endmills breaking, and feedrate

[Teh Bear without Brains kinda idiot]

I will look tomorrow

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Early to bed and early to rise

Makes a man healthy ,wealthy and wise

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[Gary]

If you don't have kero use wd-40. I use it on a daily basis and it works great. plus one on the air also. Works great for tapping also.

[Gary]

I just looked at your file and everthing is real conservative. I would go max rpm .06 dp with about .0015-.002 per tooth feed rate. If you change your feed plane closer .07 and your retract to a higher feed you'll gain alot of cycle time. I would use entry helix with a .07 z clearance. If you use kerosene or wd-40 you'll be safe. I would put it up on the ftp but i only have demo disk at home. Also constant overlap spiral might help because you can keep tool kline cutting. hth

[Teh Bear without Brains kinda idiot]

Looked over your part .

I would take the z0 cut ,make cd drills .droll your holes ,close your holes with surfaces and make surface rough pockest with a big rougher like 16-20 mm .because you do not have water I would go s800 f150 depth of cut 1015 mm with kerosine ,after that would run surface rough ->remachining with roughers 12 mm and 6 mm

I would mill a part a bit deeper ,finish it with end mills and take off second side with alluminium softjaws ,which I would mill according to the part

All the data in metric

HTH

WTHH

[Teh Bear without Brains kinda idiot]

I would use only HSS tools ...

[Jeremy Grigsby Excelsior Marking]

I run 3/16 2 flute 45 degree helix end mills, at a .100 depth cut and 100 IPM. Been using the same endmill for about 7 months now. Works great. Never wears out. It a niagara A245 TiAln coated Solid carbide. Although we use 15,000 rpm and coolant. These endmills do tend to evacuate the chip well though.

[SmaDoc]

Apparently the Mill we have only has a max RPM of 5000rpm (I'll put a link to the specs on the machine at the bottom) which is what I was running yesturday. Everything was fine, except with using a squirt bottle, and the chips not clearing out as much as I'd like I had to keep using feed hold, and turn the spindle off to clear out the chips. If whoever it was that purchased the mill over 4 years ago would have bought the coolant pump for it, it might not be that big of an issue. I guess all I can do is try different things, although I'm leaning towards finding a coolant pump to use. It would have to be something that can just sit in a tray or something.

Again, Thanks for all the tricks and tips to use, being "new" to using CNC Machines it helps alot!

 

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[Tim Johnson]

Use soapy water if you can. Soap breaks down the surface tension of the water and gives you lubrication. Also use an air hose to remove the chips if one is available.