RPi 5 with 6.12 PREEMPT_RT = Using POSIX non-realtime

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14 Jan 2025 00:19 #318907 by TomAlborough
Hello Tom,

Maslow advertizes CNC'ing of wood sheets and that's what I need to do so let me see how far I can go with it and LinuxCNC. BTW Maslow goes at about 1 inch per second so there are no kinematics.

I'll start by locating the LinuxCNC documentation starting point(s).

Thanks Tom for the input,
Tom
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14 Jan 2025 02:32 #318921 by Cant do this anymore bye all
Replied by Cant do this anymore bye all on topic RPi 5 with 6.12 PREEMPT_RT = Using POSIX non-realtime

Hello @cornholio,

You are right - I need to move on to LinuxCNC. I noticed a new CNC machine. It's called "Maslow". Google it as "Maslow CNC".

I want to use it for cutting out frame members for wooden boats.

Does LinuxCNC support it or does something need to be done?

T
 

From reading their blurb it seems to use a GRBL type controller, not compatible with Linuxcnc's model. Just for future reference anything that connects via USB (as of this current time) or uses a GRBL type controller is not compatible with Linuxcnc.

I always thought kinematics related to the motion of a machine, very math intensive, I wasn't aware speed would negate it.

I have concerns with the machine, the main one being what stops the cutter platform from raising if it hits a knot or other harder section of plywood. I really didn't read too much about it. It may be a reasonable design but not something I'd spend any money on.

A Lowrider would be another option. docs.v1e.com/lowrider/
Tho with the amount of plastic involved meh.

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14 Jan 2025 12:58 - 14 Jan 2025 13:07 #318941 by TomAlborough
Hello @cornholio,

From ChatGPT "what is kinematics":

"Kinematics is a branch of physics that focuses on describing the motion of objects without considering the forces or interactions that cause the motion. It is concerned with analyzing the position, velocity, and acceleration of objects as functions of time."

From ChatGPT "maslow cnc website": www.maslowcnc.com/ Thought I saw some videos online of Maslow showing it flying around but that's just time-lapse. It's a plain vanilla DeWalt router that's creeping around. Very low motion - no need to worry about it (I believe).

"Cutter raising up because of a knot" - good point. This isn't quite child's play.

GRBL - OK. So, a non-starter. Now what do I do?

You reminded me there are Maslow forum(s) so let me go to them.

LowRider - Wow - in several dimensions! Print your own machine.

Tom
Last edit: 14 Jan 2025 13:07 by TomAlborough.

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14 Jan 2025 13:57 #318944 by Cant do this anymore bye all
Replied by Cant do this anymore bye all on topic RPi 5 with 6.12 PREEMPT_RT = Using POSIX non-realtime
So....

BTW Maslow goes at about 1 inch per second so there are no kinematics.


After reading a couple of descriptions of kinematics being a layman I would take it that it would be impossible (someone is bound to cite an example to the opposite) to remove kinematics from the cnc environment.

I have expressed my disdain for ChatGPT ? How it tries to push society towards a certain dogma and exposes the developers leanings ? It's a form of brainwashing, a product by the sheeple for the sheeple. Today's "rebels" towing & pushing the ideology of those that would want to subdue and have total control. The whole coof debarkle was a test run.

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14 Jan 2025 14:00 - 14 Jan 2025 14:22 #318945 by Cant do this anymore bye all
Replied by Cant do this anymore bye all on topic RPi 5 with 6.12 PREEMPT_RT = Using POSIX non-realtime
Tho I would never take away anyone's freedom to use & quote ChatGPT. People can chose what they want to use.

To tell the truth I have nothing against grbl, it has it's place, makes entry to cnc easier for the majority. I have a little desktop router thingy that originally came with a grbl controller, tho it's a good test bed for testing my 7c81 clone. I've had no inclination to convert my laser cutter\engraver to Linuxcnc. Same goes with my 3D printer, Marlin does the job, tho I did upgrade the controller board for the "silent" steppers and turning fans off when not in use. Octoprint is kinda handy as well. Saves walking 6 feet to change sd cards over. ;)

TBH I could have run my mill & lathe with grbl, but I would have lacked such great features such a screw cutting on the lathe, feed by mm per rpm. Tho it has advanced somewhat but haven't really looked at it for years. Tho with the lathe I'm still figuring out with cnc will suit my work flow......tho save my the best part of AUD $600-700 getting a new leadscrew.....Gotta love the Myford price gouging hahahaha. Considering I built the lathe from parts, the only part that had all the bits needed was the head stock, bed, clutch, saddle, cross slide and the rest were all bought bit by bit. Saved buying a rusty worn out of piece of crap and having to replace all the bits anyways.

I wouldn't rule grbl out if it does the job. Look if you can build a boat by cutting sections by hand, stitching with wire and then covering it in 'glass & epoxy, I reckon grbl would be fine.
Last edit: 14 Jan 2025 14:22 by Cant do this anymore bye all.
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14 Jan 2025 17:56 #318968 by TomAlborough
Hello @cornholio:

I hear you. "AI" is a tool. One can try it out as is their desire, but that's getting harder to do given that it seems it's being forced down our throats sometimes. But, that's a problem not solved in this one post.

So, does the gyroscope created by the rotor in the router "cause issues" because the earth is rotating and orbiting about, and by the fact we have gravity or, am I mistaken? Either way I have never investigated gyroscopes beyond crashing some (model) helicopters. They seem to cause confusion (maybe just for me), but after a while that's not an excuse not to learn about them.

I also need to read and understand "background" material I may post, like the citation about "kinematics".

Many thanks,
Tom

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