Cutting oil for lathe sump system

[carlsbad]

Years ago I bought a partial barrel of cutting oil and have been running it in my sumps ever since. I lost the records on what it is. It has been very good to me.

Now the last batch of it is getting dirty. Any recommendations on affordable oil to put in the sump?

I do not like water based fluids.

--Jerry

 

[Danny1788]

I bought 5gal of high sulfur dark cutting oil from mcmaster Carr and it’s been good stuff so far. It was around $100 shipped to my door

 

[Dave@MAM]

I use two products from H&B Petroleum in Rockaway Nj. I use their gun drill oil in my barrel flush for reaming, leaves a beautiful finish. I use their Habcool 318 tapping fluid for cutting threads. It is a dark sulfur oil it seems. Their stuff is a little pricey but it has served me well and they are good folks to deal with. habcool.com.

 

[R.Morehouse]

www.viperbench-rest.com Bob Pastor has a good product. Give him a call.

Regards
Rick

 

[carlsbad]

Just to be clear, I'm looking for something in gallons to put in the sump.

 

[ridgeway]

Mobilmet 766

 

[Dave@MAM]

H&B Petroleum will sell and ship in gallon, 5 gallon pails or 55 gallon drums, whichever quantity is desired.

 

[carlsbad]

@Daerider

 

[John from MN]

50% Mobilmet 766 and 50% ATF works well for me.

 

[accuracyman]

Mobilmet 766 is all I use. Good stuff.

 

[carlsbad]

50% Mobilmet 766 and 50% ATF works well for me.

I've heard of using ATF in cutting oil. I have 6 quarts of old ATF I need to get rid of. Should I just add it to the sump?

 

[ridgeway]

I use 1 quart ATF to 1 gallon of 766.

 

[carlsbad]

OK. Gonna go put one quart in now. It's about a quart low.

 

[tobnpr]

Any high-sulfur cutting oil (I have a mix of Ridgid and Oatey, only because they didn't have enough Ridgid at the plumbing supply house)- and I cut 20% with ATF as well.

 

[Dusty Stevens]

Its all in how thin you want it. Start with like rigid dark and add atf until it flows like you want. Atf keeps stuff clean too

 

[shortgrass]

Why not just use screw machine oil if you need something 'thinner'? Aerokut 77 or Hangsterfers'. Designed as "cutting oil". About the weight of 20wt, so it flows good. Over the 26+yrs I 've been chambering, dark threading oil has always worked well using a flush system, long before flush systems were popular. The only 'additive' I've added is Tap Magic w/EP extra. All designed as "cutting oils". It never occurred to me to add hydraulic oil, like ATF.