Vernac Simpson measuring system mill bed Mod A-5600, 3900 machinist lathe, US $175.00 – Picture 0

Vernac Simpson measuring system mill bed Mod A-5600, 3900 machinist lathe, US $175.00 – Picture 1

Vernac Simpson measuring system mill bed Mod A-5600, 3900 machinist lathe, US $175.00 – Picture 2

Vernac Simpson measuring system mill bed Mod A-5600, 3900 machinist lathe, US $175.00 – Picture 3

Vernac Simpson measuring system mill bed Mod A-5600, 3900 machinist lathe, US $175.00 – Picture 4

Vernac Simpson measuring system mill bed Mod A-5600, 3900 machinist lathe, US $175.00 – Picture 5

Vernac Simpson measuring system mill bed Mod A-5600, 3900 machinist lathe, US $175.00 – Picture 6

Vernac Simpson Measuring System Mill Bed Mod A-5600, 3900 Machinist Lathe

US $175.00

San Juan Bautista, California, United States
Jan 30th

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Vernac measuring system used for mill od A-5600, 3900 . I gathered data on this system from the web and a machinist web site. I have tested the 110Vac lighted heads and they both work and there is also extra bulbs included. Data I retrieved from the web with help from some BB machinist: The Vernac head is marked Mod A-5600, Infrared Industries, Inc., Santa Barbara, CA Linear stage is packed in a large plywood box with three mounting points, a finely finished test bar and a very accurately made scale bar 24 1/2" long. This whole kit is very beautifully made and must have been very accurate for the time when it was made as it reads directly to .0001. The Vernac is a direct reading optical measuring instrument for indicating longitudinal or transverse position of the table of the Tree milling machine. Readings from the precision scale affixed to the machine table are transmitted through a 22-power lens systmem and projected onto a illuminated direct reading dial. Readings are in .025 intervals. Fine adjustment of the direct reading dial, by means of a double spiral reticle, provides a further measurement refinement on the order of .0001 Vernac scales are etched into mirror-polished stainless, and they are read using a projection microscope. The scales are graduated in 0.025 inch increments, with every graduation line numbered. The reading microscope projects light onto the scale, which reflects from the polished portion of the scale surface but not from the etched graduations and numbers. The image of the graduations and numbers is projected onto a small screen on the readhead; depending on the position of the readhead relative to the scale graduations, there will be one or two sets of graduations and numbers visible in the window. There is a circular glass mask over the readhead window that can be rotated by gripping and turning the mask's bezel. The mask carries a bifilar spiral reticle and graduations representing 0.025 inch subdivided into 0.0001 inch increments at its rim. Turning the mask causes the portion of the bifilar over the main scale projection window to appear to move sideways (horizontal) or up/down (vertical), and the idea is to center the image of the main scale graduation between the paired lines of the spiral reticle before reading the rim-of-mask graduation at a fixed-to-the-case index mark.The system is very accurate, I believe that the main scale graduations are within 0.0001 inch of their theoretical locations over the length of the scale, BUT the adjustment of the readhead relative to the scale is vitally important and a PITA to adjust. The readhead must be located and rotated in the plane of the main scale so that the magnified image is projected into and aligned with the window, and then the readhead must be moved toward or away from the scale so that two adjacent main scale graduations are 0.0250 inch apart on the readhead's scale. In other words, the bifilar spiral should center one main scale graduation when the readhead scale is at 0.0000 inch AND the next-lower mainscale graduation when the readhead scale reads 0.0250 inch. Incidentally, the factory used PR-12 lamps (commonly called a "6 volt lantern bulb") as a light source. The PR-12 is wobbly-loose in the lamp socket, so it SEEMS very wrong, but it is correct; the lamp flange is big enough to keep the lamp from falling into the readhead and the socket manages to get power to the filament. Also including a level for a lathe or mill, sold as pictured. If you are looking at this advertisement you are likely a machinist and know what you are looking at and what these are, far better than I. I am not a machinist and will be taxed to speak intelligently to these items and all of the other machinist tools I am selling. I knowingly admit my lack of knowledge on machinist tools. I very much appreciate your looking at this advertisement and ask if you are seriously interested, please send genuine questions you may have. Please do not ask me to separate the tools in this auction out as I want to sell as one lot of similar tooling together. I will do my best to answer any questions sincerely and in the best timely means I can but I do have a weekday job that keeps me on the go Shipping and packaging are the buyers responsibility. Please be advised ebay shipping prices are guidelines, not guaranteed rates and I have found them to be in error ( I think for a fact they are on this listing when I see similar items with higher freight prices) frequently with respect to fed-Ex rates. I will provide you an email with shipping once I receive your zipcode. Please do not pay shipping per email as it could be inadequate. Should you buy more than one of my classes of parts, I will do my best to ship items together to save buyer on shipping fees. Should you wish to pick-up tools locally, I will do my best to accommodate you within what my work schedule allows.

Condition:	Used: An item that has been used previously. The item may have some signs of cosmetic wear, but is fully operational and functions as intended. This item may be a floor model or store return that has been used. See the seller’s listing for full details and description of any imperfections. ...	Brand	Unbranded/Generic
Country/Region of Manufacture	Unknown
Model	T&O