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Type: Posts; User: gregormarwick

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  1. Replies
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    If I follow your explanation correctly ("above"...

    If I follow your explanation correctly ("above" and "down" do not really compute in the context of Z on a lathe), you are trying to cut a face groove with the tool positioned axial to the part.

    To...
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    Main problem with carbide was rapid flank wear....

    Main problem with carbide was rapid flank wear. CBN might not be always necessary, but it just makes the job go smoothly.
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    I haven't done a huge amount of powder metal...

    I haven't done a huge amount of powder metal turning, but I have done some.

    My experience with it has been that the hardness is only a part of the equation, while abrasiveness is a huge factor.
    ...
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    Sandvik make CBN threading inserts for hard...

    Sandvik make CBN threading inserts for hard threading, they work well as long you don't overload the point.

    266RG-16VM01A001EE 7015
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    Assuming you want to know what the object in your...

    Assuming you want to know what the object in your photos is, it's a Bristol Erickson Speed Indexer, looks like a smaller one. The line was taken over by a company called PTG when BE went defunct,...
  6. I'm going to make a guess that that is a Sandvik...

    I'm going to make a guess that that is a Sandvik insert, not an Iscar one as you previously stated. Iscar don't have a grade 4315 as far as I'm aware.

    If so, then that is a steel geometry insert...
  7. Metric thread tolerances are specified as a...

    Metric thread tolerances are specified as a "grade" and a "position", not a class - btw, not relevant but FYI - class 3 for UN threads is tight, not loose.

    You can read all about it here.
    ...
  8. That's only the geometry. Grade is also...

    That's only the geometry. Grade is also important. Of all the grades that insert is available in, some would be a reasonable choice, but some others definitely not.

    Every time I have experienced...
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    If it's broken off cleanly it will fall out if...

    If it's broken off cleanly it will fall out if you heat it upside down.

    If it doesn't come out freely then it's probably scarred up the bore of the holder where it broke, in which case the holder...
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    Thread is from 2012...

    Thread is from 2012...
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    Uncertainty of measurement is a field all of it's...

    Uncertainty of measurement is a field all of it's own. The 10-1 rule is absolutely just a rule of thumb, employed when you don't want or need to, don't know how to, or are otherwise unable to...
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    That's a Yaskawa part, not Yasnac. Search...

    That's a Yaskawa part, not Yasnac.

    Search accordingly and you should find some options. Does look like a less common one though. I found a couple on ebay that are, as expected, very expensive....
  13. Not just the Yanks. Russia FUD is strong here in...

    Not just the Yanks. Russia FUD is strong here in the UK too, at least amongst the older generations (Boomer/Boomer II). I notice this especially with my (English) mum - she is incapable of holding a...
  14. Sandvik have published data on the relative...

    Sandvik have published data on the relative stiffness of the various spindle interfaces. The objective obviously was the tout the advantages of capto, but the general trend was steep taper > dual...
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    The one I did was just a basic cnc centre lathe...

    The one I did was just a basic cnc centre lathe (Harrison M400 CNC), typical dovetail and gib cross slide but all ballscrew driven. The x axis oscillation was fast but the reversals were relatively...
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    This is not unlike the lathe retro I did with...

    This is not unlike the lathe retro I did with LinuxCNC years ago.

    I used synchronised spindle and x axis with constant z feed to "turn" pins with an asymmetric ellipsis cross section.

    LinuxCNC...
  17. I can think of a few reasons. Speculatively,...

    I can think of a few reasons.

    Speculatively, they may have been refused a license, or it may be that they didn't like the licence costs. It's plausible that BK would prefer not to be associated...
  18. Stainless specific inserts like you are using are...

    Stainless specific inserts like you are using are really intended for austenitic stainlesses like 300 series.

    17-4 in particular (and martensitic stainlesses generally) cut much more like alloy...
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    It's still there: OT:- GBC to remain as a...

    It's still there: OT:- GBC to remain as a moderator?
  20. Colchester and Harrison lathes of that vintage...

    Colchester and Harrison lathes of that vintage are most likely Czech Republic origin.

    Edit: FWIW, Colchester lathes are pretty crap, not really designed for longevity and accordingly most used...
  21. The awful paintjobs might be a British thing,...

    The awful paintjobs might be a British thing, idk. Fairly common to see though, no prep work done, no filling, no masking, just slapped on a quarter of an inch think over everything. I hate seeing...
  22. Seems like lots of people, be they private...

    Seems like lots of people, be they private sellers or dealers, think that roughly slapping a coat of paint over every non-shiny surface of a machine will somehow increase it's value.

    I buy used...
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    Maybe if they delete me I will be infuriated...

    Maybe if they delete me I will be infuriated enough to do that. But for now, happy to take your word for it.
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    Poll: This I agree with, although I don't think Leigh...

    This I agree with, although I don't think Leigh ever stretched to deleting a member.
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    Of course, but until someone in a position to do...

    Of course, but until someone in a position to do so chooses to tell us something, all we can do is make noise.



    Most such systems have either user levels with fixed permissions, or per user...
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