What I meant is use a tap as a thread gauge. In this case any tap with a 1 mm pitch. I believe thread form and depth should be the same, no matter the diameter. It could be used to verify your measurements with the play-doh.I doubt such a tap exists, or at least isn't readily available. The threads are about 45mm diameter, maybe 1mm pitch or so.
I like the light. Does it really light the work? I find led's to not light as well, don't know why whether it's the color, the soft look. Many are actually flashing at a very high rate of frequency. When I would take my high powered flashlight out to walk the dog and make sure there were no deer, or fox, that he would chase I would see the effect against the fog or rain. So maybe that's what I am seeing as not as sharp as incandescent.Had a few slitting saws that I wanted an arbor for, looked online and really didn't care for what was available and the $ of some of the better arbors. Since I had standardized on 1" hole for the arbor, I didn't need one with an adjustable hole, nor needed multiple arbors. Spent the day and turned some 1.5" oil rod and was able to get very minimal runout. I use the same wrench as I use on the QCTP to hold the arbor and it locks with a 5/16" Allen bolt with a spring lock washer. Nice to make some chips on this project.
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There is a wide variation on the light output and color for LEDs, often they have the wrong color spectrum so they appear either too yellow or blue, the latter appears dimmer. I often use a combination of LEDs to prevent shadows, and also for the color balance. I use a light bar and then a focused light source on the work, light color is usually something in the 3200-4000K which is considered Daylight spectrum. The combination of the LED light bar and halo ring is about equivalent to 150-200W with halogen bulbs, but without the heat. Everything runs off of DC, have not had any issues with flicker. I often use Philips daylight LED MR16 bulbs which have higher lumen output and the light bar is an industrial one made by Waldman, make a very big difference in the quality of the light.I like the light. Does it really light the work?