Video

Thanks for your kind feedback. Actually, I don't think that my video really explains the functionality. (I am planning to do a series on the facing and boring head since a long time though.) You can still buy the Wohlhaupter heads new, e.g. look for "Rabensteiner Universal Plan- und Ausdrehköpfe". The heads are frequently offered second hand on the usual well known auction platforms.

Hallo, ja, ich bin zufrieden mit der Säge. Die Frage kann ich leider nicht beantworten, da ich bisher keine Schrägschnitte durchgeführt habe. Tut mir leid.

Danke für den freundlichen und motivierenden Kommentar! Mit der Bildqualität bin ich - ehrlich gesagt - nicht ganz zufrieden. Das war wirklich herausfordernd, weil ich mit einem Balgengerät und Vergrößerungsobjektiv gearbeitet habe. Aber, ja, "coole show" scheint die Masse heutzutage zu brauchen - ich brauche das nicht.

Glückwunsch zur Emco. Das ist eine gute Maschine. Man muss lernen, mit ihren kleinen Macken zu leben. (überteuerter und zu schwacher Keilriemen, schwacher Oberschlitten). Bau Dir einen festen Oberschlitten! Das bringt sehr viel Stabilität!

@@HaraldFinster Jup, kenne das von der kleinen Proxxon (die sind ja alle mehr oder weniger EMCO Klones) ...hab mir da auch für's Längsdrehen einen soliden plangeschliffenen Stahlblock draufgeschraubt, das hat viel gebracht. ...hab natürlich auch schon Dein Video vom Compound angsehen...danke...sehr Hilfreich!! 😃👍

Hi! Thanks for your comment. Please contact me via hfinster@gmx.de for a manual. Do the "regular" (non fast forward) feeds work? Are you sure that you mean y and z? The auto feed of the y axis works mostly independent from the x and z feeds. That's why I am asking. If the x and z feeds don't work: there is a cardan joint underneath the gear boxes which drives the gear which in turn drives the lead screw of the z-axis and the shaft powering the x-feed. The cardan is connected to the drive shaft with a shear pin which might be broken. Just a guess. Feel free to contact me via the mail address given above.

Bei der ersten Spindel hatte ich die Freistiche an den Enden vergessen. Dadurch passte der Gewindestahl nicht zwischen Drehkörner und Gewindeansatz. Ich habe dann den schlankeren Rollkörner der Emco verwendet, der aber ziemlich blöd gelagert und nicht sonderlich steif ist. Bei den outtakes sieht man das ganz gut. Da hatte ich allerdings beim Zurückfahren des Planschlittens auf Null eine Umdrehung zu viel gemacht und deshalb 1.5 mm zu viel zugestellt. Ausserdem waren die Gewindegänge ziemlich rau mit kleinen Ausbrüchen. Ich hatte ETG100 verwendet, das sich eigentlich sehr gut verarbeiten lässt, aber vermutlich war die Schnittgeschwindigkeit zu gering. Im zweiten Versuch war's dann Silberstahl (1.2210 / 115CrV3) - auch nicht das optimale Material, aber ich hatte nichts Passenderes am Lager. Mit viel Öl, höherer Drehzahl und winzigen Zustellungen wurde das Gewinde sehr schön.

The German version was on special request of a friend :-) and there is a quite large German speaking community ("zerspanungsbude")

@@bobweiram6321 I’m grateful he does an English version, my German is dreadful, mercifully most technologists in Germany have at least some German. I once had to do a corrosion lecture in Germany, the lab was packed with factory staff some of whom had less English. The laughter was genuine as we all stumbled to an understanding of the evil nature of the chloride ion!

Thank you. You probably refer to metric vs. imperial: no criticism intended at all. People just like to use what they are used to use (3 x "use" :-) ) The size of the base unit doesn't really matter. The main advantage of the metric system is that all derived units are multiples of 10 (e.g. 1 km = 10*10*10 m). Thia makes conversions so easy. In the machining world expressing thread pitches in threads per inch is advantageous in comparison to what is usually used in the metric world (mm per thread revolution): thread dials work much better (no special gears required) with the TPI system. (Of course you could do the same in the metric system, i.e. expressing thread pitches in TPM (threads per meter)).

