For drilling anything over 3/16" thick I like to use oil to cool the drill bits. I had been using a cutting oil for years without any problem, but my new powder coater is complaining about it causing bubbles in the finish. They suggested using motor oil or hydraulic fluid instead.
What do my fellow fabricators here find effective? I am trying sae 30 oil but any residuals of it burning off from the weld seems to be irritating my throat. I wipe off any excess oil, but still it gets smokey.
At my work we use boelube we use it on drill bits, power taps, end mills, and even cutting tools on the large manual lathe
[COLOR="Red"][/COLOR][SIZE="5"][/SIZE]88 YJ- 4.7l stroker, AW4, SOA, 8.8, hp D30 powertrax no slip,3" front stretch with waggy springs, stock replacement springs in the rear, 35/12.5 r15 goodyear kevlars
I've been using a Semi-Synthetic Lube from Northern. I think it's called Mystic or Mistic. It's kind of pricey at $65 per gallon but it goes a long way. One gallon usually lasts me 6-8 months (drilling/milling/cutting/lathe). You mix it 1:10 with water. Good stuff.
'80 CJ5 w/AMC360, T176, D44 w/Detroit 4.56, RE 4" YJ lift and 35s..
Maybe i should try one of these products you guys are using.
I've been using 75w-140 syn gear oil only because it was the first thing I found with a small spout on it, and I've been using the same quart bottle for a long time. I hate the smell and how much it smokes.
as far as drilling goes ive been using pag oil that you would put in a/c systems. I always seem to have it in excess laying around the shop from where some a/c kits come with a bottle and only require 2 oz or so.
I've been using whatever left over ATF or engine oil I have in the shop, and its worked well for me so far drilling up to 3/8" plate. Most of the bits I am using are under 3/4', and I haven't run into any problems. I'm sure some of the other oils mentioned may be better, but I've yet to find a reason to spend money on cutting fluids for my needs.
we use Tap Magic, and so long as we clean the area afterward with solvent as we do all parts before paint/powder we have never had an issue.
but everything gets cleaned with tri-free brake cleaner before welding or painting.
Tap Magic x 2....just started using it a while back after it was recommended by a friend that does a fair bit of milling/lathe work. Doesn't smoke real quick and easy clean up. I use it from a squirt bottle made for light oils. I buy it locally at Fastenal. They are cheaper than my other outlets believe it or not.