Milling Feed And Speeds

[SNUNEZ]

I need help I need to know is there a standard for mill feed? please help I am a welder but trying to get into machining

[aametalmaster]

Try here for some answers.
http://web.mit.edu/2.670/www/Tutoria...scription.html
There are also lots of yahoo groups on milling machines most of them are brand specfic but the info is the same...Bob

[ctrhenry]

grab yourself a copy of the machinery handbook. pricey but really handy for this.


you can buy / use some really nice cutters but it all comes down to how rigid/powerful the machine you are using is.

dont buy 60 dollar endmills for practice

[kcstott]

there is no standard. All material require a different feed and speed rate.
don't get the two confused.
Cutting speed is how fast the tool is turning in relation to the work on a mill or how fast the work is turning in relation to the tool on a lathe
Feed rate is how far you move the tool per revolution in thousandths of an inch.
aluminum is 200 Surface feet per minute
Steel = 90 SFPM
Tool Steel i.e. 4130/4140 a2, d2, stainless steel = 50 SFPM

basically you need to remember a 1" end mill in a mill or a 1" bar in a lathe spinning at 360 rpm is equal to 90 surface feet per minute give or take a bit for rounding off the math.
Cut the speed in half if you run 2" or double the speed if you run 1/2"

feed rate is something all together different but basically no more then .005" per rev on a lathe and .030" depth for the inexperienced
or 6 inches per minute feed at .030" depth on a mill.
Find a machinist and ask questions.
Machine tools are very dangerous and I've seen parts thrown across the shop or 2" bar bent 90 degrees in the lathe
BE CAREFUL!!!!

[SignWave]

Bob, Thanks alot, very informative for some basic info.

[JOHN1]

Go over to the "practical Machinist " forum.

John1

[kcstott]

Someone mentioned the machinery handbook, It's good but also near $75 for a new copy. A better book that I had when I was in my Tech school was the Machinist's ready reference about $20 and has 90% of what a machinist needs to know one a daily basis. Feeds, speed, chip load, tap chart, trig tables, Like I said 90% of the day to day stuff is in there. But when I could finally afford a copy of the machinery hand book i got one. It's an indispensable book.
Kerry