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It is normal and expected, you know who does it and you just deal with it and do some gentle talking.

I think the price so way stupid even if baby new but it you want it,.......
Sure a nice SG but....15K???

First aid needs for obvious reasons open to all.
A very big company did a real look at a free vending machine for aspirin, bandaids, etc on the floor.
It ran into several roadblocks but the project...

The math inside the control tracking the rad is the same. Technically on different borders one or the other is more accurate as it is all integer encoder counts happening.
I like Rs for ease of use...

Even with LVDTS there is static and dynamic motion and how servo loop work.
End position is not running at 1500 IPM.
This a rabbit hole with no end. Control loop people love this math. Arc is...

angelw,
The above is just mean. All miss things but no need to make it hard or a shaming episode.
You don't have a better half so maybe hard to understand that thing called diplomacy and treading...

Backlash comp done with a indicator and simple step moves back and forth is almost always wrong and way overdone.
Bob

How many "near misses" are there across the USA in manufacturing in one day?
How many non-reportables or just never logged.
Slice a finger pulling out a chip and dripping a blood train to the sink...

Safety glasses, who needs stinking safety eye-wear..
Bob

CNC interpolated holes will never be "round" like a boring bar but who has a $50,000 gauge to check this?
For so many fits they are close enough and so easy to adjust to make any size even if only...

Tough task without schematics.
Could very well be a bad cap or a simple solder joint gone to poop.
First thing I do is clean board and pull and reseat any socketed chips. Clean any buss contacts....

Big clue here that I think many are ignoring.
Sort of eliminates screws, motors, encoders, tachs or tuning.
This seems inside the control's brain and guts.

Did you come here just to argue and show how you know more than people with 50 years plus experience?
Seems like you don't want to hear any answers that do not fit in your thinking box or point of...

Rather amazing how the east is east, west is west and never the twain shall meet has grown so much wider in the last 10-20 years.

One thing that puzzles me on the "steal". Did only one side cheat...

^^^^^ This.
Never trust a gage block to be square even the best of them.
Kiss tenths goodbye if side clamp or line up.
Have learned this lesson the hard way.
Bob

Would have been interesting to see the shallow stepover done with lower spindle speed or higher feedrate to maintain effective chip load the same as the other tests.
Bob

Flow rate with only gravity the acting force is sensitive to hose type, length, fittings.
A one inch drain hose on one of my SG coolant trays will not keep up with my 10GPM coolant flow and the 6...

With the motors, tachs and encoders eliminated by your tests I would first suspect a bad counting/interpolating chip or circuit on the drive board where the linear encoder interfaces.
If the motors...

Fail or not I do so much LOVE dearly this one statement of stand and do.
Bob

Ah, you are chasing feedback resolution which makes sense out front.
Now is the rest of the system, up to the task?
There is a world here of mechanical errors and loop time consonants that you are...

The cutting forces in micro machining are so small.
The accuracy requirements are high. Way, way past closed loop steppers on a contour.
I know it seems so straightforward and just high resolution...

I wonder if we had been born with 8 fingers and Octal math would 10x10 be so easy and intuitive?
Bob

The facts are weird. For sure very few people work for base min wage.
Next question how many work for less than $15?...... 1/2 the workforce?
Very different answers to the same question.
Bob

Florescent tubes do not do this? Not sure how you used to adjust the speed on your old vinyl record turntable.

Details....
Cost per student, what do they have to bring in hand to the class.
Their own scrapers already built or a Biax. A project of sorts?
The OP has only 2 posts.
Bob