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Messages - comet

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251
General Mach Discussion / Re: Power Supply Voltage Too High
« on: November 28, 2007, 04:33:49 PM »
oh! it should have been unwind the secondary not the primary,it wouldnt affect the 5volt tap.
  Tony

252
General Mach Discussion / Re: Power Supply Voltage Too High
« on: November 28, 2007, 04:22:37 PM »
Hi,
  Resistors are not an elegant way of dealing with excess voltage but it will work!
  you could use a voltage regulator, there's a company called "linear" who make one that should suffice.
google it and download the data sheet,there is usually basic circuits on the sheet that do.
  Its just the regulator a couple of capacitors and a pot.
Or if you want to go silly get a couple of 555's and build yourself a pwm stepdown circuit.
have a look at this.
   http://www.eleinmec.com/article.asp?28
    Tony

253
General Mach Discussion / Re: Power Supply Voltage Too High
« on: November 28, 2007, 02:57:45 PM »
hi,
  if its a wound transformer just unwind the primary untill you get the voltage you want.
You will lose amps prorata.
  Tony

254
General Mach Discussion / Re: need help! new driver wont work with mach 3
« on: November 24, 2007, 02:58:42 PM »
Bret,
  It was a while ago,I cant remember the figures,but I do remember that at 1/16 steps it was delivering
50% less torque.I googled it after and found that it was the case. try it yourself. This was one of the reasons I went to servo's.For all the wasted time I had with steppers, hours of tuning and retuning and harmonics,added to that the sloooow
rapids.I would never build another stepper system.
   Tony

255
General Mach Discussion / Re: need help! new driver wont work with mach 3
« on: November 24, 2007, 01:45:19 PM »
HI,
  for my twopenceworth micro stepping will reduce torque at all speeds.
 When I was using steppers I did some experiments.
  Basically put a bathroom weighing scale on the bed and drive the z into it at any speed ,it will
stall the motor and note the weight. then start microstepping,and you will find
that there is less power.
     Tony

256
General Mach Discussion / Re: Video Card
« on: November 24, 2007, 01:34:05 PM »
Hi,
 on the strength of thie topic I just picked up a quadro 4 980gxl from
ebay £17 and its the best card Ive used I would have to agree there good!

257
General Mach Discussion / Re: Dell model DHP
« on: November 22, 2007, 04:42:30 PM »
no prob,
   place the card in the slot with the standard plate on and mark the point at which to bend it.
bend the plate before shortening it,you can always hammer it flat again if you get it wrong.
you will need to use the single securing screw to stop it flapping about!
   Tony

258
General Mach Discussion / Re: Dell model DHP
« on: November 22, 2007, 01:37:42 PM »
Hi,
   I have a couple of NEC small form desk tops,both have pci parallel ports fitted.
All you need to do is buy half hight cards(most cheaper cards are),remove the mounting plate and "modify" the
plate to fit.
   Tony

259
General Mach Discussion / Re: Breakout Boards
« on: November 18, 2007, 03:40:16 PM »
hi,
forwarned is forarmed they say !
if The main chip says Netmoss on it it should work fine
    Tony

260
General Mach Discussion / Re: Breakout Boards
« on: November 18, 2007, 12:06:32 PM »
Jeff,
  yes those opto22's are great I use them whenever I need to switch AC from 18-230 volt.
Plus there forever coming up on ebay for next to nothing!
  I supose with my builds I take a "minimalist" view,and I never use an expensive controller computer.
as long as its 2gig and costs less than £100 then its a winner.
  Tony

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