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Emcoturn 120 lathe retrofit
Emcoturn 120 lathe retrofit
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14 Aug 2016 21:11 - 14 Aug 2016 21:12 #78773
by LutzTD
looks like its all working now. I can see all three channels in the HAL oscilloscope. Im worried 1800 pulses may be too fast, but Ill address that later. Next is the axis home switches.
Last edit: 14 Aug 2016 21:12 by
LutzTD.
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14 Aug 2016 22:09 - 14 Aug 2016 22:12 #78778
by PCW
1800 counts per turn should be fine, the 7I76e encoder counter can count faster than any standard encoder
(up to ~25 MHz). It may be that the encoder would need lower value pull-up resistors than the 7I76e's built in 2K resistors
if the count rate is very high but I don't think that would be the case with a lathe spindle.
Last edit: 14 Aug 2016 22:12 by
PCW.
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15 Aug 2016 00:56 #78782
by LutzTD
thats great thanx. Its only for threading I guess so it wont be trying to read it at high rpms anyway. For the home switches the emco has 2 24vdc hall sensors. I assume I just power them and then put the hall sensor output as an input? When I set up the linuxcnc I think I put in for home switches, what would the entry in the HAL file look like and what pins would it assign? Or would I need to chose the pins to assign?
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15 Aug 2016 02:15 #78783
by LutzTD
here are the lines added by the setup tool. This will be OK for a start if I can figure out the physical pin from the HAL pin. But what I would like to do is set up an output to power the hall sensor when the home search begins, an input to read the result (should be below I think), then turn off the hall sensor the rest of the time.
# --- HOME-X ---
net home-x <= hm2_7i76e.0.7i76.0.0.input-00
# --- HOME-Z ---
net home-z <= hm2_7i76e.0.7i76.0.0.input-01
---setup home / limit switch signals---
net home-x => axis.0.home-sw-in
net x-neg-limit => axis.0.neg-lim-sw-in
net x-pos-limit => axis.0.pos-lim-sw-in
# ---setup home / limit switch signals---
net home-z => axis.2.home-sw-in
net z-neg-limit => axis.2.neg-lim-sw-in
net z-pos-limit => axis.2.pos-lim-sw-in
ini
HOME_OFFSET = 0.000000
HOME_SEARCH_VEL = 0.050000
HOME_LATCH_VEL = 0.016667
HOME_FINAL_VEL = 0.000000
HOME_USE_INDEX = NO
HOME_SEQUENCE = 1
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15 Aug 2016 02:23 #78784
by LutzTD
I assume its these pins? Sorry I know this is really easy for programmers but its all completely new to me.
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15 Aug 2016 14:19 #78801
by PCW
Yes, hm2_7i76e.0.7i76.0.0.input-00 is the hal pin that corresponds to TB6 pin 1
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16 Aug 2016 15:15 #78867
by LutzTD
would it make sense to create a custom m-code to turn on and off the home switches then call these as part of the homing routine?
M110
#!/bin/bash
# file to turn on home switches at output 1
halcmd setp hm2_7i76e.0.7i76.0.0.output-00 True
exit 0
M111
#!/bin/bash
# file to turn off home switches at output 1
halcmd setp hm2_7i76e.0.7i76.0.0.output-00 False
exit 0
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Hardware & Machines
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Emcoturn 120 lathe retrofit
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