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Messages - Tweakie.CNC

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8191
Hi Sweep,

At least 1 relay must be reserved for the 'Beer Dispenser'. Essential for good CNC work.  ;D

Seriously though, be careful what you switch with mechanical relays.
Anything which may cause a spark across the relay contacts such as a mains voltage inductive load (spindle) must be adequately suppressed (the type of RC device found across the switch inside mains operated power tools work well) otherwise the resulting spike may well cause a systems crash.

Tweakie.

8192
General Mach Discussion / Re: 4th Axis Steps per Inch?
« on: June 13, 2010, 05:06:36 AM »
The best solution, maybe, is to work in degrees - they are constant (steps/degree) no matter what diameter/circumference cylinders you are working with.

Tweakie.

8193
Show"N"Tell ( Your Machines) / Re: The Laser Project.
« on: June 12, 2010, 11:55:55 AM »
Although mentioned before the mass of my X Axis is such that my machine is not really suitable for raster use with the laser. However, having just tried the 'Impact/Laser engraving' plugin http://www.machsupport.com/plugins.php I was surprised to find that it includes feed / power compensation (the slower you go the less the power and visa versa) . My results are not that stunning but with a bit of practice with 'setting up' I am sure that reasonable results can be achieved.
Initial setting up was done using paper and this is my first attempt with an off-cut piece of teak.

Tweakie.

8194
Hi Jim (the Mole),

Welcome to the forum.
Some of us had to lie about our age when we registered  ;D

Tweakie.

8195
Hi Aidan,

I would not be downhearted. I think that at this stage you have to assume that it is just the psu board which has failed. Luckily it is old technology and there is nothing there that cannot be fixed / components replaced at relatively low cost. It would be wise to repair the psu and test it without the stepper drivers connected initially. Then connect and test the drivers one by one in case one of those is faulty also.
If you use a technician for this try to find one who doesn't stick screwdrivers in everywhere.  ;D

Tweakie.

8196
Hi Aidan,

Not much help but I have a sneaky feeling that someone has been to that power supply before you. From the circuit diagram those diodes do not appear to belong there. To melt the solder they must have got extremely hot and I am surprised that the 8Amp fuse did not blow first. I would suggest that one of the 32Volt, 5Volt or 12Volt circuits is drawing too much current but which is difficult to speculate. Try a closer examination, possibly using an eye glass, to see if you can spot any of the other components which may have overheated. Oh and check that the 8Amp fuse is actually 8Amp.

Tweakie.

8197
Excellent work Steve - I just love stuff machined out of the solid.

Tweakie.

8198
Hi Rene,

Quote
I think that this is not a very interesting project for this forum. In fact embroidery is too far of milling or turning

I disagree and think this is a very interesting project for the forum. I, for one, no nothing about Mach's role in machining fabrics but I am keen to learn and it's only by people such as you posting these topics which gives me that opportunity.

Tweakie.


8199
Very neat Chris - look forward to seeing the finished casting.


Tweakie.

8200
General Mach Discussion / Re: Different use of Mach3 (dispensing)
« on: June 09, 2010, 11:48:25 AM »
For my laser I use M11P1 to turn the laser on and M10P1 to turn it off. (these commands are added to the existing GCode in place of the Z- and Z+ commands).

I have the same problem with stopping mid line, the laser remains on.

The cure for this is, I think, to add a new, VB, screen 'stop' button which issues the M10P1 and then activates the feed hold function. Something similar could possibly be done for the single step function.

Tweakie.

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