@@HaraldFinster no,no, I was only joking my friend. By criticism I just meant you can offer critique and it would be a valuable insight that one should see as a good thing. I was not at all trying to offend you or the metric system. I was only kidding. There is nothing wrong with the metric system. It’s an ongoing poking fun back and forth between us that’s all. Sorry to offend you. My machines are both metric and imperial and it often comes with some poking fun at me when I share some of my experiences and operations. This is the first time I’ve seen your content and I was just trying to make a little joke and support your channel by leaving a comment. No ill intentions harbored my dear friend.

@@jasonhull5712 Hi, no worries - I didn't feel offended at all. Thanks for your kind comment. I agree: there isn't anything wrong with either system, meters, inches or bananas (the latter seems to be the favourite measuring unit of my favourite Australien machinist (CEE) 🙂 )

Until now I just tried to adjust the table with the 1/100th mm (1/2 thou) indicator and it was pretty easy to hit the desired value. I used the device in such a way that the table was lifted. Thus gravity helped to keep the mechanism under slight tension/pressure and eliminates and play/backlash in the mechanism.

Thanks for the idea.my first thought,this device represents a lot of care and hard work. My second was how would I do this? My mill has a fixed table, but the head can be rotated and angles set from an enormous protractor scale on the head, but fine adjustment with a strut operated by raising the X would be perfect. Excellent.

Just tried to adjust the table using a digital dial gauge with a 1µm resolution and I am pleased to tell that I was able to adjust the table within plus/minus 1 µm. (about 1/2 ten thousands of an inch)

oh, danke - aus Deinem Mund zählt das Lob für mich mindestens doppelt (rotwerd) 🙂

Danke! Die Videos sind auf Englisch (mit deutschen Untertiteln auf Wunsch), weil ich damit deutlich mehr Leute erreiche. Neuerdings sind die Videos sowohl in deutscher als auch englischer Sprache verfügbar.

Thanks a lot for your comments and good questions. With regards to peck drilling: Honestly, yes, I am aware of the peck drilling technique, but in most cases I am just too lazy and did not develop the habit pd applying it. There isn't any good reason for not doing it. The friction clutch mechanism of my quill's auto feed would make it really easy to use. I will keep it in mind in the future. With regards to the moving center drill: you are probably right: I didn't notice this before watching my video. I have to check this - perhaps with a dial measuring the deflection of the quill. The tailstock alignment should be fine, but I will also recheck this. Thank you for your great contribution.

Well spotted! Honestly - no I didn't notice this. The reason for pre-drilling with the center drill was mostly because I wasn't sure if the chamfer end-mill would be able to "drill" in the very center. I would expect that this should be sufficient to keep the chamfer mill "on track". I am obviously wrong. And - again honestly - I don't have an explanation. I have to investigate this. One possible explanation could be an issue with my y-axis. (On my Thiel the y-movement is NOT done with the table but with the spindle stock.) Thank you very much for pointing this out.

@@HaraldFinster no need thanks, you offering such beautiful job and ideas to everybody...keep the great work my friend.

@@5b4aezmarinoscyprus71 🙂 I just went down into my basement shop and did a few quick checks which confirmed my suspicions that the ways of the y-axix of my mill is adjusted incorrectly. I can move the vertical head sideways (perpendicular to the y-axis) by about 0.05 mm just with the force of my hands. With the axis locked the movement is below 0.01 mm. So, fixing this issue will be my next "project". An other issue is the fact, that I have more than 3 mm "backlash" in the y-axis, i.e. I have to turn the adjustment wheel by a full turn between positive and negative adjustments. Don't know if I will be able to film my repair.

@@HaraldFinster that's a great idea filming the repairs of your milling machine. Just a suggestion, did you ever consider to replace the lead-Screw nut with ball nuts..? The tolerance with this type of nuts is zero...

@@5b4aezmarinoscyprus71 I considered this idea, but it would be a major modification. The backlash isn't a real problem for me, especially as I have a DRO on my machine which avoids the need of "overhooting" and targeting a specific measurement from one direction. I am pretty sure that my "backlash" issue is not caused by excessive wear of the spindle or spindle nut. I must have been drunk when I assembled the machine and probably forgot to tighten some screw properly. We will see...

