implmex
Diamond
- Joined
- Jun 23, 2002
- Location
- Vancouver BC Canada
Good morning All:
I have a project I've been working on and some of the parts are 17-4 PH.
Attached is a picture of two of the parts, and I have quite a few more to make.
They will eventually be heat treated to condition H900...the stock is currently solution annealed (condition A).
The problem is with the tapped holes; they are M1.6 x 0.35 and they were put in with a cut tap.
They were the Devil's very own to tap...3 mm deep full threads because a shoulder bolt threads into these and is located by the recessed pocket you see.
So all has to be concentric (as good as I can realistically make it).
Since I'm gonna need to make these in respectable quantities (dozens) I need to find a better way that doesn't clinch my sphincter quite so hard as these ones did.
The cut taps (I tried two different brands...no name from McMaster and Taylor taps) did not run in easily...I had to squeak them in an eighth of a turn at a time and it took forever as you can imagine.
I helical milled the bores first (after pre-drilling them) so I'm down to 65% of thread already which is my lower acceptable limit.
So all you production threading gurus...what say ye?
How many will I have to trash to dial in the process?
Can I realistically threadmill that deep? Can I do it on a 20 year old beater Haas Minimill with a 6 K spindle?
Should I try to get forming taps?
Should I get better cut taps like Natchis or Guhrings?
Is this amount of pain just what I need to live with tapping condition A 17-4 PH?
Thanks in advance.
Cheers
Marcus
Implant Mechanix • Design & Innovation > HOME
Vancouver Wire EDM -- Wire EDM Machining
I have a project I've been working on and some of the parts are 17-4 PH.
Attached is a picture of two of the parts, and I have quite a few more to make.
They will eventually be heat treated to condition H900...the stock is currently solution annealed (condition A).
The problem is with the tapped holes; they are M1.6 x 0.35 and they were put in with a cut tap.
They were the Devil's very own to tap...3 mm deep full threads because a shoulder bolt threads into these and is located by the recessed pocket you see.
So all has to be concentric (as good as I can realistically make it).
Since I'm gonna need to make these in respectable quantities (dozens) I need to find a better way that doesn't clinch my sphincter quite so hard as these ones did.
The cut taps (I tried two different brands...no name from McMaster and Taylor taps) did not run in easily...I had to squeak them in an eighth of a turn at a time and it took forever as you can imagine.
I helical milled the bores first (after pre-drilling them) so I'm down to 65% of thread already which is my lower acceptable limit.
So all you production threading gurus...what say ye?
How many will I have to trash to dial in the process?
Can I realistically threadmill that deep? Can I do it on a 20 year old beater Haas Minimill with a 6 K spindle?
Should I try to get forming taps?
Should I get better cut taps like Natchis or Guhrings?
Is this amount of pain just what I need to live with tapping condition A 17-4 PH?
Thanks in advance.
Cheers
Marcus
Implant Mechanix • Design & Innovation > HOME
Vancouver Wire EDM -- Wire EDM Machining