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jack3140
10-07-2010, 08:20 PM
would somebody be kind enough to give me a quick explanation of the speeds to use for milling with end mills trying hard to learn making so many mistakes ...................... lol thanks

Black_Moons
10-07-2010, 08:39 PM
Its all about SFM: Surface feet per min. Thats RPM*PI*Diamiter of endmill/12 (the 12 is for inchs to feet)

Generaly you want around 80~100 for HSS verus mild steel, 200 for HSS verus aluminum. Check graphs or manufacturer recommendations for more details/metals/carbide. Generaly carbide is 2x or more faster, depending on the carbide. Harder materials are generaly slower while softer ones are faster. Other things like the material melting on you (plastics) might limit SFM.

Less 'SFM' will greatly IMPROVE tool life. But make sure you lower your 'feed rate' (RPM of handle * distance moved per revolution = IPM) to keep the same 'Chip load' per tooth (RPM * IPM * number of flutes of endmill)

The quoted words are words you want to google to learn about this.
(If any of my math disagrees with what the web or others here say, Go with the web/others, this is just roughly off the top of my head)

Check web/others here for recommendations on chip load per tooth, Depends on endmill diamiter mainly.

miker
10-07-2010, 08:46 PM
Hi whoever you are and where ever you are.:)

Here are a couple of starters.....

http://www.custompartnet.com/calculator/milling-speed-and-feed

http://machine-tools.netfirms.com/17_Calculating%20SpeedFeed_Milling.htm

http://www.davehylands.com/Machinist/Charts/End-Mill-Data-1.gif

I am just learning also and nothing is set in stone.

Size and rigidity of your mill plus the type of material being machined will require you to experiment around the guidelines from the charts and calculators.

I'm sure some of the more knowledgeable members will chime in and get you on the right track.

Rgds

jack3140
10-07-2010, 08:48 PM
thanks for the tips i,ll give it a shot jack

jack3140
10-07-2010, 08:56 PM
Hi whoever you are and where ever you are.:)

Here are a couple of starters.....

http://www.custompartnet.com/calculator/milling-speed-and-feed

http://machine-tools.netfirms.com/17_Calculating%20SpeedFeed_Milling.htm

http://www.davehylands.com/Machinist/Charts/End-Mill-Data-1.gif

I am just learning also and nothing is set in stone.

Size and rigidity of your mill plus the type of material being machined will require you to experiment around the guidelines from the charts and calculators.

I'm sure some of the more knowledgeable members will chime in and get you on the right track.

Rgds
hi my name is jacques i live in montreal canada and i am a retired electrician and i spend my days of leisure trying my hand a making things having fun while i still can lol have a nice day

Tobias-B
10-08-2010, 12:30 AM
Color of chips (when you're in steel) can be really valuable feedback-
usually, if they're darker than 'straw' you're working something too
fast or too hard... as a beginner.

I too have killed my fair share of mills...

t

David Powell
10-08-2010, 09:31 AM
Just a little tip, while you are learning, and probably knocking the smaller end mills about a bit in various ways, buy cheaper, offshore ones. Once you feel you have got " The touch" to be able to get a reasonable job using them go out and buy ' quality' ones ( Niagara brand come immediately to mind).You will then be able to do a really good job without hesitation or worry. Hope this helps your pocket book and your enjoyment of our great hobby. regards David Powell.

jack3140
10-08-2010, 02:54 PM
thanks guys for the info and tips i finally succeeded in making something useful with my lathe and small horizontal mill i made a ball turner cant wait to try it thanks again jack

vpt
10-09-2010, 10:26 AM
I went on ebay and bought lot auctions of end mills and hss lathe bits. Cheap, you get a whole variety, and sometimes you get some good quality ones in the bunch.

I payed something like $15-20 for 5 pounds of HSS lathe bits when I got my lathe. Best investment I made yet! There were even some carbide bits in the bunch that I use for hard metals.

lazlo
10-09-2010, 10:55 AM
Just a little tip, while you are learning, and probably knocking the smaller end mills about a bit in various ways, buy cheaper, offshore ones. Once you feel you have got " The touch" to be able to get a reasonable job using them go out and buy ' quality' ones ( Niagara brand come immediately to mind).

Great advice. Get a set of the cheap 2- and 4- flute Chicom endmills in the pine box. You'll gank most of them learning speeds and feeds (especially depth of cut).

When you're comfortable with the mill, get name-brand endmills -- Niagara, OSG, Putnam, ... which are made from vastly better tool steel.