Thread: New milling motor
http://zero-divide.net/?page=fswizard get used to using this, it also tells you how much power you need.
Thanks, looks like small cutters and solid carbide are the way forwards. HP does not really factor until you get up in the 10mm dia range and a 10mm carbide tool is quite spendy. But at that size machine rigidity would be a serious factor so conservatively I would guess that carbide cutters <5mm dia are the order of the day for aluminium.
Good calculator in that link BTW
You can use the full cutter size range upto 13mm in aluminium but it will affect DOC and Feedrate. I cut lots of aluminium and find 8mm with 3 flutes is nice size that allows good DOC and feed rates. If used with trochiodal toolpaths the removal rate is brilliant and shifts large amount of chips.
My 2 most often used cutters are 8mm 3 flute rougher and 6mm 2 flute spiral flute for finishing. When ever possible I use Trochiodal toolpaths.
I find 3 flutes are best at roughing.? They are Stiffer and more ridged so can cut deeper. Feed rate and MRR is higher. They give a better finish if not roughers because More flutes.
The only thing is they need more attention to chip clearing and chip clearence. So not ideal for Slotting or small pockets and tight corners where tool cuts on two edges. When used with trochoidal tool paths they rock compared to 2 flute and can be run much faster with more DOC.
Last edited by JAZZCNC; 19-02-2016 at 08:49 PM.
Things are simpler on my manual Bridgeport - just throw in a tool, set the speed to the chart and turn the hand wheels at a rate that keeps her happy :) Got a lot to learn - my reason for building a CNC partly.
So i have a g-code file from SheetCam and it was programmed for say a 6mm roughing cut leaving an allowance for finish, do i need to make a second file for the finish cut or do you use the same cutter but just program a final cut for the finish pass??
One job i have in mind has some 3mm holes in it, i would be looking at ramping in with a 2 or 2.5mm tool for them and then do the outside profile with a larger tool maybe - I am lacking knowledge of how you change tool and get back to exactly the right place OR do you use the tool dia offsets in Mach3
As i said, lots to learn;)
Slot cutting is worst case for most because chip clearence is less so people use less flutes to give more clearence. But if the machine is strong enough and cutting parameters are correct then 3 flute will work just fine and give higher MRR. It's generaly only good advise to those that don't know there machines capabiltys.!
Like wise for finishing or cutting with plenty of chip clearence like profiling then multi flute cutters work great provided the machine can handle the higher feed rates. People go wrong by using multiflute cutters is wrong situations or more often much too low feedrate. If run correctly in right places multiflute cutters give a much better finish.
Last edited by JAZZCNC; 19-02-2016 at 09:09 PM.
For what i need to do, SheetCam should be ok, I am very familiar with that as I use it a lot for my CNC plasma table, but that has no tool sizes - just the torch and that never changes size :)
Will be watching some videos though
By rnr107 in forum Routers, Spindles & ControllersReplies: 2Last Post: 23-04-2014, 02:14 PM
By Swarfing in forum Items On eBay UKReplies: 0Last Post: 16-06-2013, 12:33 PM
By Web Goblin in forum Tool & Tooling TechnologyReplies: 4Last Post: 15-12-2012, 10:15 PM
By Scott in forum General DiscussionReplies: 1Last Post: 03-10-2010, 05:42 PM