So I bought a unused/used "buildyourcnc"

All things related to the Centroid Acorn CNC Controller

Moderator: cnckeith

drdennis
Posts: 32
Joined: Mon Oct 25, 2021 9:22 pm
Acorn CNC Controller: Yes
Allin1DC CNC Controller: No
Oak CNC controller: No
MPU11 & GPIO4D -w/ 3rd Party Drives: No
DC3IOB: No
CNC12: Yes
CNC11: No
CPU10 or CPU7: No
CNC Control System Serial Number: 0927215221
Location: Newton, MA

Re: So I bought a unused/used "buildyourcnc"

Post by drdennis »

As for the 1422.22 steps per in. the machine I have is sprocket & chain driven, is it telling me that it takes less than 1 motor revolution to travel 1"?
Yes it does, assuming 16x microstepping (3200 for full revolution). Glad you got the math under your belt.
Cheers
cnckeith
Posts: 3631
Joined: Wed Mar 03, 2010 4:23 pm
Acorn CNC Controller: Yes
Allin1DC CNC Controller: Yes
Oak CNC controller: Yes
MPU11 & GPIO4D -w/ 3rd Party Drives: Yes
DC3IOB: Yes
CNC11: Yes
CPU10 or CPU7: Yes
CNC Control System Serial Number: none
Contact:

Re: So I bought a unused/used "buildyourcnc"

Post by cnckeith »

related reading.
viewtopic.php?f=63&t=1801
Need support? READ THIS POST first. http://centroidcncforum.com/viewtopic.php?f=60&t=1043
All Acorn Documentation is located here: viewtopic.php?f=60&t=3397
Answers to common questions: viewforum.php?f=63
and here viewforum.php?f=61
Gear we use but don't sell. https://www.centroidcnc.com/centroid_di ... _gear.html
metalman2
Posts: 18
Joined: Sun Oct 31, 2021 3:25 pm
Acorn CNC Controller: Yes
Allin1DC CNC Controller: No
Oak CNC controller: No
MPU11 & GPIO4D -w/ 3rd Party Drives: No
DC3IOB: No
CNC12: Yes
CNC11: No
CPU10 or CPU7: No
CNC Control System Serial Number: 8113121

Re: So I bought a unused/used "buildyourcnc"

Post by metalman2 »

drdennis wrote: Wed Nov 24, 2021 4:18 pm
As for the 1422.22 steps per in. the machine I have is sprocket & chain driven, is it telling me that it takes less than 1 motor revolution to travel 1"?
Yes it does, assuming 16x microstepping (3200 for full revolution). Glad you got the math under your belt.
Cheers
So if that's the case do I need to set the axis wizard at .8888 rev per inch? Thanks for all your help by the way!
metalman2
Posts: 18
Joined: Sun Oct 31, 2021 3:25 pm
Acorn CNC Controller: Yes
Allin1DC CNC Controller: No
Oak CNC controller: No
MPU11 & GPIO4D -w/ 3rd Party Drives: No
DC3IOB: No
CNC12: Yes
CNC11: No
CPU10 or CPU7: No
CNC Control System Serial Number: 8113121

Re: So I bought a unused/used "buildyourcnc"

Post by metalman2 »

On the drive it has 8 dip switches but no information is given for switch 4 or 8. What should those be set at? I've read to leave them at factory settings but I'm not sure what that was..
metalman2
Posts: 18
Joined: Sun Oct 31, 2021 3:25 pm
Acorn CNC Controller: Yes
Allin1DC CNC Controller: No
Oak CNC controller: No
MPU11 & GPIO4D -w/ 3rd Party Drives: No
DC3IOB: No
CNC12: Yes
CNC11: No
CPU10 or CPU7: No
CNC Control System Serial Number: 8113121

Re: So I bought a unused/used "buildyourcnc"

Post by metalman2 »

drdennis wrote: Wed Nov 24, 2021 4:08 pm Yeah, that's wrong. The Acorn doc is a bit skimpy on defining the DB25 outputs but it is suggesting 5V positive logic, so you have it wired backwards. No worries the LEDs on the CW230 input just won't work like this -- no damage.
You need to feed the DB25 signals to the positive inputs and tie the two negative inputs to the ground (e.g., pin 18)
That worked... I have movement! Thanks
drdennis
Posts: 32
Joined: Mon Oct 25, 2021 9:22 pm
Acorn CNC Controller: Yes
Allin1DC CNC Controller: No
Oak CNC controller: No
MPU11 & GPIO4D -w/ 3rd Party Drives: No
DC3IOB: No
CNC12: Yes
CNC11: No
CPU10 or CPU7: No
CNC Control System Serial Number: 0927215221
Location: Newton, MA

Re: So I bought a unused/used "buildyourcnc"

Post by drdennis »

Great, now you can play with the microstepping and current settings to get more comfortable with what those parameters do in real life. When playing, if you can still touch a motor with your hand (<70 deg C) you are OK.
Regarding the two micro switches you mentioned: 4 and 8, the doc I found contains a pretty incoherent paragraph talking about 1/2 current (while not mentioning which of the two switches controls that). Guessing based on controllers I have used, it is more likely that switch 4 controls that function. The switch allows you to cut the current in half when the motor is stopped. You should be able to play with it and feel the difference as the torque will also be cut in half.
I am guessing the other switch does not do anything. But you can always check if there is any affect. Remember to turn the power off when you play with the switches. Good luck!
Cheers
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