Optimum acceleration?

[TheGuru]

After all the discussion in the other thread about feed rate and acceleration, I’m wondering what the best acceleration is? The default is ~500 and I read another thread that 530 is good. Should the acceleration be closer to 1200?

-Tom

Continuing the discussion from DeWalt DWP611 Spindle:

@AlanDavis

If you mean speed dial on it, it’s not making any difference. Slowest speed is lot faster than stock DC spindle anyway. I adjust it 3 for reasonable noise level. I think best way to use it between 2 to 4, depends on bit size. I only used speed 2 for waste board surface cleaning with 3/4" flat.

Continuing the discussion from Maximum Inches per minute?:

@picengravertoo

If anyone wants to test the feedrate with the grbl there using, grbl settings and performance of there gcode sender, here is the feedrate test file we used. There is no M03 or Z axis moves in this file. Only X&Y and it’s in inches. It’s set at 175 IPM and should time out at 1:57 min (117 sec).

Feedrate Test File

[picengravertoo]

It really depends on what your project is. Short incremental raster gcode files requires higher accels and a different $11= (junction deviation, mm) setting to maintain programmed feedrates like when spindle engraving Lithophanes or Laser engraving photos.

[CristianHinz]

I find that anything over 500mm/s^2 is just too jerky and introduces some “backlash” with the weight of the dwp611

[TheGuru]

I’ve set x and y to 510 and z to 400. I have not cut anything yet, but I will in the next few days. I will report back.

-Tom