will be 0-250V or 0-150V (better) via changing the resistors and also offsetting the sensing voltage from zero volts upwards given...
by Rodw
Mon Aug 28, 2017 6:48 am
Forum: CNC Plasma Cutters General Forum
Topic: List of available THCs?
Replies: 33
Views: 995

Re: List of available THCs?

Robert, When you are reviewing the THCAD, you are making similar mistakes to beefy, another mad Aussie plasma nerd who I've been swapping notes with. Here's what Peter from Mesa had to say to me this morning in answer to a question I asked Previously he had said to use the THCAD 1/32 divider with Li...
by Rodw
Mon Aug 28, 2017 6:29 am
Forum: CNC Plasma Cutters General Forum
Topic: List of available THCs?
Replies: 33
Views: 995

Re: List of available THCs?

Robert, your PC should be perfect for LinuxCNC and a Mesa 7i76e and even better if its a Celeron J1900 or N3160. If it has onboard wifi it will generally be useless as it leads to high latency. But a USB wifi dongle will be fine. Thats what I've done as I only have one ethernet port. The latest Linu...
by Rodw
Sun Aug 27, 2017 4:55 pm
Forum: CNC Plasma Cutters General Forum
Topic: List of available THCs?
Replies: 33
Views: 995

Re: List of available THCs?

Thats all right, I was sleeping while you were driving. LinuxCNC runs on a PC. I use an ultra small form factor PC about 4" square. Some have got it running on a Raspberry but it does not have the grunt to also run a graphical IDE. Because LinuxCNC is the motion controller, most people are usin...
by Rodw
Sun Aug 27, 2017 8:52 am
Forum: CNC Plasma Cutters General Forum
Topic: List of available THCs?
Replies: 33
Views: 995

Re: List of available THCs?

The issue with linuxcnc seems to also be motion controllers or lack thereoff and compatibility (but that is just my own personal impression of when in the last 18 months I looked at something better than mach3 and considered many options, and motion controllers) Robert, you are missing the point. L...
by Rodw
Sun Aug 27, 2017 6:49 am
Forum: CNC Plasma Cutters General Forum
Topic: List of available THCs?
Replies: 33
Views: 995

Re: List of available THCs?

You also will want a motion controller / motion control software that can control THC without affecting motion (mcodes which are activated in synchronisation with motion (mach3 = m10px+m11px, mach4 = m62+m63, uccnc m10+m11, or m205m206 or any of the other m sycron functions.... Uccnc is way ahead o...
by Rodw
Sat Aug 26, 2017 10:00 pm
Forum: CNC Plasma Cutters General Forum
Topic: What are the best electronics
Replies: 30
Views: 688

Re: What are the best electronics

Tom, I think I'm closer than most people realise. Perhaps, but if you can't hold + - 1 arc volt deviation at 250 IPM then you are going to be limited. OTOH it may not matter with the Everlast. I'm always up for a challenge. I'm at +-1.4 now. Thats well within the +-2-3 volts Jim Colt has quoted. Be...
by Rodw
Fri Aug 25, 2017 7:51 pm
Forum: CNC Plasma Cutters General Forum
Topic: What are the best electronics
Replies: 30
Views: 688

Re: What are the best electronics

Dan, we have about 4000 parts at work which we outsource to various laser cutters. Its rare for us to go past 10mm but when we do, we jump to 32mm. None of the laser cutters go past about 16mm. These thick parts either get cut on high def plasma or flame cut. The high def plasma requires less cleanu...
by Rodw
Fri Aug 25, 2017 6:55 pm
Forum: CNC Plasma Cutters General Forum
Topic: What are the best electronics
Replies: 30
Views: 688

Re: What are the best electronics

With all due respect to RodW: He has been working on this for almost a year. Its the "journey" for him (and the fact he lives in a Country where any import doubles or triples the price. He also has had to write software components for LINUXCNC to get to the level he is already. In his lis...
by Rodw
Thu Aug 24, 2017 4:21 pm
Forum: CNC Plasma Cutters General Forum
Topic: What are the best electronics
Replies: 30
Views: 688

