0-80 tapping
0-80 tapping
(OP)
Hi, Iam a start up company and have a job that requires tapping 150 0-80 blind holes,.110 deep in alum. I have been using an .05 dia. end mill to drill the hole to get as much clearance as i can. I am tapping these holes about .015 from the bottom to meet the spec.
I cannot go any deeper with the end mill as i am already about .01 from breaking thru.
Even though my machine is capable of ridgid tapping, i am using a floating holder.
The problem is relability. sometimes i can go thruogh several parts without breaking a tap, sometimes i can't make it through one part.
Can anybody offer anyt tips ?
Thanks
Keith
I cannot go any deeper with the end mill as i am already about .01 from breaking thru.
Even though my machine is capable of ridgid tapping, i am using a floating holder.
The problem is relability. sometimes i can go thruogh several parts without breaking a tap, sometimes i can't make it through one part.
Can anybody offer anyt tips ?
Thanks
Keith





RE: 0-80 tapping
Ken
RE: 0-80 tapping
RE: 0-80 tapping
This is a new job, haven,y run many of them yet. Trying to the solve a problem before I run to many more.
JDana:
1) Alloy: 6061 T651
2) Using a cut tap (bottom tap, ) after talking with the customer about thread depth I am going to try a spirol point bottom tap. And TapMagic
3) Coolant: Valenite VNT 800 (on the rich side)
Chips in holes: ?? , hoping the flood coolant is washing any chips out.
4) Floatating tap holder: More than anything, i am using it to hopefully take out any runout issues.
RE: 0-80 tapping
2)Cut tap- fast spiral good, spiral point not so good, will push chips to bottom of hole. Roll form tap much better for blind holes(needs bigger dia. drill)
3)no experience with this stuff
Flood coolant will wash chips away. Away to where is the issue. We have found that sometimes they end up in other holes, with taps this size it doesn't take much.
RE: 0-80 tapping
I don't mind fishing out the chips if i use a spiral point tap if it keeps the chips from going into another hole and caosing a problem.
I use a lot of spiral flute taps at my day job. But there i deal in the macro world. At home i am tryng to work in the micro world. this is new to me.
The only spiral flute bottom taps i can find cost $40. Do you know of a cheaper sorce?
Thanks
Keith
RE: 0-80 tapping
type in: 04500815 in the quick search field
scroll down to MSC Big Book page and click "233"
you will find several taps under $20.
I personally wouldn't use anything but a roll form tap for blind holes that small.
try searching 74540848 then the Big Book pg to find them.
RE: 0-80 tapping
www.prototyp.com
RE: 0-80 tapping
http://www.morris01550.com/prectap.htm
RE: 0-80 tapping
"OSG Hypro(used to be PXL)" taps outperform others I have tried by a large margin. With reverse spiral flutes the chips will come out of the hole.
RE: 0-80 tapping
RE: 0-80 tapping
Is the name of the pink paste that you are trying to describe CIMTAP??? I have used it on several types of stainless.