Messages

201

Mach4 General Discussion / Re: using feed per revolution

« on: January 19, 2015, 05:00:23 AM »

sorry my typo-- should read 0.5
regards

202

General Mach Discussion / Re: lack of power when using invertor ?

« on: January 18, 2015, 10:52:14 AM »

Hi Guys--

Not to be too critical- and sincerely appreciative of all the comments and suggestions
 but we are getting away from the subject

my original question revolved around :-

>>"It seems to me that the new motor does not have the power that the original
>>motor had. Perhaps it is just my imagination but for example turning 50mm dia
>>delrin rod at 1500rpm i can only comfortably take a 0.5mm cut depth  at a feedrate of
>>0.35 per rev .
>>Does this sound about right  ??
>>when I used the machine with the 750 watt motor i seldom used more than
>>900 rpm because the gearbox was to noisy. but still at 900 rpm i could take a
>>reasonable cut "


Perhaps there is someone out there who can comment from experience on another
machine whether this is indeed a realistic expectation ?

203

General Mach Discussion / Re: what is the oldest post in this forum

« on: January 18, 2015, 10:22:50 AM »

Hi rich havent spoken to you for a long time--
well the last time i tackled this project was about 3 years ago--
at that stage i got through about 4 pages per session.
(I only look at the headers and read interesting posts).
dont remember how far i got . in fact i dont remember what i had for
breakfast this morning??
regards

204

General Mach Discussion / Re: " no spindle feedback seen in G95 units/rev mode

« on: January 18, 2015, 10:06:09 AM »

thanks hood- i will check

205

General Mach Discussion / " no spindle feedback seen in G95 units/rev mode

« on: January 17, 2015, 11:17:33 AM »

" no spindle feedback seen in G95 units/rev mode "
Hello Chaps

what is the cure for the above error message??

Is there a published list of error codes that I can access ?

regards

fred

206

General Mach Discussion / Re: lack of power when using invertor ?

« on: January 17, 2015, 10:12:26 AM »

I think i found something

I obtained a rev counter and when the spindle is turning at 1200 rpm
the motor is only turning at 500 rpm.
 
If I crank up the speed using S1600 i get a message "set to max - to fast for the pulley?? ( or something similar)
Is there somewhere to tell it what the pulley ratio should be.
regards 
While i search the forum for pulley ratio
fred

207

General Mach Discussion / Re: what is the column next to "subject"

« on: January 17, 2015, 10:04:52 AM »

Hahahahaha!!

Has this got anything to do with Mach??

208

General Mach Discussion / what is the oldest post in this forum

« on: January 17, 2015, 07:13:07 AM »

Hello Guys
I dont know how to address this message to the forum administrator- so forgive me for
posting here.

I would like to start at the beginning and glance through all messages from the beginning
of this board.
what is the first message in the forum and at what date.
Then having read it i will mark it as read and can i then configure the board to only display
unread messages in future
regards fred

209

General Mach Discussion / Re: lack of power when using invertor ?

« on: January 17, 2015, 07:05:57 AM »

Ok Guys - please bear with me while i try to give more info.

Thanks GEH for your expert observations. firstly - your first post - " motor slowing down with deeeper cuts"
yes that is exactly it. If I take a deeper cut or a bigger feed the motor will not turn the chuck.
In my opinion your "low motor torque " describes the issue.

Regarding the quality of the inverter- I wouldnt describe it as a "low cost chinese"
It is an omron type 3g3MX2-A  made in jAPAN. I note your comments about the motor setup
and i will address these to the Omron serviceman on Monday . I really dont know if it is v/f mode or not.
- but understanding your speed/torque I will check the motor settings again and try and work through
gearing for more torque

The motor plate says 3phase induction motor 1.1 kw 1400 rpm 50 hz  (am i presuming correctly that this is
2 pole motor ?)

But the unanswered question still is . At 1.1 kw am i expecting to much for a cut ( in plastic ) of bigger than
.5 MM ?? just looking for opinions from others.

You chaps on the forum . Cutting 50 mm plastic at 1500 rpm what depth of cut do you achieve and what
KW is you motor.
In my engineering shop of course i have much bigger machines - similar size and power to Colchester Truimph
and to take 7mm to 10mm roughing cuts are not unusual  . At 1500 rpm cutting PTFE or UHMWPE the
streamer of swarf will land about 2 to 3 metres away which is what we want .

210

General Mach Discussion / Re: to remember the position of the home switches

« on: January 17, 2015, 06:26:09 AM »

Thanks Hood - Its clear now
fred