Drilling holes in CPM steels larger than 1/2"

LCKT707 said:
Thank you for the input! Always good to see you chime in, been loving the 3V Field Knife! It's started a good few fires now and been through lots of wood.



Alright I think i'm sold on the hole saws now lol. Just got the new press installed today, she goes as low as 140 and is rated for 3/4" steel so I think i'll take a stab at this later today when I get my chuck installed. I forsee lots of cutting oil :D
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I have a 17" drill press that goes down to 250 rpm I believe. I drilled a 3" hole with a Milwaukee hole saw in 1.5" steel. I chain drilled the perimeter and just connected the dots in essence. If the belts are tight and you don't over feed, the hole saw capacities for dill presses is quite large since you are only cutting a thin slot around the perimeter vs. drilling out all the material with a conventional drill.
 
Nathan, how come you're not using indexable insert drills? Back in the last place of my employment* we had those up to, I'd guess about 1½"- pretty handy tools, with cooling through the spindle; they usualy saved the day when drilling the 'very gummy' (unknown) stainless steel we had to occasionally deal with (that stuff was inexplicably burning and breaking every other drill bit- HSS or carbide)...

* it was a sort of machine shop run by asylum inmates (OK, they weren't certified, but it's only because nobody bothered to check them) :-p
 
No problem with drilling 10-20mm holes in M390/K390/S390.
But maybe because I use mill/drill with 1,1kW Engine and 180rpm ( I have on this 180-2000rpm range)
ZX7045

Just going slow and lubricating oil for working with problematic materials.
 
140rpm and some patience and we have holes! Thanks again for the help everyone, surprised the ace bit still has teeth LOL. If you're wondering, it's black from a previous bout with some carbon fiber ;)

BZkgPvi.jpg
 
stephanfowler said:
looks dry, did you use cutting oil

(I would highly suggest that you do)
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I wiped it all down for the picture but didn't use much to begin with. I went extremely slow and the heat barely made it past 95F, took a good while but it was miles better than my old method haha. Also, I need more cutting oil... do you use any recycled oils or buy the actual cutting oils?
 
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