Member postings for Michael Gilligan

David,

It's good to see the relevant numbers; thank you.

I suspect that Wolfie would be very happy if he could set his machine to +/- a tenth of a thou over eight inches.

MichaelG.

Harold,

A very interesting analysis ... with much food for thought.

I am intrigued by the suggestion of deliberately misaligning the head:

Effectively this is a work-around for the many forms of backlash and flexure in the system. But presumably this would also require one to always cut in one direction ?

Grateful for your further comment on this point.

MichaelG.

... Just like the ploughed field that Wolfie mentioned in his original post !!

MichaelG.

It's been fun chasing that Red Herring

... and we've learned about another interesting lathe.

MichaelG.

P.S. There is some discussion about a Barnes lathe with an extending bed,

on Practical Machinist

Edited By Michael Gilligan on 31/07/2012 10:12:21

Neil,

I'm guessing here; but it seems likely that he meant "extends" by the use of Raising Blocks.

The Schaublin set is pictured here, along with some other "objects of desire" ... like that double tee slotted Angle Plate!

MichaelG.

Not exactly the same model, but here is another Habegger.

MichaelG.

Most likely ... the head is not exactly perpendicular to the table.

Time for some careful "tramming" to see what you have.

MichaelG.

Ah ... I see the problem !

It's Habegger, not Halbegger.

MichaelG.

David: May I suggest that you edit the thread title?

Edited By Michael Gilligan on 30/07/2012 13:23:45

Nicely done, Ian

A splendid mix of old and new !

MichaelG.

Pardon my ignorance ... but what prompted this thread ?

I have searched the site, for Halbegger, and this is the only reference!

MichaelG.

If it's important that the hole is on the centre-line, then what I suggested earlier is worth doing.

... spot the location with a slot-drill or a 3-flute cutter, before you commit to drilling.

This gives you one last chance to get the centering right, and it presents a flat surface to the drill.

... it only takes a little longer.

MichaelG.

Presuming that you want to cross-drill for a pin ...

Best bet is to find, or make, the matching female taper and use that as a jig.

Failing that ... set it up very carefully in the Mill, and use a Slot-Drill to spot a nice flat face before you try drilling.

MichaelG.

Edited By Michael Gilligan on 21/07/2012 08:52:15

Kevin,

Pricey little blighters aren't they!

But ...

if ever there was a place you need top quality, and good fit, a toolholder must be it.

MichaelG.

Edited By Michael Gilligan on 21/07/2012 08:43:50

Wolfie,

As Terryd indicates ... flat belts should not be run tight

It is essential that the belt can "ride up" onto the crown of the pulley, which [maybe counter-intuitively] it will do if the pulleys are aligned.

Terry mentions the old line-shafting ... Over each machine there were two pulleys: one was "Fast" [i.e. fastened, or fixed] to the line-shaft, and the other was "Loose" upon it ... the belt was moved from one to t'other as a local on/off for that machine.

As you have probably deduced; his is the origin of the expression "Playing Fast and Loose"

MichaelG.

This is worth reading

Edited By Michael Gilligan on 21/07/2012 08:26:37

David,

Many thanks for the offer, but I doubt that you need to combine the threads.

I just happened to note the similarity, and though it worth inserting a reference.

MichaelG.

Edited By Michael Gilligan on 19/07/2012 09:38:59

May I thank you gentlemen for posting

I just happened across this thread, and have learned a lot.

... That old Model Steam Turbines book is fascinating, and your expert comments bring things nicely up to date.

Anyone interested in Dynamometers might find it useful to look at Magtrol.

[they generously provide PDFs of their Manuals]

MichaelG.

Edited By Michael Gilligan on 19/07/2012 08:31:40

Inevitable I suppose ... but it's unfortunate that this thread and another recent one have not been cross-referenced in some way.

May I encourage everyone to do what I have just done; embed references to threads containing "prior knowledge".

MichaelG.

Terry,

Thanks for the note; but please be aware that David fixed that particular problem.

Obviously the right thing to do ... but it does mean that we are "chasing a moving target".

MichaelG.

David's post of 23:08:18 on 17-July, refers.

Edited By Michael Gilligan on 19/07/2012 07:40:10

Thanks for your continuing patience, David.

If 590px is the correct width, then I concede; that cannot be be problem.

BUT it was obviously something within that snippet of html, copied from the other thread, that upset this page.

MichaelG.

Tomfilery,

If the behaviour of these pages was consistent across all browsers, then the solution would be as simple as you suggest.

Unfortunately; as you will see from reading previous threads, it is not.

Somewhere [I know not where] there is a "browser compatibility" problem within the Source Code.

MichaelG.