0.1mm off?

[orb505]

I'm not suggesting this is a bug and it's probably a RL thing (I'm not a machinist) but I've got a piece of brass (I think) thats 85mm, I zero the tool to the piece. Move the tool down 5mm, machine off the 5mm. Piece is 79.99mm ?!?!?

Is there something I'm missing? the maths add's up so probably a factor I'm not taking into account.

[VIDIAn]

Hi orb505. To be very precise, you need to move tool very slowly at the end. So slower that you zero the tool and slower that you cut before the end, more precise the measure will be. I think this was the problem in your case.

[orb505]

OK, good tip. Thanks

[orb505]

Originally posted by VIDIAn:

Hi orb505. To be very precise, you need to move tool very slowly at the end. So slower that you zero the tool and slower that you cut before the end, more precise the measure will be. I think this was the problem in your case.

I've been testing this out and still cannot get the tool to cut the precise amount off the work piece in a single pass. I've been moving the tool with Edge Detect mode very slowly as suggested, the slowest speed possible of 0.001mm in some tests (see screenshot) but without success.

I explained the issue on my recent live stream. If you go to about the 15 minute mark on the VOD you can see the problem and explain where I'm going wrong?

https://www.twitch.tv/videos/1568293463

In the VOD you can see that for a 82.5mm piece I first cut off 2.5mm which should make the result 80mm exactly, but it's 79.97mm

I then undo the cut and have to take 2.47mm off to make the correct cut

https://steamcommunity.com/sharedfiles/filedetails/?id=2851986684

[Jonathan Joestar]

Hello there! Not the dev, but I am a machinist that has been considering picking this up. This might very well not be the answer in game, but after viewing the segment from the VOD, here's the advice I'd give from a real world position:
First, when the tool is touched off, rather than raising the spindle, engage the spindle and feed off the near edge.
Second, if there is a spindle lock option in game, ensure it is engaged.
Third, when adjusting the depth of cut, rather than lowering the spindle, raise the table the required distance. Slow feed as suggested by the dev is good practice for this IRL as well.
Finally, if there is a form of table height lock, engage it.

Now, if this works out, then the simulation is honestly quite good and accounts for a great deal more than I had considered. It seems rather like there might be some issue that the dev is struggling to replicate. But now you at least have some real world insight that might help resolve the problem. Good luck!

ETA: Now that I'm thinking about it, even if this doesn't work, the simulation is doing a rather good job. Most machines have their individual quirks, gotta learn those as well! XD But a final bit of musing as I'm not certain the extents of the simulation, it could very well be tool deflection down into the part as well, though I'd doubt it on a hefty shell mill like shown in the VOD.

[Jonathan Joestar]

Hey Orb, I've now picked up the game and can give you a better idea what your issue is. What you need to do is put the feed BEFORE YOU TOUCH THE TOP EDGE down to roughly .002 and edge find the top with that. I ended up roughly a thou off like that, so as long as you have skim cut material, that's pretty dead on.

[katt_nanoha]

even if all solution can't help to answer your question (I know that IRL slower feed is more accurate but inefficient so balance), know that in RL, nothing is perfectly machined to dimension, it's called 'tolerance', usually the more expensive and state-of-the-art your machine is, the more precise the cut. I guess if anyone is playing this game to have a 'feel' for future real career in this industry, this is the thing one should know.

[orb505]

Originally posted by katt_nanoha:

even if all solution can't help to answer your question (I know that IRL slower feed is more accurate but inefficient so balance), know that in RL, nothing is perfectly machined to dimension, it's called 'tolerance', usually the more expensive and state-of-the-art your machine is, the more precise the cut. I guess if anyone is playing this game to have a 'feel' for future real career in this industry, this is the thing one should know.

I'll accept that if the same allowance of tolerance is also in the career mode. I shouldn't be expected to accept that it's in tolerances if I'm not also scored with the same tolerances in mind

[VIDIAn]

Originally posted by orb505:

Originally posted by katt_nanoha:

even if all solution can't help to answer your question (I know that IRL slower feed is more accurate but inefficient so balance), know that in RL, nothing is perfectly machined to dimension, it's called 'tolerance', usually the more expensive and state-of-the-art your machine is, the more precise the cut. I guess if anyone is playing this game to have a 'feel' for future real career in this industry, this is the thing one should know.

I'll accept that if the same allowance of tolerance is also in the career mode. I shouldn't be expected to accept that it's in tolerances if I'm not also scored with the same tolerances in mind

This is a good point. We will think about how to take this tolerance into account when calculating similarity of workpiece. Thank you!