Thanks for the update - it really is great to see some more of this amazing conversion/rebuild in action. Keep up the great work!
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Thanks for the update - it really is great to see some more of this amazing conversion/rebuild in action. Keep up the great work!
you are the first i see that doesnt use the 4 or 5mm ballscrew pitch.
i wanted to go for 2mm pitch myself on my x3 in the future.
do you have good results with your 2.5mm ballscrew?
We wanted to directly couple the DC servos to the ballscrew, so we thought it wise to select a small pitch screw to get enough torque and force. That also gives good resolution with the 1000 ppr (4000 edges per rev) encoder. The downside is slower rapids - the theoretical maximum with 3000rpm servos is now 7500mm per min, and in practice we get about 5000mm per min. This is more than enough for a hobby machine.
Congrats for very successfull rebuild! Clean sound without resonance. Clearly not a toy :)
[B]This is freaking awesome stuff right here! Awesome!
-Jason[/B]
Hi,
I uploaded a new video "Making a fixture for drilling operation"
at [url]http://www.youtube.com/JMI80[/url]
There's pretty fast aluminium roughing (feedrate 2000 mmm/ min) with 8 mm end mill shown. NC program was not perfect and machine allmost stops when there comes tight radius and lot's of Gcode, but since that was one off part it's not so critical.
There's more information and pictures about these parts at my friend website at [url]http://www.anderswallin.net/2008/05/finderscope-rings/[/url]
Regards,
JMI
After mounting a 500 cpr encoder on the spindle motor we now also have rigid tapping:
some M3 threads:
[url]http://www.youtube.com/watch?v=9hrduckmcd4[/url]
and some M6 threads:
[url]http://www.youtube.com/watch?v=uhaKQH2CCGI[/url]
AW
[B]Nice stuff!
-Jason[/B]
[quote=andy55;458702]After mounting a 500 cpr encoder on the spindle motor we now also have rigid tapping:
some M3 threads:
[url]http://www.youtube.com/watch?v=9hrduckmcd4[/url]
and some M6 threads:
[url]http://www.youtube.com/watch?v=uhaKQH2CCGI[/url]
AW[/quote]
Wow, this machine just gets more and more impressive! When's your tool-changer coming? ;)
So how does rigid tapping work in EMC? Do you still have a 1.5kW induction motor and VFD on the spindle? Does EMC just command a spindle stop at the bottom of the stroke, and then slow the Z-movement as the spindle spins down, and then accelerate back up out of the hole as the spindle spins back up in reverse? Is EMC really turning a dumb VFD + and encoder into an AC servo? It's very impressive however it works!
Yes we demand that you add a tool changer! Very impressive!
[quote=digits;458986]
So how does rigid tapping work in EMC? Do you still have a 1.5kW induction motor and VFD on the spindle? Does EMC just command a spindle stop at the bottom of the stroke, and then slow the Z-movement as the spindle spins down, and then accelerate back up out of the hole as the spindle spins back up in reverse? Is EMC really turning a dumb VFD + and encoder into an AC servo? It's very impressive however it works![/quote]
As far as EMC2 is concerned, the spindle runs in open-loop. I command an RPM from EMC2 which is output as a pulse-train to the VFD and the VFD will spin the induction motor at this RPM (more or less). Internally the VFD uses back-EMF, measured phase current and such things for vector control, but these signals are not wired to EMC2.
The Z-axis is then 'slaved' or 'geared' to the spindle encoder. So instead of the set-point for the Z-axis PID coming from the trajectory controller this set-point now comes from the spindle-encoder (multiplied by some scaling and some offset added). There's a detailed description of the G33.1 code I used on the wiki
[url]http://linuxcnc.org/docs/html/gcode_main.html#sec:G33,-G33.1:-Spindle-Synchronized[/url]
at least this is how I understand it right now...
I don't think the toolchanger is coming anytime soon :)
AW
I'd forgotten that induction motors were pretty much synchronous! That G33.1 is pretty sweet - the sooner I move to EMC, the better!
Hi all,
I made short IOM RC yachts tiller arm production
run at the weekend and shot video from that. Here's
also couple pics about the setup. There's now finally three vises in use on our mill.
You can find video from there:
[url]www.youtube.com/JMI80[/url] and it should also appear below.
"http://www.youtube.com/watch?v=gTJ0kC3AQus"]YouTube - Machining of IOM yachts tiller arm's
For this video, all tools except 8 mm rougher are
run without coolant, so you can see much better what is happening. Didn't want to try what happens if I run that rougher without coolant since I programmed pretty aggressive feedrate for that..
NC spot drill makes couple stupid moves but I didn't bother to fix those anymore at late in the evening...
