Techno-Isel CPM-3020 CNC Router Acorn Conversion

All things related to the Centroid Acorn CNC Controller

Moderator: cnckeith

Post Reply
762x51
Posts: 118
Joined: Wed Aug 02, 2017 8:40 pm
Acorn CNC Controller: Yes
Allin1DC CNC Controller: No
Oak CNC controller: No
MPU11 & GPIO4D -w/ 3rd Party Drives: No
DC3IOB: No
CNC11: No
CPU10 or CPU7: No
System Serial Number: B0D5CC56DD75-0605170063 , 985DAD4295CF-0928170127 , 38D2694E4703-1222170401
Location: Near Guilford College, Greensboro, NC
Contact:

Techno-Isel CPM-3020 CNC Router Acorn Conversion

Post by 762x51 » Sun Dec 03, 2017 3:33 pm

At the end of July I picked up a Techno-Isel CPM-3020 Router and initially thought I’d convert it to a MACH 3 or 4 based system using a GECKO G540 and then I heard about the Acorn. After a lot of reading and watching Marty’s videos, I decided that the Acorn would be a better way to go.
Here is a photo of the router when I went to pick it up at the school where I bought it.

Image

After I got it home I contacted the manufacturer and found that they wanted around $500 for the simple software program that was needed to use the existing controller shown here:

Image

After deciding to go with the Acorn, I removed the existing controller, bought an Acorn, and made a sub-panel from a piece of sheet aluminum to mount all of the devices. Here is a photo of getting started making the new sub-panel.

Image

Here is a photo of it taken last night once I had it up and running. As you can see there is a “rats nest” of wires that I need to clean up.

Image


I also need to change the wire color for the 5 VDC wiring to orange as yellow is the color that should be used for logic 24 VDC power. I haven’t mounted and wired the spindle motor control relay yet because I didn’t want to have any chance of the spindle starting while I was doing testing.
The next “chore” is to calibrate the XYZ axis and I hope to start that this evening.
Here is a photo of the work area and the white part on the spindle mount is a dust collector sweep mount that I made on a 3D printer. The horseshoe shaped piece will have the brush mounted and it’s held to the base plate by magnets.

Image

MecTechMike
Posts: 10
Joined: Thu Aug 10, 2017 8:59 pm
Acorn CNC Controller: Yes
Allin1DC CNC Controller: No
Oak CNC controller: No
MPU11 & GPIO4D -w/ 3rd Party Drives: No
DC3IOB: No
CNC11: No
CPU10 or CPU7: No
System Serial Number: none

Re: Techno-Isel CPM-3020 CNC Router Acorn Conversion

Post by MecTechMike » Mon Dec 04, 2017 9:21 pm

Nice job. Let us know once you get it going.

762x51
Posts: 118
Joined: Wed Aug 02, 2017 8:40 pm
Acorn CNC Controller: Yes
Allin1DC CNC Controller: No
Oak CNC controller: No
MPU11 & GPIO4D -w/ 3rd Party Drives: No
DC3IOB: No
CNC11: No
CPU10 or CPU7: No
System Serial Number: B0D5CC56DD75-0605170063 , 985DAD4295CF-0928170127 , 38D2694E4703-1222170401
Location: Near Guilford College, Greensboro, NC
Contact:

Re: Techno-Isel CPM-3020 CNC Router Acorn Conversion

Post by 762x51 » Tue Dec 05, 2017 8:44 am

Good Morning and thanks for your nice comment regarding the layout but I should have used DB9 breakouts instead of cutting off one end of the cables and wiring direct to the various terminals. That was a big mistake and it really added a lot of time to getting the panel wired. Live and learn....

I have it up and running except for the spindle and I have left it unconnected while I go through the calibration process. The router has 4mm pitch ball screws so I'm calibrating in metric units. The initial setup was 200 steps/rev (1.8 deg steppers) and 4 microsteps (800 steps/rev) which was what Isel suggested but I have found that with 16 microsteps (3200 steps/rev) the accuracy is improved and the steppers run much quieter and smoother.

Right now it looks like I'm going to have to tweak the axis ratio a little. I set the ratio at 4 but the XYZ axis appears to be off by approximately 0.04mm or 0.00157 inches. I want to try to get the XYZ axis as close to "perfect" as I can because the primary use will be to use the router as a cheap CMM machine to reverse engineer antique firearm parts.

