Deckel GK 21 Pantograph Engraving and Profiling Miller

s/n 6,703

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1. Introduction

Universal Gravier-und-Nachformfrasmaschine GK 21.

Acquired 2010-06-24. Serial number 6,703. Probably 1960s vintage.

It just followed me home one day. Really. It stayed right behind me for 200 miles. See:

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The only problem, of course, is that when we left home that morning I had no idea of acquiring, much less intention to acquire, a 3-D pantograph. The trip was supposed to be one to get the Gorton 375-4 Cutter Grinder (the smaller beige machine in the photo above). True, I had recently mused that it might be cool someday to have a 3-D pantograph. "Be careful what you wish for - you may get it!" :-)

Of course, an engraving machine requires cutters, so see ../../../ Machine Shop -> Cutting Tool Forming and Sharpening Notebook, and more particularly, within that, Gorton Cutter Grinding Machines (the treatment of cutter grinding by Gorton is better than that in the Deckel manual).

See also the Notebook on the Gorton 375-4 Cutter Grinder, s/n 103,789, at CircuitousRoot.

Because pantograph engravers are so often used as lettering machines, and because I first acquired mine for the (related, but distinct) purpose of making matrices for typefounding, I put the pantograph literature reprint section in ../../../ Typefounding, Lettering, & Printing. So for general technical literature on pantograph engraving machines (including a lot on Gortons, but nothing yet on Deckels) see Pantograph Engraving Machines, and especially the Gorton Pantograph Engraving Machines Notebook.

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2. Identification


3. Power

Naturally, it's 440V 3-phase. Sigh.

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0.440 kW is just under 0.6 hp (0.59) 0.660 kW is just under 0.9 hp (0.89).

What's interesting is that the 1966 manual for the GK 12 / 21 (document No. 3210e) calls out a 1400/2800 R.P.M. motor at 0.34 / 0.4 kW (= 0.46 / 0.54 hp).

So, simplifying, it looks as if I've either got to figure out how to generate 440V 3-phase (my existing phase converter does only 208V 3-phase) or remotor it with a 1/2 hp single phase motor.

4. Rigging


5. Collets

5.1. Spindle Collets

The GK 21 spindle collet is a Deckel proprietary spring collet which uses a non-locking taper and a nut to push the collet into the taper. The "nose" of the collet sticks through the nut and its flat end is flush with the end of the nut. There is a neat arrangement of a flat on two sides of this "nose" and a corresponding form on the nut which allows the collet and nut to be loosely (but securely) held together as a unit for ease in putting it into the spindle.

For specifications, see ../../ Collets -> System Deckel Collets.

Measurement of the collets with this GK 21 show that it takes the System Deckel collet which has an overall length of 24 mm, a maximum diameter of 17.5 mm, and a taper (half) angle of 10 degrees. These have a maximum hole diameter of 8 mm. Such a collet is Simon Nann Gmbh&Co. KG article no. 405 E. I don't presently know the actual Deckel designation for this size collet.

5.2. Tracer Collets


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