Messages

121

General Mach Discussion / Re: off topic- but maybe someone can help

« on: October 01, 2016, 09:28:05 AM »

Yes thank you for the interesting video but my problem is not with sensing the
speed of the spindle.
I have an optical "eye" fitted to the spindle and this is working correctly ( I have checked the
speed with my mechanical tachometer and it is good).
 The problem is that if I set the speed to S1500 ( for example ) by including S1500 in the
"general config" initialization string- then when i toggle the "spindle" toggle the speed that
the motor turns is nowhere near 1500
I suspect that there should be a parameter in the inverter setup which will determine the Hz that
it should be sending to the motor.
any more suggestions
Fred

122

General Mach Discussion / off topic- but maybe someone can help

« on: October 01, 2016, 03:13:46 AM »

Hello Chaps,

Inverter setup problem

Sorry to post off topic- but it is saturday here and commercial outlets are all closed

I have a lathe running mach3 and the speed is being controlled by an omron MX2 multi function inverter.
I cannot figure out how this inverter works because i am not an electronics fundi.

The problem is that when i switch mach3 on and toggle "spindle on" the chuck turns very slowly
( about 50 rpm) and when I run a wizard the speed does'nt translate to the motor correctly.

I suspect that there is a parameter within the controller that is not set correctly.

My initialization string ( under general config ) call for S1500 and the "motor config" is set for max 1500
min 300 .

Am I correct in assuming that without any code loaded if i toggle" spindle on" then the motor should run at
1500rpm ?

I have an "eye" which reads the spindle speed correctly but the "S" dro does not show the correct spindle
speed.

Help will be appreciated

Fred Evans

123

General Mach Discussion / Re: 3rd axsx on lathe

« on: May 17, 2016, 03:44:30 AM »

so simple !! thank you- sorry for the hassle

fred

124

General Mach Discussion / Re: 3rd axsx on lathe

« on: May 16, 2016, 08:38:05 AM »

thanks very much-- especially for the link Rich !
( for my future reference how did you find the link or do you have it on record? )

many thanks

fred

125

General Mach Discussion / 3rd axsx on lathe

« on: May 15, 2016, 12:33:46 PM »

Hello chaps--
I asked the question before but cant find the thread ( sorry )
I am using mach 3 on a small bench lathe and would like to set the tailstock
as the 3rd axis ( for drilling, centering and other odds and ends).

Please point me to the instructions for doing this.

I am using the standard simple screen that is the default-- and maybe now is the time
to upgrade - all suggestions and hints  gratefully recieved

regards

fred

126

General Mach Discussion / Re: CSS - in meteres or milimeters

« on: May 01, 2016, 08:52:49 PM »

thanks for all the input--
I am using CSS and it is changing the speed as the diameter that I am turning is reduced and this is the result that I am
working through. this is making the chip problem a little easier - so i think i am on the right track.
I need to put this issue on back burner because another project is calling for attention and i tend to oill the wheels that
squeack the loudest. If there is any change i will post the detail when I get back to this project again
thanks everyone
regards

fred

127

General Mach Discussion / Re: CSS - in meteres or milimeters

« on: April 27, 2016, 11:13:21 AM »

Thanks everyone--

does css work on mach4 ?

128

General Mach Discussion / Re: CSS - in meteres or milimeters

« on: April 27, 2016, 04:04:50 AM »

Hood your experience and knowledge are always respected and gratefully acknowledge.

To elaborate on my present interest in CSS this is what i am doing
I am not using CSS as a control on facing the ends but  rather I want to control surface speed
along the axis as the diameter of the part reduces while machining the OD smaller.
I am machining nylon rods ( about 250 have to be done) from square blocks plus minus
130  X 130 X 280 long. I am machining the blocks down to 68 mm diameter X 250 long.
As all arel aware when machining plastic - there is a major problem with keeping
the swarf under control.
I would like to have the job run itself with minimal supervision so i have rigged a blower
and vacuum arrangement to remove the swarf close to the tool tip.

It works well except that as the surface speed at the cutter tip changes so the swarf
stream also changes direction and moves away from where the swarf control apparatus is
located.

I have found that a 900 rpm on 100mm dia. the swarf goes just where i want it.
However at 900 rpm on a diameter of 70mm ( much slower surface speed)the
swarf flows in a different direction. ( in fact around the tailstock rolling centre where
it fouls the centre and messes with the finish on the last cut)

Therfore I would like to have the surface speed at the tip the same from diameter
of about 120 right down to diameter 68

( sorry about being so longwinded )( maybe it is a sign of advancing age?)

all sugestions will be appreciated.

( please dont over look the meters and mm question ion the beginning)

regards
fred

129

General Mach Discussion / Re: CSS - in meteres or milimeters

« on: April 27, 2016, 03:41:31 AM »

thanks Chaps--

so when I use css the "S"
 is entered as surface speed inmeters per minute? (Not in mm per minute)

many thanks

fred

130

General Mach Discussion / CSS - in meteres or milimeters

« on: April 26, 2016, 08:58:00 AM »

Hello Chaps-
Mach 3 on lather
I have units set as metric.

Setting CSS via gcode is G96 S?

Is the S word in metres or in mm?

My product cuts nicely at 900 rpm on a diameter of 100 mm
Is the following logic correct
100mm X PI= 314.16 mm per rev.
900 rpm will mean 314.16 X 900 = 282744 mm per minute
= 282.744  metres per minute
the block will read G96 S282.7   ??

Next thing is feed per rev that was set by G95 respected??
 
Thanks in advance

Fred