- Thread starter John_aero
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Martin Hocking
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Blimey @John_aero that sounds a bit drastic! But I’d imagine it would solve the problem!
What are you planning on using it for?
In fact what does everyone use them for?
I understand why it might be useful to machine a face nice and square with a bore as well as the myriad of other functions you see on the instructions but I wonder if anyone puts them to use regularly?
What are you planning on using it for?
In fact what does everyone use them for?
I understand why it might be useful to machine a face nice and square with a bore as well as the myriad of other functions you see on the instructions but I wonder if anyone puts them to use regularly?
John_aero
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Well it might simplify buying other tools too. Working on a VW beetle and plan do some engine builds so the auto head would be ideal for doing some head work and bore work
Put your handbag away. You're practically arguing the same point.
It would surely be self evident that an ISO50 taper is stiffer than R8 - they don't make big machines for bragging rights, but if you don't have an ISO50 spindle to stuff it in, you can't possibly leverage the benefits of its stiffness. If you made an adaptor to fit an ISO50 tool in an R8 spindle the extra length would far outweigh the rigidity you'd lose from just machining it back to a parallel 20mm shank.
A 20mm shank can still do plenty of work, as can an R8 tool in a Bridgeport, just significantly less in a single pass than an ISO50 taper, but it will get there eventually.
GaryS65
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You've completely missed the point of the whole post and obviously the kinematics of machine tool tapers.
We are not comparing ISO50 to R8. We are comparing a parallel shank to R8.
Worse than that, the above posts are recommending destroying a perfectly good 30/40 taper Wohlhaupter by putting a straight shank on it.
Thats a waste of a good boring head for something that's never going to perform as good as the proper article.
Find an R8 taper boring/facing head. R8 is the most widely available of all tooling. Maybe not with wohlhaupters but with everything else.
You've got a tool that's 2.5-3" in diameter and only gets bigger as you face outwards or bore bigger diameters.
Then want to put a 20mm straight shank on it.
The deflection will be awful, it won't be dependable if trying to dial half a thou as they are more than capable of.
Without a taper its never going to repeat if you remove it from the spindle.
Heavy or interrupted cuts will encourage it to slip in the collet.
Facing loads the tool upwards, there is no taper to transfer the axial load.
Do the job properly, get the proper tool.
OP don't discount Kuroda, Narex, Mixoguchi or Gamet boring heads. The last one, Gamet, are far more common and reasonably priced.
My apologies. When you said:
"as someone who uses an straight shank, an INT40 and ISO50 wohlhaupter I can tell you right now, it ruins the rigidity."
I assumed you were commenting on rigidity of parallel shank vs ISO50. Also that your frame of reference didn't include R8 nor were you comparing repeatability. I was clearly wide of the mark.
As you were.
GaryS65
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