[B]Awesome stuff. Look exactly like servo horns :) I'm into Helis and planes myself. Great stuff!
-Jason[/B]
Thanks for posting that - I love watching this machine run :)
Hey, I just wanna say I enjoy all of you who share your videos of builds and or upgrades to your machines! Man, they are awesome! it's the epitome of what homeshop machining means. I just can't figure out why hobby machining has never made it to TV...lol, then again I can probably host a cable access show....lol...with clips from youtube...lol, yeah, it could work, it could work, it could work...(If Dorothy can find herself home after repeating it three times, maybe we can get machining on TV...lol) Thanks guys for your videos on your projects, builds and test runs... keep the videos coming and the good work up...
-eddie, satisfied viewer.
Very impressive. I am still stuck in the 1 op mode. I have so much to learn about this.
How did you set up the Offsets for different vices? Were they creted as different gcode ops and then tied together using the offsets?
I just really don't know how that is done. :confused:
[quote=cjdavis618;463639]Very impressive. I am still stuck in the 1 op mode. I have so much to learn about this.
How did you set up the Offsets for different vices? Were they creted as different gcode ops and then tied together using the offsets?
I just really don't know how that is done. :confused:[/quote]
Hi,
Sorry about late answer, it's been a while since I visited in CNC
Zone and for some reason I did not get any email from cnczone
that there has come reply to this post. But let's go to your
question:
Using offsets for different vises is pretty simple. Maybe simple
example program is best to explain their use. Let's assume
that you have three vises, there's one part in each vice and you
want to do NC spot drill operation for all parts. Let's also
assume that part zero is at part's left upper corner, and NC spot
drill hole place will be X10.0 Y-10.0 from part zero
%
O1234
G90 G80 G40 G49
G91 G28 Z0.0
G91 G28 X0.0 Y0.0
G90 G10 L2 P1 X50.0 Y-100.0 Z-300.0
G90 G10 L2 P2 X200.0 Y-100.0 Z-300.0
G90 G10 L2 P3 X350.0 Y-100.0 Z-300.0
T1 M6 (NC SPOT DRILL)
G54
G0 X10.0 Y-10.0
S6000 M3
G43 H1 Z5.0 M8
G81 G98 X10.0 Y-10.0 Z-2.0 F600.0 R5.0
G55 X10.0 Y-10.0
G56 X10.0 Y-10.0
G80
G0 Z50.0
M5
M9
G91 G28 X0.0 Y0.0 Z0.0
G90 G80 G40 G49
M30
%
That should do the NC spot drilling job( if I can still do manual
programming...). At the beginning of the
program there are G90 G10 L2 P1 XYZ lines. In those you put
the distances from machine zero(reference point) to part's zero
points. P1 is for G54, P2 is for G55 etc.
I learned to use G90 G10 L2 P1 XYZ at work with Fanuc
controls. It also works with EMC2. I don't know what control
you are using, but maybe G10 will also work with Mach3 or
similar.There should be something about G10 in manual if it can
be used.
Those IOM yachts tiller arm parts were programmed with CAM.
I made separate programs for each vice and I combine those into
one manually. That kind of programming is used regularly in
commercial series production machine shops. It's also good
programming exercise for home shop machinist!
Thanks, that helped out a lot. :)
I do use Mach3, so I will try and use that when I can.
It has been more than a year since the last update. Thought I would post a note with some recent activity. No major machine upgrades recently...
Milling steel:
"http://www.youtube.com/watch?v=aCVVW34wNM8"]YouTube- IOM Keelbox Mould
some plexiglass work, actually just testing HD video on Canon 500D :)
"http://www.youtube.com/watch?v=G7xq1h5KwuE"]YouTube- EMC2 controlled CNC-machine (Canon 500D video test)
roughing MDF
"http://www.youtube.com/watch?v=kIjsmuomzFI"]YouTube- IMGP0288
Finish cut in MDF:
"http://www.youtube.com/watch?v=LcXSreqAyZY"]YouTube- IMGP0289
some rings for holding a finder-scope on my telescope:
[url]http://www.anderswallin.net/2008/05/finderscope-rings/[/url]
and DIY anodizing them:
[url]http://www.anderswallin.net/2009/10/anodizing-aluminium/[/url]
steel part for a microscope:
[url]http://www.anderswallin.net/2008/09/nikon-te-2000-objective-holder-in-steel/[/url]
3D milling of moulds. These will be used to mould carbon-fiber keels and rudders for RC model yachts
[url]http://www.anderswallin.net/2008/06/iom-fin-and-rudder-moulds/[/url]
that's it for now,
AW