Messages

6511

General Mach Discussion / Re: Pulse engine noise

« on: April 29, 2011, 04:01:08 AM »

If you have onboard graphics this can cause problems. Some have disabled the onboard graphics in BIOS when they have fitted a PCI type graphics card.

Tweakie.

6512

General Mach Discussion / Re: cnc for milling out a circuit board

« on: April 29, 2011, 03:37:08 AM »

I don't understand the problem.
I usually use the surface of the work as Z=0 so I would edit your GCode to replace the Z0.0000 to be Z-0.007 or something like that.

What is the problem you are having ?

Tweakie.

6513

General Mach Discussion / Re: Is the motor diameter more important than voltage?

« on: April 29, 2011, 03:24:48 AM »

In my opinion that is only a rule of thumb rather than a fact (rare earth magnets made big differences to motor performance in recent years). However, if you consider leverage then a larger diameter armature will produce more torque for a given current (bit like using a longer spanner when tightening a nut) and therefore should be more powerful.

Just my 2 cents.

Tweakie.

6514

General Mach Discussion / Re: STEP MOTORS CONEXTION

« on: April 29, 2011, 02:26:29 AM »

E,

One of the problems that is being seen more and more often now is that older breakout boards / controllers require the full 5 volt TTL logic signals and modern computers / parallel ports output the 3.3 volt TTL standard.
May be an idea to check your parallel port with a multimeter (negative probe to GND [pins 18 to 25] and positive probe to any direction pin then jogging that axis the meter should read approx 5 volts in one direction and approx 0 volts in the other.

Tweakie.

6515

General Mach Discussion / Re: Text in an arc

« on: April 28, 2011, 11:45:46 AM »

Try this http://www.ncplot.com/stickfont/stickfont.htm

Tweakie.

6516

General Mach Discussion / Re: halfmoon instead of circle

« on: April 28, 2011, 08:58:10 AM »

Just looking at your photo's again - that LPT cable looks very small diameter so must be very small wires, try another cable and make sure that the shield / 25 way connector outer metal part does not connect to your machine ground. (this cable screen is connected to earth at the PC end)

Tweakie.

6517

General Mach Discussion / Re: halfmoon instead of circle

« on: April 28, 2011, 08:51:51 AM »

May be an idea at this stage to just try another PC, just in case it is your PC which is at fault.

Tweakie.

6518

General Mach Discussion / Re: circular interpolation not showing on arc cutting surface

« on: April 28, 2011, 06:56:36 AM »

Sorry but I have never seen another one of these.

(It is 240 volt 3 phase, has internal shaft brushes to connect rotor to frame (perhaps ceramic bearings) used to have a magnetic shaft brake on the top where I have now fitted a cooling fan and had a high ratio planetary gearbox on the front. It is German made and came from a large format printer transport mechanism - it was perhaps used as a servo motor ?).

Tweakie.

6519

Share Your GCode / Re: Hiking trail symbol g-code needed

« on: April 28, 2011, 02:13:42 AM »

Looks like Jeff beat me to it. 

Tweakie.

6520

General Mach Discussion / Re: Spindle On Off Setup No 5VDC at relay.

« on: April 27, 2011, 01:20:39 PM »

You need a driver circuit of some kind to drive the relay. The 5 volt that you are measuring is the voltage from the computer LPT port and that only sources a couple of milliamps and is not enough to drive a relay on it's own.

You could use an opto isolator, the output side would need a separate 5 volt supply to power the relay.
You could use a TTL gate, again a 5 volt supply would be necessary.
You could use a different BoB which already has the relay and drive circuit.

There are many options.

Tweakie.