using DRO
15 Mar 2011 19:14 #7862
by yonnie
I have a CARMAR SW3000 on my Bridgeport with linear scales, love it. The backlash in this old mill is all over the place, it's not constant as the lead screw has wear that is un-even over the length of it. Counting turns/steps etc... won't be accurate.
I have not found in this forum any articles pertaining making use of Linear scales or existing DRO. The SW3000 has an RS232 port, I'd like to figure out how to put it to good use.
Would someone please point me in the right direction?
I have not found in this forum any articles pertaining making use of Linear scales or existing DRO. The SW3000 has an RS232 port, I'd like to figure out how to put it to good use.
Would someone please point me in the right direction?
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15 Mar 2011 20:20 #7867
by andypugh
Replied by andypugh on topic Re:using DRO
yonnie wrote:
You could use the glass scales to create a screw-compensation map, which should compensate for backlash and uneven wear:
wiki.linuxcnc.org/cgi-bin/emcinfo.pl?Screw_Compensation
I believe that is what is used on this machine, and it seems to work. You can see the slight kicks on reversal.
Alternatively you could try to correct position using the scales. I don't actually know if anyone has had much success with this approach.
wiki.linuxcnc.org/emcinfo.pl?Combining_T..._Devices_On_One_Axis
I will point you in two directions, it is up to you to decide which is the right one.Would someone please point me in the right direction?
You could use the glass scales to create a screw-compensation map, which should compensate for backlash and uneven wear:
wiki.linuxcnc.org/cgi-bin/emcinfo.pl?Screw_Compensation
I believe that is what is used on this machine, and it seems to work. You can see the slight kicks on reversal.
Alternatively you could try to correct position using the scales. I don't actually know if anyone has had much success with this approach.
wiki.linuxcnc.org/emcinfo.pl?Combining_T..._Devices_On_One_Axis
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