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Looks like some software has been posted at https://github.com/themuck/ZyklenAutomatik You will have to parse out the german commentary to determine relevance to the OP.

Minor quibble: variac 500VA rating is at 130Vac, ie a 4-4.5 amp draw
from the full autoformer. That suggests the wire winding is so rated,
so one would not want to greatly exceed this current...

Motors look like brushed DC with attached encoders.
The two buttons on the ends with screw driver slots
look like brush holders.

[A question that I do have is: while standing in front of the machine, it seems to give a better finish while milling towards me instead of away from me. Is there any tricks/ suggestions on how to...

Might be a good idea to check the current draw, as your variac is supplying
that current from18-20% of its windings which might produce some local
overheating of the variac winding. It would have...

My interpolation is that you want the 4th axis to function in a lathe
like fashion, ie rotating longish stock, but under the router with
the router doing the cutting. This suggests rpm in the 5 to...

The 115V input VFD appear to be the basic VFD, not the newer sensorless
VFD which punch up the output at lower frequencies so as to maintain
the motor torque. The addition of the braking resistor...

Treadmill motor with SCR drive will be fed chopped 60cycle AC, and
will not work very well at motor speeds below perhaps 600-1000rpm
because lower speeds will be seeing severely chopped 60 cycle...

Looks like they are either give aways for $10-50 or high priced such as the $3k
mentioned by Al. Apparently the first # is the voltage, the second # the rated amps
so STM 24-21 would be 24VDC at...

I think the golf cart charger, suitably packaged would be acceptable,
depending on the amperes expected of the supply. Any DC supply
consisting of xformer, diodes and capacitor will drop the...

Probably worth most as a trade in for a newer machine, if Shoptask still does
that, haven't looked at their website in sometime. Shoptask has considerably
upgraded the machine since the 1720. ...

www.surpluscenter.com has a wide variety of gear drive 24vdc in the $10-20
range. website http://ixian.ca/gallery/pwm/pwm.htm
has a write up and simple PWM driver for same. A good bit cheaper...

What rpm are you running the spindle at? Small bits need very high speeds.
For consideration, what sort of results would one get get running a 1" carbide
cutter at 20 rpm?

The 17-32 is an elongation of the basic 17-20 design, to attract the
gunsmithing crowd. It was sporadically offered in the approx '98 to
perhaps '03 or so time frame. Be aware that the absence...

17-20 were supplied with steppers. The original steppers in the '98-01 more or less time frame were under powered, down in the 200-250oz range and the 450oz steppers Dan has are a better match. ...

The mill head is trammed with some difficulty by putting shims between the
the bottom of the quad cage and the lathe spindle housing. The four point
bolting gives you the necessary axes to tram...

#2 is most appropriate for machines under 4-5 tons or so.
http://www.mobil.com/USA-English/Lubes/PDS/GLXXENINDMOMobil_Vactra_Numbered.asp
This is the page on Mobil's website that discusses the
oil...

There was a writeup in Model Engineer's Workshop early '06 issue at the end of a series of articles on CNC install on a small mill drill and they had a few
paragraphs with pix and ckt for a pendant...

1990's era 17-20 typically had the 4J thrown in with the machine,
so that would be the simplest method. OTOH rusty pitted shaft
clamped in 4J might be damaged by the 4J jaws or be clamped
'off...

To elaborate on Al's reply: the primary of a 110v 1kva transformer will have wire and core rated at 9-10amps conservatively and the 220v secondary will have wire rated for 4.5-5amps. You can't...

In principle a VFD would work off DC, assuming a bridge rectifier as the input circuit and no transformers, which judging from their weight is unlikely but can't rule out a control voltage...

PWM (pulse width modulator) controllers are better than SCR/60hz controllers at least in the lower speed range as the SCR controllers are working at on either 30 or 60 herz pulses depending on...

http://www15.brinkster.com/candgresearch/
Select the item "Z spindle" on the left hand side of the page. The 1220xl is pretty close to the Shoptask 17-20 this mod was originally designed forand...

If you look at an end mill there is a cutout in the shank. EMH have setscrews that screw into that recess and clamp the end mill in place. The endmill should be pulled down so the setscrew is...

The dove tail has a moveable part like a gib on the toolpost, it goes up and down as you turn the handle on the tool post and as the gib like part is on an angle, it moves outward and expands to lock...

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If you think about it you really don't need a full set of MT3 collets. The 1/8
and 1/4 inch, if used as tool (end mill) holders, require speeds that the machine really doesn't feel comfortable or...