Would a 3/4" roughing endmill be too big for my PM-835S?

[Pcmaker]

I need a roughing endmill that can hog out a good amount of chips. I have a PM-835S knee mill. I was wondering if it would be too big for my mill to take deep cuts?

 

[coolidge]

I would think you are fine there, my 2hp R8 mill is rated for up to 1 1/4 inch end mills.

 

[mksj]

It will work well, I used a 7/8" on a 2Hp bench top and 3 Hp knee mill. Also depends on the material and the rougher, they throw a boatload of chips.

 

[ivel03]

I've used a 3/4 endmill in my PM30 machine which is smaller than that so i think it'd be fine. Depends on the material and feeds and speeds.

 

[ChazzC]

I've used 3/4" x 4" CL (side cutting) & 3/4" x 2" CL (end cutting) in 6061:

and 1-1/4" x 2" CL (partial plunge cuts) in 6061:

with my LMS 3990 Mini-Mill (2/3Hp, rated 13mm end milling/30mm face milling) without any issues; was conservative with feed & speed, and consulted LMS first.

 

[mksj]

Rougher Deep slotting and shouldering on 7075 Aluminum using coarse 3/4" and fine 7/8" rougher end mills. Material, speed and feeds along with SFM dictate the depth of cut and amount material that can be removed per pass. I usually will take a first pass manually to determine cutting performance and feed rate and then use a power feed when shouldering. Aluminum I am usually running in the 2500-2800 RPM range, steel 800-1200 RPM but depends on a lot of different factors.

 

[Pcmaker]

I mainly work on mild steel. I use carbide on carbon and stainless steel

 

[coolidge]

Rougher Deep slotting and shouldering on 7075 Aluminum using coarse 3/4" and fine 7/8" rougher end mills. Material, speed and feeds along with SFM dictate the depth of cut and amount material that can be removed per pass. I usually will take a first pass manually to determine cutting performance and feed rate and then use a power feed when shouldering. Aluminum I am usually running in the 2500-2800 RPM range, steel 800-1200 RPM but depends on a lot of different factors.

View attachment 501435

Get some!!

 

[Pcmaker]

Around what RPM should I be starting at? I just ordered one from Amazon

 

[mksj]

Assuming 3/4" HSS coated 6 flute, would start at around 600 RPM at 6-8 IPM, in something like 1018 but also depends on the amount of material you are removing. The maximum diameter depth is no more than 1/2 the diameter of the cutter and also depends on the vertical depth, as the depth increases the lateral depth would decrease. I am usually doing shoulder cutting in steel, 1/2-3/4" vertical depth of cut. The chart below is from Melin, I tend to use higher SFM, in particular in Aluminum and run some air/light coolant.