Help! > Mistakes, muckups, and dangerous behaviour
Slitting saw and destroying my mill
uuu:
--- Quote from: Jasonb on September 18, 2023, 08:23:54 PM ---Your arbor is also not shaped like the drawing showed. You simply need a cut that goes right through and splits the arbor in half.
A simple hacksaw cut is all that is needed and is a lot less costly
--- End quote ---
Or... how about a thin blade in an angle grinder. I find these surprisingly controllable - OK not the precision available in the mill, but a good alternative to a hacksaw.
Wilf
redhouseluv:
The steel in question was sold as BRIGHT MILD STEEL SQUARE BAR GRADE - EN3B
Does this mean anything in terms of my approach future concerns? Maybe I should buy a particular type of steel?
jadge:
--- Quote from: Jasonb on September 19, 2023, 02:24:36 PM ---...do you apply that 4thou to all the teeth or just the ones making contact each time round...
--- End quote ---
It would depend upon the eccentricity. I've never measured it but work on the assumption that a good quality arbor and slitting saw should be a couple of thou at most. I apply the 4 thou per tooth as an average. If the total run out is 2 thou then the cut per tooth will vary from 3 to 5 thou. So not that much variation; it would be less for higher chip loads. The important thing is that all teeth are cutting albeit at slightly different depths.
If we assume an eccentricity of 2 thou and a chip load of 4 tenths of a thou then quite a few teeth will just be along for the ride. That might explain the need for a very slow feed as only a few teeth are cutting.
Andrew
jadge:
--- Quote from: redhouseluv on September 19, 2023, 07:09:13 PM ---The steel in question was sold as BRIGHT MILD STEEL SQUARE BAR GRADE - EN3B
--- End quote ---
Of the mild steels EN3B is not the easiest on which to obtain a good finish, it's a bit gummy and prone to tearing. But in the original pictures what I assume is a turned finish is awful. Either the material isn't what it purports to be or there is something badly amiss with the technique.
Andrew
Jasonb:
I think we have put that one down to a knackered insert
https://www.modelenginemaker.com/index.php/topic,11579.msg271583.html#msg271583
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