Search results

Does that version make up the missing steps, due to dropping the digits after the decmil? Where could I find a copy of his sketch?

The sketch in post #54 works perfect for cutting gears if you use the "B" option (number of Divisions). It repeats back to the starting point on every number of Divisions I tested it on. The backlash isn't consistent on any of my off shore dividing heads, so I never backup when using this setup.

This looks really nice, are you using the sketch that Timo modified to pick up the missing steps to make sure you end up where you started on a 360 degree circle? I plan on using my setup to cut the last 4 gears I need for my current project. Thanks for sharing!

Update: The sketch that Timo posted here #54 completely solved the missing steps problem. The rotation always comes back to "zero" regardless of the number of divisions. Problem solved! Timo is working out a few bugs and making improvements to the angular portion of the sketch. Once the...

Thanks for explaining this. 🙂

https://forum.arduino.cc/t/stepper-motor-division-of-one-rotation-mostly-math/1065635?page=2 There were 32 posts in this thread, my link starts at post 21, you can scroll up to the beginning. I found this posted on the Arduino Forum.

For angle inputs are we limited to 2 place decibels or could we have 3 or 4 place? I noticed that the accumulated moves on the display show 4 place decibels???

I setup my test station again & tried this sketch. I set the parameters to match my 800 steps on the driver & 40 to one ratio on my gearhead. It comes up about 3 degrees short of making a full 360 degree rotation on a 21 tooth gear division. 32,000/21=1523.8095. (missing 17 steps) because it...

Yes, you can enter angles with 2 digits after the decimal. If you ask for 45 degrees you get it, if you want 44.4444 it gives 44.44 The equal divisions of 360 degrees are more important for my application.

That's exactly what Timo accomplished on Monday with his revised sketch, find it earlier in this thread.

Timo, Thanks for explaining this so every one can understand whats going on here. I just looked at the spreadsheet I worked on Sunday: A 42 tooth gear would have been off 40 holes in the 200 hole dividing plate you just described above. 16,0000/42=380.952380 steps needed, using only 380 steps 42...

I know there have been several years of discussion about building a digital dividing head using a Arduino on HMEM. I think I read every post at least twice over the last few days. I started out with a Arduino Sketch that was written in 2015, it had a few bugs in it. Chuck Fellows (passed away...

Thanks for looking at this. It is working good now. Timo made some changes to the sketch & now the missing steps have been added into the code.

I reset the driver to 800 steps & updated the sketch accordingly. It still works great & runs at a more reasonable speed now. Thanks again!

Another thing that I discovered is that I need to do reset before each test & zero out my indicator at the starting point

I am totally amazed! It works really good now. I tested it on many different divisions (odd ones & even) and my dial indicator comes up on "Zero" after a full 360 degree rotation. I noticed that the steps counter always reads + 1 from what the controller is actually moving?? 20 Division =...

https://photos.app.goo.gl/Pow7kkDphG3jxf5r8

If the program isn't rounding I would think the first steps would = 761 and then add in the missing 19 steps equally divided into 360 degrees. But it starts at 762 steps according to my display.

I just checked to see if the common ones still work, like 20 divisions it also overshoots this now, it moves 801 steps instead of the required 800 steps??

It must round up to 762 & then 1 pluses 19 times. It needs to start at 761 & add one pluse 19 times (762) You are really on to the solution I think!