Milling larg deep holes

1

Hi all,
My name is Roger I’m from USA Georgia.
We recently bought a new HAAS TM2-P and I’m new to cnc sort of I’m used to running wire edm.
however I have a customer that needs a 3" dia. hole 5" deep in mild steel and it needs to be done as quick as possible. Any ideas?

2

Hello, @RogerHooker
My recommendation is drill the biggest hole you can. That’s the fastest way to remove material drill it as deep as you can. Then take a standard length end mill and use a spiral tool path at full depth of cut. Then proceed with a longer End Mill use the same process let’s say it is a 3/4 mill 3" long use 3/4" depth of cut and.025 side cut. Then fnish It with the long tool.Thay make some really nice reduced Shank tools with that kind of reach the to fnish up with. If you do not have a reduced shank tool as you proceed down the whole with each step make the hole slightly smaller. When you take your finished passes you can use what tolerance you have. Top of the whole being at the top of the tolerance in the bottom of the hole being at the bottom of the tolerance. Not sure if it’s a through hole.
I hope this helps, a lot of it depends on the rigidity of your setup and machine.

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3

Thanks!
That’s what I was thinking. unfortunately we’re just getting started in this field and don’t have a lot of tooling. Looks like you have some inhouse produced reduced shank end mills. We are still in the process of buying our tool for the new machine, can you recommend some tools for this particular job?
Thanks again,
Roger

1 Like
4

I use MSC a lot for my tools here is a link to some tools they have And a screen shot.
You can shop the site some times you can find good deals. If you sine up for the emails you will get discounts also if you place a order you can call and ask for a better price.
I hope the best for you on this new machine and project.
https://www.mscdirect.com/product/details/53416020

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5

Thanks for the tips!
I appreciate it.

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6

Roger

If you have a distributor you are using, try Mastercut endmills. We have done a lot of testing with a repeat job over the years and they do a great job vs the name brands. They are $43 vs $70 in a 5 flute endmill for example. Made in the USA in Florida. Another good source for good fairly priced tooling is Maritool.

1 Like
7

Thanks Michael!

We will check them out.