Messages

101

General Mach Discussion / Re: Inverter Duty Motor

« on: January 19, 2008, 09:25:23 PM »

Another thing about inverter duty motors is torque and hp constants.  If a motor has a 2:1 Torque constant and base speed of 1800rpm at 60Hz, if you were to drop it below 30Hz or 900 rpm you will lose torque and the same for the hp constant.   But most inverted duty motors have higher constants usually 20:1 so if take 60Hz/20=3 you will have full torque at 3Hz or 90 rpm.  There are also 1000:1 motors.

102

General Mach Discussion / Re: plasma torch control

« on: January 17, 2008, 10:48:09 PM »

This RoHs stuff is a pain for all you in Europe,  If you plan on cutting I would say under ~40 IPM you can make one like you mentioned and it would work ok as long as you figure out how to have a clean arc voltage signal from the plasma.   Have you seen the Plug-in Brian made for a THC:http://www.machsupport.com/artsoft/plugin.htm

The higher power plasma you run the harder it will be to control it as more noise will be generated and if the arc fires above the material too high the voltage will spike high also.

I meant fast like ~200 IPM and staying with in 1 volt of the ~250 volts of the arc.

103

General Mach Discussion / Re: plasma torch control

« on: January 14, 2008, 09:46:06 PM »

To make a THC that actually works fast is a very complex task, commercial THC's cost ~$8k but here is one that people say works just as good or even better: http://www.candcnc.com/MP1000C.htm.

I will be buying one them in a little bit as soon as my plasma table frame is finished.

104

Third party software and hardware support forums. / Re: Mach control of Chinese lasers

« on: January 06, 2008, 04:40:54 PM »

See what these guys say:
http://www.solustan.com/products/Co2Laser

105

Third party software and hardware support forums. / Re: Mach control of Chinese lasers

« on: January 05, 2008, 08:36:53 PM »

Mach will control a laser just fine, just get the plugin here:
http://www.machsupport.com/artsoft/plugin.htm

You will need to have motor controllers that take step direction signals and thats pretty much it.

With the plugin one of the pins outputs a PWM signal to control the laser on time.
I bought a Sharplan 40 watt CO2 laser to build a engraver cutter just don't have a need for it right now, so haven't built it.

106

General Mach Discussion / Re: Z Axis will not plung to correct depth, Mechanical Problem or Program Code?

« on: December 31, 2007, 08:14:40 AM »

Put the code up so we can see what it's doing,  also if you need .75 and your code says .75 you will need to add for clearance over the material, so make you commanded depth .8 or so.

107

Show"N"Tell ( What you have made with your CNC machine.) / Re: RC airplane motor (electric)

« on: December 30, 2007, 02:36:42 PM »

Are you using the electronics from the HD also or a regular rc brushless drive?  Thanks for sharing!!

108

Show"N"Tell ( What you have made with your CNC machine.) / Re: iPod Nano Case

« on: December 30, 2007, 01:41:46 PM »

Did you do the anodizing your self?

109

Show"N"Tell ( What you have made with your CNC machine.) / Re: iPod Nano Case

« on: December 30, 2007, 01:01:25 PM »

Thats sweet!! Are those magnets that hold it together?

110

Show"N"Tell ( What you have made with your CNC machine.) / Re: Vice Stop

« on: December 29, 2007, 08:54:22 AM »

That's a trick idea!