alden

Interesting. It looks like TinyG should fail the homing operation if the max travel is reached. Better than accepting it an having the coordinates be off by some indeterminate amount.

Hey, no problem. To answer your earlier question, the switches are independent by axis. Only the switches in the tested axis are read – the others are ignored until it’s their turn.

The behavior for homing an axis is that if either the limit or homing switch is active during the startup for that axis an additional move is made to back off that switch before performing the search to the homing switch. You figured this out, but I thought it was worth restating it.

Interesting thought but probably not a good idea. Each stepper driver regulates current in it’s own clock, so the power transfer would not be uniform. By using an 8 wire, though I assume you will electrically isolate the phases, so it might actually work.

I’ll make you a deal – if you try it and blow up the board (which should not happen – but you never know) we’ll replace it if you provide a full report of how it did or did not work. Be aware that we are out of stock for about the next 2 weeks, so I’d hold off on the experiment for just a little.

If you attempt this let’s sketch it out and discuss things before you try anything. I’m pretty sure doing this w/o driver isolation will have bad results.

One other note about arcs – you can somewhat control how many lines are drawn by setting the chordal tolerance value. It’s set very low by default (0.001 mm), which effectively is the finest possible resolution. This can be made coarser and generate fewer lines. It doesn’t change the arc behaviors described above, but I thought I’d mention it.

@psyko – What build are you running? We did a lot of work on arcs after build 380.xx. These changes are being staged through edge right now. If that error still exists I’d like to find and fix it. If you have any files that you know perform this can you please make them available (dropbox or some other link, presumably) — Thanks

Hmmm. I see the transmit dialog for as long as Coolterm is reading the file form the disk, then it disappears, but that’s usually well before the motion stops. I think Coolterm is filling it’s buffers, then once they are filled that dialog goes away. Thanks for the clarification.

Hey, If you have that cambam gear file that cut the bad arc I’d really like to see that one. If TinyG is messing up and cutting an arc in that gear we need to fix that. I have not seen that kind of behavior in a very long time, but if something’s lurking there we need to nail it. If we don;t see it, then it points to something else that we should be tracking down. The fact that it’s repeatable in your setup gives me hope that we can reproduce it and find the source of the problem.

It is possible to increase the planner queue size but I’d rather leave it where it is for memory reasons. However you are welcome to set to whatever size you need. But 100+ mS should be enough for a UI to react, I’d think (and that’s worse case).

If you want to change the values look in planner.h, here:
/* PLANNER_BUFFER_POOL_SIZE
* Should be at least the number of buffers requires to support optimal
* planning in the case of very short lines or arc segments.
* Suggest 12 min. Limit is 255
*/
#define PLANNER_BUFFER_POOL_SIZE 28
#define PLANNER_BUFFER_HEADROOM 4 // buffers to reserve in planner before processing new input line

Oh, and even though the limit is 255 (due to indexing, the practical limit is when you run out of RAM and that’s way less than that (I don’t know the exact number but each queue slot takes about 200 bytes)

• This reply was modified 10 years, 9 months ago by alden.

Let me get through the diagnosis and see what we can (and cannot) do with Coolterm. Separately we are qualifying the Edge branch and making sure it works well and works with tgfx. I don’t have an estimate for when this will be finished, but this is what we are working on so it should not be long. Beyond that we’ll make sure you can get your firmware upgraded when the time comes.