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Messages - moxy

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General Mach Discussion / Re: mpg
« on: October 11, 2012, 01:42:13 PM »
I finally found the cause.........I had connected the mpg to the controller 5v instgead of the usb 5v. Swapped irt around and it's working sweetly.

General Mach Discussion / Re: mpg
« on: October 10, 2012, 04:21:02 PM »
I think you are right so I'll see if I can move the glass scale a bit and see if that helps.

General Mach Discussion / Re: mpg
« on: October 10, 2012, 10:49:40 AM »
Hi Hood, Thats what I thought too so I tried a different mpg and got the same result. I'm using and old stepper with an encoder on it and the only detent I have is the normal magnetic one  of the motor. Many thanks

General Mach Discussion / mpg
« on: October 09, 2012, 06:41:38 PM »
Hi AllI am using a 1000 line encoder in a home built MPG which works fine except.......when I stop moving the handwheel the axis starts tiny jog movements back and forth ans you can hear the stepper "singing to itself" I have tried 2 other encoders with the same result. Anyone have suggestions to fix?
Many thanks

General Mach Discussion / Re: accuracy problems
« on: April 29, 2011, 09:03:25 AM »
Hi Hood, thanks for your reply, I found the problem this morning. When I enabled any of the Gecko drives the 5v supply became very noisy and therefore put noise on the step and direction signals to the drive. I added some more capacitance to the 5v supply and the machine is now cutting very accurately.
Best regards

General Mach Discussion / accuracy problems
« on: April 28, 2011, 03:28:00 PM »
Hi All, I have just done a retrofit on a Standard Mill (Chinese knockoff of a Bridgeport) and am having problems getting the cals right on the Y axis. I finally got it set by the change and check method to the point that a 100mm move is consistantly within .01mm. When I run some gcode the result is somewhat erratic. Circles are slightly flattened in the y axis. I have tuned the motor down to 1500mm/minute  and it is the same. The x and y axes are capable of moving at 4000mm/min and 2500mm/mi respectively and sound very steady. I found that the bob 5v was very noisy when I enabled the motors and fixed that up by fitting a larger capacitor. This stopped the erratic motor movement that I was having. The noise on the 5v is now about 3 millivolts. The backlash on both axes is 0.02mm Is there anything in setting mach3 up that I may have missed?

General Mach Discussion / Re: calibrating
« on: February 14, 2011, 03:03:19 PM »
Many thanks Jeff, I will give it a try.
best regards

General Mach Discussion / calibrating
« on: February 14, 2011, 02:50:49 PM »
Hello all, I am trying to calibrate my dividing head (rotary axis) and am having the following problem. I am using the set steps utility in the settings screen and when I set the amount of degrees I want the divhead to turn a weird thing happens. If I set 360 degrees no movement occurs. If I set 359 degrees it moves 1 degree in the opposite direction. The position is correct but the stupid thing took a shortcut! If I set 330 degrees it goes 30 degrees the other way. Am I doing something completely dumb or should I operate the thing via a mirror ;D (lol) Any ideas?


General Mach Discussion / Re: Timing pulleys
« on: August 03, 2008, 04:47:36 PM »
Hi Overloaded, Many thanks for your info, it has sorted out my frustrations no end.
best regards

General Mach Discussion / Timing pulleys
« on: August 03, 2008, 12:46:45 PM »
Hi Guys, can anyone help with info on timing pulley dimensions? I need to make some 3mm pitch pulleys and the maths is driving me nuts! If you multiply the number of teeth of your pulley by 3 (pitch) you get the circumference and from there you can calculate the diameter. So far so good. When you cut the pulley the pitch is too coarse. Not good! I have some commercially made pulleys and measured them and the diameter of a 13 tooth comes out at 11.6 mm and the calculated diam is about .8 mm bigger. This is unfortunately not a constant and will increase with larger pulleys.(i think!)
Any suggestions

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