The Craftmans Shop > New from Old
Toolset 140 Tool Setter Re-purposed
PekkaNF:
So....how that works?
1: Spindle is used to swing one insert a time into measurement.
2: Display shows X/Y coordinates and indicator is adjusted to zero, to measure tip of the tool insert.
Result is X/Y offset. X ref to dia - I.E. rotational axis of the ISO40? Y from base line height (relative to gauge line)?
But how these references are zeroed? Is there a calibration plug that is known and upon touchdown known values are fed in or reset?
And how that dial mechanism. works? Stylys is mounted on flexure and main detection plane is diagonally to X/Y axis?
Probably very basic questions, but I never dwelled into CNC at personal level.
awemawson:
In it's intended use, the upper surface of the reference plane of the CAT40 socket is Z=0 and it's outer diameter is a known value that the machine uses to know where the centre of rotation is, thus where X=0.
The 'probe' can be manipulated in X & Z by coarse and fine adjustments, and when measuring the built in indicator is monitored to get it's pointer to zero for consistent readings.
In this new usage, with a CAT40 to 40 mm end mill holder I will set an offset Z=0 as the upper surface of the inserted holder upon which will rest the reference surface of the VDI40 lathe tool holder. Thus I can then measure the dimensions of the lathe tool holder which are the offset values that the lathe controller needs.
Obviously the rotational position of the lathe tool holder comes into play when measuring the tool tip distance from the axis of rotation, and I will have initially set it by eye, then rotate the holder on it's precision bearing to get a maximum reading, just as in the original application a face mill (for instance) would need rotating to a maximum for each insert.
All this is to allow me to measure some tools (probably just one tool in fact) in absolute terms, so that when I measure it again on the actual lathe using the Renishaw HPA tool probe I can compare the measurements and adjust the parameters that represent the HPA's X & Z location to give the same measured value.
At the moment the tip of the HPA is suspended in space at an approximately known position, and all tool offset measurement are relative to this fuzzy location. I want to focus the fuzz :lol:
PekkaNF:
Thank you Andrew, good to know that there were no black magic in it.
--- Quote from: awemawson on April 04, 2019, 03:47:42 AM ---...
All this is to allow me to measure some tools (probably just one tool in fact) in absolute terms, so that when I measure it again on the actual lathe using the Renishaw HPA tool probe I can compare the measurements and adjust the parameters that represent the HPA's X & Z location to give the same measured value.
At the moment the tip of the HPA is suspended in space at an approximately known position, and all tool offset measurement are relative to this fuzzy location. I want to focus the fuzz :lol:
--- End quote ---
I get it. You are going to sort of reverse calibrate (or actually set) the tool setter. Does it allow multiple "zeros"? Or just one for ISO40 holders?
awemawson:
The Toolset does allow multiple offsets for zero, but setting them is a bit complicated. I'll probably just set it the once to the top of the CAT40 endmill holder for this exercise.
I suspect that I might have to put the holder in my cylindrical grinder and touch it up a bit to get a good repeatable surface for the VDI40 to rest on, as this is a used holder that probably has the odd bruise on it. . . time will tell when it arrives :scratch:
awemawson:
So bang on cue a delivery driver has just delivered the CAT40 to 40 mm side lock adaptor.
Its in pretty fair condition, but as expected there is a bit of bruising to the upper (in this application) face - it amounts to a total deviation of about 1.5 thou.
I was thinking of touching it up with the J&S 1300 EUIR cylindrical grinder but then, realising it's not the easiest thing to set up to run true it dawned on me, all I need do is mount it in the spindle of the Beaver Partsmaster, clamp a tipped lathe tool in the vice and take a very light skim across it's face.
But that's a job for later - due in the local hospital after lunch - supposedly soluble stitches put in my blind eye over thirty years ago have surfaced and I have a 10 mm dangly bit :bugeye: I reckon that the surgeon picked up the wrong reel of cotton :bang:
Putting the adaptor into the Toolset and making a tentative measurement was delightfully easy - definitely the right decision rather than struggle with ad-hoc piles of 1-2-3 blocks and a height gauge on the surface plate :clap:
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