Messages

1

General Mach Discussion / Re: moving hove from lower left to right.

« on: February 21, 2019, 08:09:29 AM »

You can define Home position anywhere you want it to be.
The attached shows typical axis movements for a mill. See the link below and read pages
2,4,5 in the workbook.
https://www.machsupport.com/forum/index.php?topic=24580.0

Also read the the Mach Manual.

RICH

2

General Mach Discussion / Re: homing sequence (G28)

« on: February 10, 2019, 05:57:58 PM »

Start with simple G28 moves and note what you thought it would do and what actually happens.
Note also the modes your in and if there are work offsets etc.

Now go play some........ lets us know what your score is as to what you thought would happen compared to what actualy happened. 

RICH

3

Show"N"Tell ( What you have made with your CNC machine.) / ATTACHMENT FOR PRECISOIN BULLET SEATING

« on: February 10, 2019, 08:43:24 AM »

A die attachment for easy / accurate bullet seating adjustments. Also has info on gauges worth making.

See attached file.

RICH

4

General Mach Discussion / Re: feed per rev versus feed per minute

« on: February 09, 2019, 08:58:58 AM »

Make sure you are in the right mode ie; G94 or G95.

How close is your Kernal speed as compared to selected kernal speed in configuration?
- When you run the driver test in Mach3 it will show actual your actual Kernal Speed.
   Some users have a kernal speed indication via a pulse frequency DRO on the diagnostics screen.
   The closer the actual kernal speed to selected kernal the better.
- RPM is real time but there is a lag in what the DRO shows.
  The rpm should not fluctuate, maybe 1 or  2  rpm, but, if the rpm varies the feedrate will vary.
  You should check your actual rpm......Mach3 rpm indication is more accurate than a lot of rpm indicators!

The above is for Mach 3, but I don't use Win 10 / 64 bit,  and don't know what version you are using, so
can't speak for that system.

BTW, There is a big difference in a visual movement of the axis for an feedrate between .2 and 1.5.
           Try G1 Z...... F ( value .01 to 1.5 ) to realy get a visual flavor of actual movement.
           You would plainly see it. Mach tries to maintain feedrate via rpm sampling.

RICH

5

General Mach Discussion / Re: homing sequence (G28)

« on: February 08, 2019, 05:29:57 AM »

Fred,
G28 X ..... Z..... axis will move via an the intermediate point. When you don't specify an intermediate point by just coding
G28 the current point is considered the  intermediate point. See 10.7.8 in Using MACH3TURN manual for definition of the
g codes ( which can be confusing ).

I strongly suggest you actually spend some time playing with the command using singular axis and combination of both axes when using G28. The actual axes movement can get confusing quickly so be care full.

RICH


 

6

General Mach Discussion / Re: Lathe making moves not in Gcode

« on: February 06, 2019, 07:54:27 PM »

Vince,
Cute little spark plugs your doing............... ,

The code you posted does exactly what the program called for, except it never changes the tool because you
need an M6 to do whatever you want to do for the tool to be changed, thus it just runs through the complete program
program and ends on X0.020 Z0.005.

Don't know how you are setting up the job, even the modes you are in, as the program just seemed incomplete.

Now you say you inserted a M0 and removed the T2 and the program stops.
So the controlled point would ne located per the code  G0 X1.000 Z-0.100.

RICH

7

General Mach Discussion / Re: Lathe making moves not in Gcode

« on: February 06, 2019, 07:05:19 AM »

Post the complete gcode file.

RICH

8

Mach4 General Discussion / Re: RPM variation with G76 cycle use

« on: February 04, 2019, 08:33:19 AM »

Have a good reading / study of Threading On the Lathe Mach3 write up which can be found in members doc's.

Can't be of any help relative to Mach 4.

RICH

9

General Mach Discussion / Re: Lathe tool table

« on: February 04, 2019, 08:23:47 AM »

Vince,
I use a custom screen set which has numerous changes done to the Three Page Lathe Screen below.

Three Page Lathe Screen
https://www.machsupport.com/forum/index.php?topic=13548.0

I created a seperate Tool Setup page and on that page all tool probing is done. I use a simple tool setter
and probe to the appropriate surfaces. Additionaly I can probe to find lathe center, adjust probed offset
values, set a tool change location, but most importantly any lathe tool can be probed. By the way, a tool
setter does not need to be mounted in the chuck as it can be located anywhere as long as you can touch
off to it.

Additonaly that page allows for manipulation of the tool table such that it can opened/ saved / exported /
imported / reset / and recall a master tool table.

The screen set has two other pages which probe, one manualy and another automaticaly.
The manual one was done so I could do something quick and dirty to generate code, find points
along a profile ( whatever ) using a probe and create gcode or a dxf file. The other page is accuarte probing
to find points and generate a cad drawing based on the points. Very easy to duplicate a profile of something
with min amount of work. It beats scanning or the "bed of nails" approach!

Spent a lot of time, back a few years ago, reviewing anything having to do with probing and lathe screen sets
and just applied the best of the best to how and what "I" wanted.

RICH

10

General Mach Discussion / Re: Mach3turn tool table is making me crazy

« on: February 01, 2019, 06:48:46 AM »

John,
I use probing for touching off  "ALL"  tools and use a simple tool setter.  Find that it is the most accurate and repeatable of all the methods. I do not double probe the touch off but rather probe at  a slow rate eliminating the over travel. I use a few macro's but the button scripting takes care of what is needed to be done.
 
By "ALL" tools I am meaning things like reamers, drills, whatever and a few buttons provide for any changes required. To touch off any lathe tool you need 4 surfaces / references when probing.

I use the master tool concept such that tool one is used to define all the other tools. It is not used for machining and it is just a piece of 1/2 round carbide and the sides are parrel and the face  is perpendicular to the sides. Once the tool table is populated any tool can become the master tool. If tool #1 is broke and needs to be replaced then you can use say tool 10 to replace tool #1 with the proper offset.

My tool setter is home made and cheap! Simply it is a piece of ground round with a 1" micrometer standard on the end of it. The mike standard is mounted on the end of the round, centered and the flat surfaces parrel to the round.

I just put electrical tape on the round so i can probe to any of the mike standards four surfaces.
Now you say .....tape on the ground round and he is accurately finding offsets.....I hear it now...give me a break, Rich!
It matters not what is holding the tool setter, you must center it using an indicator 0.0001". The tool setter just provides a common reference X Z plane for the tool  to touch off. You need that to have "0" runout in the X direction and the plane can be slightly above or below lathe center. My three jaw creates a small runout on the tool setter, so it's easy to center the setter on lathe center.

BTW, I don't use home swiches, always start by using the tool setter to find lathe X center via probing. Then manually define a  home and tool change location and both are at the same location (KISS). Then define the G54 Work offset. I use a quick change and probably the most number of tools used in one machining operating was around 8 tools or so.
 
RICH