After some more tweaks, I could produce a piece I am satisfied with.
So far, my CNC can produce great results with little pieces of wood
https://nelsontrujillo.com/blog/2015/04/24/diy-cnc-first-formal-run/
Keep in mind, the piece is about 1" by 3/4"
https://nelsontrujillo.com/blog/2015/04/24/diy-cnc-first-formal-run
Looks Great!
Nice,
Which software do you use to convert your 3D file to G-code.
@Denis_Seguin
Witch software? Of what sorcery do you speak?
@Paul_Frederick : sorry wrong word :)
I make correction
English is not my first language
Nice work and great detal
@Denis_Seguin , the CNC design was done in SolidWorks, planing to use SolidCam (I’m really sold on this one), but it’s too pricy for me right now and it needs a port-processor for tinyg; then I found an old copy of Aspire roaming around, and that is the one I used for this project; but I will work on Fusion 360 instead; now that is free
Awesome
Wow, great looking results! Looks like threaded rod for leadscrews? What speeds are you able to run at? I guess at that size speed was less of an issue.
@Daniel_Would
They say they’re running ACME leads on their web page. My guess is it is 1/2" X 10 TPI from the looks of it. RPM to IPM conversions are easy with that. IPM is one tenth of your RPM. Running that myself I can say that over 100 IPM is doable, but a bit under is more realistic. My machine has no problems with 72-80 IPM rapids.
@Nelson_Trujillo I made my own ACME tap too after I saw what they cost. I had some troubles cutting loose enough threads in plastic with mine though, because of how elastic plastic is. So I peened the teeth in my tap to expand them a little. I smacked them with a center punch, and a hammer, to blow them out a little. That made a huge difference here for me.
Before I did that I was running the tap back, and forth through the work, and it wasn’t really helping any. Here’s a picture of what I mean.
No @Daniel_Would , they are ACME screws (1/2", 1x10) from McMasterCarr (http://www.mcmaster.com/#99030a005/=wwmto8). The GCode specifies a feed rate of 200ipm; but since I’ve been testing for functionality; I haven’t tested for limits yet.
(update) Daniel, as @Paul_Frederick pointed out later, this feed rate is way off (by a lot); the value I was running the job at, was 16ipm
@Paul_Frederick , keep in mind the threads in the nut must be as tight as possible against the screw profile; if you expand the cutting area in the tap profile, you are cutting more material than needed; you feel it slides better it is because it is loose; remember a tap has the same cutting principles as a router bit; for the tap to cut faster, besides having the correct cutting angle, it must have a relief angle; as you say, because of material flexing. An image, so you know what I mean:
@Nelson_Trujillo
to run 200 IPM with 1/2 X 10 TPI threaded rod you would need to drive the lead 2,000 RPM. That is approaching the top theoretical limit of that lead. Supported both ends, and preloaded too.
@Paul_Frederick you are right; as I said, the GCode specifies that.
I just went to take a look at the set up in tinyg, and it has a maximum travel speed of 400mm/min, that will be like 16ipm (mixed up my units so i thought 200 was somehow slow); same with the max feed rate; I was able to increase the travel speed to 45ipm; 50ipm stalled the stepper at actual current & voltage (14V); i will increase it when I get the PS (24V).
Thank you Paul for pointing that out… so much to learn.
@Nelson_Trujillo
You can do way better than 16 IPM. But yeah, your voltage will hold you back from high speed. You’d be surprised the jump I got going from 24 to 28V. I know I was. Do you run imported TB6560 stepper drives?
@Paul_Frederick I use TinyG (https://github.com/synthetos/TinyG/wiki?title=Main_Page) internal drivers; I won’t think I will need anything else for a long time, even after upgrading to Nema 23
@Nelson_Trujillo
Yeah you can run a lot higher voltage for better high speed performance. 10 more volts will be a big jump for you. If you like what you have now you’ll love what that extra bump gets you.
@Nelson_Trujillo thank for information