Measuring small tool tip (e.g. threading tool)

[timo_gross]

I wondered how to measure this tiny tip of a threading tool right. e.g. when making something with the button style method.

Side comment!
I found a video of a tool that looked promising yesterday, today searching it again "gizmo measuring threading tool end width" did not produce anything. Decide for yourself how good Aritificial intelligence in the search works. I am tempted to start making up conspiracy theories at this point.

Anyway, that you can find the thing I post it here, as search seems to bury it under advertisements.



Question: Does anyone have other tips how to measure this kind of pointy features? Also specially, when you for example want to measure during machining and cannot take it out of the fixture.

 

[djc]

Use a piece of 1mm squared graph paper as a background and take a very good, square-on photograph of it zoomed well in with your phone. You will need a holder for the phone and possibly a remote or timed shutter release (hand-held will not do). For in-place photography on a machine, a mag base indicator holder might assist.

If you know the shank size, you might not need the graph paper, just a plain background, as you can calibrate from a known measurement.

Many toolroom measurements in the past used optical methods; this is just bringing them into the 21st century.

 

[timo_gross]

Use a piece of 1mm squared graph paper as a background and take a very good, square-on photograph of it zoomed well in with your phone. You will need a holder for the phone and possibly a remote or timed shutter release (hand-held will not do). For in-place photography on a machine, a mag base indicator holder might assist.

If you know the shank size, you might not need the graph paper, just a plain background, as you can calibrate from a known measurement.

Many toolroom measurements in the past used optical methods; this is just bringing them into the 21st century.

I see where this is going and it makes sense. I was thinking for measuring a disc cutter from the side taking a photo might become difficult. After first experiments, I realized that measuring the tip is probably my least problem .
I realized that I do not need to measure the tool. A small test piece combined with the proposed photo will work good enough for what I need. Boxes on this paper are 2.5 mm appart.

Greetings timo

 

[timo_gross]

Small gear rack. Who can spot the indexing mistake? Naturally last pass, :-/ but at least on the end of the rack The indexing was quite tedious. (even with DRO)

 

[clockworkcheval]

A simple method is to put the tool on the glassplate of your copier, include a ruler or a gaugeblock of appropriate dimensions and make a high resolution scan. Magnify the scan electronically and measure.

 

[timo_gross]

A simple method is to put the tool on the glassplate of your copier, include a ruler or a gaugeblock of appropriate dimensions and make a high resolution scan. Magnify the scan electronically and measure.

Yes scanning is similar to the photo method and these proposals give new ideas. The scanner has something like 2400 dpi, I should try to find one of those microscope rulers.

But .... a typical gear cutter is difficult to put perpendicular on a copy machine The angled tip makes it difficult to use a standard micrometer.

Indirect by making a notch and scan it works for the grinding wheel. For a lathe project. e.g. gear cutter blank, maybe I can use some soft material to make the indent (wax?) and then measure that?