Coarse tooth roughing end mill vs. Fine tooth

[Pcmaker]

I'm buying a 1" roughing end mill from Amazon for my PM-835S. They have 2 options. One is fine tooth and one is coarse tooth. The coarse costs $10 more than the fine tooth one.

Everything else appears to be the same.

What's the difference between the two?

https://www.amazon.com/AccusizeTools-Roughing-Cutting-Over-all-length-1102-0001/dp/B00RY55M70

vs

https://www.amazon.com/Accusize-Coated-M42-8-Cobalt-Roughing/dp/B00RY55JP0

 

[FOMOGO]

I'm thinking finish would be somewhat better with more cutting edges, but material removal rate would be less. Mike

 

[NC Rick]

I have one carbide fine pitched roughing endmill and I love it since it leaves a good enough finish that I can often use it as is.

 

[Pcmaker]

Found a good deal on Amazon. Niagara was having this on sale for $37. I managed to buy one last minute, now it's back up to $82

Niagara Cutter N85650 Carbide Square Nose End Mill, Double End, Weldon Shank, TiAlN Finish, Roughing and Finishing Cut, 30 Degree Helix, 4 Flutes, 4" OAL, 0.500" Cut Diameter, 0.500" Shank Diameter: Amazon.com: Industrial & Scientific

Niagara Cutter N85650 Carbide Square Nose End Mill, Double End, Weldon Shank, TiAlN Finish, Roughing and Finishing Cut, 30 Degree Helix, 4 Flutes, 4" OAL, 0.500" Cut Diameter, 0.500" Shank Diameter: Amazon.com: Industrial & Scientific

www.amazon.com

 

[JimDawson]

Your machine is too small to run a 1'' rougher. We don't even use that large on our Haas, 5/8'' max, and it is a 5500 lb, 7.5HP spindle machine. On my 3500 lb, 3HP spindle machine the largest endmill I normally use is 1/2'', and mostly 3/8''.

The only time I use larger endmills is when I need to cut very deep (>1.5''), then I may use larger endmills to keep the flex to a minimum.

 

[ttabbal]

I have and use 3/4" on a Bridgeport. I probably can't use it to it's full potential, but it's working well when I want to rough parts. I switch to smaller finishing endmills for the last 0.050 or so. Sounds like he ended up getting a 1/2", which should work well for his machine.

 

[aliva]

I bought the same end mill from Accuzize it's a fine tooth. I have a 3 hp BP clone. I have yet to use it . I normally use from 1/4 to 1/2".

 

[Pcmaker]

I've been getting mixed signals on here on what size endmills I should be using.

 

[Janderso]

PCmaker,
Once you get to know your new mill you will be the judge of what works for you.
We all have different experiences, some much more, some much less.
I don’t share your confidence in buying tooling on Amazon.
I just don’t trust the representation of the product being offered.
I hope it works out for you. Watching your threads over the last year or so, you have learned a ton!

 

[JimDawson]

Just to put everything in perspective, here is a block of steel, a 3/8 end mill, and a 50HP spindle. Gives you an idea what modern tooling will take.