Messages

171

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.

172

General Mach Discussion / Re: feed rate changing during machining

« on: March 30, 2015, 07:01:21 AM »

Thank you I will try this tonight
regards from south asfrica to tennesee
fred

173

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)

174

General Mach Discussion / Re: axis moves before spindle ramped up

« on: March 29, 2015, 11:10:10 AM »

thanks gary--

175

General Mach Discussion / Re: constant velocity same as css??

« on: March 29, 2015, 11:08:35 AM »

Thanks Rich-- makes sense in the context that I was reading it
so constant velocity could mean same velocity around corners??
while css refers to the speed of the cutting edge on a facing cut

If i am using CSS and am machining a rod on the outside diameter taking
multiple cuts will the spindle speed adjust as the rod diameter gets
smaller after each cut??
 

176

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

177

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

178

General Mach Discussion / Re: display parameter value

« on: March 03, 2015, 04:07:25 AM »

thank you--

179

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

180

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