CNC Spindle Speed

For the mpcnc alot of the parts would be difficult to mill… there are some that do that with the lowrider (4x8) because it uses more flat parts.

And I will let you know how it goes, waiting right now on motors. And I have to find time to build the table :slight_smile:

These are the designs I’ve been looking at (along with mpcnc):

https://www.makerfr.com/en/cnc/rs-cnc32/presentation-rs-cnc32/

Would a combination of printed parts and milled plywood/mdf be strong enough (temporarily) to then mill the aluminum? Use the SM to build parts for a version and then use the new cnc to build an improved/final version of itself.
With the Ox it’s basically just the brace/bracket that would need to be milled.

-S

My projects usually go something like this:
Buy $200 delta printer -> spend $400 on parts upgrading it -> result: printer that’s on par with a $300 printer

So the MPCNC build will be something like -> spend $2000 on better parts -> have cnc worth about $1000.

I should just get a tormach 440.

This sounds so familiar :slight_smile:
At least we’re having fun spending the time on it! (and learning along the way)

I usually do pretty well on getting value for my money.
My problem is usually the time penalty - spending so much time researching instead of just buying something ready to go.
-S

I only do cheap, effective upgrades. If you have the money shapeoko is where its at.

@eh9 good write up - and obviously all you say makes perfect sense.

I’ve seen HAAS CNCs up and close and there’s a reason for the serious chunks of metal.

It’s fun now and then to push something further than its supposed to ever go… …but one has to accept it takes a good chunk out of the expected machine life… …and not expect decent results - may be a learning experience though.

To be honest I’m quite surprised the snapmaker could take on the piece of Delrin I gave it in the video ( shared above )

Likely won’t ever push it that hard again.

It has wet my appetite for a more serious machine - wellsee how that goes.

In the meantime - snapmaker is a decent place to make a bunch of mistakes learning feeds speeds and rigidity.

…in fact…it’s hard to find advice for “feeble machines” - carbide 3d is the closest I’ve found.

Try the mpcnc forum, and look for people who use the large format machines (3’x3’) and those that are using conduit… its still a bit more rigid then the SM2 but it is probably alot closer then the metal framed units.

Thanks @Atom I’ll have a look :slight_smile:

Hello Waldo, I just modified the Snapmaker.CPS file to allow setting the Power from 50 to 100 ( Snapmaker 2.0 limits ). Are you interested in testing it?

What did you adjust? Spindlespeed is 12000U/min, isn’t it?

In the original CPS file, no matter what spindle speed you set in fusion 360, the NC file will always output to P100, meaning 12000…In my CPS, you can change the spindle speed in fusion 360 from 6000 to 12000 and it will output the NC file with P50 to P100, according to the speed selected. And also, you can change the spindle speed between sessions if you use the same tool.

Sounds nice, please share your configuration!
Thanks :+1:

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@luabad

After you pull a request in this repository, I will ask our software developer to check it there.

Edwin

snapmaker.cps.zip (4.0 KB)

I’m able to upload now. Thanks @brent113 .

Here it is the new Snapmaker.cps file…if you run into a bug or something, please let me know and I’ll try to fix it.

I will delete the last post to clear the chat.

After few milling trials I’m facing as well the CNC Spindle Speed topic.
Is there somebody that after the last firmware update has the feeling of a lower spindle speed at full power?

I have some examples where cuts are no more clean like before and even the motor “sound” seems different.
Same GCode as before and same kind of wood.

The display shows the spindle speed while running.
The firmware shouldn’t have changed anything as far as that, but I haven’t updated my firmware personally. Found that with SM firmware that unless there’s something specific that the update fixes that’s important to you you’re usually better off not.
Perhaps your bit is getting dull? Different pieces of the same wood can sometimes vary greatly. Also, it makes a big difference if you’re going cross grain vs. with the grain. Has that changed?
-S

@sdj544 thanks for your feedback. You’re right, in the display I can see te actual spinning speed, that is 12.000.
As you suggest I’ll try a different wood and a different bit. To be honest the last engraving I did, the one where the quality is worse than before, was performed on a piece of wood coming from the same bulk. Anyway I’ll give it a try.
What is making me worried is that it seems, on a visual level, that the spindle is behaving in a different way than before. It seems slower. I’ll check!

Thanks!