#211
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Congrats Fox, Well Done! By-the-way you can run your spindle for a few minutes safely for a test cut, mach has the 'roadrunner' test file you can run under a minute.
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#212
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Yeah I know, ( not using mach btw, but edibg has similair files ) but my instincts tell me its not bad to have to wait untill the spindle to double check everything. Already found some loose bolts here and there, adjusted gearboxes, greased my rack and pinion etc. So you all have to be patient with me some more
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#213
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Gefeliciteerd
Congratulations with your good looking machine. Is ashame that you have to disamble the whole machine for the paint job.
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#214
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I'll survive, I planned it this way.
When you build a custom motorbike or car it's common practice. |
#215
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Congratulations Fox. Those last few details can be the toughest. Now you can enter phase 2 and figure out how to run the software. Happy cutting!
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#216
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Well Done!!
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#217
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Quote:
Yeah, it's never finished I know... Still have to built Dust and Vacuum table ( have motors already in stock ) after it's cutting those will be some of the first parts of the machine ( after a bed for my little son, that will be the first ''real' part after al test have been finished. Thnx Darren ! Last edited by Fox; Mon 15 September 2014 at 11:41.. |
#218
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Congratulations, looks strong.
The motors are hot on 71Volts? |
#219
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No... motors are 45 degrees ( on the outside, I have no means of temping the inside) after running 3d files for one hour. Plesse note air running - not cutting yet, so teh motors are not really pushed to their limit yet.
I listened to Geralds advice and exprience, because I want max performance out of my machine. There are many running lower voltages. There have been heated () debates on this mattter, search the forum. Last edited by Fox; Tue 16 September 2014 at 02:40.. |
#220
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I need advice, what would you guys advise on setting my velocity and acceleration to considering my large table and my electronic specs (see thread)
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#221
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My acceleration is set around 25 but the speed is set above 600 (can't remember exacts). I found the machine will beat itself to dead on direction changes if acceleration is much higher.
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#222
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25 inches and 600 inches.. I assume ?? then I was already jogging above that .
I am in metric = velocity in mm/s, and acceleration in mm/s^2. Last edited by Fox; Tue 16 September 2014 at 04:42.. |
#223
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Go as fast as you can go
Start with 25 / 600 ipm ( 10 / 250 mm/s, right? ). Increase your speed until the motors stall during accel or decel. Tweak your accel down / up until the stall goes away, or drop the speed by 5% and tweak again if necessary. Then, drop your speed by 15 - 20%, and test violently changing direction in x,y and diagonal and ensure no lost steps. There's your max speed. If you have lost steps, you may need to drop the accel a bit. Let us know what you end up with. Always useful to have another data point. |
#224
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Ok, I'll start playing.
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#225
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There you go. That's good advise, when initially set up I just stopped adjusting thinking it was good enough for now, I too might go ahead and increase the speed.
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#226
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Its good to write a short G-code commanding the axis to to go to-and-fro for the tuning
for Z-axis G1 z0 F(desire speed in mm/min) G1 z200 G1 Z0 G1 z200 G1 Z0 ..... |
#227
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Ah i was thinking, there must be a test program to do this. I found emc has it ( a program to find max velocity and accelaration).
Is this gcode you write (i am not familiar with programming g codes manually) something it could copy paste in notepad++ and save as, and run ? |
#228
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Fox, pity you're not using Mach, there is an add-in called the Break In Wizard, it generates gcode to exercise the machine multiple times....
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#229
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Fox, I don't write my own G-code per say, got aspire to do the hard labour. I reckon its always good to know the G-code well enough (or cheat buy having a g-code pocketbook) for occasional troubleshooting.
yes, you can use a wordpad or notepad to write one & save it with .tap extension for Mach3 & .ngc for Linuxcnc. |
#230
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Quote:
@ Ken, yeah I know, let I was more asking if: G1 z0 F500 G1 z200 G1 Z0 G1 z200 G1 Z0 G1 x0 F500 G1 x200 G1 x0 G1 x200 G1 x0 G1 y0 F500 G1 y200 G1 y0 G1 y200 G1 y0 is a valid G code file when saved, or do I need to add headers , closing brackets etc ? I am familiar with coding html, java and css not G code.. |
#231
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Yup, thats the one. Works pretty well, I used it on my previous machine.
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#232
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I think I need a good test file. My values seem way too high according to advises ?
I had my machine set at X and Y @ 500mm/s vel and 250 mm/s^2 accel. The Z is @ 195.3mm/s ( it made that number from 200 as input ?) vel and 150 mm/s^2 accel. It jogs fine at these speeds, and it 'cuts' (writes) fine as well with some dummy programs. |
#233
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Are you sure those numbers aren't in mm's/min?
250mm/sec/sec accel is about 1.5 G's, and is about 6-8 times quicker than the quickest home built machines. |
#234
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https://en.wikipedia.org/wiki/Standard_gravity says 1G is 980 cm/sec^2. So 250mm/sec^2 would be roughly .025 g, but I could be off. (Changing units always got me in physics.)
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#235
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My mistake. I was looking at his feedrate in mm/second, and multiplied the accel by 60 by mistake.
Let's try this again. I think that 500mm/sec is 30m/min, which is very fast. But an accel of 250mm/s/s is much too slow for 30m/min. |
#236
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Quote:
I don't quite get what you meant completely. its an ASCII file if I remember correctly. damn, its been so long ago when I last did this., I suggest you open a simple G-code for Mach3 & look for your answer. Also, 1)its better to split the above mentioned G-codes into 3 separate files; one for X axis, one for y-axis & one for Z-axis. Its always advisable to tune one axis at a time, will save your sanity. 2) Should add plenty reciprocating strokes, the above codes only entails 2 strokes. IMHO, 20 strokes is barely enough. 3)Also, have a lot more strokes length in each test file, since you are building a 1.2mx2.4m table, you should have the X & Y strokes a lot longer, at least 1m & 2m strokes respectively. 4) have one hand on the E-stop when you start the G-code. Its a great time for you to have an hands-on feel of what the speed & acceleration numbers entails. While you are at it, keep an eye on the raping time too (0 to full velocity) IMHO, 0.1sec should be fine, but don't cast this number on stone.... |
#237
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Thanks to all, will built me some proper test file, and slow things down before I try to built speed again..
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#238
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Update:
Got my new coolant pump Sicce Syncra 3.0. It does the job perfectly. Shame it took over a week to get here, cause the place where I ordered it f*cked up big time on their side. Then time ran out ... and I had to move my entire life (planned move to another nicer but old house) in 1 week. Meaning absolutely no MM time (12 hour days painting, fixing etc.). Got the move that done (sortof, still surrounded by my life in boxes). FFWD, to tonight. Pump mounted, tested everything, need some last (wiring) fixes and then..hopefully first cut this weekend. Last edited by Fox; Fri 03 October 2014 at 10:39.. |
#239
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Fixed my pump situ, considered waiting untill my Dust management was working for 1 second..nahhhh. Just a piece of grabage mdf ( some holes we're already in it as you can see ), and my 6 mm two flute hss endmill could not pocket the entire letters (see H) cause they we're to small, but who cares.. IT CUTS. Happy with the quality of the cut, have no idea if my feeds and speeds were any good. Surface of the mdf (the top of the pockets) needed a light sand to get rid of fibers, but the inside edges of the pockets are like this straight of the machine. Each letter is approx 25 mm high and a little over 6 mm wide. Before I do any more cutting my priority is now with cutting a working dustfoot Last edited by Fox; Sun 05 October 2014 at 14:47.. |
#240
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Well done!
Prioritize a working dust foot is very wise. |
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