Messages

1541

General Mach Discussion / Re: Reversed machining

« on: March 03, 2013, 06:21:27 PM »

You may well have the axis going in the wrong direction.  This can be fixed by reversing the axis in homeing and limits, or changeing the active state of your driection pins in motor outputs or moveing the wires on the motor or drive.  Have a look at the members doc board or google Right hand rule for CNC.  For now, stick with the first option listed above if you need to swap directions.

Brett

1542

General Mach Discussion / Re: Lost at low speeds

« on: March 03, 2013, 06:14:13 PM »

The higher the number in accel, the faster you will be able to ramp up velocity.  But if you try to do it faster than your machine can stand it will skip steps and possibly stall.  In other words, the faster it will go from stopped to wide open.  But, this is all a balanceing act.  I want my accles and vel to be as high as the machine can stand (takeing into consideration tool load + 100% safety factor) but what that will be for you is anyones guess.  You will just have to play and see.  I do think you will like the 10,000 steps per better though.  Have a look in the members doc board.  There is some information to help you with your backlash.

Brett

1543

Modbus / Re: Modbus Slave simulator

« on: March 03, 2013, 03:53:08 PM »

OK you got it

Ian

Goodness gracious at the the misunderstnadings there..............  

I had no idea what you guys were talking about till I googled it:

"In Greek mythology Sisyphus was a king of Ephyra (now known as Corinth) punished for chronic deceitfulness by being compelled to roll an immense boulder."

You kids, have a toast and lets all get over any misunderstandings.

Sorry, I never ment for ill feelings to be unearthed. We are here to have fun first, and share knowledge or/and experiences.
Nothing should be taken personal. I'm too old to believe it is my way or the highway anymore. Don't really give a crap, I just do my thing and enjoy what time is left. And pity my family and the auctioneer when they have to sell off all this stuff. lol

Absazactly

Brett

1544

General Mach Discussion / Re: Lost at low speeds

« on: March 03, 2013, 02:35:38 PM »

When you say round to the next step, I assume Micro Step?

Exactly

Not sure you will get much more torque, I'd say that has more to do with the drive really but yes, if you change your steps per to 5000 by changeing the microstep option from 1000 to 400 you will get a res. of .00025.  If you avoid microstepping all together you will get a res. of .001 either would work but I think it will be much smoother at 10,000.  You will just have to play and see what suits your needs best.

Brett

1545

Modbus / Re: Modbus Slave simulator

« on: March 03, 2013, 02:26:28 PM »

   I'm sorry Ian, your right.  Nothing wrong with the name................ unless you have it of course.     I mean really, just say it out loud once.  Makes me blush.......... 

Brett

1546

General Mach Discussion / Re: Lost at low speeds

« on: March 03, 2013, 01:18:33 PM »

Well, 10,000 steps per will give you .0001 resolution.  What you need or want, I have no idea.  It also means that at a kernal speed of 25KHz you can travel at 150 IPM (if your machine is capable of that).  I would set the micro stepping to where I could get the reseloution, and speed I want as smoothly (best sound) as possible.  Its best if your steps per divide by your desired resoloution equaly as well. If your trying to get a resolution of .0001 and your steps per were 16,000, you could'nt hit your resolution evenly so it would have to be rounded to the nearest possible step.

https://www.youtube.com/watch?v=bngx2dKl5jU&list=HL1362334138

Brett

1547

Modbus / Re: Modbus Slave simulator

« on: March 03, 2013, 01:06:38 PM »

BTW where's MY apology from all those that deeply upset ME when they took the piss over Sysiphus - you KNOW who you are )

Ian, please accept my deepest and most sincere apologies for taking the piss with you over Sysiphus.  I had no intentions on making your miseries bare down on your get worsers.  I'm sorry I hurt your feel bad, I truly am.  But in my defense, it was a simple misunderstanding.  I just wanted to know what made the guy tougher?  The stone or middle school?  I mean really, with a name like that........ I think my question has merit.   

1548

General Mach Discussion / Re: Lost at low speeds

« on: March 03, 2013, 12:54:27 PM »

- Micro stepping = 10. So 200 X 10=2,000 (Not sure about this but seems true)

Also on the side of the Driver(s) it has a list of dipswitch settings for Pulse./rev I picked 1000.

If the drives are set to take 1000 steps per rev on a 1.8 degree stepper motor, this is 5 microsteps per each 1.8 degree full step.  So it would be 200 x 5 = 1000 x 10 (.1 lead on the screw) would make the steps per 10,000

Brett

1549

General Mach Discussion / Re: Lost at low speeds

« on: March 03, 2013, 11:02:07 AM »

I am pretty sure the motor tuning step counts are close because at high speed it repeats 5 times in a row, but at slow speeds it won't repeat.

This is a hard known number and does not change.  This needs to be the very first thing that your posotive about.

http://www.machsupport.com/forum/index.php/topic,12512.0.html#new
http://www.machsupport.com/forum/index.php/topic,16315.0.html#new

Double check this and we can go to step 2.

Brett

1550

G-Code, CAD, and CAM discussions / Re: How to activate & deactivate an output once every 5 seconds in G-code or macro?

« on: March 03, 2013, 01:20:17 AM »

Welcome to the forum Andrew, That will be easy enough but I'll let some of the macro gurus chime in on this.


Disclaimer!!!  Please realize ethanol is flameable!!!!
The injector is a good idea for a mister.  If all your machining is Alum., check into to using ethanol for coolant.  A good friend runs a lot of alum. sheets on his router and is loving it so far.

Brett