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General Mach Discussion / Re: New Leadscrew, need settings
« on: December 22, 2010, 10:34:05 AM »
Hi Hood
Just a  look on the side of the motor,

dont think this will help but here you go

1.8o  1.8A

These motors came off a chinese mini CNC that i bought a few months back, so getting microstepping info might be a problem. There is no reduction between the motor and screw, the motor has a 8mm shaft so i turned the leadscrew down to 8mm.

General Mach Discussion / New Leadscrew, need settings
« on: December 22, 2010, 09:05:42 AM »
Would anyone know what settings i need to enter to drive a new leadscrew.
The leadscrew i have purchased is http://www.worldofcnc.com/products.asp?recnumber=61 its the 12x3D.

Im about to test the x axis on a new machine im building.


General Mach Discussion / Re: Go Home
« on: November 08, 2010, 11:59:14 AM »
thanks hood

General Mach Discussion / Go Home
« on: November 08, 2010, 10:45:13 AM »
Small problem, while ive been setting up my new machine i have had to hit STOP a few (hundred) times.

Thats fine works fine, but then when i hit GO HOME Mach moves in the x or y direction first gets to home position then moves up z

It does go home, but i want it to move up z before it moves x or y.

is this a Gcode problem or does Mach control the Go Home function.


General Mach Discussion / Motor size vrs table
« on: November 08, 2010, 10:37:56 AM »
Recently purchased a mini CNC machine, it came with everything i needed to cut.

The size of the cutting area is 300x200.

I know this will be hard to answer without knowing the exact size and power of the stepper motors, but what size machine do you think these motors would move without any problems?

Sorry i cannot tell you what type/power of stepper motors i have connected but there is nothing on them to tell you. All i can tell you is the screw ( the threaded bar the x axis runs on ) is 250mm long and around 13-14mm wide

The reason im asking is i want to build a larger machine using as much of the machine i have at the moment to do it, keep costs down.
The CNC i purchased is great for what i wanted to do, which was machining parts out for RC planes, ( Balsa wood, light ply) but i have got the bug, i want to make some bigger stuff. 1500mm x 1500mm would do me for a bit.

Another question
The threaded bar that x y and z runs along, is this called a ballscrew?

Last question.
Does anyone know a UK supplier of this threaded bar (ballscrew?)


General Mach Discussion / Re: Scale Question
« on: November 05, 2010, 04:49:38 PM »
Just a update in case anyone else has this problem. ( Scale )

It was a setting in mach3 in motor tuning, when i bought the machine there was a manual to set it up, but obviously i did not read it all correctly. The manual says to enter the following values in:-

Steps Per: 800
Velcocity: 1500
Acceleration: 200
Step pulse: 5
Dir Pulse: 3

Without entering the following values i was getting scale problems.
Im guessing the values you enter would be diffrent to what i have entered, but if you are having scale probs have a look at motor tuning.

BTW Ron, i set IJ to INC and i have not seen them random circles since, so thankyou very much for that fix.


General Mach Discussion / Re: Scale Question
« on: November 01, 2010, 02:43:35 PM »
Thanks Ron, im 99% sure mach does show IJ mode active or something like that on the "Condition" button on the Program Run page.

Will check tomorrow, bit cold to nip out to the workshop tonight.



General Mach Discussion / Re: Scale Question
« on: November 01, 2010, 02:25:29 PM »
Seems to be sorted now, Im generating the Gcode with Cut2d and it is cutting at the correct size.

Allthough im having a little probem now and again when i load the gcode into mach, for some reason it just randomly adds circles to be cut on top of my the peice i wish to cut, no idea where these are coming from but to solve the problem i edit the peice slightly in cut2d and re-save/reload and they go away.


General Mach Discussion / Re: Scale Question
« on: October 30, 2010, 04:41:24 PM »
Hi John
I agree with you 110% on the Cut2d program, after a full week of trying diffrent programs and finding all of them to complex i downloaded cut2d trial and within 5 mins i paid them and had the full version as it looked and felt like someone as stupid as me could use it easy.

I have just found out how to generate Gcode in cut2d, will generate code and give it a try.


General Mach Discussion / Re: Mach 3 Licence
« on: October 30, 2010, 04:07:50 PM »
Hi Ron
Thanks for the reply but theres no option in the bios for lpt.


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