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    Cyclical Mill Vibration & Power Discussion

    I'm pretty certain it's mechanical & I could probably write a short thesis on what was speculated & evaluated leading up to this. Last week the motor came off & run up independently (perfectly smooth). Head was evaluated piece by piece down to the bottom. Everything looks clean & in great...
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    Tips/Techniques Carbide insert chamfering tool for AXA

    I have a CCMT holder set from way back (OMG the prices have gone insane!). But it uses the insert in different orientations you don't see on many generics. One is a true 45-deg in orientation you show. Another uses the 'rarely used' wide angle point of parallelogram. Mentioning more in case you...
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    PM Models #5 steam engine

    Sorry, I don't know much about these kinds of model engines. I did a search & was kind of surprised there weren't a bunch of active builds on the forums I frequent. Maybe you are familiar already but this channel has what looks to be relatively recent (but early stage) vids in progress...
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    Cyclical Mill Vibration & Power Discussion

    I've been sorting through a kind of a background harmonic resonance issue on my (single phase 220V mill). A few forum buddies have been in the loop. I made some good 'mechanical progress', its certainly much better than it was. One of the things that came up in discussion is apparently some...
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    Identifying an odd thread.

    the left one IMP (although it also does MET) http://theoreticalmachinist.com/Threads_UnifiedImperial.aspx the right one MET https://amesweb.info/Screws/metric-external-thread-dimensions-chart.aspx as I mention in my other post about metric threads, there can still be differences, presumably...
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    Identifying an odd thread.

    Pitch IMP = 20 TPI = 1/20 = 0.0500" Pitch MET = 1.25/25.4 = 0.0492" So 0.00079" pitch difference assuming both are the same thread angle. Can you turn whatever screw you are operating a maximum number of turns & measure physical displacement? Even 10 turns would amount to 0.008" difference...
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    Identifying an odd thread.

    I've used Bondo to make impressions. As long as the surface has a thin film of oil it will release OK. But don't get yourself into unchartered troubles, test it on a bolt or something beforehand. Not the best for threads because you could only get a half diameter impression, but maybe helpful if...
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    Identifying an odd thread.

    And then there's ACME (29-deg) vs Trapezoidal (30-deg)
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    Print in place hinge mechanism

    A tiny crackle & it rotates perfectly free. Well, as smooth as can be expected by printed striations of what are theoretical round parts, axle & hole. I didn't realize till I printed it, has an integrated stop profile so it's 0-180 hinge. My setting is 0.2mm on 0.4 nozzle. I'd take a pic but I'm...
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    Identifying an odd thread.

    Presumably the crank has a dial to confirm physical displacement over N turns assuming its in good shape which should define pitch. Without seeing it up close you are kind of down the path of detective work & educated guessing which might only get you so far. We assume it was made or procured...
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