Stepper Motor - Page 2 - Electronic Circuits Projects Diagrams Free

Bondfire · 6th March 2005, 10:17 PM

Hi watzmann.

In our case we're developing our own software for the CNC milling machine and we came up with something that is able to draw curves.

We realized curves in terms of x and y movements with rate of change.

We're modelling a curve as being made up of many many small straight lines. Prompt the user for start,end coordinates of curves and its radius.Divide the curve into many many small straight lines.For each line find gradient.The gradient will determine the movement of the x and y motors.In general,the gradient is the speed of the y motor relative to the
x motor.Put all of this in an array and execute...we're still in testing phase
but its good enough for us...wanted to compare the quality of the curves with some other method so that why i asked you...is that CNC software you're using freeware.?..Can i find it on the net?

Thanks
Bondfire

watzmann · 10th March 2005, 05:49 PM

ya i think you need to try differant software to get the suitable resoulation for your machine . ,

i think it will be difficult to find a totally free software , it's just shareware for 1 month .

you have to search underthis category .
good luck

what are you going to use in your machine ..... Drive belts or Screws??

Bondfire · 14th March 2005, 02:45 AM

Hi,

we used gears and belts previously but they kept coming off...now we're using screw threads

williB · 14th March 2005, 11:19 PM

hi bondfire,
if you are using lead screws to drive your machine , be aware that the regular type have a certain amount of slop in them which grows with use..
slop is when you are turning it one way and change the direction , they make ball bearing ones that take the slop out automatically, but of course are much more expensive..

jbeng · 6th April 2005, 11:48 PM

Quote:

Originally Posted by williB

... if you are using lead screws to drive your machine , be aware that the regular type have a certain amount of slop in them which grows with use. Slop is when you are turning it one way and change the direction ...

A phenomenon commonly known as "backlash"

Quote:

Originally Posted by williB

... they make ball bearing ones that take the slop out automatically, but of course are much more expensive..

Devices commonly known as "ballscrews"
JB

bryan1 · 9th April 2005, 08:49 AM

The cheapest way to make your own backlash free nut is to modify the nut. You cut the nut in half so to speak and install a spring in between then you have to contain the 2 nuts. Generally I make my nuts from scratch and counterbore each side in the lathe then I install 3 pins around the nut just outside the spring diameter and peen the ends of the nut. I've found this method pretty good at elminating backlash but nuthing beats a good quality ball screw.

Just a Thought

Cheers Bryan1

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6th March 2005, 10:17 PM	(permalink)
Bondfire	Hi watzmann. In our case we're developing our own software for the CNC milling machine and we came up with something that is able to draw curves. We realized curves in terms of x and y movements with rate of change. We're modelling a curve as being made up of many many small straight lines. Prompt the user for start,end coordinates of curves and its radius.Divide the curve into many many small straight lines.For each line find gradient.The gradient will determine the movement of the x and y motors.In general,the gradient is the speed of the y motor relative to the x motor.Put all of this in an array and execute...we're still in testing phase but its good enough for us...wanted to compare the quality of the curves with some other method so that why i asked you...is that CNC software you're using freeware.?..Can i find it on the net? Thanks Bondfire __________________ Live and Let Die

10th March 2005, 05:49 PM	(permalink)
watzmann	ya i think you need to try differant software to get the suitable resoulation for your machine . , i think it will be difficult to find a totally free software , it's just shareware for 1 month . you have to search underthis category . good luck what are you going to use in your machine ..... Drive belts or Screws??

14th March 2005, 02:45 AM	(permalink)
Bondfire	Hi, we used gears and belts previously but they kept coming off...now we're using screw threads __________________ Live and Let Die

14th March 2005, 11:19 PM	(permalink)
williB	hi bondfire, if you are using lead screws to drive your machine , be aware that the regular type have a certain amount of slop in them which grows with use.. slop is when you are turning it one way and change the direction , they make ball bearing ones that take the slop out automatically, but of course are much more expensive..

9th April 2005, 08:49 AM	(permalink)
bryan1	The cheapest way to make your own backlash free nut is to modify the nut. You cut the nut in half so to speak and install a spring in between then you have to contain the 2 nuts. Generally I make my nuts from scratch and counterbore each side in the lathe then I install 3 pins around the nut just outside the spring diameter and peen the ends of the nut. I've found this method pretty good at elminating backlash but nuthing beats a good quality ball screw. Just a Thought Cheers Bryan1 __________________ " The only way to avoid human error is to avoid the use of humans"