Deep hole drilling
Deep hole drilling
(OP)
Hello all,
I will soon need to do some deep hole drilling for a job we have on. It involves a hole drilled into 35ncd16 steel (annealed condition), to about 180mm deep, likely a blind hole, but yet to be seen how the job will be chucked up.
We have a Mazak SQT15MS, and the job will be done on this machine one way or other.
Looking to drill a hole from one end, rechuck in auto to second spindle, finish other end of hole as it is a different size and not so important for being central.
Am thinking of using a gundrill, STS or Double tube drill for this???
The hole will be reamed when finish. Finish size is 22.20mm making the hole ratio about 8-9 to 1.
I will soon need to do some deep hole drilling for a job we have on. It involves a hole drilled into 35ncd16 steel (annealed condition), to about 180mm deep, likely a blind hole, but yet to be seen how the job will be chucked up.
We have a Mazak SQT15MS, and the job will be done on this machine one way or other.
Looking to drill a hole from one end, rechuck in auto to second spindle, finish other end of hole as it is a different size and not so important for being central.
Am thinking of using a gundrill, STS or Double tube drill for this???
The hole will be reamed when finish. Finish size is 22.20mm making the hole ratio about 8-9 to 1.





RE: Deep hole drilling
If your quantity and finishing requirements are high I would also look at the Engis one pass system of diamond honing.
http://www.alliedmachine.com/home.cfm
http://www.engis.com/products/honing/tools.php
RE: Deep hole drilling
RE: Deep hole drilling
RE: Deep hole drilling
RE: Deep hole drilling
Specialist 3 & 5 Axis Machining
http://www.midlandalloy.com
RE: Deep hole drilling
RE: Deep hole drilling
RE: Deep hole drilling
Have been keeping an eye on this thread, although not posting. An update of sorts for drilling:
We have now tried a few options, only one so far working: that being a std HSSCo drill. Guhring and other insert drills did not work at all, but I havent tried the allied unit.
We have had so much "expert" advice from tooling suppliers, with NOT ONE of them being correct. This is why we now use the std drill. Going one step further a gun drill may work, and probably make a much nicer hole.
The one issue we have is coolant pressure, which is as low as 10 bar, so all options need to take this into account.
RE: Deep hole drilling
Maybe I should have been a little more specific when I mentioned gun drilling with Guhring tools. We use a single flute gun drill like the Guhring EB 80, not an insert-type drill. Page 24 of this .pdf shows the large diameter, long length gun drills of the single flute variety:
http:
RE: Deep hole drilling
They worked well, with no problems.
RE: Deep hole drilling
Haven't used them, but they have two internal holes running down to the bit cutting faces for lubrication. Sizes are from 7/26 inch through 2"; lengths from 9" up to 17"
RE: Deep hole drilling
Viktor
http://viktorastakhov.tripod.com
RE: Deep hole drilling
RE: Deep hole drilling
Like others have said, this costs far less in tooling and cycle time than gun drilling of any sort, and a mishap won't cost you a $1,200 drilling system.
Surprising was that roundness was .0002; we expected better than that though we did not need it for this application.
We have also been looking into the Allied Gen3Sys drills; however, we don't have any performance data on them yet.
http://ww
RE: Deep hole drilling
The Mapal is not like the Allied unit, as it is a complete head, rather than a spade type flat bit. ALso has 4 x guide pads on the sides of the head to limit sideways movement.
We are using 0,3mm (0.013")/ rev and 800 rpm rotational speed. Penetration is excellent, and of course there is no pilot.
Now we are onto getting a new reamer to go with this drill.
RE: Deep hole drilling
http://www.engis.com/products/honing/
http://www.helicallap.com/