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I have no idea now either now ...

Forget NEMA 34's for your application. They are too big and bulky and have a torque output way more than you need. Waaayy overkill. Doubling the voltage at least quadruples the torque. At 24 volts on my rotary table I had missing steps because of this. 48 Volts fixed this. TB6XXX drives have a...

Personally , I think the Arduino gives much more flexibility so you can program in other features like length of cut or peck drilling.

These are really designed for NEMA 34's which are too large for whatt is required where the small NEMA 23 is a much better option

Banggood is OK. A friend of mine has used it a lot. ebay in Australia Sucks. Its flooded with stuff from China that ships from Australia in the description but is sent in bulk to us from China and then posted by a logistics company. Very annoying as it takes a lot more time to arrive. Just...

Its all pretty simple to get a stepper running. But there are a few parts to it. 1. A step generator (eg Arduino) 2. A stepper controller. I use this http://rover.ebay.com/rover/1/711-53200-19255-0/1?icep_ff3=2&toolid=10001&campid=5338413729&icep_item=271115223142 3. a 5v supply to run the...

John, also the plasma spider forum is a good source of info. I weakened and put a briefer build thread there too https://plasmaspider.com/viewtopic.php?f=103&t=22826 But the forum is very Mach3 oriented. They have no idea what we've been able to achieve in LinuxCNC... Stuff that leaves the...

John, There are plenty of small tables out there. You have to be sure you can get plate steel cut down but you can cheat like I did with flat bar. for 3/8 you could get by with a 45 amp plasma cutter. Hypertherm 45XP or Thermal Dynamics/ESAB A60i. Here we'd use a laser cutting service for that...

I can tell you want one! You only need about 90-100 psi. This Thermal Dynamics A120 uses 189 Litres per minute (7 CFM). My single phase compressor produces 320 litres per minute (11 CFM) FAD (Free air delivery). This one is a bit old school and has a manual regulator built in and a set of...

For what its worth my rotary table controller here also has a linear mode and you can store different configs so the one controller could be used on the tailstock and a rotary table and as a milling power feed just by selecting a different device...

Um, I can answer that. They should be able to turn nicely at idle on just 1-4 psi. I took mine to work and hooked it up to 80 psi and it managed 16000 rpm briefly before it fell apart! so your lofty goal of 1000 rpm should be easy! The plans for this engine was the reason I joined this...

Scott, plasmas are constant current devices so its 120 amps all the way. Some machines can do a soft pierce and ramp up the current during the pierce to reduce the puddle splashing around to improve consumable life but this one has no such control. Yes I had to double check the pierce delay...

Well, the 16mm went OK. 1350 mm/min at 120 amps

Scott yes. There are two ways. One is to use Linuxcnc/c built in oscilloscope that lets you measure signals every millisecond. The green line here is the plot of torch voltage and the blue line at the bottom is the error (difference between actual and desired volts). The error signal starts...

Thanks Scott. That was actually the first crash with this plasma cutter. I had some spectacular ones with the old machine. In this case it was user error becasue I was too impatient to learn how to change the start point in Sheetcam. The previous ones were usually due to poor tuning resulting in...

I forgot to mention. There are two things to watch in the video. one is about half way through is the shaft joiner hopping around as it tracks variations in the torch voltage. The other thing is the magnetic torch breakaway activating right at the end of the cut. This was because sheetcam chose...

Its been ages since I updated this thread. I did get this table pretty well finished I had a lot of troubles with the experimental software I was running and kinda lost interest for a while. Then I sold the plasma cutter with the intention of buying a Hypertherm XP45. Then I moved my business...

Geez, I've just spent $3k taking water out of my air supply (for my plasma cutter) and here you are putting the water back in!! :(:(:eek::(:( I've not tried it, but I wonder if the air lubricator I've got here would be useful in this situation? Designed to oil air going to tools (Like my air...

Be careful Johnno, You will get the CNC bug with your first upgrade behind you now! ooops, I just purchased a 120 amp plasma cutter to go on my table. Pierces 16mm thick mild steel and edge starts 25mm! Very nice upgrade of yours though!

Great, thanks for letting us know :)