Preben is now known as pmbdk
pmbdk123 is now known as pmbdk
pmbdk123 is now known as pmbdk
hm, what problem would arise if stepconf didn't ask for direction setup & hold, and just made them very big numbers (like 200us) instead?
someone would notice on a direction change there is a 'large delay' ;)
the axis is always stopped at direction changes anyway - it probably doesn't make any difference
I remember playing with the numbers and wonering why the max frequency wasn't changing.. then I had a duh moment.
EMC: 03jepler 07TRUNK * 10emc2/src/emc/usr_intf/stepconf/stepconf.glade: increase the range of step timing values accepted
EMC: 03jepler 07v2_2_branch * 10emc2/src/emc/usr_intf/stepconf/stepconf.glade: from TRUNK: increase the range of step timing values accepted
other axes aren't necessarily stopped though
so you can screw up something like an arc
hm -- check my math. on a 10" circle cut at 1inch/second, not moving for 200us after a reversal would represent a deflection of sin(2*pi*200e-6/10) = .00013 inches
err - I can't check math at the moment. lack of caffeine, you see :)
actually, with that driver it wouldn't be an issue at all - the 5KHz max step rate means that there could only be one microstep "extra" in that time
at most one
steves_logging is now known as steve_stallings
By removing the setup time you risk confusing the more knowledgeable users who would want to confirm that they were not violating that sped.
Hi SWP, how was the trip, did the eee work out?
trip was great - I didn't end up bringing the eee
oh right - we needed space for photos or something, which made it not quite functional
I did the updates on the Ubuntu disk, but of course couldn't find a way of making it boot from that automatically
and I didn't have the time to figure out how to get the eee OS into "advanced mode"
thanks though, it was interesting to make the attempt ;)
not a problem, just having wifi on the r
ubuntu is a gteat improvement
if I had more time, I probably would have made it work
dang, put the food down, use two hands, then I might be able to type
hmmm - there's an idea
gee, its been about a week, I should run hide....
on the other hand, you seem busy with the Hardinge
nope, went to see the folks and made a long weekend of it
yeah the mill is currently pretty useful - the lathe, not so much
SWPadnos: I don't use advanced mode on my eee, just the ctrl-alt-t terminal shortcut and the ctrl-alt-n firefox shortcut
I probably could have gotten by with it (almost assuredly, since the hotels charged 27 euro/day for internet access)
which means I didn't use it much
have you figured out if the GE 550 is actually runnable?
it might have a problem with the tape reader, but everything seems to work at MDI
so I bet I could get it going pretty easily.
I figure that fixing old servo drives may be worth the trouble, but if the 550 is broken that is a much harder road to travel
steve_stallings: I do hope to keep the velocity mode drives
there's a problem with Z oscillating that I haven't quite nailed
I might get to work on it more tonight.
sigh. I wish my bridgeport weren't turning into a heap of rust
saw that, my first guess would lost motion in the feedback loop, second guess would be dried up cap in a low pass filter in the tach feedback path
the weather has been the absolute worst for rust - rain every day, followed by heat (80s-90s)
then cool nights, so it can get the maximum condensation when it gets humid the next day
assuming the osc is in the greater than 20 Hz region, if slower then it might be mis-adjustment
the osc was about 65Hz. I fixed the loose motor pulley and now it's much faster.
Cradek - do you know the control bandwidth, Jon Elson said the old AB he had was only 25 Hz
(I think it's mechanical.)
no, I don't know that
does the osc continue if the command input to the amp is removed?
it did, but I have not tested that with the pulley fixed yet.
i.e. does the osc feedback path include the control, or just the tach and amp
so now, so far, I don't know which loop is oscillationg
right, that's the first thing I will find out when I get going again
I broke a coupling and had to order replacements.
hope to get them today
what, no rubber hose and clamps?
it was very tempting
I looked around and didn't find hose the right size :-)
hey Steve - could you email me your shipping address so I can get the eee back to you before the next CNC workshop :)
okie dokie - thanks again
I'll probably UPS it
wow - NewEgg's "shell Shocker" is a pretty good deal - 8GB USB memory stick for $18.99 including shipping
wow - I just got some from buy.com for 23 iirc free shipping - that is better yet
sandisk is likely better than Transcend or TotalMegaStuff or whatever it was :)
ah -Super Talnet
they're nmot bad, but not exactly top notch either
I had to remove teh u3 from it.
yeah, me too
on a couple of others
the interesting thing is that the U3 removal utility has a nice little bug
when it's backing up the data from the other partition, if you hit "cancel", then it cance;s the backup, but doesn't cancel the formatting of the drive
* jepler wonders what the performance is like if you attach 4 of them to a USB hub and RAID-0 them -- it might give increased read performance if this old benchmark is accurate http://arstechnica.com/reviews/hardware/flash.ars/8
of course, I don't wonder enough to spend over a hundred bucks on it :-P
the drives are listed as 120X (18MB/sec), so you could certainly fit a few of those into the 60MB/sec of USB2
4 is probably the right number for making it USB limited rather than drive limited
I just picked 4 since that's a typical number of ports on a USB hub
I think it also happens to be the "right" number :)
hmm - I don't know if I can fit all this on the board.
My other thought is that I would have the driver board - and the logic board that would plug one on top the other.
the driver board would have the fets and driver ic (plus the current sense resister) and the rest would be on the other board
steve_stallings is now known as steves_logging
eagle is pretty cool...