Thanks RICH for the replies and help.
I should although be more clear about how I arrived at where I am on this. I have made several parts, just playing mostly. I've set the drives per calculations and verified with a dial indicator, also using it to verify backlash. So far, I'm setup retty tight on steps and backlash as verified through a dial indicator,,,,,, but still,,, have a few lost steps through different actions taken through Mach3turn.
I spent some time tonight troubleshooting everything. My wife stood by and took notes as I spoke what I was doing.
Here is some trials I was doing tonight. This is only a part of what we did,, but I wanted to keep the post short,, and add as needed.
(Tool #1)
Setting Tool in Tool Table
Turning diameter = .7085 Z0
Turned to a DIA of .7085 Clicked touch X
Faced the end, Clicked touch Z
DRO Access coordinates reading: X offset/X wear and Y offset/Y wear are all 0.000
Quit tool table screen
Returned to manual screen
Clicked Home X and Home Z
*SUCCESS* (as best I can tell, it moved near where I originally set home limits)
To Verify part coord after tool setup.
MDI
Z0 X.7085 (diameter from setting part zero x)
Tool was right on the OD and the end of the part. (Visual)
To check programmed DIA cuts.
On manual screen: MDI to X.670
Manually jogged Z to cut
Diameter = .670
On manual screen: MDI to X.650
Manually jogged Z to cut
Diameter = .650
Opened tool table to check tool info, closed and went back to manual screen
On manual screen: MDI to X.60 (From last DIA of .650)
Manually jogged Z to cut
Diameter = .631
??
*FAIL*
Re-zeroed part in X
Made facing cut
Diameter = .609
Typed in .609 in part zero
Clicked part zero X button
On manual screen: MDI to X.580
Manually jogged Z to cut
Diameter = .597
??
*FAIL*
Attached Mechanical Dial Indicator to measure movement of X axis (NO Part Machining)
Jog increment = .1 inch
Diameter mode, result should be .050
Jogged positive X 6 times and each time resulted in .050 each time
Jogged negative X 4 times and each time resulted in .050 each time, (backlash comp verification,, set correct)
Verifying turnings with Dial indicator attached. (Part Machining)
On manual screen: MDI to X.609
X.609
zero the indicator.
MDI X.58
Should go .0145 inches but it went .0055 (DIA Mode)
Told it to go back to .609 and it went to 0
Went back to test this in jog increment of 0.100
Indicator Readings
1. X.048
?
2. X.091
?
Zeroed indicator and repeated jog increment 4 times 1) .050, 2). .050 3) .050 4.) .050
Moved to Home X and Home Z. Home X crashed slightly in negative.
I have no conclusions to any of this.....
My settings are below.
Current Config Setup.
Motors
Both motors are 4.2v, 3 amp, 305 oz/in
X axis = 1/8 step, Direct Drive of a 20 TPI Lead screw, (.050 per turn)
Steps per revolution = 32,000
Velocity = 30
Accel = 1
Step pulse = 0 (I never set this)
Direct pulse = 0 (I never set this)
Z axis = 1/8 step (Using threading lead screw on lathe, 16 TPI, two timing pullys 1:1.5, 38400 calculated, Indicated to 38,360)
Steps per revolution = 38,360
Velocity = 25.002
Accel = .75
Step pulse and Direct pulse = 0 (?)
Backlash Comp
Backlash X = .0012 (Per Dial Indicator)
Backlash Z = .0185 (Per Dial Indicator)
50%
Both motors are 4.2v, 3 amp, 305 oz/in
Shuttle excel = .1 second
Motion mode = Constant velocity
CV Control
CV distance tolerance = 60
G100 adaptive nurbs is checked by default
Stop CV on angles is unchecked
Distance mode = absolute
IJ mode = incremental
Ports & Pins
Port enabled is checked
Kernel speed = 25,000Hz
EStop Checked,,, Low active Unchecked
X and Z axis Low active and Step Low active both Unchecked.
Hope I have provided enough info for a guru to see the problem,,, any questions please ask,,,
Thanks! Any help is appreciated greatly.
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