[difalkner]

Nice, Travis. Why so slow cutting, though? I know you're just cutting air and testing but you'll be cutting faster than that, right?

 

[Rincewind]

Hey buddy, what's the "rumble" type noise at 1:28 onwards till about 1:40 ?

 

[travis.farmer]

Nice, Travis. Why so slow cutting, though? I know you're just cutting air and testing but you'll be cutting faster than that, right?

i have the free, non-commercial version of Fusion360, so it limits the feed rates, sadly. when i have the money, i intend to get VcarvePro, and that should be faster.

Hey buddy, what's the "rumble" type noise at 1:28 onwards till about 1:40 ?

i think what you are hearing is resonance through the machine from the steppers, perhaps. really a lot of different noises going on, too. like the spindle turning, spindle fan, VFD fan, computer fan, furnace. i am fortunate the air-compressor didn't start and jump the heck out of me.

i notice the resonance most when running rapid down the long Y-axis.

another possibility is that the lubrication on the ball-screws is still cold, and hard. i use grease on the ball-screws, as that is what i was told to use years ago. it is an extreme pressure grease, from Mobile1.

 

[MadMark]

Dig into the gcode files and look for F (feed rate commands) Its nominally mm/S or IPS.

 

[difalkner]

Unless the file is huge you might be able to do a find/replace command in your text editor to bump the rapids rate up a bit.

 

[travis.farmer]

it occurred to me, the cuts programmed will be full-through 3/4" plywood, one pass. for my first cuts, i may leave the feed-rate slow to start, but increase the feed-override a bit when i see it is making the cuts without breaking the bit. the spindle power and machine power should hold well, but i don't know about the 1/8" solid-carbide bit...
if i can find a scrap of plywood, i hope to run through with material being cut tomorrow... i hope...

future runs with Fusion360 CAD, i will try to find how to do step-down cuts.

 

[difalkner]

but i don't know about the 1/8" solid-carbide bit

I have my doubts that a 1/8" bit will cut through 3/4" ply in one pass. Also, if you go too slow you won't be making chips, you'll be making dust and likely charred dust, at that.

 

[travis.farmer]

I have my doubts that a 1/8" bit will cut through 3/4" ply in one pass.

the hole cuts need to be a 1/8", as a 1/4" is too big. but i can change the perimeter cut to a 1/4" end-mill, though i will have to change a few things in Fusion360. while i am there, i will look for a way to step the cut down.

 

[difalkner]

The CAM setup is context sensitive and changes with the cut profile. Here are two different profiles and the step-down settings I used on a couple of jobs.

 

[travis.farmer]

First time cutting wood with my new spindle!

it cut just fine, though i could have had more bit sticking out of the collet. just enough, but barely.
i sized the holes it was drilling too exact to size, so i will have to drill them bigger. also, when i first touched off the bit to the workpiece, when i went to cut, it was way above the material. i re-touched off to the spoilboard, and it cut just fine. i think it was because my origin in Fusion360 was under the material, rather than on top of it... not sure how to fix that.

 

[difalkner]

not sure how to fix that.

Right click on your setup and choose Edit. From there you should see 9 circles (there are actually 27 but I typically set Z zero in the center of the work piece). Choose where you want to set your Z zero. The Edit opens to the Setup tab but you may have to click on Stock and back to Setup to see the 9 circles. I always use the nomenclature of zt for Z zero on top and zs for Z zero on the spoilboard. My file names also include that so I can see at a glance where to set Z zero when I load the job. No mistakes this way.

Here's one I did with Z zero on the spoilboard -

And this one has Z zero on top of the work piece -