Inserts fit tight in drill pockets

[Mud]

I dug this NOS 1.875" Ingersoll drill out of the "Stuff". I haven't found the number online, it seems to be obsolete. I have a pack of inserts that are spec'd for the current version and size of this drill. When I put these inserts in this drill they don't fit all the way down in the pockets, there's .015 gap under the insert. Even on the outer 2 sided pocket, it squeezes tight between the screw and the sides of the pocket and leaves a .015 gap under the insert. Screws are as tight as I can get them with a torx screwdriver by hand.

So I put it in an engine lathe and drilled a piece of aluminum to see if it would fail anything. Worked fine AFAICT.
Is this OK to run this way? Do you think there's another insert slightly smaller intended for this tool? Should I just run it and see what happens? I just want it ATM for hogging holes in steel on the engine lathe, but if it's intended to work this way I could use it in a VMC or turning center.

 

[Herding Cats]

I have a bunch of Ingersoll drills and all but one take the same inserts. The odd one seems to take a very similar insert to the others but with a larger screw hole. So I wouldn't put it past them to make different inserts that are very similar.

I would prob give it a try. Being an obsolete tool I wouldn't be heart broken if an insert failed and trashed the tool.

 

[Dualkit]

I would put some dychem on it and screw it back down, see if you can relieve a little of the tool pocket to see if it will seat. Leaving it as is will probably eat inserts.

 

[Spruewell]

Maybe you can put a shim under it. I wouldn’t expect it to live long without a properly seated insert. Especially if you are planning to get much performance out of it.

 

[Doug]

Paging Dr. Bob.......
Has anyone invited him to come over here ?

 

[Dualkit]

Maybe you can put a shim under it. I wouldn’t expect it to live long without a properly seated insert. Especially if you are planning to get much performance out of it.

I don't like that idea as it leaves the cutting edge above center.

 

[Herding Cats]

I don't like that idea as it leaves the cutting edge above center.

You are assuming the drill calls for the same thickness inserts he is using. If it calls for slightly thicker ones then they may not be high.

Old inserted drills can be a royal pain getting the correct inserts, which is reflected by my "run her till she blows captain" attitude

 

[Gordon Heaton]

I don't like that idea as it leaves the cutting edge above center.

They're already high! At least they'd be supported at the base.

 

[Carbidebob]

I'm not much help as I can't find much info and it is not in my catalogs.
Pictures show the insert to be too low already.
Since they are sitting zero draw a line though both on picture 4.
Also the insert edge should always be above the steel pocket wall by about .005/.010.
This is done so that you do chip the insert edge.
Ingersoll sucks and makes up insert numbers. They are a mess. Fun fact is that also they have never made their own inserts.
All this done to lock you in.
I think this drill uses a SHLG-44 but not sure and I have no prints on this insert or the one you are using.

I'd make a shim.
Option two is get a tapered endmill and cut some from the pocket walls but I think this puts you too far below center and may be unhappy on the center insert inside. (sometimes you offset the outside from C/L on purpose)
Mits does this but they put a hole in the end of the drill and a slot. Leaves a little peg that breaks off as you go.

So wish I could be more helpful.
Thanks to Doug you are gonna keep up at night wondering.
Bob

 

[Doug]

Thanks to Doug you are gonna keep up at night wondering.
Bob

My work here is done.....

 

[Mud]

Thanks for that Bob. I spose I'll just put this back in the pile. I have some other Ingersoll drills similar. They should look good at my estate auction with all the other unused and almost unused stuff...

 

[Garwood]

Thanks for that Bob. I spose I'll just put this back in the pile. I have some other Ingersoll drills similar. They should look good at my estate auction with all the other unused and almost unused stuff...

I have lots of that... I know as soon as I throw it out I'll find a box of inserts for it.

I have had some weird successes with mix matching inserts though. I have a hundred or so of these oddball 3/4" square milling inserts with a high positive cutting edge. They work amazing as rough turning tools in old negative rake lathe holders. I even tracked down a Devlieg cartridge to use them. I always figure a job will burn up a few of them, but I've never had any job take out more than 2 corners.