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Messages - Machinistdanny

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1
General Mach Discussion / Re: second post and I need help
« on: September 16, 2009, 05:47:40 PM »
Did you get this solved?  I experienced the same issue... even though you have the 4th axis disabled... it comes with pins 5 and 9 (I believe) set to the 4th axis.  Change those to 0 solved my problems.

2
General Mach Discussion / Re: Really need help
« on: August 30, 2009, 12:31:19 AM »
Howdy Tom, I have been fighting an issue very similar to yours.... for weeks now.  discovered my "fix" tonight.  I am using the keling controllers...but they say it requires the sherline half step mode (ie 40us pulses).  I found a thread on here where someone finally explained how that actually works.  You only get the 40us pulses at 25khz.  The pulses are shorter as you select a higher kernal speed.  I am cutting a 3d model now at 34k lines...looks perfect.  Give that a try.

3
General Mach Discussion / Re: apparent loss steps?
« on: August 12, 2009, 10:47:58 AM »
Howdy guys and thanks for the support.  I have read everything I can find about micro stepping and really dont understand the results I am seeing.  I have a Keling 36v power supply and controller and 425ozin motors.  I have the controllers set to 3amps. I originally setup my machine with 1/16 stepping and was losing .330 in z while cutting a 3d sample model from Aspire2 (vectric).  I have ensured enhanced pulsing is selected, I have the sherline 1/2 pulse mode selected.  I changed the stepping to 1/2 and my z was off by .500 within 5 minutes of running.  So I went to the other extreme and set it to 1/64.  I was able to finish the model (4"x4") and was off by 0.085 when done.  I have no more selections for microstepping, even though I dont understand why more microsteps would reduce loss steps, how do I get this dialed in.  I have the x and y axis set at 30in/min with acc set to 2.  I have the z axis set to 15 in/min with acc set to 4.  Assuming these are the only values left to play with, which way do I go?

4
General Mach Discussion / Re: apparent loss steps?
« on: August 09, 2009, 07:22:04 PM »
OK... not what you guys directly suggested... but it lead me to the answer.  Mach3 came with the a axis set to pins 5 and 9.... must have been intefering.  When I set them to 0,0... problems went away.  Now I just hope the Sherline 1/2 pulse mode fixes the dropped steps problem.

5
General Mach Discussion / Re: apparent loss steps?
« on: August 09, 2009, 02:55:29 PM »
The motors and controllers are Keling, after reviewing their documentation Sherline 1/2 pulse mode is the culprit.  However this is causing another problem.  When checked the y axis moves in the same direction no matter what direction told.

6
General Mach Discussion / Re: apparent loss steps?
« on: July 29, 2009, 03:41:31 PM »
It is a 3d cut, with an overall max cut of -0.605 in z.  But after finishing just over half the lines z is off by -0.330.

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General Mach Discussion / apparent loss steps?
« on: July 29, 2009, 10:47:09 AM »
Hi all, I am new to CNC and trying to work out the bugs of my new DIY kit from BuildYourCNC.  I am not sure the make of the controller or breakout board but the steppers are 425oz motors and lead screws are 4tpi.  I have done the math and have the steps set at 12800 for 1/16 and seems correct.  I am using Aspire2 for my models.
While trying to cut a finish pass with 1/8" ball nose on an aspire example file the z axis is off by 0.330 after cutting about 8" of the model.  I changed the "uS" setting to 5 and changed to 1/4 stepping (also did the math for changed stepping)... this resulted in being off 0.330 in less than 2".  When I say off by 0.330 it is cutting too deep.  Guess I should have mentioned I am running Mach3.

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