Messages

11

General Mach Discussion / Re: Charge Pumps

« on: June 19, 2007, 01:46:16 AM »

Sid,
I am using Linear ball bearings on Hardened shaft.
My lead screws are 16mm diam 2.5 mm pitch
IWith the power off I can turn the lead screws with my fingers.
When jogging there is no variation  in the sound from one end to the other, that would indicate binding.
The lead screws have a ball  bearing on each end.
It seems to loose the plot on sharp changes of direction.As in PhotoVcarving.
9 times out of 10 it will mill a rectangular pocket without missing a beat, and the same goes for cutting a circular pocket.
I did try slowing right down to 500 mm but the motors got very rough.
Increasing the acceleration did improve things but waiting for it to change direction was like watching grass grow.


Bill

12

General Mach Discussion / Re: Charge Pumps

« on: June 18, 2007, 09:13:42 AM »

Hi Sid,
I have just rebuilt my gantry router to increase table size.
I am cutting AIR at the moment.
My power supply  is 32 volts to the board
All the settings on the HCNCPRO board are within the specs for the board.
I have the Vrefs set to .36 volts
Motor tuning is 1000mm per min and acceleration at .4 to .6.
Lead screws are 2.5 mm pitch.
200 oz Hobby CNC motors.
Jogging is smooth in all directions.
Run a routine and steps are missed. I can actually hear the motors change when steps are skipped.Not always in the same direction.
After a sound change I stop the machine and hit the GOTO Z and it will be up to 15 mm out.
I realiise this could be a tuning problem but the machine worked OK for a few months at these approximate settings.
The one consolation , a friend suggested that I sell my PhotoVcarves as abstract art,genuine one offs.

There is a funny side to everything, I am still looking for one.

Bill Files

13

General Mach Discussion / Re: Charge Pumps

« on: June 16, 2007, 09:59:59 AM »

Another after thought,
I have 200oz steppers.
My computer is ACER 1.6  CPU
750 meg Ram .
Not a monster but is it big enough for Mach3.

Bill Files

14

General Mach Discussion / Charge Pumps

« on: June 16, 2007, 09:54:25 AM »

Hi Guys,
Will a charge pump in Mach3 be any help in eliminating missing steps.
I am using Win 2000 and the hardware is HobbyCNC Pro board.
If so are there any macro's around that I could "borrow" that would fit my setup.

Bill Files

15

General Mach Discussion / Re: Simple MPG hookup to Mach3

« on: June 16, 2007, 09:38:24 AM »

Hi Chip,
Thanks for the response.
I checked the pin specs on the encoder and yes there is, 0v, 5v, A, B, * pins
I have made the housing and the wheel has 50 detents.
The encoder is HP HEDS-5500--H14.
I will install 3 buttons on the control panel for changing Axes and use key grabber to activate them.
CNC is complicated enough so I use the K.I.S.S principle where possible.

RGDS

Bill Files

16

General Mach Discussion / Simple MPG hookup to Mach3

« on: June 14, 2007, 09:11:47 AM »

What is thi simplest way to conect an MPG to Mach3
I have a HP HEDS-5500 H14 encoder with 5 pins.
Do I need some form of interface or can this be done directly through
my Hobby CNC PRO board.

Thanks
Bill Files

17

Competitions / Re: ******Guess and win a G100 Grex******

« on: May 24, 2007, 07:02:13 AM »

I figured that the number of chips has some connection to the resolution of the image,
So  calculating  bytes and converting to bits  I have  concluded there is
2,425,494 chips

Bill files

18

General Mach Discussion / Re: cross hairs move in wrong direction

« on: January 14, 2007, 07:36:32 PM »

Many thanks . the problem is solved. 

19

General Mach Discussion / Re: cross hairs move in wrong direction

« on: January 14, 2007, 07:12:13 AM »

Hey Willie,
   Did you reverse the motors in config, homing and limits? Try that and close Mach. Open Mach back up and see if the changes stick. Also, where do you have zero set at on your model? The above will change the way the machine moves.


Brett

Thanks for the reply Brett.
I did reverse in the config, and did not restart Mach however since your reply I tried this and still did not solve the problem
I also tried reversing the motors on the board to no avail .
Where I am at now, Zero is the front left hand corner or bottom left hand corner.
Referencing goes to this corner, The cross hairs now move in the same direction as the tool. So far so good.
The only anomaly is the curser keys are the wrong way. Left cursor moves to the right and the right moves to the left.
you might say It's programmed for a CRASH

20

General Mach Discussion / cross hairs move in wrong direction

« on: January 14, 2007, 05:37:23 AM »

I have just completed my first gantry router.
I am using Mach3 and HobbyCNC controller.
Everything worked first time except the cross hairs move in the wrong direction when jogging.
I just spent the last 12 hours setting everything up and maybe I am a suffering mental fatigue.
I tried many things, even reversed the motors, but nothing works.
It has to be something simple, but what?

WillieCNC