Messages

921

General Mach Discussion / Re: home/limit switch problems

« on: November 06, 2016, 05:03:04 PM »

Hard to say - your case is a little difference as i used NPN and you have PNP, my led's flickered on the sensors, yours do not.

Might work but i have doubts due to your leds' not flickering.

922

General Mach Discussion / Re: home/limit switch problems

« on: November 06, 2016, 02:20:29 PM »

5V inputs

ah, ok.




Thats why i prefer NPN - does not matter what the supply voltage is so going from 12 to 24v is easy.

Found an old video of my proxy weird behaviour...
https://youtu.be/S5PP5sQh5Vk

923

General Mach Discussion / Re: home/limit switch problems

« on: November 06, 2016, 02:02:30 PM »

if these are the cheap proxies  from eBay i had the same issue exactly - it only worked properly when i switched to a 24v supply to them.

It says 12-24v i think but they flickered like hell on 12v, perfect on 24.

What s the reason for the 10k on the inputs?

924

CS-Lab / Re: IP-A and Servo drives, voltage matching...

« on: November 05, 2016, 10:12:09 AM »

Thanks Mike

The best tune i can get is manually and gives around 300 count following error when doing rapid jogs back and forward, encoders are 10,000 count.

I cannot tune the amp to motor as it is 'supposed' to be automatic just by setting the motor type parameter, the manual is in heavy Chinglish so not much help.

The drives and motors came from China via AliExpress store.

The parameters are all there but without knowing exactly what to do, i would not fiddle with them.

925

General Mach Discussion / Re: Hybrid stepper motors from e bay

« on: November 04, 2016, 07:37:15 AM »

Ok, thats a 3Nm motor then, should be ok on screws, is that direct drive or belt drive with reduction ratio?

Any chance of a picture?

Is it skipping on the axis with slaved motors or the one with a single motor?

926

General Mach Discussion / Re: Mdi is not a MODE

« on: November 04, 2016, 03:20:35 AM »

Don't you just love Mach3

As it happens I do, but yes there are very few safety constraints in there - the CS-labs box was not around when Mach was written either

The hardest part is adding the logic to control human input - mach will do what you tell it, but if you tell it to run the code when not expecting it to, it will usually run the code as you found - this is not really a flaw i think, Mach is pretty much just a controller - you have to add the bells and whistles as i have been doing

How do you select the MDI screen, maybe there is a way in there, my screenset does not have it - the MDI is just a line on the main screen activated by pressing enter or clicking in it. Stopping the code running should be possible, its just a matter of where to apply the block and what triggers it.

927

General Mach Discussion / Re: Hybrid stepper motors from e bay

« on: November 04, 2016, 03:11:16 AM »

What is your acceleration set for in motor tuning?

May be worth trying the 1/10 rule - say speed is set for 5000mm/min then acceleration would be set for 500mm/s/s - its not a hard and fast rule, just something i have works great as a starting point.

How big is the machine? For some odd reason i was thinking small but it looks big

I see motors are Nema23 but what size 3Nm, 4Nm ??
Current settings in the driver?
Is it rack & pinion ?

928

General Mach Discussion / Re: Backlash...

« on: November 03, 2016, 01:09:34 PM »

LOL

929

General Mach Discussion / Re: Hybrid stepper motors from e bay

« on: November 03, 2016, 09:08:15 AM »

If its only losing when pushing it , that sounds pretty normal to me, there is only so much the motors can do.

As you say, its a new issue so i would not be looking at wiring.


By the way, the picture below is of a so-called commercial plasma table controller, a perfect illustration of how NOT to wire up

930

General Mach Discussion / Re: Backlash...

« on: November 03, 2016, 07:54:50 AM »

Nah, no problems as such - I just like to know 1-am i getting the best out of my machines and 2-am i doing any damage by doing whatever on them
I knew there would be backlash - I have not used maximum quality ball-screws and its a jelly-like Bridgeport mill with many decades of abuse under her belt

Below is a picture of my mini-mill, it was built for cutting aluminium parts which have now been moved to the Bridgport, the engraving was a bonus really, the picture below was done on the mini-mill, settings were likely far from correct as it was a while back now. I was surprised how similar the result is, the Bridgeport was slightly better i think most likely due to the mass of the machine.

The mini mill has 20mm HiWin linear guides all round, dual ball screws on Y and single on X and Z, runs on a UC100 controller.

Your engraving machine looks a nice little build, excellent detail work.