avancement speeds on wiki

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LineKernel
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avancement speeds on wiki

Post by LineKernel » Thu Oct 04, 2012 8:09 pm

hi ,
Shapeoko is my first try at cnc,
so as a beginner i was thinking it would be great to have a page on the wiki that would give the feeds rates per material ,
and for those who have the basic spindle , the number on what to set the speed

basically the same page than the HelloWorld page , but the columns would be

material - (eventually raw material picture) - microstep setup - feed rates - spindle number - picture of the result (or video)

exemple

walnut - picture - X8Y8Z2 - $4 400 $5 450 - spindle 5 - picture
maple - picture - X8Y8Z2 - $4 300 $5 300 - spindle 4 - picture
acrylic - picture - X8Y8Z2 - $4 500 $5 500 - spindle 1 - picture

(i got no idea of the values , this is just for illustration)
and the whole data would be in a array same than the hello page world

what do you guy think ?

if there is one already , i havn t found it , could somebody write a link ?

AndrewR
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Re: avancement speeds on wiki

Post by AndrewR » Thu Oct 04, 2012 8:23 pm

Here's a good start for the small bits we deal with.

I won't touch my GRBL $ettings once they're set. They are for defining the maximum capable feeds for your machine. I will adjust the speeds/feeds for each toolpath file I build and that will modify the G01 FXXX values for that material. It's pretty easy to do a quick find/replace in the text file or regenerate the tool paths. I believe that as long as they are slower than the GRBL settings, you'll be fine. If they are greater, they should be slowed to the max $ settings.
- Andrew

ShapeOko #0080

LineKernel
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Re: avancement speeds on wiki

Post by LineKernel » Thu Oct 04, 2012 9:56 pm

oups , yes , i absolutely didn t thought about the bits in use

and , yes you are right , about the grbl setup not changing
this is relative to the setups used in pycam ( or whatever you use )

but i guess then it is not easy to do this list depending on the material then , because the feed rate and the spin speed would depend on material and bit in use ,


i was mainly asking because i have a friend that works with wood , and he still don t believe shapeoko will be able to mill wood , he is always stressing about "you will need a high speed on the spindle , quite some torque , and a feed rate really slow " , he is not using cnc , so he don t understand that i can set the feed rate to my needs ...

Improbable Construct
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Re: avancement speeds on wiki

Post by Improbable Construct » Thu Oct 04, 2012 10:12 pm

LineKernel wrote: i was mainly asking because i have a friend that works with wood , and he still don t believe shapeoko will be able to mill wood , he is always stressing about "you will need a high speed on the spindle , quite some torque , and a feed rate really slow " , he is not using cnc , so he don t understand that i can set the feed rate to my needs ...
The thing he may not understand is that with CNC you don't have to cut it all in one pass. Most of the time I use a 1/8" four flute bit with a cutting depth of 1/16". It takes 12 passes to cut through a 3/4" piece of plywood.

I usually start with 800 - 1000 mm/min as a base line for soft plastics and woods.
I use 600 - 800 mm/min for Acrylic
From there I make some test cuts and speed it up or down depending on the results.
Sometimes slower and deeper is better, sometimes faster and shallower is better.
It is a lot of trial and error.
Shapeoko #Classified some of the bolts may be original parts.
Shapeoko 1 # ???? Stainless plates, still in the box.
Shapeoko 2 # 3926 not stock
Shapeoko 3 # 0003
Store:
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LineKernel
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Re: avancement speeds on wiki

Post by LineKernel » Fri Oct 05, 2012 3:11 pm

@ Improbable Construct
thank for the info , it seems a nice place to start

also what are your microstep settings and $4 $5 values in your grbl ?
as AndrewR mentioned , the values you gave (between 600 and 1000 mm/min) are under your grbl feed rates maximums ?

also , i played only with a pen for now , and when i put 600mm/min in pycam , it already seems quite fast
i ll do a test with 1000mm/min to see what it looks like .

i ll also take a look at my grbl maximums to compare

Improbable Construct
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Re: avancement speeds on wiki

Post by Improbable Construct » Fri Oct 05, 2012 3:45 pm

I don't use grbl so I can not help you with that, but there are lots of people here who do so maybe someone can answer those questions.

Here is a really bad video for my shapeoko running the "hello world" file.
I modified the g-code to have a feed speed of 100 Inch/min. That is 2540 mm/min.
I am running it at that speed with a DW660 spindle installed and a pencil tip crammed into the collet.

Shapeoko #Classified some of the bolts may be original parts.
Shapeoko 1 # ???? Stainless plates, still in the box.
Shapeoko 2 # 3926 not stock
Shapeoko 3 # 0003
Store:
http://ImprobableConstruct.com
Twitter:
https://twitter.com/ImprblConstruct

LineKernel
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Re: avancement speeds on wiki

Post by LineKernel » Fri Oct 05, 2012 5:27 pm

waouw , i had no idea it could go this fast
also , people using grbl , might be more limited than you
it ll depend on the number of microstep your driver is setup
at some point , i think it reach the limit of the pulse max speed the arduino can handle .

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