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Messages - kf2qd

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71
Promote and discuss your product / Re: Mach3 as 3d printer software
« on: October 27, 2010, 10:43:05 AM »
There has been another discussion of this , what you might want to consider is using the spindle speed as the extruder control. Would give you a way to start and stop the extrusion, as well as control the extrusion rate. Might require that you do some translation of output codes, but that should be a faily straight-forward text substitution which could be done using find/replace all, or by writing a small program in basic/C/other language of choice.

72
General Mach Discussion / Re: custom application
« on: October 27, 2010, 10:33:22 AM »
You might need to put what I call a reset circuit between Mach and the stapling machine. As it is flywheel driven and will repeat if the solenoid is held in. It would need 2 relays, with the second 1 wired as a latch. Relay 1 is just on off from Mach, Relay 2 is latched by a switch that is tripped as the staple head starts down. Use a noramlly open contact on the first relay in series with a normally open contact from the second relay.

    signal from MACH             Coil from Relay 1
|------| |----+----------------------------------( )-----|
|             |                                                       |
|             |   Switch on Head         Relay 2           |
|             +---------| |--------------+---( )----------|
|             |                                  |                    |
|             |     N/C on Relay 2        |                    |
|             +----------|/|-------------+                    |
|                                                                    |
|           N/O Rel 1      N/C Rel 2      Solenoid      |    
|---------------| |-------------|/|---------( )-------|

73
Sieg Machines / Re: X axis looses orintation
« on: October 25, 2010, 04:37:28 PM »
Did you use G42 for your first part and G41 for your second part? G41 "sometimes" has issues and the Mach folks are aware of the problem.

You also might want to look at Config/Motor Tuning and look at the step pulse for each axis. This should affect things the same all the time, but ... They say it should be some value between 1 & 5 but my machine seems to like 6. If it is too low you may miss a step or steps.


Di the motors sound different during the time when the motin did not follow the path? that is the first sign that you are either missing steps or overloading the motor.

74
General Mach Discussion / Re: Output voltage problem?
« on: October 14, 2010, 04:27:51 PM »
Problem is that the printer port outputs are not meant to handle much current. You need to have teh output from the computer go to a transistor that is sized correctly for the curent teh relay requires. Normally this is a function provided by a "break out board". It isolates the machine electrically from the computer and priovides the circuits to be able to handle the cuurent requirements of real world components like relays and such.

What is the relay switching? AC or DC and what current? there are a number of solid state realys that are able to switch higher currets, but are meant to take a low current control signal.

75
General Mach Discussion / Re: Charging for CNC Time
« on: October 14, 2010, 04:20:55 PM »
Are you running programs you create? Or that the customer creates? Do you have to do work on the drawings? or do they come from your customer with everything cleaned up? How much does it cost for the operator (wages, benefits, disability, etc) How much does the floor space cost a month? What are your monthly costs for the machine?(payments, interest...) How much do any competitors charge? How much for cutters and electric? How much time is going to be spent loading and unloading the machine?

You will probably have to charge a bit less to start with, just to get them hooked, and figure out the best practices for getting the work done. After a bit of work you will get a better idea of what the real costs are. What is the going rate for shop time in your area?

Years ago I ran an old Tape Turn Regal. The shop charged twice the rate for the rest of the machines in the shop. After my first month they made money hand over fist because, once I figured out how to run it, I could get so much more work done that the manual machines. The hourly rate may sound a bit high, but if you are runnng it right you should be getting things done faster so the end product doesn't cost any more.


76
General Mach Discussion / Re: plasma anti dive
« on: October 13, 2010, 02:33:31 PM »
Some Plasma Torch Height Controls have the necesary stufff inside to do this function - sudden changed in carc voltage will be ignored, gradual changes will be compensated for. The other function is a Torch Height Control Disable function that is controlled by the CNC. This prevents the torch from dropping onto the plate when the machine slows down coming into a corner, or when cutting small circles where the machine can't run full speed.

Which function are you talking about?

77
General Mach Discussion / Re: Foam cutter with 4 independent of each other?
« on: September 24, 2010, 10:49:47 AM »
Here's an idea of what a foam cutter might look like. ( sorry about how it looks , it was a quickie...)

78
General Mach Discussion / Re: Foam cutter with 4 independent of each other?
« on: September 24, 2010, 10:05:52 AM »
Here's what I hear you descibing - you wnat to build a foam cutter with vertically mounted parallel X-Y stages at each end, and a hot foam cutting wire streched between them. A typical use is for cutting foam cores for model airplane wings.

Here's how I would set it up - One X-Y stage would be called X & Y in  Mach and the other would be A & B. A is parallel to X and B is parallel to Y.  A & B are both configured as LINEAR. And I am assuming the steps per inch are the same for all axis.

There are 2 ways of controlling the motion - if your parts have no tapers you could pprogram everything as X & Y moves and all motion is available, go to the Functin Cfg menu and select formulas and in the A line put X and in the B line put Y. The AB stage will copy the motion of the XY stage. If you want some other ratio (AB end 3/4 of the XY end  then you would put x*.75 in the A line and y*.75 for B)

The other method has more flexibility - but is restricted to G0 and G1 - No changes in formulas, A =A, B=B, but you would have to program only in line segments. each line would  look like this - G1 X___ Y___ A___ B___ F___ and would start and finish at the same time. As long as you used short line segments you would hardly notice them, and a quick touch with sandpaper would take care of that, BUT both ends of the motion could have completely different motin profiles. Airfoil 1 and the XY end, and Airfoil B on the AB end. You could even program a twist intothe profile, End XY is parallel to the X axis and AB is rotated 3 degress to the A axis.

Does this sound like what you are trying to do?

79
I have the latest version working on several Dell's and have had no problems. You made one statement that you had a lot of stuff loaded on the HP and that would be the first place I would look. All the documentation says to have as clean a machine as possible, and there are instructions on how to optimize for MACH3. The more stuff you have running on the computer the more likelyhood of having problems. The machine that is running MACH wants to have as much processor time to dedicate to the motion routines, and anything else that is running on the computer will be taking away from MACH. An older computer that you can dedicate will outperform a newer computer that is all juked up with other stuff running as that stuff all steals time that MACH needs to work. Kind of like what happens when teens try to use the cell phone or text while driving. The main task suffers because all the other tasks take too much away from it.

80
G-Code, CAD, and CAM discussions / Re: is there a name for this kind of cut
« on: September 20, 2010, 03:20:55 PM »
What kind of accuracy, and what kind of quantities? aif you make the center of the part 0,0 the code is real simple. I & J would both be 0(zero) for all the cuts. Just a matter of subtracting the cutter radius for the bore and adding the cutter radius for the OD's.I would have teh bottom of the part as Z0 and go from there.

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