× Forum Header

Problem in Spindle Speed readout???

More
23 Jul 2011 17:06 #11771 by acondit
The computer on my lathe crashed (disk drive went south), so I installed a new computer with EMC2-2.4.6.
I was having trouble getting my old config to work, so I used stepconf to generate a new config. I checked the
box to generate a new custom pyvcp panel. I got a spindle speed indicator (which was what I wanted).
However, when I ran the lathe there was no apparent reading in the spindle speed. So after a lot of work,
I discovered that the encoder was working fine, and everything up to the pyvcp display was working.
Below is the custom_postgui.hal file text.
I discovered that setp scale.0.gain was set to 1/60 (.01667) rather than 60. When I changed the value everything worked.
My question is did I do something to cause stepconf to calculate the wrong value or is there a bug in stepconf related
to the calculations for the spindle speed setup?

####custom_postgui.hal
# Include your customized HAL commands here
# The commands in this file are run after the AXIS GUI (including PyVCP panel) starts

# **** Setup of spindle speed display using pyvcp -START ****
# **** Use ACTUAL spindle velocity from spindle encoder
# **** spindle-velocity bounces around so we filter it with lowpass
# **** spindle-velocity is signed so we use absolute compoent to remove sign
# **** ACTUAL velocity is in RPS not RPM so we scale it.

#setp scale.0.gain .01667 ( I replaced this line with the following line)
setp scale.0.gain 60
setp lowpass.0.gain 0.01
net spindle-velocity => lowpass.0.in
net spindle-rps-filtered <= lowpass.0.out
net spindle-rps-filtered => abs.0.in
net absolute-spindle-vel <= abs.0.out => scale.0.in
net scaled-spindle-vel <= scale.0.out => pyvcp.spindle-speed

Please Log in or Create an account to join the conversation.

More
23 Jul 2011 18:41 - 23 Jul 2011 19:00 #11776 by cmorley
This is a bug. It's fixed in EMC 2.5.
Strangely you are the first report I remember of anyone complaining.
Thanks for the report and solution

Chris M

If there ever is a 2.4.7 its fixed there too now.
Last edit: 23 Jul 2011 19:00 by cmorley.

Please Log in or Create an account to join the conversation.

More
26 Jul 2011 00:17 #11855 by acondit
Chris,

Thanks for fixing it in advance of report. You guys are good!!!

Alan

Please Log in or Create an account to join the conversation.

Time to create page: 0.215 seconds
Powered by Kunena Forum