Re: What are the best electronics

Thanks again for the reply Rod, What are your thoughts on UCCNC? I know nothing about it except I know another Aussie building a microprocessor based THC that uses the Mesa THCAD that I'm using for it. I forgot to mention, there is another LinuxCNC software component for THC that works well accordi...
by Rodw
Thu Aug 24, 2017 9:09 am
Forum: CNC Plasma Cutters General Forum
Topic: What are the best electronics
Replies: 30
Views: 688

Re: What are the best electronics

Thanks Rod, I appreciate you taking the time to to give me a detailed breakdown on the components. I also checked out your build thread and wow you put in some work. I'm going to take a shot in the dark and guess you're a engineer of some sort. I'm curious, on the software side is the integrated th...
by Rodw
Wed Aug 23, 2017 6:24 am
Forum: CNC Plasma Cutters General Forum
Topic: What are the best electronics
Replies: 30
Views: 688

Re: What are the best electronics

Here's my 2 cents worth. building a plasma table, bolting on some linear rails and whacking on a few motors, is not hard at all. Wiring up a few home and limit switches to some sort of control box is also not very hard. Getting the X & Y axes to operate using a CNC controller like LinuxCNC or Ma...
by Rodw
Tue Aug 22, 2017 4:48 pm
Forum: CNC Plasma Cutters General Forum
Topic: List of available THCs?
Replies: 33
Views: 995

Re: List of available THCs?

The best THC's are those that are built as an additional axis integrated on the same CNC and software that operates the whole cnc machine. It is necessary that the THC intimately communicates with the x and y axis in order to control real time cutting height to eliminate diving, collisions or other...
by Rodw
Sun Aug 20, 2017 12:34 am
Forum: DIY Plasma Table & Accessory Discussion Forum
Topic: Rod's Spaceship Scratch Built Plasma Table
Replies: 53
Views: 3131

Re: Rod's Spaceship Scratch Built Plasma Table

Well, finally! I have a PID based Torch Height Control. It worked on my very first cut :D :D :D https://forum.linuxcnc.org/media/kunena/attachments/20660/THCcut1-85volts_2017-08-20.png This is a screen dump from LinuxCNC's Halscope software Ocilloscope. The green line is the torch voltage The highes...
by Rodw
Fri Aug 11, 2017 5:35 am
Forum: CNC Plasma Cutters General Forum
Topic: Hello from Aus
Replies: 13
Views: 379

Re: Hello from Aus

Did you look at the Swiftcuts from Hare and Forbes? I usually manage to get 10% off on machines there.
https://www.machineryhouse.com.au/P9010
by Rodw
Thu Aug 10, 2017 6:32 am
Forum: Everlast & Longevity Plasma Cutters
Topic: Everlast CNC Port Errata - How it really works
Replies: 9
Views: 312

Re: Everlast CNC Port Errata - How it really works

hi never tested 16-1 not needed on our setup http://www.r-techwelding.co.uk/r-tech-cnc-plasma-cutting-machine-system-4ft-x-4ft/ cheers rob Rob, Thanks, I just have to change one resistor and I can scale to anything. Can you give me an idea of what the maximum torch voltage you've seen on the Everla...
by Rodw
Thu Aug 10, 2017 3:39 am
Forum: Everlast & Longevity Plasma Cutters
Topic: Everlast CNC Port Errata - How it really works
Replies: 9
Views: 312

Re: Everlast CNC Port Errata - How it really works

rrossetti wrote:Hi
here is the fix for the 50-1 divider board to work correctly

as used by us at R-tech


Awesome. Does that also give 16:1 with the link in the other position?
by Rodw
Thu Aug 10, 2017 2:08 am
Forum: Plasma Cut Quality Forum
Topic: Cutting corrogated metal
Replies: 5
Views: 298

Re: Cutting corrogated metal

If you stop and think about this, the Z axis maximum velocity becomes the limiting factor. It has to go up and down 1.5" every 1.5" of X or Y travel or thereabouts. If your cutting speed is set at a level beyond what the Z axis can cope with, you will get collisions. eg. My machine can mov...

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