New Build - CNC Plasma Table

All things related to the Centroid Acorn Plasma system.

Moderator: cnckeith

landmark573
Posts: 53
Joined: Mon Jun 24, 2019 3:30 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: none

Re: New Build - CNC Plasma Table

Post by landmark573 »

I'm warming up to the idea. Maybe I will start by welding up the frame. I have rolled it in and out of the garage hundreds of times with it just being tacked together :lol:
ShawnM
Posts: 1210
Joined: Fri May 24, 2019 8:34 am
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: 7804734C6498-0401191832
Location: Clearwater, FL

Re: New Build - CNC Plasma Table

Post by ShawnM »

That would be a great start, a good, solid, heavy machine bed is always better.
landmark573
Posts: 53
Joined: Mon Jun 24, 2019 3:30 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: none

Re: New Build - CNC Plasma Table

Post by landmark573 »

This gear motor looks interesting. It has a 12mm keyed output shaft.

https://www.ebay.com/itm/333582829153?m ... media=COPY
ShawnM
Posts: 1210
Joined: Fri May 24, 2019 8:34 am
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: 7804734C6498-0401191832
Location: Clearwater, FL

Re: New Build - CNC Plasma Table

Post by ShawnM »

landmark573 wrote: Wed Aug 31, 2022 7:17 pm This gear motor looks interesting. It has a 12mm keyed output shaft.

https://www.ebay.com/itm/333582829153?m ... media=COPY
Stepperonline has a bunch of great products. Have a look at their website. Many forum members have purchased from them. Just make sure you can get the proper pinion gear for a specified motor shaft BEFORE you buy it. They also sell real good stepper drives that are rather inexpensive as well.
repauli1
Posts: 132
Joined: Thu Jul 09, 2020 9:50 pm
Acorn CNC Controller: No
Allin1DC CNC Controller: No
Oak CNC controller: Yes
MPU11 & GPIO4D -w/ 3rd Party Drives: No
DC3IOB: No
CNC12: Yes
CNC11: No
CPU10 or CPU7: No
CNC Control System Serial Number: none

Re: New Build - CNC Plasma Table

Post by repauli1 »

Have you looked at the 3:1 avid cnc belt reducers, they work great.
landmark573
Posts: 53
Joined: Mon Jun 24, 2019 3:30 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: none

Re: New Build - CNC Plasma Table

Post by landmark573 »

repauli1 wrote: Thu Sep 01, 2022 7:10 am Have you looked at the 3:1 avid cnc belt reducers, they work great.
Thanks for the suggestion. I have looked at the avid belt reducers. Unfortunately, I would have to replace my racks and carriages to use them. I was hoping to just add gearboxes to my existing motors. But I'm having trouble finding parts that will fit.

I just looked at your build thread. Your table looks great. In one of your videos cutting the "hook" demo part it looks like the feed rate was accelerating going into the curves just like what I'm seeing with mine. Have you had an issue with that?
landmark573
Posts: 53
Joined: Mon Jun 24, 2019 3:30 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: none

Re: New Build - CNC Plasma Table

Post by landmark573 »

I found a 5:1 gearbox that will fit my existing nema 23 motors. It says the no load backlash is <= 15 arcmin. Most other gearboxes I’ve looked at are rated at .8 degree. If I understand arcmin’s correctly then 15 arcmin would be much better at .25 degrees. That sounds like an acceptable amount of backlash, right?

https://www.omc-stepperonline.com/ple-s ... le23-g5-d6
ShawnM
Posts: 1210
Joined: Fri May 24, 2019 8:34 am
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: 7804734C6498-0401191832
Location: Clearwater, FL

Re: New Build - CNC Plasma Table

Post by ShawnM »

It is what it is, you cant change it so why worry. Those are nice gearboxes, a local guy near me has those same gearboxes. Just make sure your machine and frame is solid and everything is bolted tight and critical hardware has Loctite on everything. Once all that is done and you have the mechanical backlash to a bare minimum you can take out the rest of the backlash in the software, that is if it's very minimal. Backlash compensation will not help you if you have a poorly constructed machine but will help with the minimal backlash in the gearboxes. Build the best, solid machine you can to start with.
Post Reply