Messages

31

General Mach Discussion / Re: Any one know how to build a cheap linear encoder?

« on: March 10, 2008, 06:42:36 PM »

I am not fussy.  But, I know that my lead screws can shift a little and I miss steps.  So what ever I use, I would like it to be independent of the drive system.
http://www.batbuilds.com/~adam/cnc_rev5/wing/img_7156_resized.jpg

32

General Mach Discussion / Re: Any one know how to build a cheap linear encoder?

« on: March 10, 2008, 06:29:15 PM »

Looking for a max distance of 48in.  So, I would have to hack apart a big printer/plotter.

33

General Mach Discussion / Re: Any one know how to build a cheap linear encoder?

« on: March 10, 2008, 04:33:48 PM »

Looking for something around 0.2mm (0.01in), or better.   Not bad with electronics and can build up any basic circuit, and cut then needed PCB board.  How about using the sensor from an optical/laser mouse?

34

General Mach Discussion / Any one know how to build a cheap linear encoder?

« on: March 10, 2008, 02:25:05 PM »

Any one know how to build a cheap linear encoder?  Just looking for a simple cheap way to build up a linear encoder.  Ideas?

35

General Mach Discussion / Re: inconstant speeds?

« on: February 29, 2008, 10:22:32 PM »

That worked. I spent a good amount of time tuning the steppers.  Thank you.

36

General Mach Discussion / Re: inconstant speeds?

« on: February 29, 2008, 06:26:01 PM »

cool, I will give that a try.  Thanks

37

General Mach Discussion / Re: inconstant speeds?

« on: February 29, 2008, 05:24:36 PM »

When you are trying to build an airfoil and it is based off molds, the quality of the molds is VERY important.  Every defect in the mold is 10X worse in the fiberglass.  So, I care allot about those 0.01% changes.  I would just like to figure out the cause of the slowness.  The CPU is only at 10~14% usage.  Why is the CNC slowing down on the curves?  Is there different driver software that is not effected by lots of little movements?

38

General Mach Discussion / Re: inconstant speeds?

« on: February 29, 2008, 02:55:21 PM »

Inches.  Ummm, Not quite a stealth bomber.  But very close, as I am cutting out wings molds for RC airplanes.  So, no true curves, this is all constant changing curves that cant be represented by G2 and G3, I think.  So I think I am stuck with the slower speeds.  I will live.

39

General Mach Discussion / Re: inconstant speeds?

« on: February 29, 2008, 11:12:50 AM »

All of these movements are X, Y, and some Z movements, No G2, or G3.  I am using MeshCAM to gen my G-Code.  How would I convert  the following G-Code into G2, and G3 moves?   I have no problems writing some code to help with this issue.
X6.025Y1.991
X5.981Y2.005
X5.713Y2.106
X5.668Y2.125
X5.534Y2.175
X5.490Y2.195
X5.400Y2.228
X5.222Y2.307
X5.177Y2.323
X4.910Y2.440
X4.865Y2.463
X4.820Y2.482
X4.731Y2.527
X4.692Y2.544

40

General Mach Discussion / Re: inconstant speeds?

« on: February 28, 2008, 10:19:30 PM »

Messed with CV and was able to speed things up a bit 40/100.  Any other ideas?