insert drilling 15-5PH @H1025; speeds and feeds?

[mkd]

turning a 1.5" dia part and getting beautiful parts at the moment

all the tools are getting good life except the .750 insert drill.

 

i'm drilling out the center, retracting, offsetting .28" (.14 radially) on dia and rough boring.

 Most of the wear is concentrated on a .14 with of the outer insert, and this pass sequels like someone letting the air out of a balloon. currently running [email protected]".

 I've tried two offset passes (for three total) which didn't really seem to help, so now back to the one offset taking .14"doc.

 

uhhg insert life sux

 

 

[dstryr]

I'd switch to an indexable tip drill and then use a boring bar to rough. Never had good luck trying to use an indexable drill to bore with in anything other than mild steel or aluminum.

[mkd]

thanks for relaying your experience on offset drilling, as i've never attempted this before.

I tried going from .75 to 1.06" with the boring bar, but tool life there suffered also (no coolant fed on bar). And i didn't think I was very brilliant roughing with the finish tool.

 Didn't think it would be this much trouble. Captain obvious says I shoulda opted for the 1" insert drill. Dang it!

[Matthew Hajicek - Singularity]

How deep?  Can you choke up on the boring bar any more?  Stick-out has an exponential effect on rigidity.  IIRC if you double the stick-out you get four times the flex, so every little bit of shortening helps.

[mkd]

part is only 1.3 long/deep with a thru bore.

 

i thought it was coolant related on the offset drill pass, so I stopped short .02" on the center pass to leave a slug. It worked and coolant is shooting back out of the hole for the second pass, but it didn't help insert life any.

 

boring bar is fairly stout, just think it is smart to leave the finish tool only finishing.

 

Unless there is some magic speeds and feeds with the undersized drill, I'm going to need to pony up $$$ and get the drill i should have got in the first place.

 

 anyone need a used .75 insert drill?

[mkd]

 

 

Let's see what damage I can do with this bad boy.

[Mike@Lustre]

that should do it I have used a U drill in the past to drill the hole and open it up to a rough ID prior to running a bar thru it for size .

[mkd]

what's a U drill?

that like a double right angle head, on a mill?

[Matthew Hajicek - Singularity]

 

 

anyone need a used .75 insert drill? 

 

Which part number, and for how much?

[mkd]

Which part number, and for how much?

q0191057nr01* (some cosmetic body rub so not 100%)

7 inserts grade 1030

paid $550

PM an offer

ingersoll rep is coming tomorrow, maybe he'll have some great idea

[mkd]

anyone know how to do a load monitor on an OSP7000 lathe?

[Mike@Lustre]

http://cncmanual.com/okuma/okuma-osp-7000/