Messages

471

General Mach Discussion / Re: Threading Wizard

« on: August 13, 2017, 06:19:19 AM »

Is it possible to use two cards one USB and one parallell and connect the index sensor to  the parallell card?

I do not know if that  will work.

RICH

472

General Mach Discussion / Re: Turning wizard says 0.75" but part ends up 0.5" diameter

« on: August 12, 2017, 09:17:26 AM »

Dave,

Help, What am I doing wrong?

Frankly, you don't understand a lot of the  basics relative to lathe, no big deal you just need to know before you go. READ AND UNDERSTAND what is in the Lathe Manual.
I'll post some info to get you started, but first let me clear up some questions.

What is normal backlash?

There is not such thing as "normal". You have what you have for a system so know what what it is  and either fix it or live with it. Backlash does work, but a software solution is not the ideal fix, it's just a matter of degree of backlash.

what number(s) is placed in the backlash compensation screen and how do I determine them?

Look in Members Doc or do a search as ther is plenty of info posted on what to do. The amount is the unit value  required to remove non-movement of the axis.

BACKLASH SETTING 50-50-50 RULE
http://www.machsupport.com/forum/index.php/topic,29149.msg204717.html#msg204717

How to check backlash
http://www.machsupport.com/forum/index.php/topic,12513.msg81002.html#msg81002
 

Could this be affecting it.

Final part dimensions, yes, but not what is happening as you describe.

Are there any manuals describing the Wizards?

No.  You need to just play with them. Suggest you just have no work offsets active and set Machine Cooordinates to 0,0 and home is same as MC 0,0. Then use the wizard in diameter and radius mode and post. Keep the amount of cuts down as it makes understanding the code easier and see the results via dry running.

Is Part Zeroing for parting off the workpiece

You first reference the machine and then define the work piece location relative to home.
Need to undestand how to setup a job.

Why? I though zero on lathe is center of object being turned.

X axis location never changes and Z will vary. Movement of X can be different depending on front or rear lathe and where it was referenced. See attached file.

When zeroing a part in the lathe do you place cursor on Progdata so LED is on

DRO's indicate axis position depending on Coordinate system being viewed.
See attached for a understanding.

RICH

473

General Mach Discussion / Re: Jobs being Ruined (only just started)

« on: August 11, 2017, 06:34:29 AM »

Chris D,

my reply got sensored because I spelled "Poop" the adult way, too funny.

Wasn't me, but, you will find this site to be of higher than normal  standards. Checked my politically correct dictionary and could not find  any
of the words commonly used in the adult world for doo-doo.

Hmm ........ maybe there is a  trick ....if it's not in the dictionary then it may get sensored.
 
RICH

474

General Mach Discussion / Re: Jobs being Ruined (only just started)

« on: August 11, 2017, 06:12:48 AM »

 

RICH

475

General Mach Discussion / Re: V Carving Quality - possible problem on entry and exit points?

« on: August 10, 2017, 08:22:07 AM »

A couple of things to consider:
1. Z backlash  - look at the code and see how deep the V is going into the material.
    Then calc what .004" difference would make in the radius of the cut.  You have what
     you have, so live with it or fix it.
2. Material - different material will machine different so don't expect perfect results
    from an inferior  material.
3. Spindle runout - yes you have some, just a matter of degree and depending on movement
    adds some to the problem.
4. Setup and how you define the machining also affect the final results

V carve probably provides for the proper movements in the code and Mach will implement
the code properly. If you want to have near perfect lettering  your machines system must be capable of producing it and setup properly. It's that simple.
RICH

476

General Mach Discussion / Re: Using a Sevo as a Spindle and an Axis

« on: August 03, 2017, 05:10:54 PM »

Any Suggestions?
I have not followed the evolution of the SS in Long time. I believe that it supports the swapping of axes.
Start reading up on both the VB required and SS information.

In mean time someone with more detailed experience may reply.
RICH

477

General Mach Discussion / Re: Using a Sevo as a Spindle and an Axis

« on: August 03, 2017, 07:10:16 AM »

the only way I can make this work is to use the same pins for both and simply disable or enable the one I want to use

So the software controller, namely Mach3, can instruct output to the same pins for one use only.
It's either a spindle or the  4th axis C, thus, when you manualy enable / disable Mach can approriately control output to the pins. Should be able to use macro's using Swap Axis to switch back and forth if your using a PP. If external controller it must support that command.

Lets see what other users suggest,
I would suggest you post some more info........ xml file / drive  manual / mach3 version/ hardware etc.

RICH

478

General Mach Discussion / Re: Pocket widths different on x and y axis

« on: August 02, 2017, 07:47:13 AM »

Suggest the following:

1. Calibrate each axis so the steps per unit are correct. The calibration moves are always with backlash removed.
    Consider the following:
    - based on the longest travel
    - check calibrated steps in different sections of the bed. Idealy doing a profile check of each axis  ( both directions )
       will show the variations of the axis. Profiling gives you data for how accurate YOUR system's positional  accuracy is.
2. Check backlash for each axis. Again it can vary, so check along different spots of the axis. Idealy backlash should be minimised.
    You can live with it, use backlash compensation, or make modifications to get rid of it.

Spend the time doing the above first, even though it takes time.

3. Find max velocity and acceleration settings for the machine, reduce max to provide headroom for actual machining.
 
Now go on to step 4.

4.( No use rambling on if you don't do 1,2,3 first !)

RICH

479

General Mach Discussion / Re: Trying to create a new profile and shortcut for Mach3 Turn, not cooperating

« on: July 30, 2017, 04:47:15 PM »

Just  copy of the 1st xml file and rename the copy to a different name.

RICH

480

General Mach Discussion / Re: First post: Mach3 machine and workspace offsets, auto home, and auto tool offset

« on: July 29, 2017, 02:31:41 PM »

my machine zero to plate offset isn't as repeatable as I'd like

CNC is only as repeatable and accurate as YOUR machine and how one sets up for a job.

Why not address / fix the machine so you can do what needs to be done?

RICH