Thank you very much for your kind comment. Adding info on the speeds and feeds is a good suggestion. I will keep it in mind.

Sure, it would have been possible to get Belleville spring washers. This would have been the "cleaner" solution. I just didn't want to wait for them and - honestly - I wasn't willing to spend 5 (or so) Euros to get 4 washers delivered.

Excellent thoughts and explanation. Thank you very much! I did not think of the trick with the ball bearing but considered using the differential thread trick.

But the differential screw will have to be untied in the middle with a cardan (or other coupling), otherwise everything will jam

@@SergeiPetrov if I understand the original suggestion correctly, the adjustment screw should run in slewable threads. This would solve the problem.

Thank you. "your secret is safe with me" I am relieved ;-)

You're welcome!

Good thought. Yes, I agree (although I am not a CNC machinist).

Yes, you can certainly use this technique for multi-start threads. I am not sure if the precision of the combined cross- compound-slide adjustment is sufficient if you just trust the dials. Alternatively (or in addition) you could use a dial indicator to measure the longitudinal displacement of the tool. Certainly worth a try (and a video :-) )

Thank you. Yes that would certainly speed up the process. But I suppose that the setup would be difficult due to the backlash in the lead screw.

Im Prinzip müsste das funktionieren. Das Ankratzen für die Längsverstellung wird dann allerdings schwierig, weil man wenig sieht. Eventuell könnte man das dann "blind" über die Skala des Oberschlittens machen. Den erforderlichen Verstellweg kann man ja berechnen.

Die passende Räderkombination war in diesem Fall einfach zu finden: bei einer Leitspindelsteigung von 1.5 mm ist für ein 4.5er Gewinde eine Übersetzung von 3:1 erforderlich. Das ging hier so: Ritzel auf der Spindel = 40 Zwischenzahnrad = 80 (irrelevant) auf der Zwischenwelle 40 - 75 auf der Leitspindel : 25 Zur Ermittlung von Wechselradkombinationen für "exotischere" Gewinde habe ich mir mal ein kleines Script geschrieben. Nein, aus dem Alugewinde kann ich kein Stahlgewinde zaubern ;-) Ich habe die Herstellung des Stahl-Gewindes damals leider nicht gefilmt. Das wäre allerdings noch deutlich langweiliger geworden, als diese Demo in Alu. Man hätte auch wegen der sehr geringen Zustellungen wenig gesehen.

Hallo Chris. Ein guter Gedanke! An lange Gewinde hatte ich gar nicht gedacht. Das selbe Prinzip könnte man beispielsweise bei der Herstellung von Trapezspindeln nutzen.

@@HaraldFinster genau, besonders bei langen Spindeln, die man komplett herstellen muss, weil ein grösserer Absatz o.ä. vorhanden ist (im Gegensatz zu kleineren Enden wo man evtl eine vorgefertigte Trapezgewindestange nur bearbeitet). Wirklich gut sowas im Hinterkopf zu haben wenn mans mal braucht 😎

Gern geschehen. Mir ist schon klar, daß diese Methode eher selten benötigt wird. Ich würde sie auch nur im Notfall anwenden, wenn es wirklich nicht anders geht. Bei dem 5.5er Gewinde in Stahl gab es auf der Emco keine Wahl. Das hier zu Demo-Zwecken geschnittene Gewinde in Alu hätte die Emco vielleicht sogar noch geschafft.

thanks for your suggestion - however, I am not sure, if I understand you correctly. I am aware that turning an outer and inner cone with identical compound slide setting leads to matching cones -at least as long as the headstock is aligned correctly and the tool is on center height. In my case I did not machine the cone of the spindle nose. It was given by the manufacturer of the spindle. Thus I had to sweep it with the indicator to set up the compound slide. I turned the OD of the initial "reference cone" with this setting and used this cone to check for the correct cone angle using the inner cone of the flange. (Which came with the spindle and matches the spindle nose.) The ID of the pulley was turned with the same compound slide angle - as you suggest. Edit: sorry - I got your point: you are referring to the 1° double cone of the pulley crown. Yes, you are right, that would have been possible. Thanks.