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Messages - BluePinnacle

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201
General Mach Discussion / Re: Mach3
« on: August 31, 2009, 07:16:41 PM »
Also make sure you've enables the axes and set up your motor tuning to some realistic (if imaginary) values, or it may not play. Had this problem on a laptop recently that I was using for simulation only.

202
Share Your GCode / Re: Soft Start for Spindle Motor G Code Routine
« on: August 31, 2009, 04:51:43 PM »
^Also good, and more practical in use :)

203
General Mach Discussion / Re: USING DIFFERENT STEPS PER UNIT
« on: August 30, 2009, 07:50:02 PM »
No, just use the motor tuning menus to allow for the different screw pitches. Set up the steps per unit for each axis.

mixing metric and imperial screws may give you problems as you can only have one set of native units ;)

204
General Mach Discussion / Re: Line Limit with License
« on: August 29, 2009, 07:04:05 PM »
Yeah, had me stumped for ages.

Just to keep it all polite and happy I always make G and M commands three characters long and capitalised: ie G00, G01, G02 so that I can see at a glance if there are any missing characters. Similarly dimensions are always written to two decimal places (or three, depending on the program) Again, with the code written like this I can see at a glance if there are any missing characters.

205
Share Your GCode / Re: 10-blade pump impeller- G68 demonstration
« on: August 29, 2009, 06:48:57 PM »
Ah, ok, thanks. I'll do that.

So far so good with Mach3, I have a lot of confidence in it, and had assumed until now that it was me being dumb. tool comp would be useful in G68 ;) thanks.

206
Tangent Corner / Re: CNC fire hazzard.
« on: August 29, 2009, 02:17:54 PM »
Oh, misery :(

I've got my bases covered, my mill came with an overload cutout on the spindle contactor. Triggering this estops the whole thing and it slams to a stop with no power to spindle or drives. Shame this one didn't have such an arrangement.

207
General Mach Discussion / Re: Lathe spindle brake
« on: August 29, 2009, 01:57:41 PM »
Not sure if it helps but my mill has a pure hardware braking solution - the brake (1)  contactor has a delay module on top which waits 250 ms when triggered, so the brake comes off, and 250ms later the spindle contactor (2) is triggered to start the spindle. The brake reapplies instantly if the spindle is shut off.

Reversing is similar, the reversing contactor (3) is triggered by an output, and as it closes it triggers the brake contactor (1) which triggers the spindle contactor (2) as normal and completes the circuit.

This way at least you can keep the software side simple and rely on dumb mechanical stuff to do the essentials.

208
Share Your GCode / Re: 10-blade pump impeller- G68 demonstration
« on: August 29, 2009, 01:43:48 PM »
this is it with the comp in:

(CENTRIFUGAL IMPELLER)
(TEN BLADES)
(NOT DESIGNED AS SUCH)
(THIS IS JUST A DEMO :p )

G40
G64
G21
G0 X0 Y0


#1=0
#2=4.5

M3 M8

G00 Z1.00
M98 P777 L5
G00 Z10
M5 M9
G00 X0 Y0
M30

O777
#2=[#2-4.0]
M98 P333 L10
G00 Z1.0
M99


O333
G68 A0 B0 R#1
G00 Z1.0
G41<---------------------------------------------------HERE
G01 X100 Y-60 F700
G01 Z[#2+1]
G01 Z#2 F150
G02 X45  Y0 R50
G03 X100 Y-60 R80
#1 = [#1+36]
G40
G69
M99
%

209
Show"N"Tell ( Your Machines) / Re: My fireball v90 setup
« on: August 29, 2009, 08:47:38 AM »
That's a very nice machine, should be good for PCBs and all sorts of things. Well done, you'll have fun :)

... and you won't have to go round it with a mop like mine, lol

For particles: how about a better vacuum cleaner with an HEPA filter? they'll trap pretty much anything.

210
Share Your GCode / 10-blade pump impeller- G68 demonstration
« on: August 28, 2009, 09:16:13 PM »
Here's a little one I've been trying to get right for a while. It's a ten-bladed impeller, made using G68 angular offsets, nested subroutines and primitive parametrics. As an actual pump impeller it's probably pretty crappy, but it shows the principle well and you could easily get the feel of this code and apply it to any sort of rotational shape.

One thing that hexed me throughout was trying to apply a tool diameter offset to the program ... try it and see what happens, it's extremely wierd. Is there a way round this, or can tool offsets not be used in G68? Let me know, I'm intrigued as to what it is.

(CENTRIFUGAL IMPELLER)
(TEN BLADES)
(NOT DESIGNED AS SUCH)
(THIS IS JUST A DEMO :p )

G40
G64
G21
G0 X0 Y0


#1=0
#2=4.5

M3 M8

G00 Z1.00
M98 P777 L5
G00 Z10
M5 M9
G00 X0 Y0
M30

O777
#2=[#2-4.0]
M98 P333 L10
G00 Z1.0
M99


O333
G68 A0 B0 R#1
G00 Z1.0
G00 X100 Y-60 F700
G00 Z[#2+1]
G01 Z#2 F150
G02 X45  Y0 R50
G03 X100 Y-60 R80
#1 = [#1+36]
G40
G69
M99
%

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