Erm, where's this..?

So, I was looking to download CC for my PC (I already have it installed on my Mac), but I can’t find where this is:

…as I so want to set these speeds automagically!

Thanks

I’m not sure what “this” is but all of that dialog is available on the windows versions. There is no “Set Speeds Automatically” checkbox in the versions I have (4.74 and 5.14), the speeds are automatically set automatically - and then you can override them with an Edit button.

On WINDOWS Version 4.74:
When you start a toolpath you get:


if you Click on “Edit”, you’ll get the opportunity to override the defaults:

On WINDOWS Version 5.14 (Beta)
When you start a toolpath you get


Which is going to do the default thing (automagically), but if you click on “Edit”, you have the opportunity to override all of your speed settings:

Does this answer the question?

4 Likes

The automagic feeds and speeds were removed from Carbide Create in 440 — that and later use a curated set of feeds and speeds which are stored in CSV files.

See https://www.youtube.com/watch?v=S9bceJxpqG0 for concepts on this and see the series #MaterialMonday: #MaterialMonday on YouTube for specifics.

You should test feeds and speeds in a piece of scrap using the technique at: https://precisebits.com/tutorials/calibrating_feeds_n_speeds.htm

Another consideration is Climb vs. Conventional Milling and tooling engagement — where possible avoid slotting and add geometry and cut as a pocket (Adding geometry to cut as a pocket with a finishing pass ) and consider leaving a roughing clearance and taking a finishing pass.

Extensive discussion at: Origin/consistency of chipload recommendations and https://shapeokoenthusiasts.gitbook.io/shapeoko-cnc-a-to-z/feeds-and-speeds-basics with a spreadsheet for this at: Speeds, Feeds, Power, and Force (SFPF) Calculator

I’ve got to be honest here, but this speeds and feeds thing is driving me to distraction.

It’s like trying to work out a complex formula with at least two of the required variables missing and having no clue where to find them!

I’m referred to the manufacturer’s end mill table, but Inventables don’t seem to have one for their bits for me to work out the feed rate, and in the Milling Speed and Feed Calculator (here) I don’t understand enough to get to the IPT!

Back to the manual, I guess!

the nice thing with the new carbide create is that you don’t need to care (at first)… just pick the end mill and material and it picks good but conservative values

only if you later want to optimize for cutting time … then go play with the details

3 Likes

As @fenrus notes, you should start with Carbide 3D (or compatible) tooling and the curated set of feeds and speeds in Carbide Create — then you can adjust/optimize from there, or branch out into unsupported tooling.

The point about solving for an unknown is an excellent analogy. Given:

  • endmill diameter
  • number of flutes

you are trying to solve for

  • feed rate
  • spindle RPM

which will provide a chipload which is suited to cutting the material within the constraints of

  • how fast the machine can reasonably move
  • how much force the machine can exert/withstand for a given cut

I would suggest starting with:

https://shapeokoenthusiasts.gitbook.io/shapeoko-cnc-a-to-z/feeds-and-speeds-basics — if there’s something in that which you find confusing, let us know and we’ll do our best to work through it with you.

2 Likes

I appreciate the guidance and help you’ve been providing here, everyone (@WillAdams, @GJM and @fenrus).

I’ll take a look at the ‘book’ and work my way through that part of it and see how I get on - and I know where to get help, thank you :slight_smile: