Messages

761

G-Code, CAD, and CAM discussions / Re: reset home with G code

« on: July 07, 2008, 01:13:59 AM »

Hi, Sam

If I understand, Your code finishes X## Y## Z## and you want to Zero the DRO's at there current position with G-code or M-code. ?

The attached Macro, M2500.M1S will do this for you.

You need to put it in your Macro folder for the Profile your loaded at startup. Example: C:\Mach3Mill\Macros\Mach3Mill.

Add the M2500 in as below, In your G-code file.

N255  X2.0380  Y1.1590   
N260 G0  Z1.0000
M2500
M30
%

It can be changed as needed, It's just some DoOEMButton,s 1010, 1009, 1008, z,y,x, Same as Pushing the Zero X,Y,Z, Buttons.

Let Us Now, Chip

762

G-Code, CAD, and CAM discussions / Re: reset home with G code

« on: July 06, 2008, 09:04:40 PM »

Hi, Sam

Put 

G00 Z0
G00 X0 Y0
M30

Before the M30 in your G-code files should do it.

Chip

763

General Mach Discussion / Re: Setting up a 4th axis?

« on: July 06, 2008, 06:01:48 PM »

Hi, Bill

It was late, Sorry for the error's, I'll Blame it on my Calculator.

But your other comments,

"these numbers show without rounding as the pulses increase"

Mach Doesn't just put up values It thinks you'd like See,  Expand your DRO to show 00000.00000000000000000000 Accaurcy and look at it.

"doing big resolution with microstepping is kind of phony anyway,but it makes the DRO look good. big solid resolution is done with gearing".

I've herd some comment's on Micro-Stepping from some, There may be slight position error's between full steps, But after moving millions and millions of

moves, You make it sound like you'll never get even close to your Home Position, My rotary table is geared and Micro-Stepping, Returners to 0.0

Please think about it.

Thanks, Chip

 

764

General Mach Discussion / Re: Setting up a 4th axis?

« on: July 06, 2008, 05:00:40 PM »

Hi, Dave

My Sherline works very nice, Great value, Didn't think you wanted to split hair's, Just wanted to get something running.

Thanks, Chip

765

General Mach Discussion / Re: Setting up a 4th axis?

« on: July 06, 2008, 02:38:00 AM »

Hi, Bill 

Not trying to split Hair's hear, There some part's that Dave has sitting around, Now, On Hand.

6000, 11.666666 steps per, You get some rounding, .0143 .02 .03 deg, 12.5143. 

Even with 9000, 25 steps per, You'll still get some rounding, .02 deg. 12.5 is shown as 12.4800.

Now 7200, 36 steps per, seam's good, So dose 1440, 7.2, 144000, 400 steps per.,Hmm.....360 ?

73400, 367 steps per, 12.4986.

NO Hair Splitting Allowed, Chip 

PS: PI are round, Cornbread are square. 

766

General Mach Discussion / Re: Setting up a 4th axis?

« on: July 05, 2008, 11:09:21 PM »

Hi Dave

At least you'll get your feet wet.

Let us now.

Any-Time, Chip

767

General Mach Discussion / Re: Setting up a 4th axis?

« on: July 05, 2008, 08:26:29 PM »

Hi Dave

30:1 (Based on 200 stepper) would give you 200 X 30 = 6000 steps per. 1 turn, .06 deg.'s per step, 16.666666 (steps per.) 1 Deg.

Depending on the Accuracy you need, This may be fine, Not Sure.

Mach can only move to within 1 (stepper/encoder step's), So 1 Deg move 16.666666 step's will be Rounded up to 17 steps, .00000001 to .5. Rounds Down, .50000001 Rounds Up.

Mach keeps track of the Remainders (+'es -'es), To 16 decimal places or more .00000000000000001, If my Memory is Correct.

There applied to the next move to the Nearest 1 step and so-on and so-on............

It's like your other axises, The combination of Stepper's or Encoders count pre. turn and the relationship with Gearing/Ball screw's Ratio's.

You need 10,000 steps (Per.) "Unit" (Inch or MM) to get .0001 Accuracy.

It's All a trade off, Speed and Accuracy, Best I Now.

Hope this Helps, Chip

768

General Mach Discussion / Re: Standard shapes for flame/plasma cutting

« on: July 05, 2008, 06:22:11 PM »

Hi, Jim

Hear thy are.

Chip

769

General Mach Discussion / Re: Setting up a 4th axis?

« on: July 05, 2008, 04:05:39 PM »

Hi, Dave

Torque, Accuracy, Speed, Trade Offs.

If you use a 200 step stepper direct, It's 1.8 deg. per step Accuracy, If it's 10 Micro-step, It's 0.18 deg. per step Accuracy.

Depending on the material your cutting, Holding or Moving Torque could be an Issue.

Most rotary tables are 72 to 1, (72 turns to 1 table turn), Have a Sherline Hear.

Steps-Turns-Accuracy & Reduction Values to consider.

Steps 200 X 72 = 14400 steps, 0.025 deg Accuracy. (Sherline/Rot. Table Type)

Steps 200 X 7.2 (10\72 reduction) = 1440 steps, 0.25 deg Accuracy. (Belt/Geared/Stepper)

Steps 200 X 3.6 (20\72 reduction) = 720 steps, 0.5 deg Accuracy. (Belt/Geared/Stepper)

Micro-Steps 2000 X 72 = 144,000 steps, 0.0025 deg Accuracy. (Sherline/Rot. Table Type)

Micro-Steps 2000 X 7.2 (10\72 reduction) = 14,400 steps, 0.025 deg Accuracy. (Belt/Geared/Stepper)

Micro-Steps 2000 X 3.6 (20\72 reduction) = 14,400 steps, 0.05 deg Accuracy. (Belt/Geared/Stepper)

Hope this Helps, Chip

770

General Mach Discussion / Re: Problems opening Motor Tuning pop up window

« on: July 04, 2008, 06:10:49 PM »

Hi, Raul

I've had this happen from time to time also, As Hood stated, The only way to resolve this is to re-install Mach.

Chip