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Messages - chad

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General Mach Discussion / Re: 28800 to move one inch
« on: December 06, 2006, 08:08:28 PM »
I agree with everything below.  Basically it is what it is. The gearing and pitch and motors/encoders dictate what that number is. On my BP clone my x axis 100,000 , y is 100,000 and my z is 50,000 steps per inch.

Now these big numbers really start to count when you factor in speed. I have a grex so i have pretty much no speed limit, but mach is good to 45k for a licensed version and that wouldn't allow me to get full speed out of my servos..


Tangent Corner / Re: CNC telescope mirror grinder.
« on: December 06, 2006, 06:02:38 PM »
Hey just after a quick google search i found this site. Lots of info and she is in your neck of the woods.

I would have thought it to be impossable for the home brew guy but maybe not. 

In case you haven't found it yet here is the link.


some others



Looks like it could be fun. you will need art to write a "random function for you" and steppers might be a problem because of the indents in the stepper.


Found some more



Then all you would need is to get a nice ccd to mount to the end , then use mach for the dec and az and you could have a mach controlled self tracking telescope.

My big question is how you do the e beam vacuum deposition for the metalized layer and then the subsequent Ar coating at home.  (used to work with lasers and in a planetarium)

General Mach Discussion / G-100 update (from art)
« on: December 06, 2006, 05:32:11 PM »
Hi all:

With all the discussion on the Pod and other external devices, I wanted to keep the G100 owners updated on whats going on, I know its been a long slog for you guys. (Hey I have one too. :) ) , so in order too keep the information coming out, I contacted Steve and had a discussion of whats up with G100. As some of you know,
we discovered alot of limitations in the current plugin, due mostly to the methodology of the way we dealt with it. (it was the first plugin written..). Ive learned alot since , and Steve has been working on an API for a programming interface to it. An awfull lot of problems were found and fixed.

The FPGA has been tightened and has monitoring in it, and a debug facility has been written to aid us in the final plugin version, It is underway, and though its taken awhile to get there, we hope youll see some action soon in terms of things changing and a new plugin with the current limitations gone. I did look this week at upgrading the plugin to clean it up interface wise, but its not worth doing out of context of the updated library, so be patient a bit longer and we'll have somethign for you. Now that the Pod is about done, we'll be pressing on in G100 land till we see some results that work well..

Ive heard from some discouraged with the time factor, but I must say 95% of the G100 owners have been quite patient and understanding, this note is to let you know your not forgotten and things are progressing. Having an API will be a boon and will help eliminate the current sporadic errors some get with trasnmisission timing. Im told (as much as I hate rabbits..) that I'm not really blaming the right component, th rabbit actually has lots of power left to do more complex functions, and the bottlenecks Ive faced were from other causes, so I may have been giving Rabbits a bum rap, it may be doing alot more work in future in final releases.. and the capability should be quite high. (As I said in previous letters, Id like to have quite a variety of devices in the end, all with various capabilities that can be matched to the end requirement of an application your using..

Anyway, I wont drone on, but I wanted to make sure no-one was getting discouraged thinking the Pod would replace the G100, or that you wouldnt get your firmware, while delayed for many reasons on both sides of the development equation, we will be working on it in earnest, and Ill keep you posted occasionally on where we are. When it gets close to testing phase, Ill ask you all for a list of those that have one, and will send you all updates as test runs as they are compiled..


General Mach Discussion / Re: Mach to DeskCNC?
« on: December 06, 2006, 04:08:30 AM »
What is the deal with the SD card. I am assuming that you intend on this thing runnng standalone at some point..
The board looks great. What are you using for the u-controller?


General Mach Discussion / Re: Help! Please! this Chaos has to stop!
« on: December 06, 2006, 03:59:47 AM »
A couple of things. First usually you want to start out high in the g code and then slow down the feed, not crank it up. The override will try to makes things faster than your motor tuning.

Second your acceleration and velocity sounds too fast back them down 25% and try that for a while.
also just for fun in the step and dir pulse width try setting it to 5ms.

It sounds to me like you are just trying to run things right on the edge. These are steppers not servos, steppers loose power the faster they go.



Polls / Re: Does your computer remain slow when Mach has closed down?
« on: December 05, 2006, 10:04:43 PM »
Hi Benny, Is it just the mouse, video or is it everything?


Feature Requests / Re: Threading on the Lathe for GRex!
« on: December 05, 2006, 05:35:45 AM »

A lot of us are waiting on g-100 stuff. Unfortunally it is isn't art or Mach's hands at the moment. We are all waiting on an new firmware update to address some issues, and spindle sync (mill and lathe) are on that list.


General Mach Discussion / Version 2.020 is online
« on: December 01, 2006, 11:30:42 PM »
Hi All

Version 2.020 is online. It repairs various feedhold issues, a newly found error in velcoity calculation in small segment mixes at high speed. It also inclused a new LazyCam version.


Feature Requests / 5-Axis Kinematics.
« on: December 01, 2006, 01:02:06 AM »
Ok here it is. The Official start of my pain in the butt 5-axis begathon.

I would like Mach to do the math for tool length offset in a 5-axis machine.

Simple!  :D


Feature Requests / Stock and work probing
« on: December 01, 2006, 12:52:00 AM »
This could be tied together with the work offset post above.

I would like to see some more probing functions built in to mach. Things I would like to see are the ability to set the probe diameter, jog into the x and y edges and have mach set the dro's to 0,0. Also some basic measurment stuff would be great. The ability to to find the centers of holes, measure from one hole to another, basic cmm stuff.


ps. I know poll's have a section but i wanted an easy way to judge feedback.

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