Xylotex board help

[SpeedsCustom]

I could have gone too the Xylotex boards but figured most guys here are running or have a Xylotex board on a Taig or similar machine. I have the 3-axis system with a 24 volt power supply, C11 BreakBoard board and running three Keling KL23H276-30-8B motors.

So i'm trying too set-up everything and get it tweaked in EMC.

Pretty much, my goal is too obtain 30 IPM. So in EMC I set the velocity too .5 which would be 30 IPM.

I have the potentiometers on the Xylotex board too around 2.80 volts, which means that it would put out around 2.1 amps which is the amp rating for my steppers.

I also have a stock setting on all axis of 1/8th microstepping, using a 1:1 ratio pulley set-up; 20 TPI thread on all axis.


When I jog in EMC, the view shows it going the speed, but I know for a fact that it's not true and up too speed. I know i'm not hitting 5 or 7 or 30 IPM. I'm going very slow and can't figure out why.


My power supply is on full too and everything is good. Can anyone help me please?


-Jason

[SpeedsCustom]

So I can't figure out how too get the speed too be true. Is it something with my microstepping? Should it be more then 1/8th? I'm not sure whats going on.


-Jason

[High Seas]

Not an EMC-guy myself , but what about your drive screws? Pitch (Threads per inch), number of starts, diameter? All "force" the ipm and resolution of your system. Are they set right -- and can they give you 30 ipm? Fewer steps should be faster -- at the penalty of resolution.
Sorry - can't shed more info for you.
Jim

[SpeedsCustom]

I have 20 TPI @ .5 in diameter I think....


I don't know if this is normal or not, but when my boards are at 1/8th micro stepping. But in EMC when I put .125 for the microstepping, the system is so so so so slow. When I put a higher number like 5.0 I start getting much faster!

So yea, I don't know if I'm on the right track. But I'm pretty convinced I can reach 30 IPM.


-Jason

[ger21]

Perhaps you need to put 8 in for 1/8 step, as in 8 microsteps per step. Sorry, not an EMC user.

[Regnar]

I have the same setup as you just no c11 board. As ger said you need to put in 8 for the micro steps. Also you should know that if your acceleration doesnt accelerate fast enough the machine might not reach top speed before it reaches the end of the desired direction. Hope it helps you out.

[SpeedsCustom]

Ok! So i'm on the right track. I put in 8 today earlier and was getting much higher speeds. I want my speed too be around 30 IPM. I will need too mess with the acceleration because I'm losing steps it seems. I don't think I should be losing steps though, I mean 30 IPM is not that far from being possible.

Maybe just some more tweaking. Do you agree Regnar?


-Jason

[SpeedsCustom]

Ok so, 8 microstepping is working.

But I'm losing steps even at 19 IPM. I really thought I could be going higher, shouldn't I be? The only thing I can think of is, power supply even though at 24 volt / 6 amps it's not giving enough.

But will going too 30 help that much more?


I just feel like I should be able too obtain more then 20 without skipping.


-Jason

[acondit]

Hi Jason,

Let's see you have 8 * 200 * 20 = 32000 step signals per inch. So (32000steps/in x 19ipm) / 60sec/min = 10,133 steps per second at 19 ipm or (32000steps/in x 30ipm)/60sec/min = 16000 steps per second at 30 ipm. I don't know what the maximum steps per second that you pc can generate.

Then lets look at rpm. 19 ipm x 20tpi = 380rpm and 30ipm x 20tpi = 600rpm. So if you don't have resonance dampers on you stepper motors it is possible that you have hit a resonance problem.

The other possibility is a power supply limitation. That may just be the limit of what you can get with 24volts. I am running a 32volt supply with about 15 amps and different drivers (not necessarily better). On my lathe I have pac sci P22 steppers and on the z axis I can easily hit 75ipm with a 5 tpi ballscrew but on the x axis with a 20 tpi screw and a 4:1 reduction belt drive I get only 8ipm. With direct connection that should give 32ipm at the same motor rpm. (I don't have resonance dampers so my stepper/drive combination seems to max out about 600 rpm).

I hope this helps.

Alan

[SpeedsCustom]

Acon- Yea it makes sense. I still feel the computer is capable. It's an older HP but everything on the comp is strictly for EMC. Nothing else is on it, no music or anything. It's possible though.


Here is what I noticed. On this new system, (New board I mean) I'm using the 24 volt @ 6 amp PS. Ok, so as of now....It seems like I can only get maybe 15 IPM (Thats a rough estimate) Because at 19 IPM I start skipping, so lets say 15 IPM.

My old system (From ebay) with a output of "ONLY" 9 VDC @ 17.0 Amps gave me a jogging speed of 12 inches a min with no Skips. I would start skipping in programs running higher then 7 on rapids.


But even if I only obtain 3 -8 more IPM almost doesn't seem worth it.


So there is something tricky going on. One PS with 9 VDC @ 17 amps jogging at 12 IPm and 24 volt @ 6 amps only getting around consistent 15 IPm.



Sound weird???


-Jason

[cjdavis618]

After reading where your at Jason, I think we need to remove the microstepping. At the very leat move it to either 1/4 or 1/2 microsteps. When I had problems with the Z axis missing steps, I moved it to 1/4 and that solved the problem before the counter wieght.

That was the same setup you have +1 axis on a SX3 with a 100lb head. And I could make it move up at 15ipm.


The only difference between what I have and you are the motors and the leadscrews and EMC2. Mine were .200 pitch (1/5") I was getting 30 very easily. I was using Mach3 and the 425oz motors.

I have heard that the Xylotex boards did not compensate for resonance damping. Maybe building a damper would help you out for the axis. Are your steppers dual shaft?

[SpeedsCustom]

Yes the motors are dual shaft. So that requires the actual board settings too be changed. I couldn't find any information on the microstepping in the manual. There is a PDF but it leads too nothing with no explanation.

I assume it's the jumpers behind each heatsink. It has too be. Hopefully this will increase speed.




-Jason