Orin

DICKEYBIRD
Posts: 252
Joined: Sat Jul 08, 2017 7:38 am
Acorn CNC Controller: Yes
Allin1DC CNC Controller: No
Oak CNC controller: No
MPU11 & GPIO4D -w/ 3rd Party Drives: No
DC3IOB: No
CNC11: No
CPU10 or CPU7: No
System Serial Number: n/a yet
Location: Collierville, TN USA

Re: Techno-Isel CPM-3020 CNC Router Acorn Conversion

Post by DICKEYBIRD » Tue Dec 05, 2017 9:29 am

762x51 wrote:
Tue Dec 05, 2017 8:44 am
The initial setup was 200 steps/rev (1.8 deg steppers) and 4 microsteps (800 steps/rev) which was what Isel suggested but I have found that with 16 microsteps (3200 steps/rev) the accuracy is improved and the steppers run much quieter and smoother.
Hiya Orin, nice machine you have there! Are those Leadshine drives or clones thereof you're using? I have the Longs Motor DM542 clones running 8 microsteps and they don't sound particulary smooth. Didn't try 16 microsteps yet but need to try it & see! Thanks for posting that. :)
Milton in Collierville, TN

"Accuracy is the sum total of your compensating mistakes."

762x51
Posts: 118
Joined: Wed Aug 02, 2017 8:40 pm
Acorn CNC Controller: Yes
Allin1DC CNC Controller: No
Oak CNC controller: No
MPU11 & GPIO4D -w/ 3rd Party Drives: No
DC3IOB: No
CNC11: No
CPU10 or CPU7: No
System Serial Number: B0D5CC56DD75-0605170063 , 985DAD4295CF-0928170127 , 38D2694E4703-1222170401
Location: Near Guilford College, Greensboro, NC
Contact:

Re: Techno-Isel CPM-3020 CNC Router Acorn Conversion

Post by 762x51 » Tue Dec 05, 2017 11:43 am

Hi Milton,

I'm using these stepper drivers https://www.amazon.com/gp/product/B00DF ... UTF8&psc=1 Low cost and they appear to be working just fine.

Like I said, there was some improvement in the accuracy by changing the steps/rev but the change in stepper sound and smoothness was really great. They were really noisy at 800 steps/rev and now they kinda sound like a buzz or buzzy hum. I'll be increasing the steps/rev to see if 3200 is the "sweet spot" or if some other setting would be better.

Orin

martyscncgarage
Posts: 725
Joined: Tue Mar 28, 2017 12:01 pm
Acorn CNC Controller: Yes
Allin1DC CNC Controller: Yes
Oak CNC controller: No
MPU11 & GPIO4D -w/ 3rd Party Drives: No
DC3IOB: No
CNC11: Yes
CPU10 or CPU7: No
System Serial Number: none
Location: Mesa, AZ

Re: Techno-Isel CPM-3020 CNC Router Acorn Conversion

Post by martyscncgarage » Wed Dec 06, 2017 12:07 pm

Coming along nicely Orin. Nice work!
Hopefully you will be fully operational soon. Just going to use a relay to turn on/off the router?
Marty
"Jack of all trades, master of none!"
Mesa, AZ

762x51
Posts: 118
Joined: Wed Aug 02, 2017 8:40 pm
Acorn CNC Controller: Yes
Allin1DC CNC Controller: No
Oak CNC controller: No
MPU11 & GPIO4D -w/ 3rd Party Drives: No
DC3IOB: No
CNC11: No
CPU10 or CPU7: No
System Serial Number: B0D5CC56DD75-0605170063 , 985DAD4295CF-0928170127 , 38D2694E4703-1222170401
Location: Near Guilford College, Greensboro, NC
Contact:

Re: Techno-Isel CPM-3020 CNC Router Acorn Conversion

Post by 762x51 » Wed Dec 06, 2017 1:08 pm

Hi Marty,

Thanks for the reply and yes, I plan on using RL1/RO1 to energize a isolation relay to control the spindle motor. I bought a couple of the SANWO 24 VDC relays that you mentioned in one of your videos and I'll use that to isolate the Acorn from 120 VAC.

Orin

Post Reply

Who is online

Users browsing this forum: No registered users and 1 guest