Tips about Feed Speed

[Xardas]

Hello my name is Michael, I work for firm that owns a CNC Routermax ATC 1325 made by Winter Holztechnik. I am not qualified but I tried to learn from ArtCAM how to use it but I don\t think I am using it proper or at it's maximum potential, so I decided to join this forum hopping to learn from the best ...

I used the CNC many times to make engrave in MDF material or to create models out of door blanks witch ar made out of MDF to, my problem is that I don't think the speeds and feeds in ArtCAM are good, almost everytime the chipload is powder like and very hot, i tried using feed speed calculator sites but i dont know what chipload a MDF material should have or what spindle speed should i use. Yesterday i had a incident while cutting in a chipboard of 14mm thickness with a 7mm end mill with double spiral flutes when suddenly the bit slipped out the collet enough to pierce the sacrificial table of 12mm and the CNC aluminum table with 2mm just scapping it, i stoped the program, the bit was hot as hell, and today after i tighened the hell out of that collet holding the bit, i cut a 3mm thick mdf and it shattered. I must ad that the bit was made for a manual router not an automatic one, but i used it several times without any problems except the heat, the program specs were:
Stepover 2.450 mm
Stepdown 1.000 mm
Spindle Speed 15000 r.p.m
Feed Rate 65.000 mm/sec
Plunge Rate 40.000 mm/sec
I really wish that someboy could guide me or tell me a good formula to calculate the feeds or speeds depending on the tool, ball noose, end mill, v-bit, etc... I calculated it out of internet formulas but some of the speeds and feed are to high and i am really afraid of breaking the bits.
Thank you in advance of taking the time to help me with my current predicament...

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[erd39030]

I have ZERO experience with routers and wood machining.
Your cutter is carbide, right?

Your parameters would be fine for machining alumininum with flood coolant.

My guess is that the spindle speed is too high (are you sure its rotating in the right direction?), so the heat is dulling your cutter and a dull cutter generates more heat.

You are around 1000 SFM and 0.004in chipload,
according to this table you should be between 60 and 850 SFM:
http://www.onsrud.com/files/pdf/2012...ools%20MDF.pdf

Good luck:
Everardo

[cdxanti]

http://www.sandvik.coromant.com/en-u...s/default.aspx

Here's the speeds and feeds formulas in metric.
Your going to want the cutting speed, spindle speed, and the table speed or feed formulas.
If you are using a brand named tool the manufacturer will generally make a chart with meters/min for the material. Which you would be using the aluminum materials category. The chart erd has supplied will also work you just need to convert to metric.
Rough numbers, assuming I did my conversions to metric right
M/min=138 ~600SFM
.05mm per flute ~.002in per flute

With those two bits you just need to plug them into the formulas to get your feed and spindle speed.