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Topics - Fred_evans

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71
General Mach Discussion / wizards and feedrate per rev
« on: April 01, 2015, 10:02:10 PM »
Hello chaps
I am using a wizard from the wizard library called idboring

it seems to me that as a default that this wizard initializes feed per minute in the
line  no 1
question. how can i get the wizard to initialize "feed per rev"
when the code is prepared.

72
General Mach Discussion / feed rate changing during machining
« on: March 29, 2015, 11:27:49 AM »
Hello Chaps-
I am trying to learn gcode - please help

Below is a piece of code that I am practising my coding with
the plan is to bore a hole of 11.5mm out to 14.4 mm
Excuse all the remarks- they are just for my own reference

The feed is set to 0.1 mm per rev
A parameter called #1 contains the current cut size and is incremented each cut
at completion of each cut the tool backs off  ,  moves to z home then back
to the x size that it was before backing out. ( this sets the DRO to
the size of the cut just taken so i can see what the size should be)
the spindle stops and the feed pauses so that i can check the size of the part.
I then press "cycle start" and it caries on again.

Note that feed is set to f0.1 mm per rev
But the feed changes of its own accord ( apparently at random downwards)
so that when i press "cycle start " again the feed is now .01  ??

can any of you tell me why it is doing this??
 







% filename is    :-   simple boresinglecut.tap
% program number:-   01001  (program number -put at start of program)   
% Program name    :-   simple boresinglecut.tap
% Program description:-   Makes a single cut in the bore according to parms set
% ----------SETUP STRING (INITIALIZATION)------
m05            (stop the spindle)
g18g21g40g49g61G80g95S1200
%g64            (constant velocity mode)
f0.1
g28
#1=11.5         (bore start dia)
m3            (start spindle forwards)
% start position
f0.1         ( feed o.1 mm per rev)
g0 z19         (start to clear front of boring bar)
g0 x#1         (START POSITION)
g0 z0.5         (move z closer)
g01 z-21      (bore to size)
g0 x[#1-0.5]z-20(backs off)
g53g0z0         (use machine coords to go to z home)
m05            (stop spindle)
g0x#1         (put tool back to show size on dro)
m00          (msg,stop and measure)
m3
#1=[#1+0.5]      (reset diameter parm)
% start position
f0.1         (feed 0.1 mm per rev)
g0 z19         (start to clear front of boring bar)
g0 x#1         (START POSITION)
g0 z0.5         (move z closer)
g01 z-21      (bore to size)
g0 x[#1-0.5]z-20   (backs off)
m05            (stop spindle)
g53g0z0         (use machine coords to go to z home)
m00          (msg,stop and measure)
m3
#1=[#1+0.5]      (reset diameter parm)
g0 z19         (start to clear front of boring bar)
g0 x#1         (START POSITION)
g0 z0.5         (move z closer)
g01 z-21      (bore to size)
g0 x[#1-0.5]z-20   (backs off)
m05            (stop spindle)
g28            (return home)
m00          (msg,stop and measure)
m3
#1=[#1+0.5]      (reset diameter parm)
g0 z19         (start to clear front of boring bar)
g0 x#1         (START POSITION)
g0 z0.5         (move z closer)
g01 z-21      (bore to size)
g0 x[#1-0.5]z-20   (backs off)
m05            (stop spindle)
g28            (return home)
m00          (msg,stop and measure)
m3
#1=[#1+0.5]      (reset diameter parm)















73
General Mach Discussion / constant velocity same as css??
« on: March 29, 2015, 10:14:21 AM »
Literature that i am reading refers to "constant velocity"  Does anyone know if constant velocity
and constant surface speed is the same thing??

regards

fred evans

74
General Mach Discussion / axis moves before spindle ramped up
« on: March 29, 2015, 10:11:19 AM »
Hello Chaps

My programming is a fits and starts operation - sometimes weeks go past before i get back to the machine

present problem is the the axix move starts before the spindle motor has ramped up.

(I am trying to figure out a slow acceleration problem between mach3 and an omrom controller
 cant get the thing to accelerate fast)

But in the meantime i need to make something so i would like to only start the g0 command
when the spindle gets up to speed.

all help gratefully accepted
regards
fred evans

75
General Mach Discussion / display parameter value
« on: March 02, 2015, 12:29:51 PM »
Hello Chaps--
I am using parameters in a subroutine
Is there a way of finding out or displaying the value of the parameter?

best regards

fred

76
General Mach Discussion / calibration diameter or radius
« on: March 02, 2015, 05:41:07 AM »
Hello Chaps
I have calibrated My x axis with a dial indicator to an accuracy of 0.02 on a move
of 8mm.  g0 x0
              g0 x-8

When I am turning it appears to be measuring a much longer cut.
I am turning in diameter mode but is seems to be measuring in radius mode

can anyone suggest a solution. I think it is working in radius mode and therefore
doubling up on the depth of cut??

My macro gets depth of cut of 2mm ( machining plastic) and then deducts
( depth of cut * 2 ) every time it goes through the subroutine to get the
next diameter for start of cut .
regards

fred
 

77
General Mach Discussion / stepper motor speed
« on: February 18, 2015, 02:31:19 PM »
Hello chaps.

I do not have any specs on the stepper motors that i am using and i dont know what
what speed they are doing when i am at a fast feed  (G0).

This is the question.
If I connect up an odometer to the shaft of the stepper what gcode can i
give it to make it go full speed.

Maybe a stupid question - but all suggestions are sincerely appreciated

regards from south africa

fred evans

78

Hello Chaps

I am using a lathe with Mach3. I use screen 1024.lset ( the entry
level screen )

I have wired up a stepper motor to drive the tailstock  screw.

The ides is to use the tailstock for drilling  and  holding  the
rolling centre when machining  long shafts.

For drilling I dont think it will be  important ( for me at this stage anyway)
to be precise with dimensions and depth . All i really need at the
moment is to be able to put some code in which will drill a starting hole
in a solid rod before boring.
Again - for holding the rolling centre on a long shaft - will manufacture a
spring loaded rolling centre which will apply spring pressure to the
rolling centre to allow for small discrepancies in the shaft lengths.
The rolling centre will have a spring controlled travel of about 5 mm which
should be enough for what i want to do 

I would appreciate advice and suggestions on doing the setup such as
which axis to use , which switches to activate , etc  and most importantly- where to
find the setup details in the operators manual

best regards and many thanks in advance

fred evans



79
General Mach Discussion / code to see if homed
« on: January 25, 2015, 12:56:37 PM »
Hello chaps

is there a word (or a way ) to check if the machine has been homed?

regards

fred


80
General Mach Discussion / parameter syntax
« on: January 25, 2015, 12:42:56 AM »
Hello chaps

I am doing a bit of coding with parameters and having trouble getting mach3 to read them

I think it is a syntax error.
firstly -do the normal operators ("+","-","/","*') work on parms??
secondly what about boolean ?
What about "<" and ">" (smaller than and bigger than)
thirdly where do the brackets go?

this is one of the lines i am not getting
Plain english says  #5  is equal to #3 minus 2 mm

coded as follows   #5=#3-2  doesnt work ??

please help the manual is very brief on this subject is there ant other literature?

regards

fred




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