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Messages - DennisCNC

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121
General Mach Discussion / Re: Pendant/control panel with PIC 18f4221.
« on: August 07, 2007, 10:10:33 PM »
^^ What he said

122
General Mach Discussion / Re: Pendant/control panel with PIC 18f4221.
« on: August 05, 2007, 02:46:29 PM »
You might want to start out with one of these as it will give you easy ModBus interface and a few people here on the forum can give you some tips,  I'm still learning this CubLoc thing.   It is very easy to use even for me:)
http://cubloc.com/product/01_01.php?PHPSESSID=e0f0bcf90b5e4678f73113b69cde25af

123
General Mach Discussion / Re: estop and limit switches
« on: August 05, 2007, 02:24:23 PM »
I would recommend you get one of these break out boards:
http://www.cnc4pc.com/Store/osc/product_info.php?cPath=33&products_id=49
The C1G

I'm no expert but got the first machine running in 15 min with that board and the good thing about the board is it has led's so you can see what each output and input is doing even without a  computer connected.


124
Galil / Re: Galil/Mach3 stepper motor accuracy confusion
« on: August 05, 2007, 02:14:44 PM »
I don't know what max pulse rate is for a Galil card and Mach3.  But it doesn't make much difference if you run steppers at 1/4 micro step or 1/30 micro step as long as you can supply enough steps in one second you will have a some high rapids. 
On one of mine Bridgeport mills that I retrofitted with Mach3 it has a 200 step/rev motor with a 10 microstep drive with a 2:1 reduction and a 5 turn screw this gives 20,000 steps per inch and it does ~60 inch/min max travel speed this setup will give you  .00005 resolution with plenty of speed on a 4x4 machine. 

There is now way to change micro step resolution because the CNC software has no way to know when the drive changed from 1/4 to 1/16 or so.  And there is no need for something like that. 

Take a look at some of the videos here:
http://www.romaxxcnc.com/video.htm#

I'm pretty sure they are running mach3 and I would say that is plenty of speed for 99.8% of the projects and people.

So do you want your machine to be very fast or very accurate?   With the Galil card you have it will be both and then some.

125
General Mach Discussion / Re: Driver Cards
« on: August 04, 2007, 10:29:24 PM »
When I was starting out with this cnc stuff I bought a 4 axis card from DTLLC.COM also.  But quickly realized that it will not work well for a cnc application as it doesn't have micro stepping and current chopping.  The drives from Keling are the way to go.

126
General Mach Discussion / Re: estop and limit switches
« on: August 04, 2007, 10:12:58 PM »
Are you using a break out board?

127
Galil / Re: Galil/Mach3 stepper motor accuracy confusion
« on: August 04, 2007, 09:50:02 PM »
I'm wondering why you need to use .45 deg stepper?  You can buy a regular 1.8 deg stepper and a 1/16 micro step drive and you will have .1125 deg per step and will most likely cost less.

Mach3 puts out step and direction signals for the motor drives to use, either stepper motor drive or ac/dc servo motor drive.  The software doesn't do any type of micro stepping it is the drives job.   As long as the drive you have or are going to buy accept step and direction signals then Mach3 will run it fine.

128
General Mach Discussion / Z home before cycle start?
« on: July 27, 2007, 10:42:13 PM »
Is there a way to make the Z go to the top before the machine starts moving after Cycle Start was pushed if a input is active(high)?  I want this to be a safety measure, until the input is low the machine will start moving only after the Z is at the top.  But if the input is low the machine will follow the code normally.   

Or if that is not possible then a Z inhibit when the Z is at Machine coordinate 0",  before the machine starts moving with the input high.


Thanks

Dennis

129
Show"N"Tell ( Your Machines) / Re: hardinge hnc to retrofit
« on: July 27, 2007, 10:07:41 PM »
I found one for less then $500 locally.  Just keep looking.

130
General Mach Discussion / Re: Servo motor AC
« on: July 27, 2007, 10:04:06 PM »
Good one how?  If it works or good for cnc application?

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