Messages

1061

Promote and discuss your product / Re: Free G76 Macro Helping program for Mach3 Turn

« on: January 27, 2016, 09:15:14 AM »

And for the ACME or the Tr ... trapeze threads:  Perhaps it would be possible to cut a TR with 30° flank angle and a sharp 30° tool, but for that, I'd have to change the M1076.m1s macro on a fundamental basis to cut to the right depth in the first step and then wide it in pitch direction. Possible, but for an clean implementation, the GCode Interpreter of Mach3 has to be changed to add a new variable, and that is - see above - not possible as much as I'd like it to - think of the bugged T-Word. With the right cutter, it is only the depth to respect. So, I think it's going too far. If a change in Mach3 would be possible, I'd do it, but as it now looks, a clean solution is impossible.

No problem on not doing the Acme as many folks probably will never use it.
All one needs to do is  use the alternate flank cutting with a sharp V tool but define the proper X end in the Simple Threading Wizard.
The program doesn't know what tool you are actually using and thus it stops the cutting at x end. The tool will just alternately
remove material based on pass depth, doing one side and then the other and stop at Xend. I will add that the cnc lathe needs to be accurate
as it is the equivalent of doing multiple start thread.

I though I had the ASME Standard for ACME thread somewhere but can't find it! Only have ANSI / ASME B1.20.1

Thanks what you doing as I appreciate it,

RICH

1062

General Mach Discussion / Re: Need Help figuring out PROGRAM/MACHINE/PART X&Z SET ZERO ?

« on: January 27, 2016, 08:45:19 AM »

mpix00,

I have attached a some info from a rough write up for my lathe screen set. I think it will give you some basics you need to
understand, BEFORE, you start trying use your lathe.

I think that most new lathe users get confused as they quest to start trying out their new lathe.
Here is some simple thinking that can become repeatable / habit forming such that things turn out correctly.

1. Define Machine Coordinate (MC) Zero - the controller now knows where  YOUR machine zero is.
2. Now define where the stock /  part is to the controller. The part  is usually some distance away from MC=0 but it is always
   on lathe center. That is what Part Coordinates (PC) are. Now most simplistically, you can make MC=PC=0.
   There will be no work offsets and the MC & PC coordinates will be the same.
3. Generate the gcode to cut the part such that the code is based on the center and  face of the part.

Make sure when you use the wizards that inputs are correct for the lathe mode you have defined. ie; Dia or Radius mode.

And lastly, hate to say this,  STUDY the manual.
  
Have Fun,
RICH

1063

Promote and discuss your product / Re: Free G76 Macro Helping program for Mach3 Turn

« on: January 26, 2016, 09:17:20 AM »

No special name for the #0 to #12. See the attached chart for what belongs to UNC and UNF.
These size threads are used a lot by a lot of folks. Forget about cutting  internal threading for them.
The tolerance on these small sizes are very tight.

Just for info, the tolerance on pitch for Mach threading was based on comparing the pitch over an actual cut length.
There is a chart in the Threading On the Lathe write up (page 26).

I will get you data for the Acme threads and NPT. 

Some practical info on the Acme threads:
- It takes some HP to cut the thread, and a wimpy lathe is not going to do it.
- Most folks will use proper insert ( single or even chasing) and most amateurs will never grind a cutter for it properly.
  ( before someone barks! ) the generated code must assume a properly ground cutter and accurate enough cnc lathe to do the work,
  thus, it's not about the nut goes  on and life is good....enough said.

So what code is generated depends on what method and tool you will use to cut the Acme thread.
Maybe just provide another Tool input / choice for something like: Sharp V  or  Acme Insert.
Just a few thoughts for your consideration.

RICH

1064

Newfangled Solutions Mach3 Wizards / Re: Mach3 Simple Thread Wizard only wants to cut in one direction. HELP!

« on: January 26, 2016, 08:06:05 AM »

Install the later version as threading was broke in early versions!

I may suggest you have a look at the write up Threading on the Lathe - Mach3 Turn which can be found in Members Doc's.

BTW, when using the wizard do the calc  as that the will check that the configuration as compared to rpm input such that
you don't exceed you vel & accel settings.

RICH


RICH

1065

General Mach Discussion / Re: Help Can't get steppers to move!!!

« on: January 26, 2016, 07:57:07 AM »

I haven't looked at all the info, but quickly read reply 7.

When the controller power supply is  turned on the steppers should lock up. Current has been applied to the motors and thus the field is holding
the rotor in place  /  since the motor is not being pulsed. So you have max holding torque and that is based on the drive current setting.
Now some drives allow for reduced current to the motor when stationary, and as such, the drive will reduce the current, thus you can actually manually
turn the shaft. ( torque reduced and you can easily make it skip ) When pulsed the current is increased based on the current setting. On some drives this current reducing can really SUCK when implemented during actual machining.

Again, haven't looked the drive  info ( multitasking at the moment!)........,

RICH

1066

Promote and discuss your product / Re: Free G76 Macro Helping program for Mach3 Turn

« on: January 26, 2016, 06:48:02 AM »

Stephan,

Can you send me a personal message with your email address. I have some reference material / standards, but, I can't post them for the general public.

RICH

1067

Promote and discuss your product / Re: Free G76 Macro Helping program for Mach3 Turn

« on: January 25, 2016, 11:13:35 AM »

COMMENTS:

1. Would be nice if the following fixed sizes were included in the
the Thread Spec:
   #0 to #12 UNF
   #1 to #12 UNC

   Also American National Standard Taper Pipe Thread
   1/16 to 2 NPT.

2. If leaving the range of the thread tables......
   What kind of unpredictablity may happen?

3. What if one wants to cut a Class 3A thread?

4. Here is something to consider, that's different / not found in most of these
    kinds of helpers and works nicely if you have an accurate lathe:
    Use Cut type 1, reduce the depth of cut, and you can end up with a nice Acme thread
    that can be done on a less powerfull lathe with a sharp v tool!

5. I do have a concern, I am wondering if fooling with the macro or whatever is going to screw up the threading
    .........as the threading cycle was designed when fixed. Spindle slow down, averaging, and sampling may be affected.
    Need to re-read  your notes more than just a quick read. Maybe Newfangled didn't want your help for an undisclosed reason.

Just some feedback,
RICH
 

1068

General Mach Discussion / Re: G76 Lathe Theading Problem

« on: January 25, 2016, 11:07:08 AM »

Jamie,

I take your last reply as a NO.
I wish you well in finding more insight into your problem on your owne.

RICH
 

 

1069

General Mach Discussion / Re: New to CNC and need some assistance please

« on: January 24, 2016, 08:26:31 PM »

Chelsey,

- In the upper part of  Mach screen, click  Config
- select System Hotkeys Setup from the drop down
- in the Jog Hotkeys, click the axis of interest, you will be prompted for the key you want to use

Next:
- Config>Ports & Pins - the A axis needs to be enabled, check that it is and that it's configured.
  Note that A is usually Angular and in Motor tuning the steps per unit  are steps per degree.

Next:
- Config>General Logic screen, third box on the left, tick the box next to A axis is Angular

BTW,
Can't offer any help on the 6040Z.

RICH

1070

General Mach Discussion / Re: Help Can't get steppers to move!!!

« on: January 24, 2016, 08:07:46 PM »

Provide a link for the steppers you bought, the drive you bought, and the break out board.
Post your xml file you using so we can have a look at your configuration.

Someone will take a look at it all.

When you jog does the axis DRO show movement?
Is the estop flashing on start up?

RICH