Lathe Macros

mariusl wrote:

Very difficult to say as it changes all the time. I have a very aggressive lowpass filter on the feedback.

What I just noticed is that the feedrate remains the same no matter what spindle speed I select. Surely that does not seem right?

You shouldn't have any filtering between encoder position and motion.spindle-revs.

Also you need to make sure that motion.spindle-revs is spindle _position_ not spindle _speed_.

mariusl wrote:

Will this feature be included in production (2.6.x) at any stage or will I have to make sure that I apply a fix after any update?

Unfortunately when I suggested adding this feature to the release version there was some disagreement with how I had implemented it.
There was a feeling that the code should be aware of the machine units, and should only convert once, etc etc.
That makes is a lot more difficult and complicated, so I gave up trying to sell the idea.

At the moment, for example, you can type "1in" and get "25.4" and then type "in" again in the same box and get "645.16"

From my point of view the extra characters are just short-cuts "in" for "convert from inches to mm" and "mm" for "convert from mm to inches" but others didn't see it that way :-/

I don't know if you have spotted it, but you can also type "3 25/64in" and get "86.122" though you do have to move the insertion point to the end before typing the "in" as the conversion after "/64" leaves it in the middle of the number in a way I haven't managed to fix yet.

With the spindle motor turned off, rotate the chuck by hand through one full turn and see what the motion.spindle-revs pin does.

I have a feeling that this problem comes down to the spindle gearing. Is the encoder on the motor and not the spindle?

mariusl wrote:

motion.spindle-revs changed by 50 on one revolution

Ah, well, there's the problem

You need to change the encoder position scale so that the number changes by 1.000 for one revolution.

andypugh wrote:

You need to change the encoder position scale so that the number changes by 1.000 for one revolution.

Just to be clear, and not knowing what decimal separator you use in SA. I was trying to say "exactly one" not "one thousand"