coolant purpose?

[jprobst]

i know this might sound like a silly question but is the purpose of coolant to keep the bit cool or chip removal from the part?right now i'm running a part and my coolant is pointed at the bottom of the bit(drill) but i have my parts lined up one right after each other and there is a lip on the part, so after it drills the first part and goes onto the second the coolant hits the part and deflects . it is still hitting the bit but not directly on it, any forseeable problems with that?

[Chuck Reamer]

Coolant also lubricates the tool as well as keeps temp down and washes away chips. As far as your problem, sometimes it happens and there isnt much you can do unless you have a programable coolant nozzle option.

Unless you are deep drilling or at very high speeds it shouldnt be a huge problem. I it is a large number of parts make the coolant hit it from the front or back, instead of from the side.

Good luck
Chuck Reamer

[Newby2]

Coolant can be as much a hinderance as a help. With high speed steel you need the coolant to lubircate and flush the chips, but with carbide, it is detrimental to the tool due to thermal shock. The chipbreaker design actually uses the chip to carry the heat buildup away from the cutting edge. With a carbide drill, the coolant is used more to blow the chips out of the hole than it is used to cool the tool.
I have one job that I use a .224 solid carbide drill with thru tool coolant running at 3200 RPM @.003 feed rate, 9.6 IPM, no peck, just a bullet drill. The grind on the drill produces chips instead of strings. The coolant entrance is lagging the cutting edge instead of leading it. The following cutting edge (2 flute) is actually cutting with no coolant as it is already forming its own chip,blocking the coolant flow to its cutting edge, therefore , no thermal shock.
The failure of HSS is due to the cutting edge not receiving any coolant at the actual cutting point (edge) because the string produced blocks the coolant, hence, heat buildup, and failure.
I am all for solid carbide
Steve

[Chuck Reamer]

When using the proper feeds and speeds with carbide I think its supposed to something like.

%80 of heat goes to chip
%10 to tool
%10 to work

[jackson]

On your haas you should have a port out of the spindal that you can add lock line to and make it were there is 2,3, even 4 nozzels spraying coolnt and i do recomend coolnt for drilling but i use it for about every thing exept turning 304 and milling with TiAIN end mills on stainless they just seem to work better dry

[tobyaxis]

Originally Posted by Newby2 I am all for solid carbide Steve

Your not the only one LOL.
http://www.secotools.com/template/start.asp?id=2181

With the proper Feeds and Speeds per application these last a very long time. Some with Coolant, some without Coolant.

[jackson]

Originally Posted by tobyaxis Your not the only one LOL. http://www.secotools.com/template/start.asp?id=2181 With the proper Feeds and Speeds per application these last a very long time. Some with Coolant, some without Coolant.

is seco the main brand you use i have been doing some looking and have not checked them out

[tobyaxis]

Originally Posted by jackson is seco the main brand you use i have been doing some looking and have not checked them out

That is what most companies that have an "IDEA" use, LOL. Others use regular HSS or Cobalt. Carbide drills last longer, Cut Faster, and Produce more Holes per Drill. That could be a reason why the cost so much, LOL. Worth every Penny in my book.

SGS tools are great too!!
http://www.sgstool.com/

[jackson]

Originally Posted by tobyaxis That is what most companies that have an "IDEA" use, LOL. Others use regular HSS or Cobalt. Carbide drills last longer, Cut Faster, and Produce more Holes per Drill. That could be a reason why the cost so much, LOL. Worth every Penny in my book. SGS tools are great too!! http://www.sgstool.com/

Well i use mostly all carbide and i use all different brand but i have not tried theres i can tell you i dont like there inserts, I alot of Hertel endmills carbide and HSS with tin and TiAIN coting and have great succses with them and there pretty cheap

[tobyaxis]

Originally Posted by jackson Well i use mostly all carbide and i use all different brand but i have not tried theres i can tell you i dont like there inserts, I alot of Hertel endmills carbide and HSS with tin and TiAIN coting and have great succses with them and there pretty cheap

I only use the Seco FF1 Series Inserts for Turning. These are Cermet (Carbide/Ceramic). I have no problems with their Solid Carbide Drills though.

The TP2000 Grades seem to hold up well in CR Steels too.

[jackson]

Originally Posted by tobyaxis I only use the Seco FF1 Series Inserts for Turning. These are Cermet (Carbide/Ceramic). I have no problems with their Solid Carbide Drills though. The TP2000 Grades seem to hold up well in CR Steels too.

Have you tried Sumitomo inserts as of rignt now they are the only ones i use,
and i found a drill the other day that i used instead of a carbide "yeah i had to slow it down" just a little and it has doubled the carbide and it is a Nachi

[tobyaxis]

Originally Posted by jackson Have you tried Sumitomo inserts as of rignt now they are the only ones i use, and i found a drill the other day that i used instead of a carbide "yeah i had to slow it down" just a little and it has doubled the carbide and it is a Nachi

Whatcha Cuttin???????

Sumitomo's are good in certain applications as are the other brands. What is your #1 brand of Inserts and Coolant???????