Machsupport Forum

Mach Discussion => General Mach Discussion => Topic started by: VOTS on February 15, 2007, 12:14:40 PM

Title: Simple question: Z-Axis and the Feed rate
Post by: VOTS on February 15, 2007, 12:14:40 PM

If I set the Z-axis feed rate to less then 1In Per minute, I.e. trying for 1/2" (F0.50)to go r e a l l y slow, either my servo controller or Mach3 isn't interpreting it correctly and it goes faster then a bullet. I darn near blew the servo on the Z-axis due to this. 1In per min is just a wee bit to fast when your using 1/16 and smaller end mills.

Title: Re: Simple question: Z-Axis and the Feed rate
Post by: Brian Barker on February 23, 2007, 10:08:02 AM

I just tested it here and it is working... it could be the settings that you have for your machine... What are your steps per unit?

Title: Re: Simple question: Z-Axis and the Feed rate
Post by: VOTS on February 23, 2007, 10:24:07 AM

Not sure how to look that up. i have figured out that it will move that slow. I think I have an issue with the actual CNC controller here. If I stop the run and then restart it, it invariably will snap off my bit. Just learned to setup more properly so I don't have to stop for adjustments.

:)

Title: Re: Simple question: Z-Axis and the Feed rate
Post by: Brian Barker on February 23, 2007, 10:31:18 AM

O so it could be a restart problem...  could you please tell me how you are restarting the program?


Thanks
Brian

Title: Re: Simple question: Z-Axis and the Feed rate
Post by: VOTS on February 23, 2007, 11:32:05 AM

Now I just use feed hold (Space bar). Before I was hitting Stop (Alt-s). Using Stop, it would continue from where it left off, but it would be going at Mach3. (Pardon the pun)

Title: Re: Simple question: Z-Axis and the Feed rate
Post by: Brian Barker on February 24, 2007, 05:38:12 PM

Yes, you need to use Feedhold and not stop... 

Title: Re: Simple question: Z-Axis and the Feed rate
Post by: VOTS on February 25, 2007, 03:04:13 PM

Is there a way to set a maximum 'speed' for an axis? I.e. I'd like to set it up where no matter what my g-code tells the controller, the Z-axis will only go up to a certain speed? Been reading the Mach3 document and haven't found anything like that...yet.

Thanks!

Title: Re: Simple question: Z-Axis and the Feed rate
Post by: Hood on February 25, 2007, 05:22:36 PM

Whatever your motors are tuned to will be the max.
Hood

Title: Re: Simple question: Z-Axis and the Feed rate
Post by: VOTS on February 25, 2007, 08:33:35 PM

OK, I found the motor Tuning area. Thought that would be something entirely different. Reading....

thanks!